首页 > 最新文献

地球科学最新文献

英文 中文
IF:
Corona Discharges Glow on Trees Under Thunderstorms 电晕在雷暴下在树上发光
IF 5.2 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-12 DOI: 10.1029/2025gl119591
P. J. McFarland, W. H. Brune, D. O. Miller, J. M. Jenkins
Coronae, which are weak electrical discharges, have long been hypothesized to form on trees under thunderstorms, though never directly observed, characterized, or quantified. Using a newly developed instrument that measures ultraviolet emissions from coronae, the first direct observations and quantifications of coronae are presented for two trees under a thunderstorm in North Carolina. Coronae moved sporadically among leaves on every tree branch in a narrow field of view while the thunderstorm was directly overhead. Coronae emitted ∼1011 photons at 260 nm, corresponding to electrical currents of ∼1 μA, derived from unique measurements relating corona intensity to tree electrical current. Similar results across four additional storm intercepts from Florida to Pennsylvania give rise to a vision of swaths of scintillating corona glow as thunderstorms pass over forests. Such widespread coronae have implications for the removal of hydrocarbons emitted by trees, subtle tree leaf damage, and limited thunderstorm electrification.
日冕是一种微弱的放电,长期以来一直被假设在雷暴天气下在树上形成,尽管从未直接观察到,表征或量化。利用一种新开发的测量日冕紫外线辐射的仪器,对北卡罗来纳州雷暴下的两棵树的日冕进行了首次直接观测和量化。在一片狭窄的视野中,每根树枝上的树叶上都有日冕零星地移动,而雷暴正好在头顶上。日冕在260 nm处发射约1011个光子,对应于约1 μA的电流,这是由日冕强度与树电流的独特测量得出的。从佛罗里达州到宾夕法尼亚州的另外四个风暴拦截点也得到了类似的结果,这些结果产生了雷暴经过森林时闪烁的日冕光带的景象。如此广泛的日冕对树木排放的碳氢化合物的去除、轻微的树叶损伤和有限的雷暴电气化都有影响。
{"title":"Corona Discharges Glow on Trees Under Thunderstorms","authors":"P. J. McFarland, W. H. Brune, D. O. Miller, J. M. Jenkins","doi":"10.1029/2025gl119591","DOIUrl":"https://doi.org/10.1029/2025gl119591","url":null,"abstract":"Coronae, which are weak electrical discharges, have long been hypothesized to form on trees under thunderstorms, though never directly observed, characterized, or quantified. Using a newly developed instrument that measures ultraviolet emissions from coronae, the first direct observations and quantifications of coronae are presented for two trees under a thunderstorm in North Carolina. Coronae moved sporadically among leaves on every tree branch in a narrow field of view while the thunderstorm was directly overhead. Coronae emitted ∼10<sup>11</sup> photons at 260 nm, corresponding to electrical currents of ∼1 μA, derived from unique measurements relating corona intensity to tree electrical current. Similar results across four additional storm intercepts from Florida to Pennsylvania give rise to a vision of swaths of scintillating corona glow as thunderstorms pass over forests. Such widespread coronae have implications for the removal of hydrocarbons emitted by trees, subtle tree leaf damage, and limited thunderstorm electrification.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"13 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160284","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
Performance of WRF double-moment microphysics schemes in simulating pre-monsoon rainfall across diverse coastal climatic regions of India WRF双矩微物理方案在模拟印度不同沿海气候区的季风前降雨中的表现
IF 5.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2026-02-12 DOI: 10.1016/j.atmosres.2026.108860
N. Umakanth, Rupraj Biswasharma, Avinash N. Parde, Prafull P. Yadav, N. Naveena, Dev Niyogi, D.M. Lal, S.D. Pawar
