Geophysical Research Letters最新文献_第7页

Investigating Postseismic Creep in the Laboratory: Testing Dislocation-Based Models for Transient Creep in the Upper Mantle 在实验室研究地震后蠕变：测试基于位错的上地幔瞬态蠕变模型

IF 5 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-14 DOI: 10.1029/2026GL124424

D. Hein, L. N. Hansen, A. Dillman

{"title":"Investigating Postseismic Creep in the Laboratory: Testing Dislocation-Based Models for Transient Creep in the Upper Mantle","authors":"D. Hein, L. N. Hansen, A. Dillman","doi":"10.1029/2026GL124424","DOIUrl":"https://doi.org/10.1029/2026GL124424","url":null,"abstract":"Studies of postseismic creep often infer a strong reduction in upper-mantle viscosity after large earthquakes, yet the microphysical mechanism responsible for this behavior remains subject of debate. Here, we present new gas-medium apparatus experiments at 1100–1200°C on pre-dried, annealed Åheim dunite (grain size of 400 <math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>μ</mi>\u0000 </mrow>\u0000 <annotation> ${upmu }$</annotation>\u0000 </semantics></math>m) designed to elucidate the microphysical mechanism of transient dislocation creep during postseismic relaxation. We demonstrate that the transient mechanical behavior of dunite matches well with predictions of an intragranular model that involves the evolution of dislocation density and long-range interactions among dislocations. Extrapolation to upper-mantle conditions illustrates that this model can also explain the 1–2 orders of magnitude reduction in upper-mantle viscosity that is inferred from studies of postseismic creep. We highlight opportunities to refine both intra- and intergranular models of transient dislocation creep.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"53 20","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GL124424","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149177309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quasi‐Homologous Solar Flares and Impacts on Thermospheric Density and Satellite Orbital Drag 准同源太阳耀斑及其对热层密度和卫星轨道阻力的影响

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-14 DOI: 10.1029/2026gl125768

S. Tulasi Ram,Princy K. Dubey,S. Mondal,Denny M. Oliveira,Jayashree Bulusu,Chinmaya Nayak,D. Rout,Anil Raghav,A. P. Dimri

引用次数: 0

Changes in Flood Frequency and Seasonality Across Midwestern U.S. Watersheds Under a Warming Climate: Insights From Convection‐Permitting Climate Simulations and Physics‐Based Hydrologic Models 气候变暖下美国中西部流域洪水频率和季节性的变化：对流允许的气候模拟和基于物理的水文模型的见解

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-14 DOI: 10.1029/2026gl124622

Mohammad Abbasian,Daniel B. Wright,Michael Notaro,Steve Vavrus,Daniel J. Vimont

{"title":"Changes in Flood Frequency and Seasonality Across Midwestern U.S. Watersheds Under a Warming Climate: Insights From Convection‐Permitting Climate Simulations and Physics‐Based Hydrologic Models","authors":"Mohammad Abbasian,Daniel B. Wright,Michael Notaro,Steve Vavrus,Daniel J. Vimont","doi":"10.1029/2026gl124622","DOIUrl":"https://doi.org/10.1029/2026gl124622","url":null,"abstract":"Abstract We combine CONUS404 convection‐permitting climate simulations with the physics‐based WRF‐Hydro model to assess how climate warming may influence flood frequency and seasonality across the Midwestern United States. This framework captures interactions among precipitation, soil moisture, and snowpack that shape flood generation. Both simulated warming and historical records show a regional shift toward more extreme warm‐season, rainfall‐driven floods. This regional signal, however, does not translate uniformly to individual watersheds, where flood responses reflect not only warming but also the influence of subregional climate variability and sampling uncertainty. Local flood‐frequency changes thus remain highly uncertain despite the thermodynamic tendency toward stronger convective precipitation. Ensembles of convection‐permitting simulations are needed to constrain plausible local outcomes. These findings suggest that flood risk communication under climate warming should distinguish broad climate‐driven tendencies from uncertain local responses.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"130 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209653","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

Correcting Unwrapping Errors Toward Reliable Rock Glacier Velocity From InSAR Time Series 从InSAR时间序列修正解包裹误差，获得可靠的岩石冰川速度

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-13 DOI: 10.1029/2026gl124711

