Geophysical Research Letters最新文献_第8页

Observed Ionospheric Tidal Response to the Madden-Julian Oscillation 观测到的电离层潮汐对麦登-朱利安涛动的响应

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-24 DOI: 10.1029/2025GL115481

Deepali Aggarwal, Jens Oberheide, Komal Kumari

{"title":"Observed Ionospheric Tidal Response to the Madden-Julian Oscillation","authors":"Deepali Aggarwal, Jens Oberheide, Komal Kumari","doi":"10.1029/2025GL115481","DOIUrl":"10.1029/2025GL115481","url":null,"abstract":"The Madden-Julian Oscillation (MJO) is the dominant mode of intraseasonal variability in the tropical troposphere and known to affect the tidal activity in the mesosphere and lower thermosphere (MLT). Using Constellation Observing System for Meteorology, Ionosphere, and Climate-2 (COSMIC-2) Global Ionospheric Specification electron density data, we show that the MJO impact extends into the F-region ionosphere. The MJO imposes an average amplitude variability of <math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 </mrow>\u0000 <annotation> ${sim} $</annotation>\u0000 </semantics></math>15% in the non-migrating diurnal tide (DE3) and 2%–5% for the migrating diurnal tide (DW1), with significant responses observed in other diurnal and semidiurnal tidal components. Sounding of the Atmosphere using Broadband Emission Radiometry MLT temperature tides shows no time lag to COSMIC-2. E-region dynamo is thus the likely the main mechanism that couples the MJO into the ionosphere. Magnitude and ubiquity of the ionospheric MJO signal underlines the relevance of recurring tropospheric weather patterns for understanding the space weather of the ionosphere.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 18","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL115481","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127380","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

Coupled Geomechanical and Thermodynamic Controls on Global Distribution and Morphology of Gas Hydrate in Clay-Rich Marine Sediments 富粘土海相沉积物中天然气水合物全球分布和形态的地质力学和热力学耦合控制

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-24 DOI: 10.1029/2025GL116985

Wei Deng, Zenggui Kuang, Hugh Daigle, Wei Zhang, Xiujuan Wang, Pin Yan, Miaomiao Meng, Yingfeng Xie

{"title":"Coupled Geomechanical and Thermodynamic Controls on Global Distribution and Morphology of Gas Hydrate in Clay-Rich Marine Sediments","authors":"Wei Deng, Zenggui Kuang, Hugh Daigle, Wei Zhang, Xiujuan Wang, Pin Yan, Miaomiao Meng, Yingfeng Xie","doi":"10.1029/2025GL116985","DOIUrl":"10.1029/2025GL116985","url":null,"abstract":"∼90% of gas hydrates occur as pore-filling or fracture-filling morphology in clay-rich marine sediments. Their dissociation releases gas with distinct environmental fates interacting with climate change. A well-constrained model of hydrate distribution with different morphologies is urgently needed. We present a novel one based on drilling data worldwide. We identified a geomechanics-controlled critical depth, typically several hundred meters below the seafloor, which limits the maximum occurrence depth of fracture-filling hydrates. This relative positioning of critical depth and bottom of the gas hydrate stability zone (BGHSZ) determines hydrate distribution with various morphologies: pore-filling hydrates develop and predominate below critical depth only when critical depth lies above BGHSZ, while only fracture-filling hydrates occur above BGHSZ when critical depth exceeds BGHSZ. Critical depth increases with higher clay-sized fractions or water depths, causing varying hydrate morphologies at specific depths along continental margins. This model is essential for evaluating hydrates' roles in global carbon cycle.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 18","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL116985","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127379","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

Global Increases in Dry-Wet Abrupt Alternation Events Under Climate Change 气候变化下全球干湿突变事件的增加

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-24 DOI: 10.1029/2025GL117322

Nan He, Jiabo Yin, Pan Liu, Xiang Fu, Qian Zhang, Lei Cheng, Simon Moulds, Aliaksandr Volchak