{"title":"Performance of WRF double-moment microphysics schemes in simulating pre-monsoon rainfall across diverse coastal climatic regions of India","authors":"N. Umakanth, Rupraj Biswasharma, Avinash N. Parde, Prafull P. Yadav, N. Naveena, Dev Niyogi, D.M. Lal, S.D. Pawar","doi":"10.1016/j.atmosres.2026.108860","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.108860","url":null,"abstract":"","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"303 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Leveraging Laboratory Experiments of Shoreline Response to Sea-Level Rise: A Beach Disequilibrium Perspective 利用海岸线对海平面上升响应的实验室实验:海滩不平衡的视角
IF 5.2 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-12 DOI: 10.1029/2025gl120802
M. D’Anna, F. Ribas, G. Coco, P. M. Bayle, D. Calvete, A. Falqués, T. E. Baldock, A. L. Atkinson, T. Beuzen
This study analyzes laboratory data of beach response to sea-level rise (SLR), isolating shoreline changes driven by passive flooding (PF) of the beach and consequent wave-driven processes. The disequilibrium concept relates shoreline change to instantaneous and equilibrium beach states. While PF shifts the shoreline geometrically, SLR induces disequilibrium that produces wave-driven changes due to apparent profile changes. For the first time, 24 experiments from wave flumes of different scale (including new high-low energy cyclic waves experiments) are gathered into a dimensionless data set through a scaling technique to investigate SLR-induced processes. The data indicate trends (possibly linear) between relative wave power and wave-driven shoreline changes for a given SLR, highlighting the effects of changing background wave energy. Cyclic wave experiments best represent Bruun model's behavior. Wave-energy dissipation emerges as a key variable for quantifying SLR-induced disequilibrium, offering new pathways for future improvements of equilibrium shoreline models under SLR and wave-climate change.
本研究分析了海滩对海平面上升(SLR)响应的实验室数据,分离了海滩被动洪水(PF)和随之而来的波浪驱动过程驱动的海岸线变化。不平衡概念将海岸线变化与瞬时和平衡海滩状态联系起来。当PF使海岸线发生几何位移时,SLR引起不平衡,由于明显的剖面变化而产生波浪驱动的变化。采用标度技术,首次将不同尺度的24个波槽实验(包括新型高低能循环波实验)集合成一个无量纲数据集,研究slr诱导过程。数据显示了给定单反相对波浪能和波浪驱动的海岸线变化之间的趋势(可能是线性的),突出了背景波能变化的影响。循环波实验最能反映布鲁恩模型的特性。波浪能量耗散成为量化SLR引起的不平衡的关键变量,为SLR和波浪气候变化下平衡海岸线模型的未来改进提供了新的途径。
{"title":"Leveraging Laboratory Experiments of Shoreline Response to Sea-Level Rise: A Beach Disequilibrium Perspective","authors":"M. D’Anna, F. Ribas, G. Coco, P. M. Bayle, D. Calvete, A. Falqués, T. E. Baldock, A. L. Atkinson, T. Beuzen","doi":"10.1029/2025gl120802","DOIUrl":"https://doi.org/10.1029/2025gl120802","url":null,"abstract":"This study analyzes laboratory data of beach response to sea-level rise (SLR), isolating shoreline changes driven by passive flooding (PF) of the beach and consequent wave-driven processes. The disequilibrium concept relates shoreline change to instantaneous and equilibrium beach states. While PF shifts the shoreline geometrically, SLR induces disequilibrium that produces wave-driven changes due to apparent profile changes. For the first time, 24 experiments from wave flumes of different scale (including new high-low energy cyclic waves experiments) are gathered into a dimensionless data set through a scaling technique to investigate SLR-induced processes. The data indicate trends (possibly linear) between relative wave power and wave-driven shoreline changes for a given SLR, highlighting the effects of changing background wave energy. Cyclic wave experiments best represent Bruun model's behavior. Wave-energy dissipation emerges as a key variable for quantifying SLR-induced disequilibrium, offering new pathways for future improvements of equilibrium shoreline models under SLR and wave-climate change.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"91 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160282","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
