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Sediment recycling during the Holocene marine transgression in Ría de Vigo (NW Iberia): multiproxy evidence and environmental implications Ría de Vigo(伊比利亚西北部)全新世海洋变迁期间的沉积物循环:多代理证据和环境影响
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-17 DOI: 10.1016/j.quascirev.2024.109006
C. Muñoz Sobrino , A. Castro-Parada , V. Cartelle , N. Martínez-Carreño , C. Delgado , N. Cazás , I. Lázaro , S. García-Gil
<div><div>A new multiproxy study of a 155-cm sediment core located in Ría de Vigo (NW Iberia) recording the transgressive and highstand system tract of the Holocene sea-level rise is presented. New data described include grain size, geochemical analyses, high-resolution qualitative/quantitative analyses of pollen, non-pollen palynomorphs and dinoflagellate cysts content, the qualitative evaluation of diatoms at different key levels and the reconsideration of some seismic interpretations. Besides, 14 radiocarbon dates were obtained from shells and pollen extracts. This new evidence revealed that notable changes in the sedimentation rates and the relative abundance of the different types of palynomorphs occurred during the Holocene. The sediment core studied shows anomalous pollen successions, including unexpected <em>Pinus</em> pollen peaks, during the Early and Middle-Holocene. Differential dating revealed that those anomalous successions correspond to conspicuously aged sediment that has inverted pollen chronologies. Thus, these facies may constitute evidence of redeposition of ancient upland sediments, formed above the ancient coastline at different intervals comprised between the end of the Last Glacial Maximum and the early stages of the Lateglacial, which were rich in very resistant pollen types (<em>Pinus</em>). Dinoflagellate cyst records in combination with the non-reworked pollen evidence reveal a reliable climatic seesaw during the Holocene, includingwet stormy periods of prevailing mixed waters, with strong development of <em>Lingulodinium</em> and high accumulation rates in dinoflagellate cysts, which alternate with other sparsely stormy and drier phases, characterised by the coastal upwelling intensification, well-stratified waters, and increases in <em>Bitectatodinium</em> and <em>Spiniferites</em> spp. but low accumulation rates in dinoflagellate cysts. These climatic dynamics, including a millennial drier cool period that occurred just after the Thermal Optimum are consistent with previous evidence obtained in other limnetic systems in the Iberian Peninsula. Furthermore, there is a delay between the two phases with the highest marine contribution to sediment (ca. 11.0-8.2 and ca. 4.0–3.0 cal ka BP) and the subsequent warm stages when the relative sea level stabilises: the Thermal Optimum (8.0–6.0 ka BP) and the 2.5-0.5 ka BP interval, respectively. Changes in <em>Pinus</em> pollen concentrations and grain size recorded in the postglacial sediments suggest that some upland ancient (Lateglacial) pollen evidence might be remobilised, especially during stages of upwelling intensification, and then resedimented in the seabed. Further studies will be needed to determine if the significant differences existing between the <em>Pinus</em> pollen grain sizes respond to climatic variations affecting the region or have been the result of any replacement of pine species in the area. Nonetheless, <em>Pinus</em> pollen evidence almost disappeare
本文介绍了对位于 Ría de Vigo(伊比利亚西北部)的 155 厘米沉积物岩芯进行的一项新的多代研究,该岩芯记录了全新世海平面上升过程中的跃进和高台系统道。介绍的新数据包括粒度、地球化学分析、高分辨率花粉、非花粉古生物和甲藻孢囊含量的定性/定量分析、不同关键层硅藻的定性评估以及对一些地震解释的重新考虑。此外,还从贝壳和花粉提取物中获得了 14 个放射性碳年代。这些新证据表明,全新世期间,沉积速率和不同类型古动物的相对丰度发生了显著变化。所研究的沉积物岩芯显示了早全新世和中全新世期间的异常花粉演替,包括意想不到的松树花粉高峰。差异年代测定显示,这些异常演替与花粉年代倒置的明显老化沉积物相对应。因此,这些地层可能是古代高地沉积物重新沉积的证据,这些沉积物是在末次冰川极盛期末期和大冰川早期之间的不同时期在古代海岸线上方形成的,其中富含抗性很强的花粉类型(松树)。双鞭毛虫孢囊记录与非重整花粉证据相结合,揭示了全新世期间可靠的气候跷跷板,包括盛行混合水域的潮湿风暴期,Lingulodinium 大量繁殖,双鞭毛虫孢囊的积累率很高;与之交替的是其他稀疏风暴期和干燥期,其特点是沿岸上升流加强,水域分层良好,Bitectatodinium 和 Spiniferites spp.增加,但双鞭毛虫孢囊的积累率较低。但甲藻孢囊的积累率较低。这些气候动态,包括热最适期之后出现的千年干旱凉爽期,与之前在伊比利亚半岛其他湖泊系统中获得的证据一致。此外,海洋对沉积物贡献最大的两个阶段(约公元前 11.0-8.2 年和约公元前 4.0-3.0 年)与随后相对海平面趋于稳定的温暖阶段(分别为热最适期(公元前 8.0-6.0 年)和公元前 2.5-0.5 年)之间存在延迟。冰期后沉积物中记录的松树花粉浓度和粒径的变化表明,一些高地古(冰期)花粉证据可能被重新移动,特别是在上升流加强的阶段,然后重新沉积在海底。要确定松树花粉粒径之间存在的显著差异是与影响该地区的气候变异有关,还是该地区松树物种更替的结果,还需要进一步的研究。尽管如此,松树花粉证据几乎随着该地区人类活动的最初迹象而消失,直到现代人口重新聚居后才得以恢复。我们的发现为我们进一步了解沉积物再加工和再循环机制提供了新的可能性,即通过整合包括花粉、地震和沉积数据在内的多代理研究。
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引用次数: 0
Hydroclimate modulation of central-eastern Mexico by the North Atlantic subtropical high since the little ice age 小冰期以来北大西洋副热带高原对墨西哥中东部水文气候的调节作用
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-16 DOI: 10.1016/j.quascirev.2024.108981
Patricia Piacsek , Juan Pablo Bernal , María del Pilar Aliaga-Campuzano , Luis Bernardo Chavero , Fernanda Lases-Hernández , Francisco William da Cruz , Nicolás Misailidis Strikís , Liliana Corona-Martinez , Veronica M. Ramirez , Marília Harumi Shimizu , Herminio Rojas
