首页 > 最新文献

Frontiers of Earth Science最新文献

英文 中文
Understanding and improving Yangtze River Basin summer precipitation prediction using an optimal multi-Physics ensemble 利用最优多物理场集合理解和改进长江流域夏季降水预测
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-03-23 DOI: 10.1007/s11707-024-1118-x
Yang Zhao, Fengxue Qiao, Xin-Zhong Liang, Jinhua Yu

This study employs the regional Climate-Weather Research and Forecasting model (CWRF) to first investigate the primary physical mechanisms causing biases in simulating summer precipitation over the Yangtze River Basin (YRB), and then enhance its predictive ability through an optimal multi-physics ensemble approach. The CWRF 30-km simulations in China are compared among 28 combinations of varying physics parameterizations during 1980–2015. Long-term average summer biases in YRB precipitation are remotely correlated with those of large-scale circulations. These teleconnections of biases are highly consistent with the observed correlation patterns between interannual variations of precipitation and circulations, despite minor shifts in their primary action centers. Increased YRB precipitation aligns with a southward shifted East Asian westerly jet, an intensified low-level southerly flow south of YRB, and a south-eastward shifted South Asian high, alongside higher moisture availability over YRB. Conversely, decreased YRB precipitation corresponds to an opposite circulation pattern. The CWRF control configuration using the ensemble cumulus parameterization (ECP), compared to other cumulus schemes, best captures the observed YRB precipitation characteristics and associated circulation patterns. Coupling ECP with the Morrison or Morrison-aerosol microphysics and the CCCMA or CAML radiation schemes enhances the overall CWRF skills. Compared to the control CWRF, the ensemble average of these skill-enhanced physics configurations more accurately reproduces YRB summer precipitation’s spatial distributions, interannual anomalies, and associated circulation patterns. The Bayesian Joint Probability calibration to these configurations improves the ensemble’s spatial distributions but compromises its interannual anomalies and teleconnection patterns. Our findings highlight substantial potential for refining the representation of climate system physics to improve YRB precipitation prediction. This is notably achieved by realistically coupling cumulus, microphysics, and radiation processes to accurately capture circulation teleconnections. Further enhancements can be achieved by optimizing the multi-physics ensemble among skill-enhanced configurations.

本研究利用区域气候-天气研究和预报模式(CWRF),首先研究造成长江流域夏季降水模拟偏差的主要物理机制,然后通过优化多物理参数组合方法提高其预测能力。比较了 1980-2015 年间 28 种不同物理参数组合在中国的 CWRF 30 公里模拟结果。结果表明,YRB夏季降水的长期平均偏差与大尺度环流的偏差存在遥相关性。这些偏差的远程联系与观测到的降水量年际变化和环流之间的相关模式高度一致,尽管它们的主要作用中心略有偏移。长三角降水量的增加与东亚西风气流南移、长三角以南低层偏南气流增强、南亚高纬度东移以及长三角上空水汽供应增加有关。相反,YRB 降水量的减少与相反的环流模式相对应。与其他积云方案相比,使用集合积云参数化(ECP)的 CWRF 控制配置最能捕捉到观测到的 YRB 降水特征和相关环流模式。将 ECP 与莫里森或莫里森-气溶胶微物理和 CCCMA 或 CAML 辐射方案耦合,可提高 CWRF 的整体技能。与对照 CWRF 相比,这些技能增强型物理配置的集合平均值更准确地再现了 YRB 夏季降水的空间分布、年际异常和相关环流模式。对这些配置进行贝叶斯联合概率校准可改善集合的空间分布,但会影响其年际异常和远缘模式。我们的研究结果凸显了完善气候系统物理表示以改进 YRB 降水预测的巨大潜力。这主要是通过将积云、微观物理和辐射过程真实地耦合起来,以准确捕捉环流远缘联系来实现的。通过在技能增强配置中优化多物理场集合,可以进一步提高预测效果。
{"title":"Understanding and improving Yangtze River Basin summer precipitation prediction using an optimal multi-Physics ensemble","authors":"Yang Zhao, Fengxue Qiao, Xin-Zhong Liang, Jinhua Yu","doi":"10.1007/s11707-024-1118-x","DOIUrl":"https://doi.org/10.1007/s11707-024-1118-x","url":null,"abstract":"<p>This study employs the regional Climate-Weather Research and Forecasting model (CWRF) to first investigate the primary physical mechanisms causing biases in simulating summer precipitation over the Yangtze River Basin (YRB), and then enhance its predictive ability through an optimal multi-physics ensemble approach. The CWRF 30-km simulations in China are compared among 28 combinations of varying physics parameterizations during 1980–2015. Long-term average summer biases in YRB precipitation are remotely correlated with those of large-scale circulations. These teleconnections of biases are highly consistent with the observed correlation patterns between interannual variations of precipitation and circulations, despite minor shifts in their primary action centers. Increased YRB precipitation aligns with a southward shifted East Asian westerly jet, an intensified low-level southerly flow south of YRB, and a south-eastward shifted South Asian high, alongside higher moisture availability over YRB. Conversely, decreased YRB precipitation corresponds to an opposite circulation pattern. The CWRF control configuration using the ensemble cumulus parameterization (ECP), compared to other cumulus schemes, best captures the observed YRB precipitation characteristics and associated circulation patterns. Coupling ECP with the Morrison or Morrison-aerosol microphysics and the CCCMA or CAML radiation schemes enhances the overall CWRF skills. Compared to the control CWRF, the ensemble average of these skill-enhanced physics configurations more accurately reproduces YRB summer precipitation’s spatial distributions, interannual anomalies, and associated circulation patterns. The Bayesian Joint Probability calibration to these configurations improves the ensemble’s spatial distributions but compromises its interannual anomalies and teleconnection patterns. Our findings highlight substantial potential for refining the representation of climate system physics to improve YRB precipitation prediction. This is notably achieved by realistically coupling cumulus, microphysics, and radiation processes to accurately capture circulation teleconnections. Further enhancements can be achieved by optimizing the multi-physics ensemble among skill-enhanced configurations.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"31 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140204528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Geochemical characteristics, generation, and evolution mechanism of coalbed methane in the south-western Ordos Basin, China 中国鄂尔多斯盆地西南部煤层气的地球化学特征、生成和演化机理
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-03-08 DOI: 10.1007/s11707-022-1057-3
Yabing Lin, Yong Qin, Dongmin Ma, Shengquan Wang