Reconstructing proboscidean diet and mobility during the Younger Dryas through isotopic evidence from the Colby site, Wyoming, USA 通过美国怀俄明州科尔比遗址的同位素证据重建新仙女木期长鼻鲸的饮食和活动
IF 1.8 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL Pub Date : 2026-02-12 DOI: 10.1016/j.quaint.2026.110166
Briana N. Doering , Madeline E. Mackie , Molly A. Herron
The relatively rapid disappearance of proboscideans from the Americas coincides with both the arrival of the first Americans and the end of the most recent ice age. Researchers have increasingly employed evidence from bulk stable and radiogenic isotopes in attempting to better understand proboscidean behavior and how climate change and/or human predation may have influenced their eventual extinction. Here, we apply this technique to Columbian mammoths recovered from the Colby Site, Wyoming, USA, which has been associated chronologically with both the beginning of the Clovis cultural period, ca. 13,000 cal BP, and the Younger Dryas cooling event, ca. 12,900 cal BP. Comparing bulk C, O, and Sr isotopic values from multiple locations on each of these mammoths’ molars suggests that these mammoths had a relatively small range (<250 km), consumed primarily C3 plants, and lived in a cooler local environment than present. Based on comparisons across individual mammoth isotope values and previously sampled Pleistocene proboscideans, isotopic data suggest that the Colby mammoth assemblage resulted from multiple hunting episodes, indicating that Clovis hunters may have repeatedly and intentionally used this place to harvest mammoths and other animals. These findings have significance for understanding the diversity of proboscidean behavior during a time of immense environmental change.
长鼻猿在美洲相对迅速地消失,与第一批美洲人的到来和最近一次冰河时代的结束同时发生。研究人员越来越多地利用体积稳定同位素和放射性同位素的证据,试图更好地了解吻鲸的行为,以及气候变化和/或人类捕食如何影响它们的最终灭绝。在这里,我们将这项技术应用于从美国怀俄明州科尔比遗址发现的哥伦比亚猛犸象,该遗址在时间上与克洛维斯文化时期的开始(约13000 cal BP)和新Dryas冷却事件(约12900 cal BP)有关。比较这些猛犸象臼齿多个地点的总体C、O和Sr同位素值表明,这些猛犸象的活动范围相对较小(250公里),主要食用C3植物,生活在比现在更冷的当地环境中。通过对猛犸象个体的同位素值与先前采样的更新世长鼻动物的同位素值进行比较,同位素数据表明,科尔比猛犸象的组合是由多次狩猎事件造成的,这表明克洛维斯猎人可能多次有意地在这个地方捕获猛犸象和其他动物。这些发现对于理解在巨大的环境变化时期鼻鲸行为的多样性具有重要意义。
{"title":"Reconstructing proboscidean diet and mobility during the Younger Dryas through isotopic evidence from the Colby site, Wyoming, USA","authors":"Briana N. Doering ,&nbsp;Madeline E. Mackie ,&nbsp;Molly A. Herron","doi":"10.1016/j.quaint.2026.110166","DOIUrl":"10.1016/j.quaint.2026.110166","url":null,"abstract":"<div><div>The relatively rapid disappearance of proboscideans from the Americas coincides with both the arrival of the first Americans and the end of the most recent ice age. Researchers have increasingly employed evidence from bulk stable and radiogenic isotopes in attempting to better understand proboscidean behavior and how climate change and/or human predation may have influenced their eventual extinction. Here, we apply this technique to Columbian mammoths recovered from the Colby Site, Wyoming, USA, which has been associated chronologically with both the beginning of the Clovis cultural period, ca. 13,000 cal BP, and the Younger Dryas cooling event, ca. 12,900 cal BP. Comparing bulk C, O, and Sr isotopic values from multiple locations on each of these mammoths’ molars suggests that these mammoths had a relatively small range (&lt;250 km), consumed primarily C<sub>3</sub> plants, and lived in a cooler local environment than present. Based on comparisons across individual mammoth isotope values and previously sampled Pleistocene proboscideans, isotopic data suggest that the Colby mammoth assemblage resulted from multiple hunting episodes, indicating that Clovis hunters may have repeatedly and intentionally used this place to harvest mammoths and other animals. These findings have significance for understanding the diversity of proboscidean behavior during a time of immense environmental change.