{"title":"Global Increases in Dry-Wet Abrupt Alternation Events Under Climate Change","authors":"Nan He, Jiabo Yin, Pan Liu, Xiang Fu, Qian Zhang, Lei Cheng, Simon Moulds, Aliaksandr Volchak","doi":"10.1029/2025GL117322","DOIUrl":"10.1029/2025GL117322","url":null,"abstract":"Rapid transitions between dry and wet phases increasingly threaten global water resources and ecosystem sustainability. However, how the terrestrial water storage (TWS)–a key determinant of water and energy budgets–modulates these dry-wet abrupt alternation (DWAA) events remains poorly understood. Here, we leverage a recently reconstructed long-term TWS data set to evaluate global dynamics of DWAA events, and explore their teleconnection relationships with El Niño-Southern Oscillation (ENSO). We find that the frequency of DWAA events has increased more than three-fold during the past 4 decades (1979–2022), driven by heightened variability of atmospheric moisture transport and circulation dynamics. ENSO plays an essential role in modulating these transitions, with the La Niña phase in particular enhancing both the coverage and intensity of these events. These findings suggest an amplified risk of hydroclimatic extremes under climate warming, highlighting the urgent need to improve monitoring and prediction of these rapid transitions.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 18","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL117322","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127378","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

Causes of Eurasian Winter-Cooling During the Late 20th and Early 21st Century 20世纪末和21世纪初欧亚大陆冬季降温的原因

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-23 DOI: 10.1029/2024GL114140

Abhishek Savita, Joakim Kjellsson, Mojib Latif, Hyacinth C. Nnamchi, Sebastian Wahl

引用次数: 0

A Fair Assessment of Sea Ice Age Reduces Bias and Gives New Insight to Arctic Sea Ice Dynamics 对海冰年龄的公平评估减少了偏见，并为北极海冰动力学提供了新的见解

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-23 DOI: 10.1029/2025GL117765

Richard Davy, Heather Regan, Anton Korosov, Jakob Dörr, Philipp Griewank, Einar Olason

引用次数: 0

Unveiling Northern Antarctica's Marine-Covered Continent-Ocean Boundary and Characteristics Using Density and Magnetization Vector Structures 利用密度和磁化矢量结构揭示南极北部海洋覆盖的大陆-海洋边界和特征

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-23 DOI: 10.1029/2025GL117507

N. Wang, G. Ma, L. Li, T. Wang, Q. Meng

{"title":"Unveiling Northern Antarctica's Marine-Covered Continent-Ocean Boundary and Characteristics Using Density and Magnetization Vector Structures","authors":"N. Wang, G. Ma, L. Li, T. Wang, Q. Meng","doi":"10.1029/2025GL117507","DOIUrl":"10.1029/2025GL117507","url":null,"abstract":"The Antarctic continental margin, a critical transition zone between thin continental and incipient oceanic crust, preserves vital records of lithospheric extension and rupture, crucial for reconstructing Antarctica's ancient configuration. Extensive ice cover and extreme environments restrict the obtainable geological and ground-based data. Although airborne and satellite gravity-magnetic data are essential tools for Antarctic studies, their integration with sparse outcrops remains hindered for interpretational ambiguity. Magmatic rifting alters crustal density and magnetization while preserving remanent magnetism, facilitating continent-ocean boundary (COB) identification. We develop a high-precision and fast inversion method to obtain density and magnetization structures following subduction and fragmentation. Magma intrusions in the Antarctic Peninsula and Dronning Maud Land exhibit 20° and −120° magnetization directions, respectively, at 10–30 km depths, reveal differential tectonic patterns along the margin. The refined COB highlights how subduction and extension shape continental margins, offering new insights into geodynamics and plate evolution under global climate change.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 18","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL117507","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145117194","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

The Sequestration Efficiency of the Deep Ocean 深海的封存效率

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-23 DOI: 10.1029/2025GL116799

Benoît Pasquier, Richard J. Matear, Matthew A. Chamberlain, Tilo Ziehn, David K. Hutchinson, François W. Primeau, Yi Liu, Ann Bardin

{"title":"The Sequestration Efficiency of the Deep Ocean","authors":"Benoît Pasquier, Richard J. Matear, Matthew A. Chamberlain, Tilo Ziehn, David K. Hutchinson, François W. Primeau, Yi Liu, Ann Bardin","doi":"10.1029/2025GL116799","DOIUrl":"10.1029/2025GL116799","url":null,"abstract":"The abyssal ocean may provide adequate sequestration for Carbon Capture and Storage and Carbon Dioxide Removal. The transit of carbon from seafloor release to ocean surface can take millennia, as it occurs through many water pathways characterized by long-tailed transit-time distributions (TTDs). However, multi-millennial simulations of TTDs are typically prohibitively expensive. Here, we introduce an idealized but computationally efficient methodological framework for computing TTDs offline from climate-model archives. We applied this framework to one Earth System Model to estimate the deep ocean sequestration efficiency for the 2030s and 2090s ocean circulations. We found that sequestration is most efficient on abyssal plains isolated from deep branches of the conveyor belt, such as the North Pacific Basins, where less than 10% of the water reaches the surface after 1,000 years. The climate-warming-induced slowdown of the 2090s deep-ocean circulation extends return times by about 30%, which exceeds internal climate variability (<math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 <mn>20</mn>\u0000 </mrow>\u0000 <annotation> ${sim} 20$</annotation>\u0000 </semantics></math>%).","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 18","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL116799","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145117198","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

