Geophysical Research Letters最新文献_第3页

Modeling Anisotropic Signature of Slab-Induced Mantle Plumes From Thermochemical Piles in the Lowermost Mantle 最下层地幔热化学桩中板块诱导地幔柱的各向异性特征建模

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-26 DOI: 10.1029/2024GL113299

Poulami Roy, Bernhard Steinberger, Manuele Faccenda, Michaël Pons

{"title":"Modeling Anisotropic Signature of Slab-Induced Mantle Plumes From Thermochemical Piles in the Lowermost Mantle","authors":"Poulami Roy, Bernhard Steinberger, Manuele Faccenda, Michaël Pons","doi":"10.1029/2024GL113299","DOIUrl":"https://doi.org/10.1029/2024GL113299","url":null,"abstract":"Seismic anisotropy, observed in the lowermost mantle near Large Low-Shear-Velocity Provinces (LLSVPs), is likely caused by strong deformation from mantle flow interacting with these regions and/or plume formation. This study explores slab-induced plume generation from LLSVPs under the assumption that LLSVPs are thermochemical piles and resulting flow behavior using 3-D regional-scale mantle convection models in ASPECT, coupled with mantle fabric simulations in ECOMAN. We tested various models with different LLSVP density and viscosity. The modeling of the crystallographic-preferred orientation with predominant activity of the slip system [001](100) for Bridgmanite and [100](001) for post-Perovskite reveals that substantial seismic anisotropy develops in the lowermost mantle, and specifically (a) at the margins of the rheologically stiffer LLSVP piles where deformation and upwelling of the surrounding mantle take place and fast horizontally polarized shear waves (Vsh) transition to fast Vsv and (b) within plume roots and conduits where vertically polarized shear waves (Vsv) are faster.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 10","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL113299","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135685","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

Large Decreases in Sea Ice Strength and Pressure Along Major Arctic Shipping Routes Projected for the Next Two Decades 预计未来20年北极主要航道海冰强度和压力将大幅减少

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-26 DOI: 10.1029/2025GL114831

Oleg A. Saenko, Neil F. Tandon, Stephen E. L. Howell

引用次数: 0

Response of an Arctic Mixed-Phase Cloud to Ice-Nucleating Particle Perturbations and Warming 北极混合相云对冰核粒子扰动和变暖的响应

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-26 DOI: 10.1029/2024GL114467

Britta Schäfer, Robert Oscar David, Øivind Hodnebrog, Trude Storelvmo

引用次数: 0

Evidence for Petit-Spot Volcanism in the Puerto Rico Trench 波多黎各海沟小点火山活动的证据

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-26 DOI: 10.1029/2024GL114362

Nicholas Harmon, William Danforth, Uri Ten Brink, J. Pablo Canales, Shuoshuo Han, Elizabeth Vanacore, Jose-Luis Granja-Bruña, Wayne Baldwin, Seth Ackerman, Liam Moser, Elisaveta Sokolkova

引用次数: 0

Iron Isotope Evidence for Heightened Primary Productivity Triggered by Hydrothermally Sourced Nutrients During Oceanic Anoxic Event 2 海洋缺氧事件中热液源营养物引发初级生产力提高的铁同位素证据2

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-25 DOI: 10.1029/2024GL114116

Binchen Li, Yong-Xiang Li, Yuqi Li, Weiqiang Li

{"title":"Iron Isotope Evidence for Heightened Primary Productivity Triggered by Hydrothermally Sourced Nutrients During Oceanic Anoxic Event 2","authors":"Binchen Li, Yong-Xiang Li, Yuqi Li, Weiqiang Li","doi":"10.1029/2024GL114116","DOIUrl":"https://doi.org/10.1029/2024GL114116","url":null,"abstract":"Oceanic Anoxic Event 2 (OAE2, ∼94 Ma) represents a major global cycle perturbation in the mid-Cretaceous greenhouse that is commonly attributed to increased biological primary productivity stimulated by elevated nutrients. However, whether increased nutrients were sourced from submarine volcanism or enhanced continental weathering remains elusive. Here we present a high-resolution whole-rock Fe isotope record of the expanded OAE2 interval at Gongzha section in southern Tibet to trace iron cycling through the biological, geological and geochemical processes across OAE2. δ56FeT data show three notable negative shifts, corresponding to episodes of intensified volcanism as documented by the osmium isotope record, with the largest shift followed by a prolonged positive δ56FeT excursion coeval with the positive δ13C shift of OAE2, compatible with a causal link between hydrothermally sourced iron and biological uptake. Similar δ56FeT patterns are observed in other OAE2 sections of different settings, implying submarine volcanism as the driving force for initiating OAE2.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 10","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL114116","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135765","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

Impact of Penetrating Kelvin Waves on MJO Rainfall Propagation Through Deep Convection Modulation 穿透开尔文波对深对流调制MJO降雨传播的影响

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-25 DOI: 10.1029/2025GL116549

Xingchao Chen, L. Ruby Leung, Zhe Feng

引用次数: 0

Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts 快速冷却海底玄武岩内应力增强的海洋磁异常

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-24 DOI: 10.1029/2025GL115045

Fei Han, Huapei Wang, Yiliang Lv, Greig A. Paterson, Andrew J. Biggin, Wyn Williams, Tao Yang, Junxiang Miao, Ting Cao, Duowen Zhu, Chen Wen, Shaochen Hu, Xiaowei Chen, Mengqing Wang, Yiming Ma, Jiakun Fang, Jiabo Liu