We reconstructed the hydroclimate of central-eastern Mexico over the last 700 common era (CE) based on inferences from multi-proxies from a stalagmite (K-Inc) collected at Karmidas cave, eastern México. Projections on hydroclimate variability in Mexico raise concerns about possible future occurrences of severe droughts and seasonal water balance fluctuations related to increased global temperatures caused by anthropogenic climate change (Murray-Tortarolo, 2021). The eastern region influences the production and supply of food to Mexico. Simulations of past climates, validated by paleoclimate records, yield valuable perspectives on climate change and enhance our understanding of future projections. However, the paucity of paleoclimatic records hinders understanding past hydroclimatic variations and their climatic mechanisms in eastern Mexico. Our record covers the Little Ice Age (LIA) through the Historical Interval (HI), a crucial period for understanding the climate repercussions spanning the transition from Earth's climatic history to the post-industrial era. The reduced intensity of the North Atlantic Subtropical High (NASH) during the LIA enabled a prominent negative phase of NAO-like variability from 1600 CE until the end of LIA. Consequently, preferent meridional airflow within the continent fosters the encounter of moisture-laden intrusions with the increased frequency of cold surges as the occurrence of frontal rain in eastern Mexico, impairing the amount effect on the K-Inc δ18O record. However, after the artificial opening of the cave in 1910 CE, the δ18O records of K-Inc began to exhibit a ∼20-year oscillatory periodicity. In this context, the trace elements of K-Inc help elucidate the climatic conditions that governed the precipitation regime during the investigated period. The visual alignment between the zonal sea surface temperature (SST) variability in the eastern equatorial Pacific (EEP) and the trace elements (Sr/Ca and Ba/Ca) of K-Inc reveals their relationship. Warm zonal SST in the EEP appears to be associated with changes in the length of the winter and summer seasons in eastern Mexico during the LIA. In contrast, over the HI, the trace elements of K-Inc show an anti-phase response to Warm zonal SST in the EEP, denoting wetter climate conditions at the vicinities of Karmidas Cave. This configuration led to questioning the influence of SST zonal variability in the EEP during the HI, which was probably masked by more relevant climate forcing. Our findings enabled us to draw climate scenarios by addressing the main climate drivers in our records.
我们根据从墨西哥东部卡米达斯洞穴采集的石笋(K-Inc)中提取的多种代用指标推断,重建了过去 700 个公元纪墨西哥中东部的水文气候。对墨西哥水文气候变异性的预测引起了人们对未来可能发生的严重干旱和与人为气候变化导致全球气温升高有关的季节性水平衡波动的担忧(Murray-Tortarolo,2021 年)。东部地区影响着墨西哥的粮食生产和供应。模拟过去的气候,并通过古气候记录进行验证,可为气候变化提供宝贵的视角,并增强我们对未来预测的理解。然而,古气候记录的缺乏阻碍了我们对墨西哥东部过去水文气候变迁及其气候机制的了解。我们的记录涵盖了小冰河时期(LIA)到历史时期(HI),这是了解地球气候史向后工业时代过渡期间气候影响的关键时期。LIA 期间北大西洋副热带高纬度(NASH)强度降低,使得从公元 1600 年到 LIA 结束期间出现了明显的类似 NAO 的负变率阶段。因此,大陆内部的偏向经向气流促进了水汽入侵,增加了墨西哥东部发生锋面雨的冷涌频率,损害了 K-Inc δ18O记录的量效应。然而,在西元 1910 年洞穴被人为打开之后,K-Inc 的 δ18O 记录开始呈现出 20 年的振荡周期。在这种情况下,K-Inc 的微量元素有助于阐明调查期间降水机制的气候条件。东赤道太平洋(EEP)地带性海面温度(SST)变化与 K-Inc 痕量元素(Sr/Ca 和 Ba/Ca)之间的直观吻合揭示了它们之间的关系。东赤道太平洋温暖的地带性 SST 似乎与 LIA 期间墨西哥东部冬夏季节长度的变化有关。与此相反,在高海拔地区,K-Inc 的痕量元素显示出与东欧太平洋暖区海温的反相响应,这表明卡米达斯洞穴附近的气候条件更加潮湿。这种构造使我们对高纬度冲击期间东欧太平洋海温带变率的影响产生了疑问,这种影响很可能被更相关的气候强迫所掩盖。我们的研究结果使我们能够通过解决记录中的主要气候驱动因素来绘制气候情景。
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引用次数: 0
Beryllium ten production and relative paleointensity for the past 1.2 million years 过去 120 万年的铍十生产和相对古强度
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-16 DOI: 10.1016/j.quascirev.2024.108993
Jean-Pierre Valet , Tatiana Savranskaia , Ramon Egli , Quentin Simon , Franck Bassinot , Nicolas Thouveny
Composite curves of relative paleointensity document the evolution of the geomagnetic field intensity during the past 1.2 Million years. Several records of production of 10Be cosmogenic isotope from the 10Be/9Be ratio (referred to as Be-ratio) covering this period have also been acquired. We add here new 10Be records to the database and produce a first composite curve of beryllium production (Be-1200) for the past 1.2 Myr. We compare Be-1200 with Sint-2000 (Valet et al., 2005) and PISO-1500 (Channell et al., 2009) paleointensity curves. The three curves show similar patterns, but frequently different amplitudes. The variations in dipole moment values derived from the Sint-2000 and PISO-1500 relative paleointensity composite curves were then confronted with the geomagnetic dipole moment record derived from the Be-1200 record. The predicted amplitudes of dipole moment loss during geomagnetic excursions reconstructed from the measured in the Be-1200 record are generally compatible with those deduced from SINT-2000 and PISO-1500. More specifically, the three datasets indicate very low field intensities during the Laschamp, that are consistent with the existence of reverse directions, and to a lesser extent during other events (Iceland basin, Calabrian Ridge/West Eifel events). The two paleointensity curves show a decrease in field intensity of at least 80–90% during the reversals. The Be- derived dipole moment decreases meet the predictions for the Brunhes/Matuyama transition, but are significantly smaller than expected for the two Jaramillo transitions. Such limited variability may result from the impact of environmental factors on the Be ratios, as suggested in a previous study of the last reversal (Savranskaia et al., 2021). This comparative study of 10Be records and relative paleointensity records reveals that, in particular cases, Be ratio records can underestimate the amplitude of virtual geomagnetic dipole variation. With their respective strengths and weakness, these two approaches provide similar first-order patterns relevant to the common control by the geomagnetic moment variation.