A Global Speleothem-Based Assessment of Spontaneous Dansgaard–Oeschger Type Oscillations in Two Isotope-Enabled General Circulation Models 两种同位素驱动环流模式中基于洞穴的自发Dansgaard-Oeschger型振荡的全球评估

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-23 DOI: 10.1029/2025GL114906

John Slattery, Louise C. Sime, Kira Rehfeld, Nils Weitzel, Irene Malmierca-Vallet, Xu Zhang, Paul J. Valdes, Francesco Muschitiello

{"title":"A Global Speleothem-Based Assessment of Spontaneous Dansgaard–Oeschger Type Oscillations in Two Isotope-Enabled General Circulation Models","authors":"John Slattery, Louise C. Sime, Kira Rehfeld, Nils Weitzel, Irene Malmierca-Vallet, Xu Zhang, Paul J. Valdes, Francesco Muschitiello","doi":"10.1029/2025GL114906","DOIUrl":"10.1029/2025GL114906","url":null,"abstract":"Several general circulation models have now demonstrated the ability to simulate spontaneous millennial-scale oscillations that resemble Dansgaard–Oeschger (DO) events. It is often unclear how representative of DO events these simulations are, particularly outside of the polar regions. To test this, we directly compare simulated <math>\u0000 <semantics>\u0000 <mrow>\u0000 <msup>\u0000 <mi>δ</mi>\u0000 <mn>18</mn>\u0000 </msup>\u0000 <mi>O</mi>\u0000 </mrow>\u0000 <annotation> ${delta }^{18}O$</annotation>\u0000 </semantics></math> changes from two isotope-enabled models to a compilation of 111 speleothem records from 67 caves across the low- and mid-latitudes. We find that both models successfully reproduce the observed pattern of changes in Europe and the Mediterranean, Asia, and Central America. However, they perform less well for Western North America, South America, and Oceania, and the simulated changes are also generally too small in their magnitude. Where the models do reproduce the observed changes, we find evidence that the isotopic variability is influenced by both local and remote drivers, but the remote drivers appear more important.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 18","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL114906","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145117195","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

Drought-Induced Land Subsidence in the Mekong Delta, Vietnam: Insights From SAR Interferometry 越南湄公河三角洲干旱引起的地面沉降：来自SAR干涉测量的见解

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-23 DOI: 10.1029/2025GL117096

Nils Dörr, Long Vu Huu, Andreas Schenk, Stefan Hinz

引用次数: 0

Enhanced Bimodal Seasonal Distribution of Tropical Cyclone Genesis Potential Over the North Indian Ocean Toward Glacial Inception 北印度洋热带气旋形成势在冰期开始前的增强双峰季节分布

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-09-23 DOI: 10.1029/2025GL117248

Qing Yan, Nanxuan Jiang, Robert Korty, Dubin Huan

{"title":"Enhanced Bimodal Seasonal Distribution of Tropical Cyclone Genesis Potential Over the North Indian Ocean Toward Glacial Inception","authors":"Qing Yan, Nanxuan Jiang, Robert Korty, Dubin Huan","doi":"10.1029/2025GL117248","DOIUrl":"10.1029/2025GL117248","url":null,"abstract":"The annual cycle of contemporary tropical cyclones (TCs) in the north Indian Ocean (NIO) shows a unique bimodal structure, but whether the bimodal seasonal character remains robust across different climates is unknown. Here, we investigate changes in environmental factors important to storm formation in the past warm-cold transition during 130–115 ka, in which climatic characteristics were comparable to future projections, though with an opposite sign. Based on a non-accelerated transient global climate simulation at ∼1° resolution, we illustrate that the annual cycle of environmental conditions supporting TC genesis over the NIO bifurcates into two discrete periods during the warm-cold transition, manifested by a shift from a unimodal to bimodal seasonal distribution. The shift is largely linked to the increased favorability for TC genesis in pre-monsoon season (April–May–June) toward the last glacial inception (∼115 ka), which is in turn tied to the orbitally-induced weakening of Indian monsoon-like circulations.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 18","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL117248","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145117197","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