Geophysical Research Letters最新文献_第6页

Micromechanical Insights Into the Cyclic Behavior of Fault-Valve Systems 故障阀系统循环行为的微观力学见解

IF 5 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-15 DOI: 10.1029/2026GL124845

Oussama Larkem, Luc Scholtès, Fabrice Golfier

{"title":"Micromechanical Insights Into the Cyclic Behavior of Fault-Valve Systems","authors":"Oussama Larkem, Luc Scholtès, Fabrice Golfier","doi":"10.1029/2026GL124845","DOIUrl":"https://doi.org/10.1029/2026GL124845","url":null,"abstract":"Cyclic fluid pressurization can promote repeated fault reactivation and transient permeability changes, a behavior often discussed within the fault-valve concept in which faults alternate between acting as hydraulic barriers and conduits. To investigate the micromechanical processes involved during fluid induced reactivations, we simulate cyclic fluid injection into a pre-sheared granular gouge using a discrete element model. The simulations reproduce key behaviors observed in laboratory and in situ studies and reveal pronounced cycle-to-cycle variability in the onset of reactivation and slip magnitude. Some cycles generate large slip episodes, whereas others produce comparatively small slip under similar loading conditions. Micromechanical analysis of force-chain evolution reveals a strong inverse correlation between slip magnitude and the population of load-bearing chains, with sparser force-chain backbones generating larger slip events. Our results highlight the role of micromechanical processes in controlling macroscopic cyclic fault behavior, offering a physically grounded perspective on fault-valve behavior.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"53 20","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GL124845","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149177542","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

Multidecadal Changes in Atmospheric Dryness Over East Asia Dominated by Internal Climate Variability 内部气候变率主导的东亚大气干燥的多年代际变化

IF 5 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-15 DOI: 10.1029/2026GL125508

Xi Wang, Wenjian Hua, Aiguo Dai, Lu Zhou, Minhua Qin, Haishan Chen

引用次数: 0

Long-Term Increase in Equatorial Rayleigh-Taylor Instability: Synergistic Effects of Greenhouse Gas Cooling and Geomagnetic Field Secular Variation 赤道瑞利-泰勒不稳定性的长期增加：温室气体冷却和地磁场长期变化的协同效应

IF 5 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-15 DOI: 10.1029/2026GL124993

Liying Qian, Chih-Ting Hsu, Wenbin Wang, Shun-Rong Zhang, Joseph McInerney

{"title":"Long-Term Increase in Equatorial Rayleigh-Taylor Instability: Synergistic Effects of Greenhouse Gas Cooling and Geomagnetic Field Secular Variation","authors":"Liying Qian, Chih-Ting Hsu, Wenbin Wang, Shun-Rong Zhang, Joseph McInerney","doi":"10.1029/2026GL124993","DOIUrl":"https://doi.org/10.1029/2026GL124993","url":null,"abstract":"Equatorial plasma bubbles (EPBs) are ionospheric irregularities generated by Rayleigh–Taylor instability (RTI) that disrupt satellite communications. We quantify secular change of RTI growth rates and isolate underlying drivers using WACCM-X simulations. Results reveal a significant increase in RTI growth rates at plasma bubble initiation altitudes, with greenhouse gas cooling as the dominant driver and geomagnetic field secular variation modulating trends by longitude. We identify reduced recombination damping, often overlooked, as a major contributor. In the American/western sector, magnetic field secular variation produces localized decreases in RTI growth rates for magnetic field lines with apex altitudes of ∼250–320 km but predominantly enhances RTI growth rates for field lines with higher apex altitudes. Note that EPBs are initiated at the bottom F2 region, regardless of apex altitudes of field lines. Overall, the equatorial ionosphere is becoming more susceptible to RTI and plasma bubble development through stronger forcing and weaker damping.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"53 20","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GL124993","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149177541","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

No Evidence for Strongly Enhanced Northern Hemisphere Cooling From Extratropical Versus Tropical Eruptions 没有证据表明温带火山喷发与热带火山喷发会强烈增强北半球的降温

IF 5 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-15 DOI: 10.1029/2026GL122071

Zachary McGraw, Benjamin O. Goldman, Lorenzo M. Polvani

引用次数: 0

Potential Benefits of Assimilating Phased Array Radar Data for Convective‐Scale Analysis and Prediction of Supercell Storms: A Proof‐of‐Concept OSSE Study 同化相控阵雷达数据对对流尺度分析和超级单体风暴预测的潜在好处：一项概念验证OSSE研究

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-15 DOI: 10.1029/2026gl125172