The south-western Ordos Basin is rich in low-middle rank coalbed methane (CBM) resources; while the geochemical characteristics and genetic mechanism of CBM are not clear. Herein, according to geological and geochemical test data from gas and coal seam water from CBM wells in Bingchang, Jiaoxun, Huangling, Yonglong, and Longdong minging areas, we systematically studied the geochemical characteristics, generation, and evolution mechanism of CBM in Jurassic Yan’an Formation in the south-western Ordos Basin. The results show that the CH4 content of whole gas is in the range of 42.01 %–94.72%. The distribution ranges of the δ13C-CH4 value is −87.2‰ to −32.5‰, indicating diverse sources of thermogenic gas and biogenic gas. The microbial methane is mainly generated by a CO2 reduction pathway, with certain methyl-type fermentation spots. The δ13C-CH4 has a positive correlation with burial depth, indicating the obvious fractionation of CBM. The relationship between the genetic types and burial depth of the CBM reservoir indicates that the favorable depth of secondary biogenic gas is less than 660 m. The Late Cretaceous Yanshanian Movement led to the uplift of the Ordos Basin, and a large amount of thermogenic gas escaped from the edge of the basin. Since the Paleogene Period, the coal reservoir in the basin margin has received recharge from atmospheric precipitation, which is favorable for the formation of secondary biogenic methane. The deep area, generally under 1000 m, mainly contains residual thermogenic gas. The intermediate transition zone is mixed gas. Constrained by the tectonic background, the genetic types of CBM in different mining areas are controlled by the coupling of burial depth, coal rank, and hydrogeological conditions. The Binchang mining area contains biogenic gas, and the development of CBM has achieved initial success, indicating that similar blocks with biogenic gas formation conditions is key to the efficient development of CBM. The research results provide a scientific basis for searching for favorable exploration areas of CBM in the southwestern Ordos Basin.

鄂尔多斯盆地西南部中低层煤层气资源丰富,但煤层气的地球化学特征和成因机制尚不清楚。本文根据鄂尔多斯盆地西南部兵场、蛟勋、黄陵、永隆、龙洞明区煤层气井气和煤层水的地质地球化学测试资料,系统研究了鄂尔多斯盆地西南部侏罗系延安地层煤层气的地球化学特征、生成和演化机理。结果表明,整个气体中 CH4 含量在 42.01%-94.72% 之间。δ13C-CH4值的分布范围为-87.2‰至-32.5‰,表明热生气和生物气来源多样。微生物甲烷主要是通过二氧化碳还原途径产生的,也有一定的甲基型发酵点。δ13C-CH4与埋藏深度呈正相关,表明煤层气分馏明显。煤层气储层的成因类型与埋藏深度的关系表明,次生生物气的有利埋藏深度小于 660 米。晚白垩世燕山运动导致鄂尔多斯盆地隆起,大量热成因气体从盆地边缘逸出。自古近纪以来,盆地边缘的煤储层得到大气降水的补给,有利于次生生物甲烷的形成。深部区域一般在 1000 米以下,主要含有残余热成气。中间过渡带为混合气体。受构造背景的制约,不同矿区煤层气的成因类型受埋藏深度、煤炭等级和水文地质条件的耦合控制。彬长矿区含生物气,煤层气开发取得初步成效,表明具有生物气形成条件的相似区块是煤层气高效开发的关键。研究成果为在鄂尔多斯盆地西南部寻找煤层气有利勘探区提供了科学依据。
{"title":"Geochemical characteristics, generation, and evolution mechanism of coalbed methane in the south-western Ordos Basin, China","authors":"Yabing Lin, Yong Qin, Dongmin Ma, Shengquan Wang","doi":"10.1007/s11707-022-1057-3","DOIUrl":"https://doi.org/10.1007/s11707-022-1057-3","url":null,"abstract":"<p>The south-western Ordos Basin is rich in low-middle rank coalbed methane (CBM) resources; while the geochemical characteristics and genetic mechanism of CBM are not clear. Herein, according to geological and geochemical test data from gas and coal seam water from CBM wells in Bingchang, Jiaoxun, Huangling, Yonglong, and Longdong minging areas, we systematically studied the geochemical characteristics, generation, and evolution mechanism of CBM in Jurassic Yan’an Formation in the south-western Ordos Basin. The results show that the CH<sub>4</sub> content of whole gas is in the range of 42.01 %–94.72%. The distribution ranges of the δ<sup>13</sup>C-CH<sub>4</sub> value is −87.2‰ to −32.5‰, indicating diverse sources of thermogenic gas and biogenic gas. The microbial methane is mainly generated by a CO<sub>2</sub> reduction pathway, with certain methyl-type fermentation spots. The δ<sup>13</sup>C-CH<sub>4</sub> has a positive correlation with burial depth, indicating the obvious fractionation of CBM. The relationship between the genetic types and burial depth of the CBM reservoir indicates that the favorable depth of secondary biogenic gas is less than 660 m. The Late Cretaceous Yanshanian Movement led to the uplift of the Ordos Basin, and a large amount of thermogenic gas escaped from the edge of the basin. Since the Paleogene Period, the coal reservoir in the basin margin has received recharge from atmospheric precipitation, which is favorable for the formation of secondary biogenic methane. The deep area, generally under 1000 m, mainly contains residual thermogenic gas. The intermediate transition zone is mixed gas. Constrained by the tectonic background, the genetic types of CBM in different mining areas are controlled by the coupling of burial depth, coal rank, and hydrogeological conditions. The Binchang mining area contains biogenic gas, and the development of CBM has achieved initial success, indicating that similar blocks with biogenic gas formation conditions is key to the efficient development of CBM. The research results provide a scientific basis for searching for favorable exploration areas of CBM in the southwestern Ordos Basin.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"102 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140073673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Low-latitude hydroclimate changes related to paleomagnetic variations during the Holocene in coastal southern China 全新世中国南方沿海地区与古地磁变化有关的低纬度水文气候变迁
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-02-29 DOI: 10.1007/s11707-022-1009-y
Tingwei Zhang, Xiaoqiang Yang, Jian Yin, Qiong Chen, Jianfang Hu, Lu Wang, Mengshan Ju, Qiangqiang Wang