</div></div>","PeriodicalId":49644,"journal":{"name":"Quaternary International","volume":"760 ","pages":"Article 110166"},"PeriodicalIF":1.8,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146154200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Seismic Waves Do Sense Fracture Connectivity: Experimental Validation 地震波可以感知裂缝连通性:实验验证
IF 5.2 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-12 DOI: 10.1029/2025gl119174
Yanbin He, J. Germán Rubino, Jianping Liao, Guangui Zou, Tailang Zhao, Bin Li, Hui Li, Jinghuai Gao, Guiwen Xu, Klaus Holliger
Fracture connectivity is a key parameter controlling fluid flow throughout the Earth's crust. While some theoretical and numerical studies suggest that seismic waves are sensitive to fracture connectivity, an experimental validation of this critically important phenomenon was so far unavailable. In this study, we present a novel methodology for fabricating synthetic analogs of rock samples containing connected and unconnected fluid-saturated fractures with well-constrained geometric characteristics. Using a low-frequency forced-oscillation apparatus, we show that the P-wave velocities are higher in samples with unconnected fractures than in those with connected ones. Complementary numerical simulations corroborate these findings and indicate that the dominant mechanism behind the observed differences is wave-induced fluid pressure diffusion within connected fractures. Our results provide direct experimental evidence that, for otherwise identical fracture networks, the presence of interconnectivity produces a measurable reduction in P-wave velocity at seismic frequencies, which is consistent with that previously predicted by corresponding numerical models. This, in turn, opens new and important perspectives for the seismo-hydraulic characterization of fractured rocks.
裂缝连通性是控制流体在整个地壳中流动的关键参数。虽然一些理论和数值研究表明地震波对裂缝连通性很敏感,但迄今为止还没有对这一至关重要的现象进行实验验证。在这项研究中,我们提出了一种新的方法来合成含有连接和未连接的具有良好约束几何特征的流体饱和裂缝的岩石样品的模拟物。利用低频强迫振荡装置,我们发现不连通裂缝的纵波速度比连通裂缝的纵波速度要高。补充的数值模拟证实了这些发现,并表明所观察到的差异背后的主要机制是连接裂缝内波浪诱导的流体压力扩散。我们的研究结果提供了直接的实验证据,表明对于其他方面相同的裂缝网络,相互连接的存在会在地震频率下产生可测量的纵波速度降低,这与之前相应的数值模型预测的结果一致。这反过来又为裂缝岩石的地震-水力表征开辟了新的重要视角。
{"title":"Seismic Waves Do Sense Fracture Connectivity: Experimental Validation","authors":"Yanbin He, J. Germán Rubino, Jianping Liao, Guangui Zou, Tailang Zhao, Bin Li, Hui Li, Jinghuai Gao, Guiwen Xu, Klaus Holliger","doi":"10.1029/2025gl119174","DOIUrl":"https://doi.org/10.1029/2025gl119174","url":null,"abstract":"Fracture connectivity is a key parameter controlling fluid flow throughout the Earth's crust. While some theoretical and numerical studies suggest that seismic waves are sensitive to fracture connectivity, an experimental validation of this critically important phenomenon was so far unavailable. In this study, we present a novel methodology for fabricating synthetic analogs of rock samples containing connected and unconnected fluid-saturated fractures with well-constrained geometric characteristics. Using a low-frequency forced-oscillation apparatus, we show that the P-wave velocities are higher in samples with unconnected fractures than