相对古强度的复合曲线记录了过去 120 万年间地磁场强度的演变。在这一时期,我们还从 10Be/9Be 比率(简称为铍比率)中获得了一些 10Be 宇宙同位素的生成记录。我们在此将新的 10Be 记录添加到数据库中,并制作了过去 1.2 百万年铍生成量(Be-1200)的第一条综合曲线。我们将 Be-1200 与 Sint-2000 (Valet 等人,2005 年)和 PISO-1500 (Channell 等人,2009 年)古强度曲线进行了比较。三条曲线显示出相似的模式,但振幅经常不同。然后,将 Sint-2000 和 PISO-1500 相对古强度综合曲线得出的偶极矩值变化与 Be-1200 记录得出的地磁偶极矩记录进行对比。根据 Be-1200 记录中的测量值重建的地磁偏移期间偶极矩损失的预测振幅与 SINT-2000 和 PISO-1500 中推导出的振幅基本一致。更具体地说,这三个数据集显示,在拉斯汉普事件期间,地磁场强度非常低,这与反方向的存在是一致的,而在其他事件(冰岛盆地、卡拉布里亚海脊/西埃菲尔事件)期间,地磁场强度则较低。两条古强度曲线显示,在逆转期间,场强至少下降了 80-90%。从铍得出的偶极矩下降符合对布鲁内斯/马图雅山转变的预测,但明显小于对两次哈拉米洛转变的预期。这种有限的可变性可能是由于环境因素对 Be 比率的影响造成的,正如之前对最后一次逆转的研究(Savranskaia 等人,2021 年)所指出的那样。对 10Be 记录和相对古强度记录的比较研究表明,在某些情况下,Be 比率记录可能会低估虚拟地磁偶极子变化的幅度。这两种方法各有优缺点,但都提供了与地磁矩变化的共同控制有关的类似的一阶模式。
{"title":"Beryllium ten production and relative paleointensity for the past 1.2 million years","authors":"Jean-Pierre Valet ,&nbsp;Tatiana Savranskaia ,&nbsp;Ramon Egli ,&nbsp;Quentin Simon ,&nbsp;Franck Bassinot ,&nbsp;Nicolas Thouveny","doi":"10.1016/j.quascirev.2024.108993","DOIUrl":"10.1016/j.quascirev.2024.108993","url":null,"abstract":"<div><div>Composite curves of relative paleointensity document the evolution of the geomagnetic field intensity during the past 1.2 Million years. Several records of production of <sup>10</sup>Be cosmogenic isotope from the <sup>10</sup>Be/<sup>9</sup>Be ratio (referred to as Be-ratio) covering this period have also been acquired. We add here new <sup>10</sup>Be records to the database and produce a first composite curve of beryllium production (Be-1200) for the past 1.2 Myr. We compare Be-1200 with Sint-2000 (Valet et al., 2005) and PISO-1500 (Channell et al., 2009) paleointensity curves. The three curves show similar patterns, but frequently different amplitudes. The variations in dipole moment values derived from the Sint-2000 and PISO-1500 relative paleointensity composite curves were then confronted with the geomagnetic dipole moment record derived from the Be-1200 record. The predicted amplitudes of dipole moment loss during geomagnetic excursions reconstructed from the measured in the Be-1200 record are generally compatible with those deduced from SINT-2000 and PISO-1500. More specifically, the three datasets indicate very low field intensities during the Laschamp, that are consistent with the existence of reverse directions, and to a lesser extent during other events (Iceland basin, Calabrian Ridge/West Eifel events). The two paleointensity curves show a decrease in field intensity of at least 80–90% during the reversals. The Be- derived dipole moment decreases meet the predictions for the Brunhes/Matuyama transition, but are significantly smaller than expected for the two Jaramillo transitions. Such limited variability may result from the impact of environmental factors on the Be ratios, as suggested in a previous study of the last reversal (Savranskaia et al., 2021). This comparative study of <sup>10</sup>Be records and relative paleointensity records reveals that, in particular cases, Be ratio records can underestimate the amplitude of virtual geomagnetic dipole variation. With their respective strengths and weakness, these two approaches provide similar first-order patterns relevant to the common control by the geomagnetic moment variation.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108993"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Tracking orbital and suborbital climate variability in the westernmost Mediterranean over the past 13,000 years: New insights from paleoperspectives on marine productivity responses 追踪过去 13,000 年地中海最西部的轨道和亚轨道气候变异性:从古角度看海洋生产力反应的新见解
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-14 DOI: 10.1016/j.quascirev.2024.109001
Ricardo D. Monedero-Contreras , Francisca Martínez-Ruiz , Francisco J. Rodríguez-Tovar , José M. Mesa-Fernández , Francesca Sangiorgi