The variations in precipitation have displayed a complex pattern in different regions since the mid-to-late-Holocene. Cloud formation processes may have a significant impact on precipitation, especially during the tropical marine processes and summer monsoon which convey abundant water vapor to coastal southern China and inland areas. Here, we use two 7500 year sedimentary records from the Pearl River Delta and the closed Maar Lake, respectively, in coastal southern China to reconstruct the mid-to-late-Holocene humidity variability and explore its possible relationship with cloud cover modulated by the Earth’s magnetic fields (EMF). Our proxy records document an apparent increase in wetness in coastal southern China between 3.0 and 1.8 kyr BP. This apparent increase in humidity appears to be consistent with the lower virtual axial dipole moments and, in turn, with a lower EMF. This correlation suggests that the EMF might have been superimposed on the weakened monsoon to regulate the mid-to-late-Holocene hydroclimate in coastal southern China through the medium of galactic cosmic rays, aerosols, and cloud cover. However, further investigations are needed to verify this interaction.

自全新世中晚期以来,不同地区降水量的变化呈现出复杂的模式。云的形成过程可能对降水有重要影响,特别是在热带海洋过程和夏季季风期间,向华南沿海和内陆地区输送大量水汽。在此,我们利用分别来自中国南方沿海珠江三角洲和封闭的玛珥湖的两个 7500 年的沉积记录,重建了全新世中期至晚期的湿度变化,并探讨了其与受地球磁场(EMF)调制的云层的可能关系。我们的代用记录表明,在公元前 3.0 千年至公元前 1.8 千年之间,华南沿海的湿度明显增加。湿度的明显增加似乎与较低的虚拟轴向偶极矩以及较低的电磁场相一致。这种相关性表明,电磁场可能叠加在减弱的季风之上,通过银河宇宙射线、气溶胶和云层等介质调节中国南方沿海全新世中晚期的水文气候。然而,要验证这种相互作用还需要进一步的研究。
{"title":"Low-latitude hydroclimate changes related to paleomagnetic variations during the Holocene in coastal southern China","authors":"Tingwei Zhang, Xiaoqiang Yang, Jian Yin, Qiong Chen, Jianfang Hu, Lu Wang, Mengshan Ju, Qiangqiang Wang","doi":"10.1007/s11707-022-1009-y","DOIUrl":"https://doi.org/10.1007/s11707-022-1009-y","url":null,"abstract":"<p>The variations in precipitation have displayed a complex pattern in different regions since the mid-to-late-Holocene. Cloud formation processes may have a significant impact on precipitation, especially during the tropical marine processes and summer monsoon which convey abundant water vapor to coastal southern China and inland areas. Here, we use two 7500 year sedimentary records from the Pearl River Delta and the closed Maar Lake, respectively, in coastal southern China to reconstruct the mid-to-late-Holocene humidity variability and explore its possible relationship with cloud cover modulated by the Earth’s magnetic fields (EMF). Our proxy records document an apparent increase in wetness in coastal southern China between 3.0 and 1.8 kyr BP. This apparent increase in humidity appears to be consistent with the lower virtual axial dipole moments and, in turn, with a lower EMF. This correlation suggests that the EMF might have been superimposed on the weakened monsoon to regulate the mid-to-late-Holocene hydroclimate in coastal southern China through the medium of galactic cosmic rays, aerosols, and cloud cover. However, further investigations are needed to verify this interaction.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"132 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140008398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Changes of tropical cyclone size in three oceanic basins of the northern hemisphere from 2001 to 2021 2001 至 2021 年北半球三个大洋盆地热带气旋规模的变化
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-02-29 DOI: 10.1007/s11707-022-1064-4
Banglin Zhang, Jeremy Cheuk-Hin Leung, Shengyuan Liu, Jianjun Xu

In this study the changes of tropical cyclone (TC) size from 2001 to 2021 are analyzed based on linear and quadratic curve fittings of the National Hurricane Center (NHC) / Joint Typhoon Warning Center (JTWC) best track data, based on the radius of maximum wind (RMW) and the average radius of 34-kt wind (AR34), in three oceanic basins of the North Atlantic (NATL), the Western North Pacific (WPAC) and the Eastern North Pacific (EPAC). The computations are done separately for two categories of tropical cyclones: tropical storms (TS) and hurricanes (HT). Size changes of landfalling and non-landfalling TCs are also discussed. Results show that there is a great inter-basin variability among the changes in TC sizes. Major conclusions include: 1) overall, the inner cores of TSs have become larger in all three basins, with the increasing tendencies being significant in the NATL and WAPC, while those of HTs mostly get smaller or remain similar; 2) meanwhile, comparatively large inter-basin differences are observed for the TC outer core sizes, and the sizes of landfalling TCs; 3) particularly, a significant decrease in landfalling HT outer core size is observed over the EPAC; 4) in contrast, significant increases in landfalling TS inner core size are found over the NATL and WPAC. The presented analysis results could benefit future research about TC forecasts, storm surge studies, and the cyclone climate and its changes.