in those with connected ones. Complementary numerical simulations corroborate these findings and indicate that the dominant mechanism behind the observed differences is wave-induced fluid pressure diffusion within connected fractures. Our results provide direct experimental evidence that, for otherwise identical fracture networks, the presence of interconnectivity produces a measurable reduction in P-wave velocity at seismic frequencies, which is consistent with that previously predicted by corresponding numerical models. This, in turn, opens new and important perspectives for the seismo-hydraulic characterization of fractured rocks.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"59 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160280","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
Influence of tropical cyclones on organic aerosols in a coastal city of South China 热带气旋对华南沿海城市有机气溶胶的影响
IF 5.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2026-02-12 DOI: 10.1016/j.atmosres.2026.108861
Hongxing Jiang, Yuanhang Deng, Hai Guo, Yunxi Huo, Dawen Yao, Haoxian Lu, Changliu Wu, Meiyi Fan, Xiaopu Lyu, Fengwen Wang, Yan-Lin Zhang, Fan Zhang, Gehui Wang
{"title":"Influence of tropical cyclones on organic aerosols in a coastal city of South China","authors":"Hongxing Jiang, Yuanhang Deng, Hai Guo, Yunxi Huo, Dawen Yao, Haoxian Lu, Changliu Wu, Meiyi Fan, Xiaopu Lyu, Fengwen Wang, Yan-Lin Zhang, Fan Zhang, Gehui Wang","doi":"10.1016/j.atmosres.2026.108861","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.108861","url":null,"abstract":"","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"96 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Quantifying Changes in Water Loading in the U.S. Southwest via Comparison of GNSS, GRACE, and SWE Data Sets 通过GNSS、GRACE和SWE数据集的比较量化美国西南部水负荷的变化
IF 5.4 1区 地球科学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2026-02-12 DOI: 10.1029/2025wr040324
Kenneth C. Gourley, Richard A. Bennett, Christopher Harig
We use geodetic data to show that hydrologically distinct sub-regions in the Southwest United States act independently of one another. The limited number of Global Navigation Satellite System (GNSS) stations and resolution of Gravity Recovery and Climate Experiment (GRACE) make hydrological partitioning difficult to unravel, especially in the Colorado River Basin which comprises a diversity of climates due to its highly variable topography. Here, we compare GNSS station vertical displacement data, GRACE surface mass change data, and snow water equivalent (SWE) data using elastic surface displacement modeling and signal localization techniques. We focus on a region composed of Arizona, New Mexico, Colorado, and Utah, allowing for the examination of variations in the Colorado River Basin, the primary source of water for the region's municipalities, agriculture, and ecosystems. We demonstrate that the accumulation and melt of snow have a first-order control on the timing of vertical displacement in this region. There exists a region-dependent seasonal partitioning between when GNSS and GRACE sense changes in the distribution of terrestrial water storage. In the Wasatch Range of central Utah, GNSS stations sense loading due to changes in the snowpack one to 2 months in advance of GRACE; in the Southern Rocky Mountains of Colorado, GNSS stations sense loading due to changes in the snowpack one to 3 months in advance of GRACE; and in the lower Colorado River Basin of Arizona, GRACE senses loading due to changes in river runoff three or more months in advance of GNSS stations.