This study presents a comprehensive analysis of a sediment record from the Western Alboran Basin (core GP04PC), utilizing palynological and geochemical tools to investigate marine productivity responses to orbital and suborbital climate variability over the past 13,000 years. High productivity during the Younger Dryas humid phase (∼12.4–11.7 ka) and the Holocene humidity optimum (∼10.5–8.5 ka) was driven by increased local river discharges resulting from rapid mountain glaciers melting and enhanced regional precipitation. During the late Holocene, frequent flood events linked to negative North Atlantic Oscillation (NAO) incursions potentially led to multicentennial-scale productivity increases. The findings indicate that periods characterized by wet regional conditions and increased river run-off, influenced by orbital (e.g., insolation cycles) and suborbital factors (e.g., NAO and Atlantic Meridional Overturning Circulation changes), consistently enhanced marine productivity in the Western Alboran Basin. The study also reveals that the current high productivity and carbon export in the Western Alboran Basin are maintained by active upwelling and downwelling systems driven by a persistent positive NAO phase following the southward migration of the Intertropical Convergence Zone (ITCZ) that occurred around 6.5 ka. Furthermore, geochemical proxies support a strong detrital influence on trace metal concentrations, including barium (Ba), in deep Western Alboran sediments during the Holocene. This limits the use of Ba/Al ratios for accurately reconstructing productivity changes and highlights the importance of dinocyst analysis as a complementary tool for robust marine productivity reconstructions in this region. These observations provide valuable paleoperspectives on marine ecosystem responses to climate variability, contributing to the development of robust long-term productivity models essential for adapting to ongoing environmental changes in the region, and demonstrating the strong influence of North Atlantic climate and ocean dynamics on centennial-scale productivity oscillations in this region.
本研究全面分析了西阿尔伯兰盆地的沉积记录(岩心 GP04PC),利用古生物学和地球化学工具研究了过去 13,000 年间海洋生产力对轨道和亚轨道气候变异的响应。小干纪湿润期(12.4-11.7 ka)和全新世最佳湿润期(10.5-8.5 ka)的高生产力是由高山冰川快速融化和区域降水增加导致的当地河流排水量增加所驱动的。在全新世晚期,与北大西洋涛动(NAO)负面入侵有关的频繁洪水事件可能导致多世纪规模的生产力增长。研究结果表明,受轨道因素(如日照周期)和亚轨道因素(如北大西洋涛动和大西洋经向翻转环流变化)的影响,以区域湿润和河流径流量增加为特征的时期持续提高了西阿尔伯兰盆地的海洋生产力。该研究还揭示,在 6.5 ka 年左右热带辐合带(ITCZ)南移之后,NAO 相持续为正,在此推动下,活跃的上涌和下沉系统维持了西阿尔博兰盆地目前的高生产力和碳输出。此外,地球化学代用指标支持全新世期间西阿尔伯兰深层沉积物中的痕量金属浓度(包括钡(Ba))受到强烈的碎屑影响。这就限制了利用钡/铝比率来准确重建生产力的变化,并强调了恐龙囊分析作为一种补充工具对重建该地区海洋生产力的重要性。这些观测结果为海洋生态系统应对气候变异提供了宝贵的古视角,有助于建立健全的长期生产力模型,这对适应该地区正在发生的环境变化至关重要,同时也证明了北大西洋气候和海洋动力学对该地区百年尺度生产力振荡的强大影响。
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引用次数: 0
A high-resolution tephra record from Castiglione maar reveals the timing and unveils cryptic eruptions over the most recent volcanic activity at Colli Albani, central Italy 来自 Castiglione maar 的高分辨率沉积物记录揭示了意大利中部科利阿尔巴尼最近火山活动的时间并揭开了隐秘喷发的面纱
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-12 DOI: 10.1016/j.quascirev.2024.108989
Bianca Scateni , Gianfranco Di Vincenzo , Giuseppe Re , Biagio Giaccio , Gaia Siravo , Alessandra Smedile , Patrizia Macrì , Alessio Di Roberto
Integrating proximal and medial-distal tephra records from continuous sedimentary archives has recently proven to be crucial for obtaining more complete and highly resolved stratigraphic and chronological histories of explosive activity, allowing a detailed and accurate assessment of volcanic hazards. The sedimentary succession from the Castiglione maar, about 20 km east of Rome, hosts a long and continuous lacustrine record extending back to ca. 365 ka, including a number of tephra layers derived from the explosive activity of peri-Tyrrhenian volcanic centres. An integrated tephrochronological investigation, which combines stratigraphic, textural, mineralogical, geochemical and 40Ar/39Ar geochronological analyses, was conducted on six tephra layers occurred between 11 and 15 m-depth of the Castiglione composite section. This section records the history of the most recent explosive activity of the Colli Albani volcano and relates to the Albano maar. Results reveal that the Albano maar volcanic history actually comprises six explosive events that are younger than previously thought and occurred in a narrower time interval. Specifically, 40Ar/39Ar ages determined on four of the six tephra, along with the modelled ages for the remaining two, indicate that the eruptive activity of the last sub-cycle of the Albano maar lasted 3.4 +0.4/-0.6 ka, and occurred between 37.71 ± 0.34 ka (40Ar/39Ar age of the first eruption) and 34.34 +0.25/-0.45 ka (modelled age of the last eruption). Results refine the history of the most recent explosive activity at Colli Albani volcano and underscore the importance of studying tephra preserved in medial-distal continuous sedimentary archives for a comprehensive reconstruction of the eruptive history. Based on the data collected, the previously unrecognised explosive eruptions were likely of medium magnitude but sufficiently large to produce highly fragmented and widely dispersed ash. We argue that these new findings should be considered for an updated long-term hazard assessment of the Colli Albani volcanic area. Results, and especially the new high-precision ages, also allow to improve the tephrochronological framework in the dispersal area of the Albano tephra, including the iconic paleoclimatic archives of Monticchio and Fucino.