Mengze Li,Lin Liu,Chengyan Fan,Reynald Delaloye,Zhangyu Sun,Line Rouyet

引用次数: 0

An Improved Dust Emission Modeling With Multiple Endmember Spectral Mixture Analysis 基于多端元光谱混合分析的改进尘埃发射模型

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-13 DOI: 10.1029/2026gl125044

Qidi Pan,Junran Li,Qiangqiang Sun,Danfeng Sun,Jinbao Li,Heqiang Du,Huijie Xiao,Huixin Zhu,Lexin Li

引用次数: 0

Impacts of Sea Surface Temperature Warming Pattern Biases on Tropical Cyclone Activity and Hazard 海温增温型偏置对热带气旋活动和危害的影响

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-13 DOI: 10.1029/2026gl124022

Jing‐Yi Zhuo,Chia‐Ying Lee,Suzana J. Camargo,Adam H. Sobel,Gabriel A. Vecchi

引用次数: 0

The 2 May 2025 Mw 7.4 Drake Passage Earthquake: Insights Into Tectonics at the Shackleton Fracture Zone–Chilean Trench Transition 2025年5月2日的7.4毫瓦德雷克通道地震：对沙克尔顿断裂带-智利海沟过渡构造的见解

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-13 DOI: 10.1029/2026gl122178

A. Vuan,G. Brancatelli,G. Brancolini,L. Gasperini,R. Geletti,E. Lodolo,A. Magrin,M. Menichetti,M. Plasencia,A. Polonia,M. Santulin,A. Tassone

{"title":"The 2 May 2025 Mw 7.4 Drake Passage Earthquake: Insights Into Tectonics at the Shackleton Fracture Zone–Chilean Trench Transition","authors":"A. Vuan,G. Brancatelli,G. Brancolini,L. Gasperini,R. Geletti,E. Lodolo,A. Magrin,M. Menichetti,M. Plasencia,A. Polonia,M. Santulin,A. Tassone","doi":"10.1029/2026gl122178","DOIUrl":"https://doi.org/10.1029/2026gl122178","url":null,"abstract":"Abstract On 2 May 2025, an Mw 7.4 earthquake occurred ∼120 km off the southern tip of Tierra del Fuego, at the transition of the Shackleton Fracture Zone and the Chile Trench. This event exhibits reverse‐faulting mechanisms with relatively steeply dipping planes and is the largest recorded along this complex plate boundary. Most aftershocks have similar mechanisms, although some show strike‐slip and normal faulting. To better resolve the activated fault system under limited station coverage, we relocated events and incorporated pP‐sP phases identified using a trained classifier to refine focal depths. A multichannel seismic reflection line provides additional insights into the structure of the subduction complex. We infer that the mainshock nucleated on the subduction interface or within the plate of the southernmost Chilean subduction system, with aftershocks marking activation of steeper structures. This behavior emphasizes how convergent and strike‐slip fault systems interact to complicate earthquake rupture at plate boundary transitions.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209657","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

A Generalized Analytical Model for Marine Gas Hydrate Stability Zones With Thermodynamically Constrained Pressure–Temperature Phase Boundary 具有热力学约束压力-温度-相边界的海洋天然气水合物稳定带广义解析模型

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-13 DOI: 10.1029/2026gl125255

Haibing Yu,Xin Luo

{"title":"A Generalized Analytical Model for Marine Gas Hydrate Stability Zones With Thermodynamically Constrained Pressure–Temperature Phase Boundary","authors":"Haibing Yu,Xin Luo","doi":"10.1029/2026gl125255","DOIUrl":"https://doi.org/10.1029/2026gl125255","url":null,"abstract":"Abstract Accurate thermodynamic delineation of marine gas hydrate stability zones (GHSZs) is a fundamental prerequisite for assessing methane hydrate inventories, quantifying the vulnerability of methane dissociation to climate change, and evaluating overpressure‐induced submarine geohazards. However, the commonly adopted pressure–temperature phase boundaries are predominantly calibrated under idealized conditions and fail to capture natural marine conditions, leading to persistent uncertainties and systematic biases in global GHSZ delineation. Here, we assemble a globally representative dataset of field‐constrained hydrate records to refine and calibrate a thermodynamically constrained phase boundary tailored to natural marine environments. The resulting field‐calibrated phase boundary features clear physical interpretability, robust extrapolation reliability, and enables the GHSZ boundary depth to be calculated directly using an explicit closed‐from analytical solution. The analytical model delineates thermodynamically admissible GHSZ configurations and is validated against global observations for the prevalent single basal‐interface case, providing an efficient framework for regional‐to‐global hydrate‐related assessments.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"1 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209683","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