本研究根据美国国家飓风中心(NHC)/台风联合警报中心(JTWC)的最佳路径数据,按照北大西洋(NATL)、北太平洋西部(WPAC)和北太平洋东部(EPAC)三个大洋盆地的最大风半径(RMW)和 34 kt 平均风半径(AR34),对 2001 年至 2021 年热带气旋(TC)的大小变化进行了线性和二次曲线拟合分析。计算分别针对两类热带气旋:热带风暴(TS)和飓风(HT)。还讨论了登陆和非登陆热带气旋的大小变化。结果表明,热带气旋的大小变化在流域间存在很大差异。主要结论包括1)总体而言,三个流域的TS内核都变大了,在NATL和WAPC有显著的增大趋势,而HT的内核大多变小或保持相似;2)同时,TC外核尺寸和登陆TC尺寸的流域间差异比较大;3)特别是在EPAC,登陆HT外核尺寸显著减小;4)相反,在NATL和WPAC,登陆TS内核尺寸显著增大。这些分析结果将有助于未来有关热带气旋预报、风暴潮研究和气旋气候及其变化的研究。
{"title":"Changes of tropical cyclone size in three oceanic basins of the northern hemisphere from 2001 to 2021","authors":"Banglin Zhang, Jeremy Cheuk-Hin Leung, Shengyuan Liu, Jianjun Xu","doi":"10.1007/s11707-022-1064-4","DOIUrl":"https://doi.org/10.1007/s11707-022-1064-4","url":null,"abstract":"<p>In this study the changes of tropical cyclone (TC) size from 2001 to 2021 are analyzed based on linear and quadratic curve fittings of the National Hurricane Center (NHC) / Joint Typhoon Warning Center (JTWC) best track data, based on the radius of maximum wind (RMW) and the average radius of 34-kt wind (AR34), in three oceanic basins of the North Atlantic (NATL), the Western North Pacific (WPAC) and the Eastern North Pacific (EPAC). The computations are done separately for two categories of tropical cyclones: tropical storms (TS) and hurricanes (HT). Size changes of landfalling and non-landfalling TCs are also discussed. Results show that there is a great inter-basin variability among the changes in TC sizes. Major conclusions include: 1) overall, the inner cores of TSs have become larger in all three basins, with the increasing tendencies being significant in the NATL and WAPC, while those of HTs mostly get smaller or remain similar; 2) meanwhile, comparatively large inter-basin differences are observed for the TC outer core sizes, and the sizes of landfalling TCs; 3) particularly, a significant decrease in landfalling HT outer core size is observed over the EPAC; 4) in contrast, significant increases in landfalling TS inner core size are found over the NATL and WPAC. The presented analysis results could benefit future research about TC forecasts, storm surge studies, and the cyclone climate and its changes.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"35 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140008265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantitative evaluation of adsorbed and free water in deep shales: a case study on the Wufeng-Longmaxi Formations from the Luzhou area, southern Sichuan Basin, China 深部页岩中吸附水和自由水的定量评价:中国四川盆地南部泸州地区五峰-龙马溪地层案例研究
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-02-26 DOI: 10.1007/s11707-022-1056-4
Shengxian Zhao, Yongyang Liu, Shuangfang Lu, Shuaihu Liu, Wenbiao Li, Zhiyan Zhou, Yashuo Wang, Zhaojing Song

Deep shale gas reservoirs commonly contain connate water, which affects the enrichment and migration of shale gas and has attracted the attention of many scholars. It is significant to quantitatively estimate the amounts of adsorbed and free water in shale matrix pores, considering the different impacts of pore water (adsorbed water and free water) on shale gas. In this paper, pore water in six deep shale samples from the Wufeng-Longmaxi Formations in the Luzhou area, southern Sichuan Basin, China, was quantitatively evaluated by saturation-centrifugation experiments. Further, the impact of shale material composition and microstructure on the pore water occurrence was analyzed. The results show that amounts of adsorbed and free water are respectively 1.7967–9.8218 mg/g (mean 6.4501 mg/g) and 9.5511–19.802 mg/g (mean 13.9541 mg/g) under the experimental conditions (30°C, distilled water). The ratio of adsorbed water to total water is 15.83%–42.61% (mean 30.45%). The amounts of adsorbed and free water are related to the pore microstructure and material compositions of shale. The specific surface area of shale controls the amount of adsorbed water, and the pore volume controls the amount of free water; organic pores developed in shale solid asphalt contribute specific surface area and pore volume, and inorganic pores developed in clay mineral contribute pore volume. Therefore, the pores of shale solid asphalt accumulate the adsorbed water and free water, and the pores of clay minerals mainly accumulate the free water.

深层页岩气藏通常含有涵养水,涵养水会影响页岩气的富集和迁移,已引起许多学者的关注。考虑到孔隙水(吸附水和游离水)对页岩气的不同影响,定量估算页岩基质孔隙中吸附水和游离水的数量意义重大。本文通过饱和离心实验,对中国四川盆地南部泸州地区五峰-龙马溪地层六个深层页岩样品中的孔隙水进行了定量评估。此外,还分析了页岩材料组成和微观结构对孔隙水发生的影响。结果表明,在实验条件(30°C、蒸馏水)下,吸附水和游离水的含量分别为 1.7967-9.8218 mg/g(平均 6.4501 mg/g)和 9.5511-19.802 mg/g(平均 13.9541 mg/g)。吸附水与总水量之比为 15.83%-42.61%(平均值为 30.45%)。吸附水和游离水的数量与页岩的孔隙微观结构和材料成分有关。页岩的比表面积控制吸附水量,孔隙体积控制游离水量;页岩固体沥青中发育的有机孔隙贡献了比表面积和孔隙体积,粘土矿物中发育的无机孔隙贡献了孔隙体积。因此,页岩固体沥青的孔隙积聚了吸附水和自由水,而粘土矿物的孔隙主要积聚自由水。
{"title":"Quantitative evaluation of adsorbed and free water in deep shales: a case study on the Wufeng-Longmaxi Formations from the Luzhou area, southern Sichuan Basin, China","authors":"Shengxian Zhao, Yongyang Liu, Shuangfang Lu, Shuaihu Liu, Wenbiao Li, Zhiyan Zhou, Yashuo Wang, Zhaojing Song","doi":"10.1007/s11707-022-1056-4","DOIUrl":"https://doi.org/10.1007/s11707-022-1056-4","url":null,"abstract":"<p>Deep shale gas reservoirs commonly contain connate water, which affects the enrichment and migration of shale gas and has attracted the attention of many scholars. It is significant to quantitatively estimate the amounts of adsorbed and free water in shale matrix pores, considering the different impacts of pore water (adsorbed water and free water) on shale gas. In this paper, pore water in six deep shale samples from the Wufeng-Longmaxi Formations in the Luzhou area, southern Sichuan Basin, China, was quantitatively evaluated by saturation-centrifugation experiments. Further, the impact of shale material composition and microstructure on the pore water occurrence was analyzed. The results show that amounts of adsorbed and free water are respectively 1.7967–9.8218 mg/g (mean 6.4501 mg/g) and 9.5511–19.802 mg/g (mean 13.9541 mg/g) under the experimental conditions (30°C, distilled water). The ratio of adsorbed water to total water is 15.83%–42.61% (mean 30.45%). The amounts of adsorbed and free water are related to the pore microstructure and material compositions of shale. The specific surface area of shale controls the amount of adsorbed water, and the pore volume controls the amount of free water; organic pores developed in shale solid asphalt contribute specific surface area and pore volume, and inorganic pores developed in clay mineral contribute pore volume. Therefore, the pores of shale solid asphalt accumulate the adsorbed water and free water, and the pores of clay minerals mainly accumulate the free water.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"2015 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139968907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic synthetic analysis of circulation field of tropical cyclones affecting Shanghai 影响上海的热带气旋环流场动态合成分析
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-02-08 DOI: 10.1007/s11707-022-1046-6
Wen Gu, Caijun Yue, Zhihui Han, Yanqing Gao, Yuqi Tang, Xiangyu Ao, Yao Yao