最近的研究证明,整合连续沉积档案中的近端和中-远端表壳记录,对于获得更完整、更清晰的爆炸活动地层和年代学历史,从而对火山灾害进行详细、准确的评估至关重要。罗马以东约 20 千米处的卡斯蒂利昂火山口的沉积演替拥有可追溯到约 365 ka 年的漫长而连续的湖沼记录,其中包括泰勒瑞尼亚周边火山中心爆炸活动产生的大量表壳层。对卡斯蒂利昂复合断面 11 米至 15 米深度之间的六个表土层进行了综合表土年代学调查,结合了地层学、质地学、矿物学、地球化学和 40Ar/39Ar 地球年代学分析。该剖面记录了科利阿尔巴尼火山最近的爆炸活动历史,并与阿尔巴诺火山口有关。研究结果表明,阿尔巴诺火山历史实际上包括六次爆炸活动,这些活动比以前认为的要年轻,发生的时间间隔也较窄。具体地说,对六块表皮岩中的四块测定的 40Ar/39Ar 年龄以及对其余两块表皮岩测定的模拟年龄表明,阿尔巴诺火山最后一个子周期的喷发活动持续了 3.4 +0.4/-0.6 ka,发生在 37.71 ± 0.34 ka(第一次喷发的 40Ar/39Ar 年龄)和 34.34 +0.25/-0.45 ka(最后一次喷发的模拟年龄)之间。研究结果完善了科利阿尔巴尼火山最近一次爆发活动的历史,并强调了研究保存在中纵向连续沉积档案中的火山灰对全面重建火山爆发历史的重要性。根据收集到的数据,之前未被确认的爆炸性喷发可能属于中等规模,但足以产生高度破碎和广泛分散的火山灰。我们认为,在对阿尔巴尼火山地区进行最新的长期危害评估时,应考虑这些新发现。研究结果,尤其是新的高精度年龄,还有助于改进阿尔巴诺火山碎屑散布地区的风化年代学框架,包括蒙蒂奇奥和富奇诺的标志性古气候档案。
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引用次数: 0
Surges of the Black Rapids Glacier tracked climate over the last 600 years 黑激流冰川的涌动追踪了过去 600 年的气候情况
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-12 DOI: 10.1016/j.quascirev.2024.108969
D.H. Mann , P.R. Wilson , B.V. Gaglioti , P. Groves , M.E. Young
Deposits of surge-type glaciers are widespread in the glacial geologic record; however, it is unclear how climate changes occurring at time scales of decades to centuries affect surge-type glaciers. Here we reconstruct the history of the Black Rapids Glacier (BRG) in the eastern Alaska Range since AD 1400 using a combination of geomorphology, stratigraphy, lichenometry, radiocarbon dating, and dendrochronology. Moraines in the glacier's foreland record four advances, all of which left deposits typical of surging glaciers. A surge in the AD 1600s dammed a lake which drained in an outburst flood ca. AD 1703-04. Another outburst flood from a larger glacier-dammed lake occurred in the AD 1400s. Based on the BRG's observed glaciology and its history over the last several centuries, its surge cycles have varied between 80 and 120 years. Between AD 1400 and 1900, the most extensive surges of the BRG coincided with minima in the Seuss / de Vries solar cycle when non-surging glaciers in the region also advanced. Synchroneity between the BRG, solar minima, and non-surging glaciers is surprising given that the terminus of the BRG was largely unresponsive to climate for 80–120 years between surges. One explanation is that the BRG's surge cycle shortened during the Little Ice Age (LIA, ca. AD 1300–1900) to the point that its climate-response lag resembled that of neighboring, non-surging glaciers. Although the reconstructed chronology of the BRG shows no indication of the surge cycle decreasing during the LIA, fading of the record with time makes it difficult to exclude this possibility. Another explanation is that the BRG's 80- to 120-year cycle is the result of tuning by the solar cycle over the course of millennia. Tuning occurred when quiescent phases that coincided with solar minima were shortened because of faster replenishment of the glacier's reservoir zone. The opposite occurred when the glacier's quiescent phases coincided with solar maxima. The net result was to align the surge cycle of the BRG with solar minima. Some combination of shortened surge cycles during the LIA and tuning by the solar cycle may be why the glacial-geologic record of this particular surge-type glacier provides a surprisingly dependable record of regional climate over the past 600 years.