Seawall‐Induced Isolation Alters Hydrological‐Biogeochemical Conditions in Coastal Wetlands 海堤诱导的隔离改变了沿海湿地的水文-生物地球化学条件

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-13 DOI: 10.1029/2026gl125301

Bingnan Zhao,Zhijun Dai,Xixing Liang,Wensheng Zhang,Fangbing Xu,Xuefei Mei,Sergio Fagherazzi

{"title":"Seawall‐Induced Isolation Alters Hydrological‐Biogeochemical Conditions in Coastal Wetlands","authors":"Bingnan Zhao,Zhijun Dai,Xixing Liang,Wensheng Zhang,Fangbing Xu,Xuefei Mei,Sergio Fagherazzi","doi":"10.1029/2026gl125301","DOIUrl":"https://doi.org/10.1029/2026gl125301","url":null,"abstract":"Abstract Coastal wetlands are increasingly impacted by tropical cyclones and storm surges. Seawalls and levees built to reduce these hazards disconnect wetlands from adjacent uplands, yet their hydroecological effects remain poorly understood. Using continuous hydrological observations in Chongming Island, Changjiang Estuary, China, we compared seaward and landward wetlands separated by a seawall. CTD sensor data, water quality measurements, and plot surveys revealed that seawall construction weakens tidal connectivity and reduces hydrological exchange landward. Seaward wetlands exhibit tidal‐dominated dynamics with higher salinity and lower chlorophyll (CHL), chemical oxygen demand (COD), and total organic carbon (TOC), associated with presence of Phragmites australis . Interior wetlands show reduced salinity, higher values of CHL, COD and TOC, stronger rainfall‐driven responses, and are characterized by more terrestrial vegetation species. These findings suggest that seawalls can substantially alter wetland hydrodynamics and ecosystem structure, highlighting the importance of incorporating hydrological connectivity into seawall design to sustain wetland functions.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"32 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209655","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

A Hybrid Superdroplet–Bin Microphysics Approach Reveals How Large Salt Particles Trigger Rain in Non-Precipitating Warm Convective Clouds 一种混合的超级液滴-桶微物理方法揭示了大盐颗粒如何在非降水的暖对流云中引发降雨

IF 5 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-13 DOI: 10.1029/2026GL125603

Shaofeng Hua, Baojun Chen, Jing Yang, Shujing Shen, Weiguo Liu, Yueqin Shi, Yubao Liu, Ping Tian, Xijing Liu, Yunfei Che

{"title":"A Hybrid Superdroplet–Bin Microphysics Approach Reveals How Large Salt Particles Trigger Rain in Non-Precipitating Warm Convective Clouds","authors":"Shaofeng Hua, Baojun Chen, Jing Yang, Shujing Shen, Weiguo Liu, Yueqin Shi, Yubao Liu, Ping Tian, Xijing Liu, Yunfei Che","doi":"10.1029/2026GL125603","DOIUrl":"https://doi.org/10.1029/2026GL125603","url":null,"abstract":"This study develops a Superdroplet-Bin hybrid microphysics scheme within the Weather Research and Forecasting (WRF) model to investigate hygroscopic seeding of warm convective clouds. The Super-droplet method describes 3D transport, deliquescence, condensation, and collision-coalescence growth of seeding agents or solution droplets, while the spectral bin method simulates liquid-phase processes. Idealized simulations indicate that seeding full-spectrum salt near cloud base can produce a maximum accumulated precipitation of 11.59 mm in 3 h. Further sensitivity experiments on seeding particle size reveal that rainfall enhancement primarily originates from particles ≥4 μm, with 5 μm yielding the most pronounced effect. This is because particles ≥4 μm can nucleate to form droplets ≥20 μm, shifting collision-coalescence from the low-efficiency regime below 20 μm to the high-efficiency regime between large and drizzle-sized droplets. The tail and rain-embryo effects are identified as the dominant mechanisms, competition alone cannot effectively broaden the droplet spectrum or trigger precipitation.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"53 20","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GL125603","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149177029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0