Journal of Geophysical Research-Oceans最新文献_第2页

Introduction to the Special Collection on the Arctic Ocean's Changing Beaufort Gyre 北冰洋变化中的波弗特环流特别收藏简介

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-17 DOI: 10.1029/2025JC023013

Mary-Louise Timmermans, Isabela Le Bras, Jeff O’Brien, Annika Margevich, Paul Macoun, Bill Williams, Sarah Zimmermann

{"title":"Introduction to the Special Collection on the Arctic Ocean's Changing Beaufort Gyre","authors":"Mary-Louise Timmermans, Isabela Le Bras, Jeff O’Brien, Annika Margevich, Paul Macoun, Bill Williams, Sarah Zimmermann","doi":"10.1029/2025JC023013","DOIUrl":"https://doi.org/10.1029/2025JC023013","url":null,"abstract":"The Beaufort Gyre circulation system is a central part of the Arctic climate undergoing significant change in all environmental parameters. This paper presents two decades of intensive observations in the Beaufort Gyre and then introduces the publications that comprise this special collection on the changing Beaufort Gyre. Observations spanning 2003–2024 are analyzed to characterize the Beaufort Gyre's evolving freshwater and heat content, which are related to wind forcing modulated by the presence of sea ice. Following a period of sustained freshwater and heat accumulation in the first half of the record, freshwater and heat content have been declining in recent years. Trends indicate that prevailing winds are changing such that they are becoming less effective at spinning up the gyre and accumulating freshwater. This forcing is dominating over a trend to a weakening sea-ice pack that is less effective at spinning down the gyre. Details on the changing Beaufort Gyre are examined in the publications in this special collection, including studies on its sea ice, upper-ocean properties, freshwater sources and content, the fundamental dynamical balances of the Beaufort Gyre, water-mass circulation, and biogeochemistry. These studies bring new understanding of the Beaufort Gyre that is essential for accurately characterizing the Arctic climate system and informing future projections.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JC023013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144647392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

New Insights on Dissolved Organic Matter Cycling in the Cape Verde Frontal Zone From Its Optically Active Fraction 从其旋光活性组分对佛得角锋面区溶解有机质循环的新认识

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-15 DOI: 10.1029/2024JC022068

R. Campanero Nieto, J. S. P. Ibanhez, B. Fernández-Castro, A. Martínez-Pérez, M. J. Pazó, V. Vieitez dos Santos, S. Valiente, M. Nieto-Cid, A. Delgado-Huertas, J. Arístegui, X. A. Álvarez-Salgado

{"title":"New Insights on Dissolved Organic Matter Cycling in the Cape Verde Frontal Zone From Its Optically Active Fraction","authors":"R. Campanero Nieto, J. S. P. Ibanhez, B. Fernández-Castro, A. Martínez-Pérez, M. J. Pazó, V. Vieitez dos Santos, S. Valiente, M. Nieto-Cid, A. Delgado-Huertas, J. Arístegui, X. A. Álvarez-Salgado","doi":"10.1029/2024JC022068","DOIUrl":"https://doi.org/10.1029/2024JC022068","url":null,"abstract":"Absorption and fluorescence spectroscopy have been used to gain new insights on the dynamics of Dissolved Organic Matter (DOM) in the Cape Verde Frontal Zone (CVFZ), a highly dynamic area comprising the thermohaline Cape Verde Front (CVF) and the Cape Blanc Giant Filament (CBGF), which exports organic matter produced over the shelf to the adjacent open ocean. A full-depth hydrographic box embracing the CVF and the CBGF was occupied in summer 2017 to examine the impact of these hydrographic structures and local-scale remineralization processes on DOM cycling using the distributions of the colored (CDOM) and fluorescent (FDOM) fractions of DOM as tracers. In the surface layer, we observed contrasting optical properties between the stratified, productive tropical waters south of the CVF with higher signals of optically active substances with higher molecular weight, and subtropical waters North of the CVF with lower signals and lower average molecular weight, pointing to lower microbial production and more intense or sustained photochemical degradation. In the ocean interior, although the mixing of intermediate and deep waters masses of contrasting origins and large-scale mineralization were the main factors controlling the distributions of the bulk and colored fractions of DOM, local-scale net accumulation of refractory humic-like and net consumption of labile protein-like components were observed in the mesopelagic layer. In bathypelagic waters, the optical properties of DOM allowed to characterize a bottom nepheloid layer (BNL) close to the Mauritanian coast, characterized by prominent CDOM and FDOM signals that were not noticeable in dissolved organic carbon (DOC) profiles.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC022068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Attribution of Interannual Variability of the Upper- and Lower-Layer Indonesian Throughflow Based on Adjoint Sensitivity 基于伴随敏感性的印尼高层和低层通流年际变率归因

