Journal of Geophysical Research-Oceans最新文献_第3页

Diurnal Oceanic Thermal Variability in the Atlantic Cold Tongue: Dependence on Wind Speed and Background Conditions 大西洋冷舌的日海洋热变率：对风速和背景条件的依赖

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-20 DOI: 10.1029/2025JC022488

F. Gasparin, S. Cravatte, J. Jouanno, A. C. Hans, E. Kestenare, M. Gévaudan, J. Llido, P. Brandt

{"title":"Diurnal Oceanic Thermal Variability in the Atlantic Cold Tongue: Dependence on Wind Speed and Background Conditions","authors":"F. Gasparin, S. Cravatte, J. Jouanno, A. C. Hans, E. Kestenare, M. Gévaudan, J. Llido, P. Brandt","doi":"10.1029/2025JC022488","DOIUrl":"10.1029/2025JC022488","url":null,"abstract":"Diurnal ocean mixing processes in the equatorial Atlantic play a crucial role in shaping surface temperature and velocity, thereby influencing air-sea interactions and the vertical heat transport. However, characterizing the upper ocean diurnal variability remains challenging due to its high vertical and temporal variability and limited observations, resulting in uncertainties in ocean model skills. Between March and July of 2021 and 2022, 10 specially programmed Argo floats were deployed to sample the diurnal cycle in the equatorial Atlantic at high temporal (3-hourly) and vertical (meter-scale) resolution. Combined with mooring data, the observations revealed that weaker winds in March–April were associated with a shallower and slower (1.8 m/hr) vertical extension of the diurnal warm layer, compared to May–June corresponding to the seasonal onset of the cold tongue, when the deepening rate reached 3.2 m/hr. The comparison of the observations with a regional model demonstrates that the model reproduces most features of the observed diurnal warm layer but underestimates its vertical extension and deepening rate. The model is then used to show that the diurnal vertical heat flux through the mixed layer increases by 50% from weak to strong wind conditions. However, oceanic background conditions also play a significant role, as similar mean wind speeds can result in vertical heat fluxes that reach twice the depth and intensity at 10°W compared to 0°. This study emphasizes the need to better capture diurnal variability to assess its impact on the Atlantic cold tongue and its representation in models.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JC022488","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102129","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

Impact of the Irrawaddy Diluted Water on Upper-Layer Salinity in the Bay of Bengal 伊洛瓦底江稀释水对孟加拉湾上层盐度的影响

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-20 DOI: 10.1029/2025JC022939

Ting Huang, Feng Zhou, Liang Xue, Ruijie Ye, Qicheng Meng

{"title":"Impact of the Irrawaddy Diluted Water on Upper-Layer Salinity in the Bay of Bengal","authors":"Ting Huang, Feng Zhou, Liang Xue, Ruijie Ye, Qicheng Meng","doi":"10.1029/2025JC022939","DOIUrl":"10.1029/2025JC022939","url":null,"abstract":"The Bay of Bengal (BoB) is characterized by notably low salinity levels primarily driven by riverine inputs. However, the pathways of Irrawaddy Diluted Water (IDW), an important source of freshwater, are still not well understood. This study integrates satellite-derived salinity data with reanalysis products and Lagrangian particle tracking simulations to investigate the transport dynamics of IDW. An analysis of the mixed layer salt budget reveals that the horizontal advection of IDW leads to salinity anomalies along the western coast of Myanmar and central BoB. The results indicate a consistent northwestward movement of IDW from the northern Andaman Sea toward the western coastline of Myanmar during the period from September to November. Concurrently, Ganges-Brahmaputra Diluted Water (GBDW) is observed to propagate southwestward along the eastern coastline of India. Consequently, IDW, rather than GBDW, serves as the primary freshwater source contributing to the low salinity signature along Myanmar's western coast. In addition to its northwestward trajectory, IDW also demonstrates westward expansion into the central BoB during November and December. The northwestward transport of IDW is primarily influenced by the discharge from the Irrawaddy River, whereas its westward expansion is jointly regulated by river discharge and the westward flow through the Preparis Channel during November and December. This study presents the first comprehensive observational and modeling evidence of the dual expansion pathways of IDW in the BoB underscoring the influence of monsoon-driven circulation.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102127","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