我们使用大地测量数据来显示美国西南部水文不同的子区域彼此独立地行动。全球导航卫星系统(GNSS)站点的数量有限,重力恢复和气候实验(GRACE)的分辨率有限,这使得水文分区难以解开,特别是在科罗拉多河流域,由于其高度多变的地形,该流域包括多种气候。在这里,我们使用弹性地表位移建模和信号定位技术比较了GNSS站垂直位移数据、GRACE地表质量变化数据和雪水当量(SWE)数据。我们将重点放在由亚利桑那州、新墨西哥州、科罗拉多州和犹他州组成的地区,允许检查科罗拉多河流域的变化,科罗拉多河流域是该地区市政、农业和生态系统的主要水源。研究表明,积雪的积累和融化对该地区垂直位移的时间具有一阶控制作用。GNSS和GRACE遥感的陆地储水量分布变化存在区域相关的季节分异。在犹他州中部的瓦萨奇山脉,GNSS站在GRACE之前一到两个月就能探测到积雪的变化;在科罗拉多州的南落基山脉,GNSS站在GRACE之前一到三个月就能感知积雪的变化;在亚利桑那州的科罗拉多河下游流域,GRACE比GNSS站提前三个月或更长时间感知到河流径流变化带来的负荷。
{"title":"Quantifying Changes in Water Loading in the U.S. Southwest via Comparison of GNSS, GRACE, and SWE Data Sets","authors":"Kenneth C. Gourley, Richard A. Bennett, Christopher Harig","doi":"10.1029/2025wr040324","DOIUrl":"https://doi.org/10.1029/2025wr040324","url":null,"abstract":"We use geodetic data to show that hydrologically distinct sub-regions in the Southwest United States act independently of one another. The limited number of Global Navigation Satellite System (GNSS) stations and resolution of Gravity Recovery and Climate Experiment (GRACE) make hydrological partitioning difficult to unravel, especially in the Colorado River Basin which comprises a diversity of climates due to its highly variable topography. Here, we compare GNSS station vertical displacement data, GRACE surface mass change data, and snow water equivalent (SWE) data using elastic surface displacement modeling and signal localization techniques. We focus on a region composed of Arizona, New Mexico, Colorado, and Utah, allowing for the examination of variations in the Colorado River Basin, the primary source of water for the region's municipalities, agriculture, and ecosystems. We demonstrate that the accumulation and melt of snow have a first-order control on the timing of vertical displacement in this region. There exists a region-dependent seasonal partitioning between when GNSS and GRACE sense changes in the distribution of terrestrial water storage. In the Wasatch Range of central Utah, GNSS stations sense loading due to changes in the snowpack one to 2 months in advance of GRACE; in the Southern Rocky Mountains of Colorado, GNSS stations sense loading due to changes in the snowpack one to 3 months in advance of GRACE; and in the lower Colorado River Basin of Arizona, GRACE senses loading due to changes in river runoff three or more months in advance of GNSS stations.","PeriodicalId":23799,"journal":{"name":"Water Resources Research","volume":"13 1","pages":""},"PeriodicalIF":5.4,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160934","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
High-Resolution Channel Geometry Reveals Contrasting Styles of Gravel River Adjustment 高分辨率河道几何揭示砾石河调整的不同风格
IF 5.2 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-12 DOI: 10.1029/2025gl118412
Robert P. Kostynick, Colin B. Phillips, Claire C. Masteller
Rivers self-organize to convey water and sediment, giving rise to robust downstream scaling between channel geometry and drainage area, underpinning landscape evolution models. However, these relations rely on limited observations per watershed. We quantify downstream changes in channel slope and bankfull width for six gravel rivers. We develop a novel method to automatically extract bankfull width and determine high-resolution (10-m), catchment-specific width-area scaling, revealing new insights on the covariation between slope and width hidden in large data compilations. We identify a threshold slope, below which average width is slope-independent. Notably, slope and width deviations display contrasting patterns depending on the channel's elevation profile. Deviations are anticorrelated when knickpoints are present and correlated when they are absent. High-resolution, catchment-specific scaling laws capture systematic, interpretable deviations reflecting underlying controls on channel adjustment and fluvial erosive power. With growing availability of high-resolution topography, our approach provides new insights into river process and form.