Eleven tropical cyclones (TCs) affected Shanghai and crossed the same latitude as Shanghai from 2007 to 2018. According to similar tracks from best-track data, TCs that cause significant precipitation in Shanghai can be divided into three types: landfall TCs, nearshore northward TCs, and western TCs. Based on ERA5 reanalysis data, the dynamic synthesis method was used to synthesize TC circulation situations to compare thermal, dynamic, water vapor, and stability conditions within TC circulations during the period when they affected Shanghai. The conclusions are as follows. 1) When the three TC types are at the same latitude as Shanghai, they are all in the divergent field in the upper troposphere. For the landfall type, the subtropical high at 500 hPa is stronger and farther north than usual, and there is a high-pressure dam on the north side of the TCs. 2) The warm advection of the three TC types at 925 hPa is located in the northern quadrant of the TCs. The dynamic and water vapor conditions are good in the north-western quadrant of landfall and western TCs, and more favorable in the eastern quadrant of nearshore northward TCs. 3) The favorable effects of all three types on precipitation in Shanghai come from the boundary layer. Water vapor, upward motion, and instability conditions of landfall TCs are superior to the other two TC types. The best water vapor, dynamic, and convective instability conditions are at the northern boundary in Shanghai during landfall TCs, and the main sources of water vapor in Shanghai come from the eastern and northern boundaries. During nearshore northward TCs, the main contribution to precipitation is from the eastern boundary, while better dynamic and water vapor conditions come from the western and northern boundaries during western TCs. The above findings provide scientific and technical support for operational forecasting precipitation from TCs affecting mega-cities.

从2007年到2018年,共有11个热带气旋(TC)影响上海并穿过上海同纬度地区。根据最佳路径资料的相似轨迹,造成上海明显降水的TC可分为登陆型TC、近岸北上型TC和西部型TC三种类型。基于ERA5再分析资料,采用动态合成法合成TC环流情况,比较TC影响上海期间TC环流内部的热力、动力、水汽和稳定性条件。结论如下1) 当三种类型的TC与上海处于同一纬度时,它们都处于对流层高层的发散场中。就登陆型而言,500 hPa处的副热带高气压较常年偏强、偏北,TC北侧有高压坝;就登陆型而言,500 hPa处的副热带高气压较常年偏强、偏北,TC北侧有高压坝。2)三种TC类型在925 hPa的暖平流位于TC的北象限。在登陆TC和西部TC的西北象限,动力和水汽条件较好,而在近岸偏北TC的东象限,动力和水汽条件更为有利。3) 三种类型对上海降水的有利影响都来自边界层。登陆TC的水汽、上升运动和不稳定条件优于其他两种TC。在登陆型TC期间,上海北部边界的水汽、动力和对流不稳定条件最好,上海的水汽主要来自东部和北部边界。在近岸偏北TC期间,降水主要来自东部边界,而在西部TC期间,较好的动力和水汽条件来自西部和北部边界。上述研究结果为影响特大城市的TC降水实况预报提供了科技支撑。
{"title":"Dynamic synthetic analysis of circulation field of tropical cyclones affecting Shanghai","authors":"Wen Gu, Caijun Yue, Zhihui Han, Yanqing Gao, Yuqi Tang, Xiangyu Ao, Yao Yao","doi":"10.1007/s11707-022-1046-6","DOIUrl":"https://doi.org/10.1007/s11707-022-1046-6","url":null,"abstract":"<p>Eleven tropical cyclones (TCs) affected Shanghai and crossed the same latitude as Shanghai from 2007 to 2018. According to similar tracks from best-track data, TCs that cause significant precipitation in Shanghai can be divided into three types: landfall TCs, nearshore northward TCs, and western TCs. Based on ERA5 reanalysis data, the dynamic synthesis method was used to synthesize TC circulation situations to compare thermal, dynamic, water vapor, and stability conditions within TC circulations during the period when they affected Shanghai. The conclusions are as follows. 1) When the three TC types are at the same latitude as Shanghai, they are all in the divergent field in the upper troposphere. For the landfall type, the subtropical high at 500 hPa is stronger and farther north than usual, and there is a high-pressure dam on the north side of the TCs. 2) The warm advection of the three TC types at 925 hPa is located in the northern quadrant of the TCs. The dynamic and water vapor conditions are good in the north-western quadrant of landfall and western TCs, and more favorable in the eastern quadrant of nearshore northward TCs. 3) The favorable effects of all three types on precipitation in Shanghai come from the boundary layer. Water vapor, upward motion, and instability conditions of landfall TCs are superior to the other two TC types. The best water vapor, dynamic, and convective instability conditions are at the northern boundary in Shanghai during landfall TCs, and the main sources of water vapor in Shanghai come from the eastern and northern boundaries. During nearshore northward TCs, the main contribution to precipitation is from the eastern boundary, while better dynamic and water vapor conditions come from the western and northern boundaries during western TCs. The above findings provide scientific and technical support for operational forecasting precipitation from TCs affecting mega-cities.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"22 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139761290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Changes in lake area and water level in response to hydroclimate variations in the source area of the Yellow River: a case study from Lake Ngoring 黄河源区水文气候变异引起的湖泊面积和水位变化:以糯宁湖为例进行的研究
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-01-23 DOI: 10.1007/s11707-022-1069-z
Yang Pu, Min Zhan, Xiaohua Shao, Josef P. Werne, Philip A. Meyers, Jiaojiao Yao, Da Zhi