Drivers of Spatiotemporal Distributions of Macro- and Micronutrients (Fe, Ni, Cu, Zn) in the Northern Gulf of Alaska 阿拉斯加湾北部地区铁、镍、铜、锌等常量和微量元素时空分布的驱动因素

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-19 DOI: 10.1029/2025JC022558

E. L. S. Ortega, Ava Meier, Seth L. Danielson, Kay McMonigal, A. M. Aguilar-Islas

{"title":"Drivers of Spatiotemporal Distributions of Macro- and Micronutrients (Fe, Ni, Cu, Zn) in the Northern Gulf of Alaska","authors":"E. L. S. Ortega, Ava Meier, Seth L. Danielson, Kay McMonigal, A. M. Aguilar-Islas","doi":"10.1029/2025JC022558","DOIUrl":"10.1029/2025JC022558","url":null,"abstract":"The productive Northern Gulf of Alaska (NGA) ecosystem is impacted by spatiotemporal variability in nutrient distributions and ratios. Due to its advective nature and wide (50–150 km) continental shelf, the NGA may act as a nutrient source to the greater NE Pacific. Using high-resolution data from 11 seasonal (spring, summer, fall) research cruises (2018–2023), we examined regional drivers of nutrient fields. We found that variable sources of micro- and macronutrients influence their distributions and ratios. For example, relative to cellular nutrient quotas for coastal diatoms, surface dissolved Fe (dFe): nitrate (NO3−) ratios indicated an Fe-replete regime near river outflows throughout the year. In contrast, far from freshwater and subsurface Fe inputs, this ratio indicated potential Fe stress or limitation within outer waters during spring. Near the seafloor, a pool of high dissolved micro- and macronutrients highlighted variable nutrient sources (sedimentary and deep offshore waters), and its location indicated its susceptibility to wind forcing. We also observed detachment of bottom boundary layers along shoaling isopycnals within the shelf-break front that can carry subsurface dFe to depths of ∼100 m: a depth that can be accessed by winter mixing. This represents a potential mechanism to deliver dFe from the shelf to offshore high nutrient low chlorophyll (HNLC) surface waters of the NGA, although shelf-basin exchange can be diminished by along-shelf flow (e.g., the Alaskan Stream). This work enhances understanding of nutrient sources in the NGA and adds to a relatively small global repository of seasonally high-resolution micronutrient data over continental shelves.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JC022558","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101847","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

Environmental Factors Associated With Fall Phytoplankton Blooms in the Northern Bering and Chukchi Seas 与白令海北部和楚科奇海浮游植物秋季繁殖有关的环境因素

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-19 DOI: 10.1029/2025JC022498

C. B. Gaffey, K. E. Frey, J. Rogan, L. Estes, L. W. Cooper, J. Clement Kinney, J. M. Grebmeier

{"title":"Environmental Factors Associated With Fall Phytoplankton Blooms in the Northern Bering and Chukchi Seas","authors":"C. B. Gaffey, K. E. Frey, J. Rogan, L. Estes, L. W. Cooper, J. Clement Kinney, J. M. Grebmeier","doi":"10.1029/2025JC022498","DOIUrl":"10.1029/2025JC022498","url":null,"abstract":"This study investigates environmental drivers of fall phytoplankton blooms in the Arctic, focusing on the northern Bering and Chukchi seas. Random Forests models were used to analyze covariates of fall phytoplankton blooms from 2013 to 2018, incorporating shipboard, remote sensing, and modeled environmental properties. Four regional models and one comprehensive all-station model considered fall as well as midsummer conditions. Midsummer properties included suspended particulate matter, chlorophyll-a, and the proportion of degraded pheophytin to chlorophyll-a used as a proxy for bloom stage. Open water duration was one of the highest ranked factors in predicting fall blooms. Open water duration also influences the stage of midsummer (July) blooms as indicated by pheophytin proportions, which in turn were the highest-ranked factor for predicting fall bloom events in the Chirikov Basin (northern Bering Sea between St. Lawrence Island and the Bering Strait) and the Chukchi Sea. Wind direction, specifically easterly winds, was an important predictor in the northern Bering Sea. Maximum wind speed ranked highly at stations located within the nutrient-poor Alaska Coastal Current in the Chukchi Sea. However, stormy days, average and maximum wind speeds generally ranked low in importance as a predictor of fall bloom events. Other parameters, including photosynthetic active radiation, modeled nutrient concentrations, mixed layer depth, and time since sea ice breakup date showed strong but regionally varying relationships with fall blooms. Altogether, results from these Random Forests models suggest that high wind events and storms in the absence of sea ice provide an incomplete narrative for initiating fall bloom events.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JC022498","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101844","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