{"title":"Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts","authors":"Fei Han, Huapei Wang, Yiliang Lv, Greig A. Paterson, Andrew J. Biggin, Wyn Williams, Tao Yang, Junxiang Miao, Ting Cao, Duowen Zhu, Chen Wen, Shaochen Hu, Xiaowei Chen, Mengqing Wang, Yiming Ma, Jiakun Fang, Jiabo Liu","doi":"10.1029/2025GL115045","DOIUrl":"10.1029/2025GL115045","url":null,"abstract":"Marine magnetic anomalies are pivotal to our understanding of plate tectonics, geomagnetic fields, and deep Earth dynamics. However, the question of how Ti-rich titanomagnetites, the primary remanence carriers in oceanic crust rocks, can faithfully preserve geomagnetic field information for tens of millions of years is not well understood. Here, we combine microscopic, micromagnetic, and rock magnetic analyses, including 14-T high-field measurements, to show that the magnetic micro-anisotropy of a fresh pillow lava dredged from the Juan de Fuca Ridge is dominated by internal stress throughout its chilled margin to its interior. Internal stress, which is generated primarily by the contraction of hot lava erupting into cold seawater, increased the natural remanent magnetization in this lava by a factor of ∼3. We suggest that stress-induced magnetic domain state transformation from multidomain to single vortex (or single domain) in extrusive pillow lavas significantly enhances oceanic crustal magnetic remanence strength and stability.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 10","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL115045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130663","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

Contrasting Mechanisms Controlling Pb Isotopes of Dust in Inland and Marine Archives 内陆和海洋档案中粉尘铅同位素控制机制对比

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-24 DOI: 10.1029/2024GL114133

Ruxi Dou, Jianjun Zou, Xuefa Shi, Zhi Dong, Yonghua Wu, Aimei Zhu, Xuguang Feng, Xinqing Zou, Sergey Gorbarenko, Yuriy Vasilenko, Aleksandr Bosin

{"title":"Contrasting Mechanisms Controlling Pb Isotopes of Dust in Inland and Marine Archives","authors":"Ruxi Dou, Jianjun Zou, Xuefa Shi, Zhi Dong, Yonghua Wu, Aimei Zhu, Xuguang Feng, Xinqing Zou, Sergey Gorbarenko, Yuriy Vasilenko, Aleksandr Bosin","doi":"10.1029/2024GL114133","DOIUrl":"10.1029/2024GL114133","url":null,"abstract":"Lead (Pb) isotopes are powerful tools for tracing dust provenance and reconstructing paleoclimate. However, variations in Pb isotopic compositions among different grain-size fractions in sediments complicate their use. We examine the Nd-Pb isotopic compositions of two sediment fractions (<2 μm and 30–63 μm) from the central Japan Sea during the last glaciation (26–12 ka BP). Our results indicate that these sediments primarily consist of aeolian dust transported by the East Asian Winter Monsoon. The <2 μm fraction exhibits more radiogenic Pb isotopes than the 30–63 μm fraction. This size-dependent discrepancy in Pb isotopes is attributed to differences in sediment composition, governed by the incongruent weathering of minerals in source rocks and transport sorting. Comparisons of dust records from inland and marine archives reveal contrasting mechanisms that control Pb isotopic compositions. We propose that greater caution is necessary when using Pb isotopes in paleoclimatology and paleoceanography.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 10","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL114133","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130666","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

Mechanisms Linking Stratospheric Gravity Wave Activity to Hurricane Intensification: Insights From Model Simulation of Hurricane Joaquin 将平流层重力波活动与飓风增强联系起来的机制：来自飓风华金模式模拟的见解

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-24 DOI: 10.1029/2024GL113531

X. Wu, L. Hoffmann, C. J. Wright, N. P. Hindley, M. J. Alexander, X. Wang, B. Chen, Y. Wang, M. Li

{"title":"Mechanisms Linking Stratospheric Gravity Wave Activity to Hurricane Intensification: Insights From Model Simulation of Hurricane Joaquin","authors":"X. Wu, L. Hoffmann, C. J. Wright, N. P. Hindley, M. J. Alexander, X. Wang, B. Chen, Y. Wang, M. Li","doi":"10.1029/2024GL113531","DOIUrl":"10.1029/2024GL113531","url":null,"abstract":"Previous studies based on satellite observations and model simulations have revealed a significant correlation between intense stratospheric gravity wave (GW) activity and hurricane intensification. This research further investigated the underlying mechanism of this correlation by analyzing the properties and propagation characteristics of stratospheric GWs excited by Hurricane Joaquin based on a Weather Research and Forecasting model simulation. By employing the 3-D Stockwell wave analysis method, we found that GWs excited during hurricane intensification display relatively higher intrinsic frequencies, shorter horizontal wavelengths, and longer vertical wavelengths than during weakening. Analysis of these GWs' propagation using the GROGRAT ray-tracing model revealed that they can reach the middle stratosphere rapidly within 20 min. This quick propagation enabled the observation of intense stratospheric GWs before the hurricane reached its peak intensity, offering a potential indicator for hurricane intensification. These findings strengthened the basis for considering stratospheric GW activity as a proxy for hurricane intensification under specific conditions.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 10","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL113531","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130665","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

Samudra: An AI Global Ocean Emulator for Climate Samudra：一个AI全球海洋气候模拟器

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-05-24 DOI: 10.1029/2024GL114318

Surya Dheeshjith, Adam Subel, Alistair Adcroft, Julius Busecke, Carlos Fernandez-Granda, Shubham Gupta, Laure Zanna

引用次数: 0