在冰川地质记录中,涌浪型冰川沉积非常普遍;然而,目前还不清楚几十年到几百年时间尺度的气候变化如何影响涌浪型冰川。在这里,我们结合地貌学、地层学、地衣测量学、放射性碳年代测定法和树木年代学,重建了自公元 1400 年以来阿拉斯加山脉东部黑激流冰川(BRG)的历史。冰川前缘的冰碛物记录了冰川的四次推进,所有这些推进都留下了典型的涌动冰川沉积物。公元 1600 年的一次冰川暴涨形成了一个湖泊,在大约公元 1703-04 年的一次溃决洪水中被冲走。在公元 1400 年,另一个更大的冰川堰塞湖也发生了溃决洪水。根据对 BRG 的冰川观测及其过去几个世纪的历史,其暴涨周期在 80 到 120 年之间。在公元 1400 年至 1900 年期间,白垩纪冰川最大规模的激增与苏斯/德弗里斯太阳周期的最小值相吻合,当时该地区的非激增冰川也在前进。鉴于 BRG 总站在两次暴涨之间的 80-120 年间基本不对气候做出反应,BRG、太阳周期最小值和非暴涨冰川之间的同步性令人惊讶。一种解释是,在小冰河时期(LIA,约公元 1300-1900 年),BRG 的涌动周期缩短,以至于它对气候的反应滞后于邻近的非涌动冰川。虽然重建的 BRG 年表没有显示出在小冰河时期涌动周期缩短的迹象,但随着时间的推移,记录的逐渐消失,很难排除这种可能性。另一种解释是,BRG 的 80 至 120 年周期是太阳周期在几千年中调整的结果。当冰川的静止期与太阳的最小值相吻合时,由于冰川库区的补充速度加快,静止期就会缩短。当冰川的静止期与太阳的最大值重合时,则会出现相反的情况。最终的结果是,布拉格冰川的涌浪周期与太阳的极小值一致。在低潮期,冰川的涌动周期缩短,而太阳周期的调整可能是这一特殊涌动型冰川的冰川地质记录为过去 600 年的区域气候提供了令人惊讶的可靠记录的原因。
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引用次数: 0
A 6000-year high-resolution composite record of El Niño-related drought in subtropical southeast Africa 东南非洲亚热带地区 6000 年厄尔尼诺相关干旱的高分辨率复合记录
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-11 DOI: 10.1016/j.quascirev.2024.108992
Marc Humphries , Kei Prior , Andrew Green , Derrick Vaughn
El Niño–Southern Oscillation (ENSO) extremes have a major impact on global temperature and rainfall patterns, triggering severe droughts and floods in many regions of the world. Paleoclimate records reveal significant changes in ENSO activity at centennial and millennial scales, but uncertainty remains regarding the exact nature of these variations during the Holocene and how they impacted climate patterns across different regions. Here we present a highly resolved sedimentary record from Lake Bhangazi North on the subtropical east coast of South Africa, where modern-day rainfall variability is profoundly influenced by ENSO through teleconnections mediated by the Walker Circulation. Stratigraphic and inorganic geochemical proxies at Lake Bhangazi North provide evidence for significant fluctuations in the local hydrological regime, characterised by extended intervals of aridity. Our findings corroborate independent sedimentary evidence from nearby sites at Lake Muzi and Mkhuze Delta, allowing for the generation of a composite proxy record of drought for the region. This record provides compelling evidence for the occurrence of several major drought events at ∼5100–4200, 3600–2700, 1900–1700 and ∼990 cal yr BP. The timing of these distinctive events exhibits striking correspondence with the ENSO proxy sedimentary record from Laguna Pallcacocha, Ecuador. We propose that El Niño, impacting moisture convergence over the subtropical eastern region of South Africa, was the primary driver of drought in the region over the mid-to-late Holocene. This hypothesis is further supported by stalagmite records from northwest Madagascar that reveal pronounced shifts towards wetter conditions coincident with major drought events in our study area, consistent with the modern rainfall anomaly pattern associated with ENSO. Our findings suggest that major aridity phases observed in records from the east coast of South Africa likely reflect large-scale shifts in regional moisture transport across subtropical southeastern Africa, driven by fluctuations in ENSO conditions.