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-15 DOI: 10.1029/2025JC022723

Yi Jin, Armin Köhl, Detlef Stammer

{"title":"Attribution of Interannual Variability of the Upper- and Lower-Layer Indonesian Throughflow Based on Adjoint Sensitivity","authors":"Yi Jin, Armin Köhl, Detlef Stammer","doi":"10.1029/2025JC022723","DOIUrl":"https://doi.org/10.1029/2025JC022723","url":null,"abstract":"The Indonesian Throughflow (ITF) and its variability significantly impact regional oceanography and global climate system. To attribute ITF interannual variability to local and remote forcing, a near-global ocean model and its adjoint are utilized to derive adjoint sensitivities of upper-layer (<300 m) and lower-layer (>300 m) ITF to surface momentum and buoyancy fluxes with spatiotemporal details. The historical ITF simulation aligns closely with reanalysis data and observational data in both layers. The adjoint sensitivity reveals that ITF interannual variability is primarily driven by wind stress occurring within the preceding 6 months, while buoyancy flux contributions are negligible. Combined with perturbation experiments, we demonstrate the physical interpretations of the derived adjoint sensitivities. The near-opposite adjoint sensitivities between upper- and lower-layer ITF suggest that wind stress impacts the ITF mainly through wind-driven currents, Kelvin wave and Rossby wave propagation along the equatorial Indo-Pacific region. Specifically, the lower-layer ITF is primarily influenced by wind stress over the equatorial Indian Ocean, which generates opposite variabilities in the upper layer. Therefore, the equatorial Pacific emerges as the dominant driver of full-depth ITF interannual variability, with a strong El Niño–Southern Oscillation (ENSO) signature. This study demonstrates that the robust relationship between ITF interannual variability and wind stress changes is independent of both ENSO and seasonal variations. As a novel application, this approach enables historical reconstruction of the interannual variability for both the full-depth ITF and its vertical structure using reliable wind data.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JC022723","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effect of Tropical Cyclones on the Strength of Cold Filament in the South China Sea 热带气旋对南海冷丝强度的影响

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-14 DOI: 10.1029/2025JC022677