In the north-eastern Qinghai-Tibet Plateau (QTP), the source area of the Yellow River (SAYR) has been experiencing significant changes in climatic and environmental conditions in recent decades. To date, few studies have combined modern hydrological conditions with paleoclimate records to explore the mechanism(s) of these changes. This study seeks to improve understanding of hydrological variability on decadal and centennial timescales in the SAYR and to identify its general cause. We first determined annual fluctuations in the surface area of Lake Ngoring from 1985 to 2020 using multi-temporal Landsat images. The results show that lake surface area changes were generally consistent with variations in precipitation, streamflow and the regional dry-wet index in the SAYR, suggesting that the water balance of the Lake Ngoring area is closely associated with regional hydroclimate changes. These records are also comparable to the stalagmite δ18O monsoon record, as well fluctuations in the Southern Oscillation Index (SOI). Moreover, an association of high TSI (total solar insolation) anomalies and sunspot numbers with the expansion of Lake Ngoring surface area is observed, implying that solar activity is the key driving factor for hydrologic variability in the SAYR on a decadal timescale. Following this line of reasoning, we compared the δ13Corg-based lake level fluctuations of Lake Ngoring for the last millennium, as previously reported, with the hydroclimatic history and the reconstructed TSI record. We conclude that the hydrological regime of Lake Ngoring has been mainly controlled by centennial fluctuations in precipitation for the last millennium, which is also dominated by solar activity. In general, it appears that solar activity has exerted a dominant influence on the hydrological regime of the SAYR on both decadal and centennial timescales, which is clearly manifested in the variations of lake area and water level of Lake Ngoring.

近几十年来,青藏高原东北部的黄河源头地区(SAYR)的气候和环境条件发生了显著变化。迄今为止,很少有研究结合现代水文条件和古气候记录来探索这些变化的机制。本研究旨在进一步了解 SAYR 地区十年和百年时间尺度上的水文变化,并找出其一般原因。我们首先利用多时相大地遥感卫星图像确定了 1985 年至 2020 年期间糯宁湖湖面面积的年度波动。结果表明,湖面面积的变化与萨耶尔地区降水量、溪流流量和区域干湿指数的变化基本一致,表明糯岭湖地区的水平衡与区域水文气候的变化密切相关。这些记录还与石笋δ18O季风记录以及南方涛动指数(SOI)的波动具有可比性。此外,我们还观察到高 TSI(太阳总日照量)异常和太阳黑子数与恩戈林湖湖面面积扩大之间的联系,这意味着太阳活动是十年时间尺度上萨亚尔地区水文变化的关键驱动因素。根据这一推理,我们将之前报告的糯宁湖过去千年基于δ13Corg的湖面波动与水文气候历史和重建的TSI记录进行了比较。我们的结论是,过去一千年来,糯林湖的水文机制主要受降水量的百年波动控制,而降水量的百年波动也受太阳活动的主导。总的看来,太阳活动在十年和百年时间尺度上都对赛里木盆地的水文机制产生了主导影响,这一点在糯岭湖湖泊面积和水位的变化中得到了明显体现。
{"title":"Changes in lake area and water level in response to hydroclimate variations in the source area of the Yellow River: a case study from Lake Ngoring","authors":"Yang Pu, Min Zhan, Xiaohua Shao, Josef P. Werne, Philip A. Meyers, Jiaojiao Yao, Da Zhi","doi":"10.1007/s11707-022-1069-z","DOIUrl":"https://doi.org/10.1007/s11707-022-1069-z","url":null,"abstract":"<p>In the north-eastern Qinghai-Tibet Plateau (QTP), the source area of the Yellow River (SAYR) has been experiencing significant changes in climatic and environmental conditions in recent decades. To date, few studies have combined modern hydrological conditions with paleoclimate records to explore the mechanism(s) of these changes. This study seeks to improve understanding of hydrological variability on decadal and centennial timescales in the SAYR and to identify its general cause. We first determined annual fluctuations in the surface area of Lake Ngoring from 1985 to 2020 using multi-temporal Landsat images. The results show that lake surface area changes were generally consistent with variations in precipitation, streamflow and the regional dry-wet index in the SAYR, suggesting that the water balance of the Lake Ngoring area is closely associated with regional hydroclimate changes. These records are also comparable to the stalagmite <i>δ</i><sup>18</sup>O monsoon record, as well fluctuations in the Southern Oscillation Index (SOI). Moreover, an association of high TSI (total solar insolation) anomalies and sunspot numbers with the expansion of Lake Ngoring surface area is observed, implying that solar activity is the key driving factor for hydrologic variability in the SAYR on a decadal timescale. Following this line of reasoning, we compared the <i>δ</i><sup>13</sup>C<sub>org</sub>-based lake level fluctuations of Lake Ngoring for the last millennium, as previously reported, with the hydroclimatic history and the reconstructed TSI record. We conclude that the hydrological regime of Lake Ngoring has been mainly controlled by centennial fluctuations in precipitation for the last millennium, which is also dominated by solar activity. In general, it appears that solar activity has exerted a dominant influence on the hydrological regime of the SAYR on both decadal and centennial timescales, which is clearly manifested in the variations of lake area and water level of Lake Ngoring.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"4 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139561488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dust transport information and paleoclimatic changes revealed by the loess in Ranwu, south-eastern Xizang 西藏东南部然乌黄土揭示的粉尘迁移信息与古气候变化
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-01-13 DOI: 10.1007/s11707-023-1092-8
Meihui Pan, Huimin Zhao, Anna Yang, Yougui Chen, Chenlu Li

The loess accumulation process has great potential to record patterns of atmospheric circulation change, paleoclimate, and paleoenvironmental evolution. South-eastern Xizang is a climatically sensitive region and here, we analyze a loess profile at Ranwu in order to explore the processes and interactions of dust transport and paleoclimate evolution in the region. Based on parametric grain size end-member analysis, optically stimulated luminescence (OSL) dating, and environmental proxies we show that the Ranwu loess profile comprises five end members (EMs). EM1 represents the fine silt fraction transported by high-altitude westerly winds over long distances; EM2 represents the medium silt fraction accumulated by glacier winds; EM3 is the coarse silt fraction transported by local dust storms under the action of strong glacier winds; EM4 represents the very fine sand fraction transported by strong local dust storms, different wind strengths controls the relative proportion of EM3 and EM4 over time. EM5 is the coarse sand fraction formed from the product of strong weathering of gravels. OSL dating shows loess sedimentation at Ranwu started around 11.16 ka. The prevailing climate was generally warm and wet between 11.6 and 4.2 ka, with four cooling events at 10.50, 9.18, 7.85, and 6.37 ka. Extensive paleosol development between 8.2 and 4.2 ka, a change to dry and cold climate conditions was favorable for loess formation after 4.2 ka. The palaeoenvironmental changes and abrupt climate events recorded in the Ranwu loess sequence are consistent with Holocene global environmental changes.