厄尔尼诺-南方涛动(ENSO)极端现象对全球气温和降雨模式有重大影响,在世界许多地区引发严重干旱和洪水。古气候记录揭示了厄尔尼诺/南方涛动活动在百年和千年尺度上的显著变化,但在全新世期间这些变化的确切性质以及它们如何影响不同地区的气候模式方面仍存在不确定性。在这里,我们展示了来自南非亚热带东海岸班加齐北湖的高分辨率沉积记录,在这里,现代降雨量变化通过沃克环流介导的远程联系受到厄尔尼诺/南方涛动的深刻影响。北班加齐湖的地层和无机地球化学代用指标为当地水文系统的显著波动提供了证据,其特点是干旱期延长。我们的研究结果证实了附近穆齐湖和姆库泽三角洲地区的独立沉积证据,从而生成了该地区干旱的综合代用记录。该记录提供了令人信服的证据,证明在公元前 5100-4200 年、3600-2700 年、1900-1700 年和∼990 年发生过几次重大干旱事件。这些独特事件的发生时间与厄瓜多尔帕尔卡科查湖的厄尔尼诺/南方涛动代用沉积记录惊人地吻合。我们认为,厄尔尼诺现象影响了南非东部亚热带地区的水汽辐合,是造成该地区全新世中晚期干旱的主要原因。来自马达加斯加西北部的石笋记录进一步支持了这一假设,这些记录显示,在我们研究的地区,在发生重大干旱事件的同时,天气明显变湿,这与厄尔尼诺/南方涛动相关的现代降雨异常模式一致。我们的研究结果表明,从南非东海岸的记录中观察到的主要干旱阶段很可能反映了受厄尔尼诺/南方涛动现象影响,整个非洲东南部亚热带地区水汽输送的大规模变化。
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引用次数: 0
From a coastal plain to an anthropized fluvial valley (NW Brittany, France): 7.3 kyr of paleoenvironmental evolution from sedimentological, palynological and paleogenomic perspectives 从沿海平原到人类化河谷(法国布列塔尼西北部):从沉积学、古生物学和古基因组学角度看 7.3 千年的古环境演变
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-10 DOI: 10.1016/j.quascirev.2024.108983
Ophélie David , Muriel Vidal , Aneta Gorczyńska , Aurélie Penaud , Yvan Pailler , Clément Nicolas , Evelyne Goubert , Pierre Stéphan , Morgane Ollivier , Frédérique Barloy-Hubler
Over the Holocene (last 11.7 kyr), the Brittany coastal region has undergone major changes in response to rising sea level, climatic fluctuations and increasing anthropogenic influence. This study aims to i) accurately reconstruct the paleoenvironmental evolution of a site located on the north Brittany coast (NW France), a sector that has not been previously investigated thoroughly, and ii) improve the detection of the anthropogenic signature in paleoenvironmental records by using a multidisciplinary approach. To achieve these goals, we made the first cross-correlated study in coastal Brittany region, integrating sedimentological (grain-size, X-ray fluorescence), palynological (pollen grains), and paleogenomic (on plant and mammal sedimentary ancient DNA or sedaDNA) data, which we based two 7.3 kyr-long sedimentary sequences recovered from the Kerallé valley (Plouescat, NW Brittany).
First, sedimentary and vegetation trajectories allowed us to reconstruct the evolution of past depositional environments in the inner part of the Kerallé valley. The data show a progressive sedimentary infilling of the former alluvial plain, subjected to marine incursion between 7.3 and 6 cal ka BP, up to a continental area, totally disconnected from tidal influence since 5.4 cal ka BP. Second, the analysis of plant and mammal sedaDNA provided a complementary tool to the pollen analysis, enhancing our ability to accurately detect past land-use practices. In the upstream part of the Kerallé system, anthropogenic influence remained scarce until the late Neolithic and seemed to be restricted to the coast, as also indicated by archaeological remains. The first significant human-driven changes in plant community composition likely date back to 4.5 cal ka BP (i.e., late Neolithic), as also shown by the presence of domesticated mammal sedaDNA, both being in agreement with the documented settlement by the first metal-working societies (Bell Beaker culture) in the Plouescat area. From then until 4 cal ka BP (i.e., early Bronze Age), human pressure became more obvious, with the steadily increase in anthropogenic pollen indicators, while sedaDNA of plants and mammals were affected by preservation biases. At 2.7 cal ka BP (i.e., Iron Age), a new anthropic threshold was characterized by maximal forest clearing leading to significant human-induced soil erosion across the Kerallé watershed. Since then, at the local scale of our study, both vegetation dynamics and the presence of domesticated mammals observed by sedaDNA attest to the development of pastoralism.
在全新世(过去 11.7 千年),布列塔尼沿海地区因海平面上升、气候波动和人类活动的影响而发生了重大变化。本研究旨在 i) 准确重建位于布列塔尼海岸北部(法国西北部)的一个地点的古环境演变,该地区以前未被深入研究过;ii) 采用多学科方法改进古环境记录中人为特征的检测。为了实现这些目标,我们首次在布列塔尼沿海地区开展了交叉相关研究,整合了沉积学(粒度、X 射线荧光)、古植物学(花粉粒)和古基因组学(植物和哺乳动物沉积古 DNA 或 sedaDNA)数据,并以两个 7.首先,通过沉积和植被轨迹,我们重建了凯拉雷山谷内部过去沉积环境的演变。这些数据显示,在公元前 7.3 至 6 千卡年间,前冲积平原逐渐被沉积物填满,并受到海洋的侵袭,直至公元前 5.4 千卡后完全脱离潮汐影响的大陆地区。其次,植物和哺乳动物沉积DNA分析为花粉分析提供了补充工具,提高了我们准确探测过去土地利用方式的能力。在凯拉雷水系的上游地区,直到新石器时代晚期,人类活动的影响仍然很小,而且似乎仅限于沿海地区,考古遗迹也表明了这一点。人类对植物群落组成的首次重大改变可能可以追溯到公元前 4.5 卡(即新石器时代晚期),驯化哺乳动物 sedaDNA 的存在也表明了这一点,这两者都与有文献记载的最早的金属加工社会(贝尔比克文化)在普卢埃斯卡特地区定居的时间相吻合。从那时起到公元前 4 千卡(即青铜时代早期),人类的压力变得更加明显,人为花粉指标稳步上升,而植物和哺乳动物的 sedaDNA 则受到保存偏差的影响。在 2.7 cal ka BP(即铁器时代),一个新的人类活动阈值出现了,其特征是最大程度的森林砍伐导致整个凯拉雷流域出现了严重的人为水土流失。从那时起,在我们研究的当地范围内,植被动态和通过 sedaDNA 观察到的驯化哺乳动物的存在都证明了畜牧业的发展。
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引用次数: 0
Divergent responses of peatland development and carbon accumulation to volcanic eruptions on the Changbai Mountain, Northeast China 中国东北长白山泥炭地发育和碳积累对火山喷发的不同响应
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-10 DOI: 10.1016/j.quascirev.2024.108987
Qiulei Yan , Zicheng Yu
Peatlands are an important carbon reservoir of terrestrial ecosystems and play a key role in the global carbon cycle. Many peatlands exist in volcanic terrains, but we still lack a systematic understanding of the effects of volcanic ash deposition on peatland development and carbon dynamics. Here we used multi-proxy records from multiple cores at a high-elevation (1570 m a.s.l.) peatland complex on the southern slope of the Changbai Mountain—only 13 km from the crater lake Tianchi—to understand the peatland initiation and carbon accumulation processes under the influence of volcanic eruption. We quantified volcanic glass shards abundance in the peat core under a microscope to show the 5-cm-thick major Millennium Eruption (ME) in 946 CE, along with multiple cryptotephra layers identifiable above a constant background of low abundant shards. Plant macrofossil data show that the major ME volcanic ash deposition caused a large decrease in plant taxon richness, while three out of eight cryptotephra layers induced a brief increase in Sphagnum abundance after each ash deposition but had little impact on plant taxon richness. The divergence in response of species composition to different magnitudes of volcanic ash depositions indicates both beneficial and detrimental effects, perhaps depending on the degree of modifying the nutrient or hydrological status of the peatland. Our results also show that the 5-cm thick ME volcanic ash layer acted as an impermeable layer, increasing surface moisture conditions and promoting the formation of new peatlands on the landscape. Moreover, the ME ash deposition caused a significant decrease in the carbon accumulation rate that lasted for >200 years. Our study indicates that volcanic ash depositions have very different impacts on peatlands by promoting new peatland initiation but impeding carbon accumulation of existing peatlands, implying that the balance of these processes would determine the carbon sink capacity of peatlands in a region as a whole.
