Geophysical Research Letters最新文献_第7页

Meltwater-Induced Lake Freshening and Muted Warming in Northern China Under Contemporary Global Warming

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-25 DOI: 10.1029/2024GL112819

Jiawei Jiang, Bowen Meng, Aifeng Zhou, Rong Chen, Cheng Zhao, Zhouqing Xie, Huanye Wang, Weiguo Liu, Zhonghui Liu, Peng Gong

引用次数: 0

A New Approach to Constrain Crustal Vp/Vs From Rayleigh Wave Phase Velocity and Local Amplification: Application to the Western US 从瑞利波相位速度和局部放大率推测地壳 Vp/Vs 的新方法：在美国西部的应用

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-24 DOI: 10.1029/2024GL111980

Yiran Huang, Colleen A. Dalton, Anant Hariharan

引用次数: 0

Projected Antarctic Land Warming and Uncertainty Driven by Atmospheric Heat Transport

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-24 DOI: 10.1029/2025GL114630

Yihan Zhang, Xiaoming Hu, Peixi Wang, Song Yang

{"title":"Projected Antarctic Land Warming and Uncertainty Driven by Atmospheric Heat Transport","authors":"Yihan Zhang, Xiaoming Hu, Peixi Wang, Song Yang","doi":"10.1029/2025GL114630","DOIUrl":"10.1029/2025GL114630","url":null,"abstract":"A significant warming is projected in Antarctic climate change under high CO2 forcing, involving complex interactions between ocean and land surfaces. While previous studies have emphasized the seasonal mechanism driving Antarctic ocean surface warming, the processes governing land surface warming remain less explored. Here we show that, under abrupt quadrupled CO2 forcing, Antarctic land surface experiences uniform warming throughout the year, primarily driven by poleward atmospheric heat transport, with latent energy transport playing a dominant role. This moisture-related transport not only delivers energy but also amplifies the water vapor feedback, significantly contributing to the warming. Our findings suggest that the discrepancies in representing these atmospheric processes across models, contribute substantially to the uncertainties in Antarctic land surface warming projections. The result emphasizes the need for improved understanding of the atmospheric dynamics in polar regions to reduce model uncertainties under future climate scenarios.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 6","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL114630","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678248","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

Energetic Compact Strokes as the Major Source of Downward Terrestrial Gamma-Ray Flashes in Winter Thunderstorms

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-24 DOI: 10.1029/2024GL113194

Ting Wu, David M. Smith, Yuuki Wada, Kazuhiro Nakazawa, Manari Oguchi, Masashi Kamogawa, Tomoyuki Suzuki, Qingliu Yang, Daohong Wang

{"title":"Energetic Compact Strokes as the Major Source of Downward Terrestrial Gamma-Ray Flashes in Winter Thunderstorms","authors":"Ting Wu, David M. Smith, Yuuki Wada, Kazuhiro Nakazawa, Manari Oguchi, Masashi Kamogawa, Tomoyuki Suzuki, Qingliu Yang, Daohong Wang","doi":"10.1029/2024GL113194","DOIUrl":"10.1029/2024GL113194","url":null,"abstract":"Terrestrial gamma-ray flashes (TGFs) are short bursts of intense gamma radiation associated with lightning discharges. Although thousands of TGFs have been observed from space, TGFs detected at ground level, known as downward TGFs, are still very limited, and their relationship with lightning discharge processes remains elusive. Here we report a special type of strong negative lightning stroke, termed energetic compact stroke (ECS), in winter thunderstorms in Japan, and provide strong evidence that ECSs are consistently associated with downward TGFs. Based on this relationship, we successfully identified three new downward TGFs by the observations of ECSs. Further, 12 out of 19 (63%) of downward TGFs analyzed in this paper were associated with ECSs, indicating that ECSs are the major source of downward TGFs in winter thunderstorms in Japan. These findings open up the possibility of remotely monitoring a large fraction of downward TGFs with simple lightning observations.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 6","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL113194","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678245","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

An Empirical Parameterization to Separate Coarse and Fine Mode Aerosol Optical Depth Over Land

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-24 DOI: 10.1029/2024GL114397

Xiaohan Li, Paul Ginoux

引用次数: 0

Shear-Layer Thickness and Structure Evolves With Effective Stress in Subglacial Environments

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-24 DOI: 10.1029/2024GL114109

Ian Madden, Dougal D. Hansen, Lucas K. Zoet, Jenny Suckale

{"title":"Shear-Layer Thickness and Structure Evolves With Effective Stress in Subglacial Environments","authors":"Ian Madden, Dougal D. Hansen, Lucas K. Zoet, Jenny Suckale","doi":"10.1029/2024GL114109","DOIUrl":"10.1029/2024GL114109","url":null,"abstract":"Moving glaciers shear and deform the subglacial till beneath them, with deformation concentrated in a thin shear-layer. This shear-layer's properties are partially controlled by effective stress, which depends on ice thicknesses and subglacial hydrological networks. Understanding the relationship between effective stress and shear-layer thickness helps characterize basal resistance to ice motion and inform subglacial landform formation. While experiments agree increasing effective stresses beget decreasing shear-layer thicknesses at high effective stresses, a trend is unclear at low effective stresses. Continuum models predict that increased effective stresses yield increasing shear-layer thicknesses, inconsistent with experiments. Here, we identify how properties of a medium's persistent contact network lead to non-monotonic shear-layer thicknesses in effective stress through Discrete Element Method simulations. We find effective stress can alter both shear-layer thickness and structure, and thereby depth-averaged friction. We integrate these insights into an existing continuum model by modifying its yield parameters, resolving inconsistency between model and experiment.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 6","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL114109","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678254","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