黄土堆积过程在记录大气环流变化、古气候和古环境演变模式方面具有巨大潜力。西藏东南部是一个气候敏感地区,在此,我们分析了然乌黄土剖面,以探索该地区尘土迁移与古气候演变的过程和相互作用。基于参数粒度末端成员分析、光激发发光(OSL)测年和环境代用指标,我们发现然乌黄土剖面由五个末端成员(EMs)组成。EM1 代表由高空西风长距离搬运的细粉砂部分;EM2 代表由冰川风积聚的中粉砂部分;EM3 是在强冰川风作用下由当地沙尘暴搬运的粗粉砂部分;EM4 代表由当地强沙尘暴搬运的极细砂部分,不同的风力控制着 EM3 和 EM4 随时间变化的相对比例。EM5 是砾石强烈风化后形成的粗沙部分。OSL 测年显示,然乌的黄土沉积始于 11.16 ka 前后。在 11.6 ka 至 4.2 ka 期间,气候普遍温暖湿润,在 10.50、9.18、7.85 和 6.37 ka 期间出现了四次降温。8.2 ka至4.2 ka期间古沉积广泛发育,4.2 ka之后气候条件转为干冷,有利于黄土的形成。然乌黄土序列中记录的古环境变化和突变气候事件与全新世全球环境变化一致。
{"title":"Dust transport information and paleoclimatic changes revealed by the loess in Ranwu, south-eastern Xizang","authors":"Meihui Pan, Huimin Zhao, Anna Yang, Yougui Chen, Chenlu Li","doi":"10.1007/s11707-023-1092-8","DOIUrl":"https://doi.org/10.1007/s11707-023-1092-8","url":null,"abstract":"<p>The loess accumulation process has great potential to record patterns of atmospheric circulation change, paleoclimate, and paleoenvironmental evolution. South-eastern Xizang is a climatically sensitive region and here, we analyze a loess profile at Ranwu in order to explore the processes and interactions of dust transport and paleoclimate evolution in the region. Based on parametric grain size end-member analysis, optically stimulated luminescence (OSL) dating, and environmental proxies we show that the Ranwu loess profile comprises five end members (EMs). EM1 represents the fine silt fraction transported by high-altitude westerly winds over long distances; EM2 represents the medium silt fraction accumulated by glacier winds; EM3 is the coarse silt fraction transported by local dust storms under the action of strong glacier winds; EM4 represents the very fine sand fraction transported by strong local dust storms, different wind strengths controls the relative proportion of EM3 and EM4 over time. EM5 is the coarse sand fraction formed from the product of strong weathering of gravels. OSL dating shows loess sedimentation at Ranwu started around 11.16 ka. The prevailing climate was generally warm and wet between 11.6 and 4.2 ka, with four cooling events at 10.50, 9.18, 7.85, and 6.37 ka. Extensive paleosol development between 8.2 and 4.2 ka, a change to dry and cold climate conditions was favorable for loess formation after 4.2 ka. The palaeoenvironmental changes and abrupt climate events recorded in the Ranwu loess sequence are consistent with Holocene global environmental changes.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"19 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139465398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Climate change in the Hongliujing area of Lop Nur over the past 200 years revealed by the stable oxygen isotopes of Tamarix cones 柽柳锥体稳定氧同位素揭示罗布泊红柳井地区过去 200 年的气候变化
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-01-13 DOI: 10.1007/s11707-023-1088-4
Zhiguang Li, Yaqing Dong, Haoyu Zhang, Hongxiao Sun, Danyang Jia, Shikai Song, Yuanjie Zhao

The layers of Tamarix cones within sedimentary deposits in arid regions have significant chronological and paleoenvironmental implications. Here, we compare the δ18O values of Tamarix cones in the Hongliujing area of Lop Nur with meteorological data for the Ruoqiang meteorological station for 1960–2019 AD. Linear regression analysis was used to reconstruct the average temperature for April and the precipitation for November in the Hongliujing area over the past 200 years. The results showed that the δ18O values were significantly negatively correlated with the temperature for February, April, May, August, December, and with the annual mean temperature; significantly negatively correlated with the precipitation for February and April; significantly negatively correlated with the sunshine hours for March and May; significantly positively correlated with the sunshine hours for February, July, August, October, and December, and with the annual mean values; and significantly correlated with the relative humidity for April, July, August, September, October, and November, and with the annual mean values. Based on the δ18O record of the past 200 years, the Hongliujing area experienced two warm-wet periods (1874–1932 and 2004–2019 AD) and two cold-dry periods (1832–1873 and 1933–2003 AD). Thus, the climate was characterized by alternating warm-wet and cold-dry conditions. Wavelet analysis revealed three main cycles: 45 years, 29 years, and 14 years.