泥炭地是陆地生态系统的重要碳库,在全球碳循环中发挥着关键作用。许多泥炭地存在于火山地形中,但我们仍然缺乏对火山灰沉积对泥炭地发展和碳动态影响的系统了解。在这里,我们使用了来自长白山南坡高海拔(海拔1570米)泥炭地复合体的多个岩心的多代理记录,该复合体距离火山口湖天池仅13公里,从而了解火山喷发影响下的泥炭地形成和碳积累过程。我们在显微镜下对泥炭岩芯中的火山玻璃碎片丰度进行了量化,显示了公元946年5厘米厚的千年大喷发(ME),以及在低丰度碎片的恒定背景之上可识别的多个隐斑层。植物大化石数据显示,千年大喷发的火山灰沉积导致植物分类群丰富度大幅下降,而八层隐积岩中的三层在每次火山灰沉积后都会引起泥炭藓丰度的短暂上升,但对植物分类群丰富度影响不大。物种组成对不同程度火山灰沉积的反应差异表明,火山灰沉积既有有利影响,也有不利影响,这可能取决于对泥炭地营养或水文状况的改变程度。我们的研究结果还表明,5 厘米厚的 ME 火山灰层起到了不透水层的作用,增加了地表湿度条件,促进了地表新泥炭地的形成。此外,ME 火山灰沉积导致碳积累率显著下降,并持续了 200 年。我们的研究表明,火山灰沉积对泥炭地的影响截然不同,它促进了新泥炭地的形成,但阻碍了现有泥炭地的碳积累,这意味着这些过程的平衡将决定整个地区泥炭地的碳汇能力。
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引用次数: 0
Brine exploitation at Cacica (Romania): An application of radial model of salt supplying 卡奇卡(罗马尼亚)的卤水开采:盐供应径向模型的应用
IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Pub Date : 2024-10-10 DOI: 10.1016/j.quascirev.2024.108974
Marius Alexianu , Andrei Asăndulesei , Felix-Adrian Tencariu , Mihaela Asăndulesei , Roxana-Gabriela Curcă
Drawing on ethnoarchaeological field research conducted in Romania's Outer Carpathian region between 2007 and 2015, an ethnographic radial model for the supply of brine, recrystallized salt, and rock salt was developed. This paper aims to apply this model to prehistoric contexts, specifically the Neolithic, Chalcolithic, and Bronze Age periods, in relation to the brine sources at Cacica. The selection of this area is grounded in several factors: the presence of multiple brine sources, the use of the briquetage technique (a method for producing salt cakes in ceramic containers) during a specific phase of the Chalcolithic, extensive documentation from ethnographic and ethnohistorical studies, and a rich database on prehistoric settlement patterns.
At Cacica, two distinct methods of brine exploitation were identified: the production of salt cakes and the direct use of brine without human intervention, primarily for human and animal consumption. The authors utilized the Radial Model of Salt Supply to analyse these two methods of exploitation and suggest that this dual model could offer valuable insights into the understanding of inland briquetage sites across worldwide.
根据 2007 年至 2015 年期间在罗马尼亚外喀尔巴阡山地区开展的人种考古学田野调查,我们建立了一个卤水、重结晶盐和岩盐供应的人种学径向模型。本文旨在将这一模型应用于史前时期,特别是新石器时代、夏尔科利石时代和青铜时代,与卡奇卡的卤水源有关。选择该地区有几个因素:存在多个盐水源头、在旧石器时代的一个特定阶段使用了压块技术(一种在陶瓷容器中生产盐饼的方法)、人种学和人种史研究中的大量文献资料以及丰富的史前定居模式数据库。在卡西卡,发现了两种不同的盐水开采方法:生产盐饼和在没有人为干预的情况下直接使用盐水,主要用于人类和动物消费。作者利用盐供应径向模型分析了这两种开采方法,并认为这种双重模型可以为了解世界各地的内陆盐饼遗址提供宝贵的见解。
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引用次数: 0
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Quaternary Science Reviews
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