Zezheng Zhao, Huipeng Wang, Taikang Yuan, Shengmu Yang, Kaijun Ren

{"title":"Effect of Tropical Cyclones on the Strength of Cold Filament in the South China Sea","authors":"Zezheng Zhao, Huipeng Wang, Taikang Yuan, Shengmu Yang, Kaijun Ren","doi":"10.1029/2025JC022677","DOIUrl":"https://doi.org/10.1029/2025JC022677","url":null,"abstract":"Cold filaments (CFs) in the southwestern South China Sea (SCS), extend eastwards from the Vietnamese coast during summer and autumn, significantly influence hydrodynamic and ecological distributions in the region. By integrating multi-source observations and reanalysis data from 2000 to 2023 (including sea surface temperature, sea level anomalies, surface currents, and wind fields), this study proposes an objective method for identifying CF areas and intensity using sea surface isotherms. Based on the changes of CFs, the impact of typhoons passing through the northern SCS on southwestern CFs is investigated. Statistical results revealed that 66 typhoons over the past 24 years have exerted enhanced effects on CFs. These findings demonstrate that typhoons traversing the northern SCS can enhance the CFs located over 10 latitudes south of the typhoon tracks. This indicates that typhoons not only directly affect oceanic dynamic processes along their paths but also exert significant remote influences on coastal dynamics in other regions. The mechanism analysis shows that typhoons primarily enhance the CFs through two pathways: (a) Intensifying southwest winds over Vietnam's eastern coast, thereby increasing the wind stress curl and triggering stronger-than-climatological upwelling that brings deep cold water to the surface; (b) altering the dipole distribution pattern in the southwestern SCS through enhanced southwesterly winds, which strengthen cold eddies and intensify offshore currents, transporting more coastal cold water to the open sea. These combined effects ultimately amplify the intensity of the CFs and expand their coverage.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JC022677","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144615531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Impacts of an Explosive Cyclone on the Upper Ocean and Sea Ice Over the Southern Ocean Based on Numerical Modeling Results 基于数值模拟结果的爆炸气旋对南大洋上层和海冰的影响

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-11 DOI: 10.1029/2024JC022064

Xiaoqi Xu, Jiping Liu, Chao-Yuan Yang, Gang Huang, Mirong Song

{"title":"The Impacts of an Explosive Cyclone on the Upper Ocean and Sea Ice Over the Southern Ocean Based on Numerical Modeling Results","authors":"Xiaoqi Xu, Jiping Liu, Chao-Yuan Yang, Gang Huang, Mirong Song","doi":"10.1029/2024JC022064","DOIUrl":"https://doi.org/10.1029/2024JC022064","url":null,"abstract":"Explosive cyclones are intense extratropical synoptic systems associated with severe weather in the mid-to-high latitudes, particularly over the Southern Ocean. This study employs a recently developed ROMS-CICE coupled model, incorporating a cyclone-removal method, to simulate and quantify the response of the upper ocean and sea ice to an explosive cyclone traversing the Southern Pacific Ocean. The modeling results indicate that the maximum instantaneous sea surface warming anomaly reaches up to 0.20°C around the center of the explosive cyclone, while a cooling anomaly of about −0.15°C is observed at the cyclone's periphery. Beneath this surface anomaly, a cooling of up to −0.15°C occurs in the area-averaged subsurface ocean layer at depths of 20–60 m. Concurrently, the sea surface salinity experiences an increasing anomaly of up to 0.20 practical salinity units (psu), accompanied by a decrease in salinity within the subsurface ocean layer at depths of 30–60 m. These anomalies gradually weaken over the subsequent 28–30 days but sustain minor anomalies for more than 1 month, particularly in the subsurface ocean layer. Further analysis of the temperature and salinity tendency equations reveals that advection and vertical diffusion primarily contribute to both the surface and subsurface responses, with vertical diffusion serving as the main driver behind the observed uniform patterns. Additionally, sea ice concentration and thickness demonstrate reductions of more than 25% and 0.2 m near the coast, respectively, resulting from dynamic forcing and the contributions of basal ice melting due to the transport of warmer water currents beneath.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144598206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effect of Subsurface High Spiciness Variability on the Weakened Upper Ocean Stratification in the Western Tropical Pacific Since 2000 2000年以来西热带太平洋表层高辣度变率对上层分层减弱的影响

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-11 DOI: 10.1029/2025JC022829