Interannual Variability of Lower Circumpolar Deep Water Transport in the North Pacific Influenced by Surface Wind Forcing 受地面风强迫影响的北太平洋下环极深水输送的年际变化

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-19 DOI: 10.1029/2025JC022923

Chengcheng Yang, Xuhua Cheng, Jianhuang Qin

{"title":"Interannual Variability of Lower Circumpolar Deep Water Transport in the North Pacific Influenced by Surface Wind Forcing","authors":"Chengcheng Yang, Xuhua Cheng, Jianhuang Qin","doi":"10.1029/2025JC022923","DOIUrl":"10.1029/2025JC022923","url":null,"abstract":"The deep-ocean circulation in the North Pacific plays a crucial role in redistributing ocean heat and carbon storage, but understanding its low-frequency variability is hindered by the complexity of its pathways, particularly regarding the relationships between different branches and the underlying dynamics. This study investigates the interannual variability of lower circumpolar deep water (LCDW) transport on a basin-wide scale using the Estimating the Circulation and Climate of the Ocean Version 4 Release 4 (ECCO v4r4) data set. Our findings indicate that interannual variations in LCDW transport in the North Pacific are primarily governed by barotropic processes. The first empirical orthogonal function (EOF) mode of interannual variability is characterized by a cyclonic circulation in the northwestern Pacific, while the second mode exhibits a basin-wide cyclonic structure. Utilizing barotropic vorticity equation and regression analysis, it is further demonstrated that EOF1 and EOF2 modes are associated with the spatial pattern of a wind stress curl, which are linked to the El Niño-Southern Oscillation (ENSO) and the Victoria mode, respectively. Thus, despite the lack of direct atmospheric coupling with the deep ocean, the wind-driven ocean bottom pressure anomalies modulate the interannual variability of LCDW transport.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101848","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

Exploring Submesoscale Processes and Internal Solitary Waves Using SWOT Data in the South China Sea 南海亚中尺度过程与内孤立波的SWOT分析

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-19 DOI: 10.1029/2025JC022700

Enzhao Zhang, Mingfang Miao, Zhiwei Zhang

{"title":"Exploring Submesoscale Processes and Internal Solitary Waves Using SWOT Data in the South China Sea","authors":"Enzhao Zhang, Mingfang Miao, Zhiwei Zhang","doi":"10.1029/2025JC022700","DOIUrl":"10.1029/2025JC022700","url":null,"abstract":"The South China Sea (SCS) is abundant with oceanic fine-scale processes (FPs) that have horizontal scales smaller than 50 km, but their spatial and seasonal characteristics remain insufficiently understood due to the scarcity of high-resolution observations covering large spatial ranges. In this study, FPs in the SCS are systematically explored based on the Surface Water and Ocean Topography (SWOT) satellite mission which provides sea surface height data with kilometer-scale resolution in wide swaths. By defining FP signals as those missed by nadir-looking altimeters but resolved by SWOT, we find that northeastern and western parts of the SCS are two hotspots of FPs. The FPs show larger root-mean-squared sea level anomalies (SLAs) in summer than winter in both regions. By combining independent ocean color remote sensing data, we identify submesoscale processes and internal solitary waves (ISWs) as two typical forms of FPs captured by SWOT. Some submesoscale processes with spatial scales of ∼20 km and SLA amplitudes of 2.0–8.0 cm are demonstrated to be submesoscale anticyclonic (cyclonic) eddies, which have positive (negative) SLAs and are accompanied by lower (higher) chlorophyll-a concentrations. With respect to the ISWs, they mainly occur in the northeastern SCS originating from the Luzon Strait, and propagate westward and southwestward. ISWs occur more frequently in summer than winter. Their SLA amplitudes range from 5 to 51 cm and generally decrease with the shallowing water depths. These results demonstrate that SWOT data have a good application prospect for studying the characteristics and dynamics of FPs in the SCS.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101846","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