Collapse of the Atlantic Meridional Overturning Circulation in a Strongly Eddying Ocean-Only Model

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-24 DOI: 10.1029/2024GL114532

René M. van Westen, Michael Kliphuis, Henk A. Dijkstra

{"title":"Collapse of the Atlantic Meridional Overturning Circulation in a Strongly Eddying Ocean-Only Model","authors":"René M. van Westen, Michael Kliphuis, Henk A. Dijkstra","doi":"10.1029/2024GL114532","DOIUrl":"10.1029/2024GL114532","url":null,"abstract":"A collapse of the Atlantic Meridional Overturning Circulation (AMOC) under a quasi-equilibrium freshwater forcing has now been found in a hierarchy of ocean-climate models and up to a fully-coupled climate model, the Community Earth System Model (CESM). However, the effects of eddies on the ocean flows are represented in a highly idealized way in the CESM and it is unknown how these affect AMOC stability. Here, we show results of the first quasi-equilibrium hosing simulation with a strongly eddying ocean-only model in which the AMOC collapses. By comparing these results to those of a companion non-eddying simulation with the same model, it is found that eddies are able to maintain a weak (<math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 </mrow>\u0000 <annotation> ${sim} $</annotation>\u0000 </semantics></math>5 Sv) AMOC flow in the collapsed state. In addition, we find that the AMOC induced freshwater transport at 34<math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>°</mo>\u0000 </mrow>\u0000 <annotation> ${}^{circ}$</annotation>\u0000 </semantics></math>S is a reliable physics-based early warning indicator for the onset of the AMOC collapse.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 6","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL114532","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678253","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

Thermobaric Activation of Fault Friction

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-23 DOI: 10.1029/2024GL112959

S. Barbot, S. E. Guvercin, L. Zhang, H. Zhang, Z. Yang

引用次数: 0

A Machine Learning Tool for Determining the Required Sample Size for GEV Fitting in Climate Applications

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-23 DOI: 10.1029/2024GL112737

R. J. Matear, P. Jyoteeshkumar Reddy

{"title":"A Machine Learning Tool for Determining the Required Sample Size for GEV Fitting in Climate Applications","authors":"R. J. Matear, P. Jyoteeshkumar Reddy","doi":"10.1029/2024GL112737","DOIUrl":"10.1029/2024GL112737","url":null,"abstract":"Extreme climate events (ECEs) like heavy rainfall and heatwaves significantly impact society, and climate change is altering their magnitude and frequency. Generalized Extreme Value (GEV) distributions help quantify these ECEs and guide human system design. We train a machine learning (ML) model using a set of arbitrary GEV distributions to estimate the sample size required to determine a return value with specific uncertainty. For ECEs like heatwaves with a negative GEV shape parameter the maximum extreme temperatures of heatwaves are bounded and fewer samples are needed to estimate the return value to given uncertainty than rainfall extremes which have positive shape parameter with unbounded extreme values. For example, if a 1-in-20-year heatwave event requires 400 samples to estimate return value to <math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>±</mo>\u0000 </mrow>\u0000 <annotation> $pm $</annotation>\u0000 </semantics></math>1% uncertainty, one would need 20 different 20-year simulations. Achieving such quantities will require extensive climate downscaling simulations, potentially aided by ML-based downscaling methods to increase the ensemble size.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 6","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112737","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678251","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

Vegetation-Driven Spatial Heterogeneity of Land Surface Temperature Changes on the Chinese Loess Plateau

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-03-23 DOI: 10.1029/2024GL112555

H. X. Lu, W. G. Liu, Z. H. Liu, Y. B. Sun, H. Y. Wang, Z. Wang, J. B. Dong, M. Xing, S. G. Kang, H. Liu, X. Liu, W. J. Sheng, Y. N. Cao, J. Hu

{"title":"Vegetation-Driven Spatial Heterogeneity of Land Surface Temperature Changes on the Chinese Loess Plateau","authors":"H. X. Lu, W. G. Liu, Z. H. Liu, Y. B. Sun, H. Y. Wang, Z. Wang, J. B. Dong, M. Xing, S. G. Kang, H. Liu, X. Liu, W. J. Sheng, Y. N. Cao, J. Hu","doi":"10.1029/2024GL112555","DOIUrl":"10.1029/2024GL112555","url":null,"abstract":"A comprehensive understanding of the processes and mechanisms driving Holocene temperature changes is crucial for resolving the ongoing Holocene temperature controversy. Here, we reconstructed land surface temperature (LST) variations over the past 27,000 years in two loess-paleosol profiles from the Chinese Loess Plateau based on soil bacterial lipid signatures. By combining our data with other published records derived from the same proxy, we identify notable spatial inconsistencies in LST trends across geographically proximate areas with distinct vegetation cover, despite the expectation that air temperature trends should be consistent. By integrating modern meteorological data, we propose that rainfall-induced changes in surface vegetation dynamics are a key factor contributing to this divergence. This contributes to our understanding of past climate dynamics in East Asia and underscores the importance of considering vegetation effects when interpreting paleoclimate data and resolving controversies over Holocene temperature trends.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 6","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112555","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678246","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