Jidong Gao,Derek R. Stratman

{"title":"Potential Benefits of Assimilating Phased Array Radar Data for Convective‐Scale Analysis and Prediction of Supercell Storms: A Proof‐of‐Concept OSSE Study","authors":"Jidong Gao,Derek R. Stratman","doi":"10.1029/2026gl125172","DOIUrl":"https://doi.org/10.1029/2026gl125172","url":null,"abstract":"Abstract This study investigates the impact of phased array radar (PAR) scanning strategies on short‐term convective‐scale analyses and forecasts through an Observing System Simulation Experiment framework. The Weather Research and Forecasting model, coupled with the Data Assimilation Research Testbed ensemble adjustment Kalman filter, is used to assimilate synthetic radar observations from PAR and WSR‐88D scanning strategies across three idealized supercell cases: slow‐moving, fast‐moving, and fast‐moving/fast‐growing storms. For the slow‐moving storm, PAR and WSR‐88D experiments produce comparable analyses and forecasts, with only marginal improvement from PAR. In contrast, for fast‐moving and fast‐growing storms, the 5‐min WSR‐88D scan introduces substantial temporal errors associated with storm advection and evolution, resulting in distorted storm structure. The rapid 1‐min update capability of PAR significantly reduces these errors, producing superior analyses and forecasts. These findings suggest that the implementation of a future US national PAR network would substantially enhance the accuracy of short‐term severe weather forecasts.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"86 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209635","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

Observation of Daily Flood Hazard During the SWOT Cal/Val Orbit SWOT Cal/Val轨道日洪水灾害观测

IF 5 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-15 DOI: 10.1029/2026GL124074

Yukina Hara, Dai Yamazaki, Megumi Watanabe, Colin J. Gleason, Shinjiro Kanae

引用次数: 0

Assimilation of 5G Base Station Networks as Ultra‐Dense Atmospheric Sensors for Advancing Heavy Rainfall Prediction 5G基站网络同化作为超密集大气传感器用于推进强降雨预报

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-14 DOI: 10.1029/2026gl124477

Jian Yin,Xiefei Zhi,Danni Huang,Chunqing Shang,Hong Liang,Kezuan Wang

引用次数: 0

Superpiles: The Impact of Mantle Temperature on Large Low Velocity Provinces 叠桩：地幔温度对大低速道的影响

IF 5 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-14 DOI: 10.1029/2026GL126324

Heidi N. Krauss, Allen K. McNamara

引用次数: 0

Position of the Lhasa Terrane and Two-Stage Crustal Shortening During the India–Asia Collision 印度-亚洲碰撞期间拉萨地体位置与两期地壳缩短

IF 5 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-14 DOI: 10.1029/2026GL124529

Zhenhua Jia, Pan Zhao, Yifei Hou, Yue Liu, Siyuan Li, Jiahui Ma, Chenglong Deng

{"title":"Position of the Lhasa Terrane and Two-Stage Crustal Shortening During the India–Asia Collision","authors":"Zhenhua Jia, Pan Zhao, Yifei Hou, Yue Liu, Siyuan Li, Jiahui Ma, Chenglong Deng","doi":"10.1029/2026GL124529","DOIUrl":"https://doi.org/10.1029/2026GL124529","url":null,"abstract":"The paleolatitudinal change of the Lhasa Terrane is critical for estimating the timing of the India–Asia collision and associated syn-to post-collisional crustal shortening, but its paleoposition is highly debated. Here we present integrated geochronologic and paleomagnetic results from the Lower Eocene Nianbo Formation in the Linzhou Basin. Two SIMS U−Pb zircon ages of 54.59 ± 0.68 Ma and 53.97 ± 0.43 Ma were obtained from the strata. The magnetostratigraphy spans chrons C24r–C23r, estimating deposition from ∼55.37 to ∼52.54 Ma. Paleomagnetic data yield a paleopole of 74.1°N, 270.1°E (A95 = 2.2°) for the Lhasa Terrane, corresponding to a paleolatitude of 14.1 ± 2.2°N. Synthesis of published paleomagnetic data reveals that the Lhasa Terrane migrated from ∼10°N (Late Cretaceous) to ∼14°N (Early Eocene), and reached ∼20°N at ∼50 Ma. This two-stage latitudinal shift implies two-stage crustal shortening, which might relate to the Tethyan Himalaya–Lhasa collision and the India–Asia collision, respectively.","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/10.1029/2026GL124529","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176982","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

Convective Amplification of Ionospheric Feedback by a Finite‐Duration Inertial Alfvén‐Wave Source 有限持续时间惯性alfvsamn -波源对电离层反馈的对流放大

IF 5.2 1区地球科学

Geophysical Research Letters Pub Date : 2026-10-14 DOI: 10.1029/2026gl124490

R. Rankin,W. Wang,Q.‐G. Zong

引用次数: 0