Global Observations of the Response of the Upper Ocean to Tropical Cyclones Based on Argo Profiles 基于Argo剖面的全球上层海洋对热带气旋响应的观测

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-16 DOI: 10.1029/2025JC022522

Chao Han, Melissa Bowen, Philip Sutton

{"title":"Global Observations of the Response of the Upper Ocean to Tropical Cyclones Based on Argo Profiles","authors":"Chao Han, Melissa Bowen, Philip Sutton","doi":"10.1029/2025JC022522","DOIUrl":"10.1029/2025JC022522","url":null,"abstract":"The upper ocean's temperature and salinity responses to Tropical Cyclones (TC) between 10˚—30° latitude on both sides of the Equator are observed with Argo float profile pairs between 2001 and 2024. The ocean response is found using across-track composites, generated by normalizing the distance between the profile and cyclone track by the 34-knot wind radius (R34) of each TC. Cooling of up to 1.2°C in the initial mixed layer (ML) extends from the TC center to about 3 R34 and is stronger on the side of the TC track with stronger winds. Subsurface warming between 40 and 80 m depth is observed between 0.5 and 3 R34 on the side of the track with stronger winds. Strong cooling is observed in a distinct core directly under the TC path (between ±0.5 R34), reaching from the surface to 1,000 m depth with upward isopycnal displacements of up to 18 m. Surface cooling and subsurface warming at the base of the ML are positively correlated with TC wind stress on the ocean, quantified by the Local Wind Power Dissipation index (PDiL), and negatively correlated with the energy required to destratify the upper ocean, defined by the Cooling Inhibition index (CI). Subsurface warming is common with low CI but is not observed with high CI. The typical cross-track thermal response between 30 and 150 m depth is heat loss, but the subsurface ocean can gain heat in low CI cases.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JC022522","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101091","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

Wave Attenuation by Restored Coral Reef Canopies: Implications for Coastal Protection 珊瑚礁冠层恢复后的波浪衰减：对海岸保护的启示

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-16 DOI: 10.1029/2025JC022854

Justin Geldard, Ryan J. Lowe, Marco Ghisalberti, Scott Draper

{"title":"Wave Attenuation by Restored Coral Reef Canopies: Implications for Coastal Protection","authors":"Justin Geldard, Ryan J. Lowe, Marco Ghisalberti, Scott Draper","doi":"10.1029/2025JC022854","DOIUrl":"10.1029/2025JC022854","url":null,"abstract":"The significant bottom roughness of coral reefs plays a vital role in mitigating wave-driven hazards along many tropical coastlines. As reef-building corals decline globally, reef restoration has been increasingly used to re-establish reef structure that influences wave dissipation. This study investigated the hydrodynamic processes that govern wave attenuation by restored reef canopies created using a common approach involving modular structures populated with coral colonies, based on the Mars Assisted Reef Restoration System. Three different coral covers were tested in a wave flume under various wave conditions and water depths typical of coral reef flats. We found that wave attenuation increased significantly with coral cover, driven by how specific attributes of the coral geometry controlled in-canopy flows and hydrodynamic forces. Two independent measures of wave energy dissipation generated by the reef were compared: (a) the rate of work done by hydrodynamic forces (calculated from force-velocity timeseries measurements), and (b) the observed wave height attenuation across the reef. These measures agreed well over the different coral covers and wave conditions studied, demonstrating that accurate quantification of in-canopy drag forces and flows enables reliable prediction of wave dissipation. The validated predictive framework was then used to evaluate the effectiveness of coral reef restoration under varying wave conditions and coral covers, showing that well-designed reef canopies can dissipate more than 50% of the incoming wave energy under typical reef flat conditions. These findings offer new insights into the hydrodynamic processes that govern wave attenuation by restored coral reef canopies, highlighting the potential of restoration to mitigate coastal hazard risk.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JC022854","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101119","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