干旱地区沉积层中的柽柳锥体层具有重要的年代学和古环境意义。在此,我们将罗布泊红柳井地区柽柳锥的δ18O值与若羌气象站公元1960-2019年的气象数据进行了比较。利用线性回归分析重建了红柳井地区近 200 年来 4 月的平均气温和 11 月的降水量。结果表明,δ18O值与2月、4月、5月、8月、12月的气温以及年平均气温呈显著负相关;与2月和4月的降水量呈显著负相关;与3月和5月的日照时数呈显著负相关;与2月、7月、8月、10月和12月的日照时数以及年平均值呈显著正相关;与4月、7月、8月、9月、10月和11月的相对湿度以及年平均值呈显著正相关。根据近 200 年的δ18O 记录,红柳泾地区经历了两个暖湿期(公元 1874 年-1932 年和公元 2004 年-2019 年)和两个寒冷干燥期(公元 1832 年-1873 年和公元 1933 年-2003 年)。因此,当时的气候特点是暖湿和冷干交替出现。小波分析显示了三个主要周期:45 年、29 年和 14 年。
{"title":"Climate change in the Hongliujing area of Lop Nur over the past 200 years revealed by the stable oxygen isotopes of Tamarix cones","authors":"Zhiguang Li, Yaqing Dong, Haoyu Zhang, Hongxiao Sun, Danyang Jia, Shikai Song, Yuanjie Zhao","doi":"10.1007/s11707-023-1088-4","DOIUrl":"https://doi.org/10.1007/s11707-023-1088-4","url":null,"abstract":"<p>The layers of <i>Tamarix</i> cones within sedimentary deposits in arid regions have significant chronological and paleoenvironmental implications. Here, we compare the <i>δ</i><sup>18</sup>O values of <i>Tamarix</i> cones in the Hongliujing area of Lop Nur with meteorological data for the Ruoqiang meteorological station for 1960–2019 AD. Linear regression analysis was used to reconstruct the average temperature for April and the precipitation for November in the Hongliujing area over the past 200 years. The results showed that the <i>δ</i><sup>18</sup>O values were significantly negatively correlated with the temperature for February, April, May, August, December, and with the annual mean temperature; significantly negatively correlated with the precipitation for February and April; significantly negatively correlated with the sunshine hours for March and May; significantly positively correlated with the sunshine hours for February, July, August, October, and December, and with the annual mean values; and significantly correlated with the relative humidity for April, July, August, September, October, and November, and with the annual mean values. Based on the <i>δ</i><sup>18</sup>O record of the past 200 years, the Hongliujing area experienced two warm-wet periods (1874–1932 and 2004–2019 AD) and two cold-dry periods (1832–1873 and 1933–2003 AD). Thus, the climate was characterized by alternating warm-wet and cold-dry conditions. Wavelet analysis revealed three main cycles: 45 years, 29 years, and 14 years.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"35 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Late Holocene brGDGTs-based quantitative paleotemperature reconstruction from lacustrine sediments on the western Tibetan Plateau 基于全新世晚期青藏高原湖沼沉积物的古温度定量重建研究
IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.1007/s11707-022-1082-2
Xiumei Li, Sutao Liu, Juzhi Hou, Zhe Sun, Mingda Wang, Xiaohuan Hou, Minghua Liu, Junhui Yan, Lifang Zhang

We present a quantitative mean annual air temperature (MAAT) record spanning the past 4700 years based on the analysis of branched glycerol dialkyl glycerol tetraethers (brGDGTs) from a sediment core from Xiada Co, an alpine lake on the western Tibetan Plateau (TP). The record indicates a relatively stable and warm MAAT until 2200 cal yr BP; subsequently, the MAAT decreased by ∼4.4°C at ∼2100 cal yr BP and maintained a cooling trend until the present day, with centennial-scale oscillations centered at ∼800 cal yr BP, ∼600 cal yr BP, and ∼190–170 cal yr BP. MAAT decreased abruptly at ∼500–300 cal yr BP and reached its minimum for the past 4700 years. We assessed the representativeness of our record by comparing it with 15 published paleotemperature records from the TP spanning the past ∼5000 years. The results show divergent temperature variations, including a gradual cooling trend, a warming trend, and no clear trend. We suggest that these discrepancies could be caused by factors such as the seasonality of the temperature proxies, the length of the freezing season of the lakes, the choice of proxy-temperature calibrations, and chronological errors. Our results highlight the need for more high-quality paleotemperature reconstructions with unambiguous climatic significance, clear seasonality, site-specific calibration, and robust dating, to better understand the processes, trends, and mechanisms of Holocene temperature changes on the TP.

我们基于对青藏高原西部高山湖泊霞大湖沉积岩芯中支链甘油二烷基甘油四醚(brGDGTs)的分析,提供了跨越过去4700年的年平均气温(MAAT)定量记录。该记录表明,在公元前2200年之前,青藏高原最高气温相对稳定且偏高;随后,在公元前2100年时,青藏高原最高气温下降了4.4°C,并一直保持降温趋势,直到今天,其中以公元前800年、公元前600年和公元前190-170年为中心出现了百年尺度的震荡。MAAT在公元前500-300年骤然下降,并在过去的4700年达到最低值。我们将我们的记录与 15 个已发表的横跨过去 5000 年的 TP 古温度记录进行了比较,以评估其代表性。结果显示了不同的温度变化,包括逐渐变冷的趋势、变暖的趋势以及无明显趋势。我们认为,这些差异可能是由温度代用指标的季节性、湖泊冰冻季节的长度、代用指标-温度校准的选择以及年代学误差等因素造成的。我们的研究结果突出表明,需要更多具有明确气候意义、清晰季节性、特定地点校准和可靠年代测定的高质量古温度重建,以更好地理解全新世大洋洲温度变化的过程、趋势和机制。
{"title":"Late Holocene brGDGTs-based quantitative paleotemperature reconstruction from lacustrine sediments on the western Tibetan Plateau","authors":"Xiumei Li, Sutao Liu, Juzhi Hou, Zhe Sun, Mingda Wang, Xiaohuan Hou, Minghua Liu, Junhui Yan, Lifang Zhang","doi":"10.1007/s11707-022-1082-2","DOIUrl":"https://doi.org/10.1007/s11707-022-1082-2","url":null,"abstract":"<p>We present a quantitative mean annual air temperature (MAAT) record spanning the past 4700 years based on the analysis of branched glycerol dialkyl glycerol tetraethers (brGDGTs) from a sediment core from Xiada Co, an alpine lake on the western Tibetan Plateau (TP). The record indicates a relatively stable and warm MAAT until 2200 cal yr BP; subsequently, the MAAT decreased by ∼4.4°C at ∼2100 cal yr BP and maintained a cooling trend until the present day, with centennial-scale oscillations centered at ∼800 cal yr BP, ∼600 cal yr BP, and ∼190–170 cal yr BP. MAAT decreased abruptly at ∼500–300 cal yr BP and reached its minimum for the past 4700 years. We assessed the representativeness of our record by comparing it with 15 published paleotemperature records from the TP spanning the past ∼5000 years. The results show divergent temperature variations, including a gradual cooling trend, a warming trend, and no clear trend. We suggest that these discrepancies could be caused by factors such as the seasonality of the temperature proxies, the length of the freezing season of the lakes, the choice of proxy-temperature calibrations, and chronological errors. Our results highlight the need for more high-quality paleotemperature reconstructions with unambiguous climatic significance, clear seasonality, site-specific calibration, and robust dating, to better understand the processes, trends, and mechanisms of Holocene temperature changes on the TP.</p>","PeriodicalId":48927,"journal":{"name":"Frontiers of Earth Science","volume":"211 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Frontiers of Earth Science
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1