河流自组织输送水和沉积物,在河道几何形状和流域面积之间产生强大的下游尺度,支撑景观演化模型。然而,这些关系依赖于每个流域的有限观测。我们量化了6条砾石河流的河道坡度和堤岸宽度的下游变化。我们开发了一种新方法来自动提取河岸宽度并确定高分辨率(10米),流域特定的宽度-面积缩放,揭示了隐藏在大数据汇编中的坡度和宽度之间的协变的新见解。我们确定一个阈值斜率,低于该阈值的平均宽度与斜率无关。值得注意的是,坡度和宽度偏差显示出不同的模式,这取决于河道的高程剖面。当裂纹点存在时,偏差是反相关的,当它们不存在时,偏差是相关的。高分辨率、特定流域的标度定律捕获了系统的、可解释的偏差,反映了对河道调整和河流侵蚀力的潜在控制。随着高分辨率地形的日益可用性,我们的方法提供了对河流过程和形式的新见解。
{"title":"High-Resolution Channel Geometry Reveals Contrasting Styles of Gravel River Adjustment","authors":"Robert P. Kostynick, Colin B. Phillips, Claire C. Masteller","doi":"10.1029/2025gl118412","DOIUrl":"https://doi.org/10.1029/2025gl118412","url":null,"abstract":"Rivers self-organize to convey water and sediment, giving rise to robust downstream scaling between channel geometry and drainage area, underpinning landscape evolution models. However, these relations rely on limited observations per watershed. We quantify downstream changes in channel slope and bankfull width for six gravel rivers. We develop a novel method to automatically extract bankfull width and determine high-resolution (10-m), catchment-specific width-area scaling, revealing new insights on the covariation between slope and width hidden in large data compilations. We identify a threshold slope, below which average width is slope-independent. Notably, slope and width deviations display contrasting patterns depending on the channel's elevation profile. Deviations are anticorrelated when knickpoints are present and correlated when they are absent. High-resolution, catchment-specific scaling laws capture systematic, interpretable deviations reflecting underlying controls on channel adjustment and fluvial erosive power. With growing availability of high-resolution topography, our approach provides new insights into river process and form.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160277","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
Formation of Secondary Structures Associated With the Gradient Drift Instability in the High-Latitude Ionosphere 高纬度电离层中与梯度漂移不稳定性相关的次级结构的形成
IF 5.2 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-12 DOI: 10.1029/2025gl120134
Yusha Tan, Jiuhou Lei, Maodong Yan
The gradient drift instability (GDI) commonly occurs in the high-latitude ionosphere and is widely recognized for producing elongated striation structures. While previous studies have established the linear growth and primary nonlinear development of striations, the formation of secondary structures remains not fully understood. Using two-dimensional numerical simulations, we show that smaller branch structures evolve asymmetrically on the sides of striations when either the background electric field or the wave vector has a component along the density gradient. Our results indicate that in the linear stage, the electric field in the direction of density gradient modifies the effective growth rate by altering the wave vector orientation. In the nonlinear stage, electric field and wave vector direction coupling govern the emergence of branch structure, with electric field dominating when its effect opposes that of the wave vector. These results highlight the critical roles of electric field and wave vector orientation in generating secondary GDI structures.
梯度漂移不稳定性(GDI)通常发生在高纬度电离层,并被广泛认为是产生长条纹结构的原因。虽然前人的研究已经确定了条纹的线性生长和初级非线性发展,但对次级结构的形成尚未完全了解。利用二维数值模拟,我们发现当背景电场或波矢量沿密度梯度有分量时,较小的分支结构在条纹的侧面不对称地演化。结果表明,在线性阶段,密度梯度方向的电场通过改变波矢量方向来改变有效生长速率。在非线性阶段,电场与波矢量方向的耦合控制着分支结构的出现,当电场的作用与波矢量的作用相反时,电场占主导地位。这些结果强调了电场和波矢量方向在产生二次GDI结构中的关键作用。