Huangyuan Shi, Shaojun Zheng, Ling Du, Xubin Ni

{"title":"Effect of Subsurface High Spiciness Variability on the Weakened Upper Ocean Stratification in the Western Tropical Pacific Since 2000","authors":"Huangyuan Shi, Shaojun Zheng, Ling Du, Xubin Ni","doi":"10.1029/2025JC022829","DOIUrl":"https://doi.org/10.1029/2025JC022829","url":null,"abstract":"Recent studies have reported that global upper ocean stratification has intensified under the influence of global warming. Nevertheless, using both observations and long-term reanalysis data, we find that concurrent with the significant ocean warming, the increasing trend of upper ocean stratification attenuated in the western tropical Pacific after 2000. This study highlights the effects of subsurface high spiciness (warm and salty) anomalies on the attenuation of the increasing stratification trend, which mirrors distinct vertical structures in the long-term changes in temperature and salinity. Subsurface warming, rather than sea surface warming, is the primary driver of the increase in the ocean heat content and the weakening of ocean stratification as it substantially reduces the magnitude of the trend in the vertical thermal density gradient after 2000. These phenomena are closely associated with processes on isopycnals and reflect ocean dynamics driven by large-scale atmospheric circulation. Intensified tropical trade winds and accelerated undercurrents facilitate the convergence of heat and salt in the western tropical Pacific. In addition, changes in the depth of the isopycnal layers induced by anomalous wind stress curl contribute to the subsurface spiciness variability through heaving. Notably, the consistent increase in the salinity from the surface to the subsurface also contributes to the post-2000 weakening trend of the vertical haline density gradient. Analysis within the isopycnal framework demonstrates that the emergence of subsurface salty water effectively offsets the negative contribution of the thermal component to the weakening of density stratification in relatively deeper layers.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144598290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Conductive Heat Flux Over Arctic Sea Ice From 1979 to 2022 1979 - 2022年北极海冰上的传导热通量

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-10 DOI: 10.1029/2024JC022062

Yinghui Liu, Jinlun Zhang

{"title":"Conductive Heat Flux Over Arctic Sea Ice From 1979 to 2022","authors":"Yinghui Liu, Jinlun Zhang","doi":"10.1029/2024JC022062","DOIUrl":"https://doi.org/10.1029/2024JC022062","url":null,"abstract":"The conductive heat flux (CHF) from the ocean to the snow/sea ice-atmosphere interface through sea ice is a crucial component of the surface energy budget over the sea ice-covered Arctic Ocean. The CHF is influenced by surface skin temperature, sea ice thickness, and depth of snow on sea ice. This study uses monthly mean surface skin temperature from ERA5 reanalysis, and sea ice thickness and snow depth from the Pan-Arctic Ice-Ocean Modeling and Assimilation System to derive the means and changes of CHF over the Arctic Ocean from 1979 to 2022. The findings reveal that CHFs are generally positive (from flux to the surface from below) from November to March and negative from June to August. CHFs are large in peripheral seas with thin sea ice and low snow depth, and small over pack ice with thick sea ice and snow. The thinning of sea ice and snow on sea ice contributes to increasing CHF, while rising surface skin temperatures lead to decreasing CHF. Overall, CHF increases from 1979 to 2022, primarily driven by the thinning of sea ice. The magnitude of CHF changes during this period is comparable to or higher than those in sensible heat flux, latent heat flux, and net longwave/thermal radiation flux at the surface from November to March over the peripheral seas. A better representation of sea ice thickness and snow depth over sea ice in the reanalysis would possibly improve the depiction of CHF and surface temperature changes.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC022062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Changes in Sedimentary Organic Carbon Compositions in the Mackenzie Trough Over Recent Centuries: Insights Into Permafrost Thawing in the Canadian Arctic 近几个世纪以来麦肯齐海槽沉积有机碳组成的变化：对加拿大北极永久冻土融化的洞察

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-08 DOI: 10.1029/2025JC022652

Dahae Kim, Jung-Hyun Kim, Young Jin Joe, Youngkyu Ahn, Tommaso Tesi, Gerrit Lohmann, Sujeong Jeong, Seung-Il Nam