Global Water Cycle Pattern Amplification: Contributing Factors and Mechanisms 全球水循环格局放大：影响因素和机制

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-16 DOI: 10.1029/2024JC022278

Yuxuan Lyu, Nathaniel L. Bindoff, Sandeep Mohapatra, Saurabh Rathore, Helen E. Phillips

{"title":"Global Water Cycle Pattern Amplification: Contributing Factors and Mechanisms","authors":"Yuxuan Lyu, Nathaniel L. Bindoff, Sandeep Mohapatra, Saurabh Rathore, Helen E. Phillips","doi":"10.1029/2024JC022278","DOIUrl":"10.1029/2024JC022278","url":null,"abstract":"Under climate change, both the global water cycle (evaporation minus precipitation) and mixed layer salinity exhibit a pattern amplification characterized by the “rich get richer and poor get poorer.” However, the contributions of horizontal and vertical oceanic processes to these patterns remain poorly understood. Using various ocean data products (1979–2018), this study quantifies the roles of horizontal and vertical advection, diffusion, and vertical entrainment in shaping mixed layer salinity distributions through salinity budget analysis. Our findings suggest that horizontal advection mitigates local salinity buildup in evaporation-dominated subtropical regions, whereas vertical processes transfer excess freshwater into the deeper ocean in precipitation-dominated areas. These mechanisms collectively regulate the freshwater flux imprint within the mixed layer, driving distinct salinity patterns across ocean basins and salinity classes. Furthermore, we estimate global freshwater transport within and beyond the mixed layer, advancing our understanding of the relationship between the global water cycle and ocean salinity dynamics. These findings provide insights into the physical processes underpinning salinity amplification and its evolution by human induced climate change.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC022278","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101090","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

PIV Measurements of Turbulent Water Flows Over Fixed Low-Angle Compound Dunes Under Reversing Currents 反向流作用下固定低角复合沙丘上湍流水流的PIV测量

IF 3.4 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2025-09-15 DOI: 10.1029/2025JC022418

Gaetano Porcile, Dominique Mouazé, Pierre Weill, Aurélien Gangloff, Anne-Claire Bennis

{"title":"PIV Measurements of Turbulent Water Flows Over Fixed Low-Angle Compound Dunes Under Reversing Currents","authors":"Gaetano Porcile, Dominique Mouazé, Pierre Weill, Aurélien Gangloff, Anne-Claire Bennis","doi":"10.1029/2025JC022418","DOIUrl":"10.1029/2025JC022418","url":null,"abstract":"This study investigates the influence of surface roughness, current intensity, and direction on tidal flows over asymmetric low-angle dunes using high-resolution particle image velocimetry in a laboratory flume. Experimental measurements reveal that, consistent with previous studies, low-angle dunes generate substantial turbulence through flow expansion and shear, despite inducing only intermittent flow separation. Enhanced surface roughness and current intensity significantly increase turbulence, leading to permanent flow separation, akin to that observed over angle-of-repose dunes. When the flow direction opposes the dune's morphological orientation, weaker turbulent stresses are observed; however, flow expansion at the crest generates sufficient turbulence that persists downstream, impacting the flow field over the next dune. Hydraulic roughness parameters estimated from single and double log-law velocity profiles offer a quantitative assessment of the variability of form roughness along the dunes during both ebb and flood tides. Ejection-sweep cycles dominate turbulent flow in both aligned and opposing flow conditions, albeit with distinct spatial distributions. This study highlights crucial aspects of the interaction between dune morphology and reversing tidal currents, demonstrating that asymmetric low-angle dunes can induce significant form roughness across the different tidal phases. These findings have important implications for flow resistance and sediment transport in tidal environments.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062602","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