{"title":"Formation of Secondary Structures Associated With the Gradient Drift Instability in the High-Latitude Ionosphere","authors":"Yusha Tan, Jiuhou Lei, Maodong Yan","doi":"10.1029/2025gl120134","DOIUrl":"https://doi.org/10.1029/2025gl120134","url":null,"abstract":"The gradient drift instability (GDI) commonly occurs in the high-latitude ionosphere and is widely recognized for producing elongated striation structures. While previous studies have established the linear growth and primary nonlinear development of striations, the formation of secondary structures remains not fully understood. Using two-dimensional numerical simulations, we show that smaller branch structures evolve asymmetrically on the sides of striations when either the background electric field or the wave vector has a component along the density gradient. Our results indicate that in the linear stage, the electric field in the direction of density gradient modifies the effective growth rate by altering the wave vector orientation. In the nonlinear stage, electric field and wave vector direction coupling govern the emergence of branch structure, with electric field dominating when its effect opposes that of the wave vector. These results highlight the critical roles of electric field and wave vector orientation in generating secondary GDI structures.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"10 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160285","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
Determining the origins of Phoenician silver: Exploring the potential of machine learning for lead isotope analysis 确定腓尼基银的起源:探索铅同位素分析机器学习的潜力
IF 2.8 1区 地球科学 Q1 ANTHROPOLOGY Pub Date : 2026-02-12 DOI: 10.1016/j.jas.2026.106499
Evgeny Shnyr, Tsvi Kuflik, Karan Desai, Tzilla Eshel
{"title":"Determining the origins of Phoenician silver: Exploring the potential of machine learning for lead isotope analysis","authors":"Evgeny Shnyr, Tsvi Kuflik, Karan Desai, Tzilla Eshel","doi":"10.1016/j.jas.2026.106499","DOIUrl":"https://doi.org/10.1016/j.jas.2026.106499","url":null,"abstract":"","PeriodicalId":50254,"journal":{"name":"Journal of Archaeological Science","volume":"6 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160348","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
期刊
全部 Geobiology Appl. Clay Sci. Geochim. Cosmochim. Acta J. Hydrol. Org. Geochem. Carbon Balance Manage. Contrib. Mineral. Petrol. Int. J. Biometeorol. IZV-PHYS SOLID EART+ J. Atmos. Chem. Acta Oceanolog. Sin. Acta Geophys. ACTA GEOL POL ACTA PETROL SIN ACTA GEOL SIN-ENGL AAPG Bull. Acta Geochimica Adv. Atmos. Sci. Adv. Meteorol. Am. J. Phys. Anthropol. Am. J. Sci. Am. Mineral. Annu. Rev. Earth Planet. Sci. Appl. Geochem. Aquat. Geochem. Ann. Glaciol. Archaeol. Anthropol. Sci. ARCHAEOMETRY ARCT ANTARCT ALP RES Asia-Pac. J. Atmos. Sci. ATMOSPHERE-BASEL Atmos. Res. Aust. J. Earth Sci. Atmos. Chem. Phys. Atmos. Meas. Tech. Basin Res. Big Earth Data BIOGEOSCIENCES Boundary Layer Meteorol. BOREAS Braz. J. Geol. B GEOSCI CAN GEOTECH J Bull. Seismol. Soc. Am. Can. Mineral. Bull. Am. Meteorol. Soc. Can. J. Earth Sci. Carbonates Evaporites Chem. Geol. Clim. Dyn. Clay Miner. Clays Clay Miner. Clim. Past CLIM RES Comput. Geosci. DEEP-SEA RES PT II Dokl. Earth Sci. Earth Surf. Processes Landforms EARTH PLANETS SPACE Earth Sci. Res. J. Econ. Geol. Earth Planet. Sci. Lett. Earth Sci. Rev. Eng. Geol. ELEMENTS Eur. J. Mineral. Front. Earth Sci. Geo-Mar. Lett. GEOFLUIDS Geophys. J. Int. Geophys. Res. Lett. Geocarto Int. Geog. Anal. GEOL CARPATH GEOL Q Gems Gemol. Geol. Mag. GEOCHEM PERSPECT LET Geosynth. Int. Geofis. Int. Geostand. Geoanal. Res. GEOLOGY Geosci. J. Geochem. J. Geochem. Trans. Geosci. Front. Geol. Ore Deposits Global Biogeochem. Cycles Gondwana Res. Geochem. Int. Geol. J. Geophys. Prospect. Geosci. Model Dev. GEOL BELG GROUNDWATER Hydrogeol. J. Hydrol. Earth Syst. Sci. Hydrol. Processes Int. J. Climatol. Int. J. Earth Sci.
×
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:604180095
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