{"title":"Changes in Sedimentary Organic Carbon Compositions in the Mackenzie Trough Over Recent Centuries: Insights Into Permafrost Thawing in the Canadian Arctic","authors":"Dahae Kim, Jung-Hyun Kim, Young Jin Joe, Youngkyu Ahn, Tommaso Tesi, Gerrit Lohmann, Sujeong Jeong, Seung-Il Nam","doi":"10.1029/2025JC022652","DOIUrl":"https://doi.org/10.1029/2025JC022652","url":null,"abstract":"This study analyzed three sediment cores (ARA08C/02-2BC, ARA08C/03-2BC, and ARA04C-40MUC) from the Mackenzie Trough in the Beaufort Sea, collected in 2013 and 2017. Using bulk sediment properties (carbon and nitrogen contents, stable carbon isotopes, and radiocarbon isotopes) and terrestrial biomarkers (lignin phenols), we examined the impacts of permafrost thaw on sedimentary organic carbon (OC) in the Canadian Beaufort Sea. Our objective was to investigate whether changes in OC sources reflect the environmental changes documented in the region over the past few decades. At the core site of ARA08C/03-2BC, we observed an increase in soil-derived OC accumulation rates (ARs) since the early 20th century, with a noticeable rise over the past few decades, while petrogenic OC ARs showed a slight decline. Grain size end-member (EM) modeling identified three primary EM groups, revealing a general increase in the proportion of coarse grains (sum of EM2 + EM3 end-members) since the early 1900s, with a marked acceleration in recent decades. These trends align with regional surface temperature increases over the past few decades, suggesting that permafrost thaw has increasingly affected sedimentary OC dynamics in the Canadian Beaufort Sea. Given climate models that predict accelerated warming in the Mackenzie Basin, our findings highlight the critical need for precise quantification of OC fluxes to improve projections of regional carbon budgets and climate dynamics in the Arctic.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144574146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Seasonal Variability of Internal Tides and Associated Energy Budget Over the Eastern Arabian Sea: Observations and Modeling 阿拉伯海东部内部潮汐和相关能量收支的季节变化：观测和模拟

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-08 DOI: 10.1029/2024JC021529

Pragnya Makar, A. D. Rao, B. Yadidya, Vimlesh Pant

{"title":"Seasonal Variability of Internal Tides and Associated Energy Budget Over the Eastern Arabian Sea: Observations and Modeling","authors":"Pragnya Makar, A. D. Rao, B. Yadidya, Vimlesh Pant","doi":"10.1029/2024JC021529","DOIUrl":"https://doi.org/10.1029/2024JC021529","url":null,"abstract":"The seasonal variability of Internal tides (ITs) in the Eastern Arabian Sea was studied in detail using in-situ observations and numerical modeling. Moored buoy observations identified M2 and K1 as the predominant tidal constituents, succeeded by S2 and O1. The 3D- Massachusetts Institute of Technology General Circulation Model is used to study the seasonal changes in the generation, propagation, and dissipation of ITs. We found that ITs are primarily generated along the continental shelf-slope break, with prominent generation sites off Mumbai in the north, around the Lakshadweep region, and near the Maldives in the south. Stratification varies both seasonally and regionally, strengthening from north to south. The enhancement of IT available potential energy and horizontal kinetic energy is observed during the pre-monsoon season in the north and during the monsoon season in the south, attributed to increased stratification. Shelf-slope areas off Mumbai and near the Maldives contribute approximately 66% of the total barotropic-to-baroclinic energy conversion. Energy flux patterns indicate a southwestward propagation from the Mumbai region and a westward propagation from the Maldives. Semidiurnal energy conversion and associated fluxes generally exceed those of diurnal energy across most seasons. These findings underscore that seasonal variability is primarily driven by changes in stratification, offering essential insights into the dynamics of ITs in this region.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144574145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Unveiling the Hidden Eddy Field of the Southern Ocean 揭开南大洋隐藏的涡流场

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-07-08 DOI: 10.1029/2025JC022785

C. Hancock

引用次数: 0