Journal of Geophysical Research-Oceans最新文献_第10页

Isopycnal Shoaling Causes Interannual Variability in Oxygen on Isopycnals in the Subarctic Northeast Pacific 等深线围浅导致亚北极东北太平洋等深线上氧气的年际变化

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-20 DOI: 10.1029/2023JC020414

Ahron A. Cervania, Roberta C. Hamme

{"title":"Isopycnal Shoaling Causes Interannual Variability in Oxygen on Isopycnals in the Subarctic Northeast Pacific","authors":"Ahron A. Cervania, Roberta C. Hamme","doi":"10.1029/2023JC020414","DOIUrl":"https://doi.org/10.1029/2023JC020414","url":null,"abstract":"Over 60 years of oceanographic observations from Ocean Station Papa (OSP) in the northeast Pacific indicate faster dissolved oxygen loss than the global average. The greatest negative trends in oxygen concentration occur on isopycnals in the upper water column (σθ = 26.1–26.8 kg m−3, ∼110–200 m) but have considerable uncertainty due to natural variability. In this paper, we use eight Argo profiling floats equipped with optode oxygen sensors to assess the 2008–2016 interannual variability of subsurface dissolved oxygen near OSP. We developed a method using high frequency Conductivity-Temperature-Depth data to correct optode profiles for slow response times and used reference profiles from the OSP time series to calibrate the optodes. Response time correction markedly improves subsurface bias caused by slow optode equilibration. Our analysis indicates that episodic shoaling of isopycnals can cause rapid reduction in dissolved oxygen concentration. Changes in ventilation, horizontal mixing, and water mass age are unlikely drivers for the rapid O2 loss events examined. We link dissolved oxygen loss during shoaling events to organic matter export, due to higher concentrations of organic matter and greater respiration rates at shallower depths. Reduced net community production during the “Blob” marine heatwave may have reduced the impact of the second shoaling event examined. Natural variations in dissolved oxygen in these layers provide context for uncertainty estimates of long-term trends and insight toward the potential for future extreme oxygen minima from the combined impact of the long-term decline and episodic shoaling.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JC020414","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141732527","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

Factors Controlling DMS Emission and Atmospheric Sulfate Aerosols in the Western Pacific Continental Sea 控制西太平洋大陆海 DMS 排放和大气硫酸盐气溶胶的因素

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-20 DOI: 10.1029/2024JC020886

Shi-Bo Yan, Gao-Bin Xu, Hong-Hai Zhang, Jian Wang, Feng Xu, Xu-Xu Gao, Jia-Wei Zhang, Jin-Wei Wu, Gui-Peng Yang

{"title":"Factors Controlling DMS Emission and Atmospheric Sulfate Aerosols in the Western Pacific Continental Sea","authors":"Shi-Bo Yan, Gao-Bin Xu, Hong-Hai Zhang, Jian Wang, Feng Xu, Xu-Xu Gao, Jia-Wei Zhang, Jin-Wei Wu, Gui-Peng Yang","doi":"10.1029/2024JC020886","DOIUrl":"https://doi.org/10.1029/2024JC020886","url":null,"abstract":"The western Pacific continental sea significantly influences the regulation of climate-active gases budget and the burden of sulfate aerosols. An underway shipboard measurement device was used to determine the dimethyl sulfide (DMS) in the surface seawater and overlying atmosphere in the East China Continental Sea. The average concentration of DMS in atmosphere and seawater was 122.8 ± 86.2pptv and 6.47 ± 3.58 nmol L−1, respectively. The variation trend of surface water DMS in the western Pacific continental sea was influenced by the abundance and composition of phytoplankton under different ocean current systems, with a significant impact from eddies on DMS production in the South China Sea. By eliminating the influence of terrestrial sources and limiting air mass transport within the marine boundary layer, strong correlations were established between atmospheric DMS and air mass exposure to chlorophyll (Echl), as well as between aerosol methanesulfonic acid (MSA) and Echl. During the aerosol sampling period, the atmospheric DMS levels (1,057 ± 371 ng/m3) were significantly higher than MSA levels (46.3 ± 59.8 ng/m3) in the East China Sea, where the conversion of DMS to MSA was not affected by changes in DMS concentration. The sea-to-air fluxes of DMS varied over a wide range, from 0.02 to 156.0 μmol m−2 d−1, with an average of 14.35 ± 18.58 μmol m−2 d−1. Marine DMS emissions play a critical role in the formation of sulfur aerosols on the western Pacific continental shelf, accounting for 24.6 ± 7.6% (14.8%–37.8%) of the total sulfate aerosols.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141732516","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

Water Exchange Through the Upper and Middle Luzon Strait Using the Sigma–Pi Diagram 利用西格玛-皮图计算吕宋海峡中上游的水交换量

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-19 DOI: 10.1029/2024JC021092

Hua Zheng, Xiao-Hua Zhu

引用次数: 0

The Periodic Cyclonic Eddy in Southwestern Taiwan and Its Interannual Variation Related to Large-Scale Climate Variations 台湾西南部周期性旋涡及其与大尺度气候变迁的年际变化

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-18 DOI: 10.1029/2023JC020818

Ziyang Gao, Xiaoqing Chu, Gengxin Chen

{"title":"The Periodic Cyclonic Eddy in Southwestern Taiwan and Its Interannual Variation Related to Large-Scale Climate Variations","authors":"Ziyang Gao, Xiaoqing Chu, Gengxin Chen","doi":"10.1029/2023JC020818","DOIUrl":"https://doi.org/10.1029/2023JC020818","url":null,"abstract":"Periodic eddies are a type of eddy that occur almost annually in fixed timeframes with similar patterns and trajectories. Nearly every year from April to June, under the combined effect of the barotropic instability of the mean flow and wind work, a cyclonic eddy (the Taiwan Cyclonic Eddy, TCE) forms in the southwest of Taiwan, then propagates westward, and finally dissipates near the Dongsha Islands. TCE exerts a significant impact on the Kuroshio intrusion into the South China Sea (SCS) and water exchange. Based on multi-year in situ and satellite observations, this study reveals the thermohaline structure and evolutionary process of the TCE. The evolutions of the three-dimensional structures of temperature, salinity, and geostrophic velocity of the TCE are analyzed based on reconstructed data. The TCE shows important interannual variations associated with El Niño–Southern Oscillation (ENSO), and the relationship between ENSO and the TCE is modulated by the Pacific Decadal Oscillation (PDO). In the negative phase of the PDO, the intensity of the TCE is significantly correlated with the Niño-3.4 index. In contrast, in the positive phase, the ENSO–TCE relationship becomes weak and non-significant. Further investigations indicate that these differences are related to the establishment of the low-latitude Pacific–East Asian Teleconnection, influencing local wind stress curl in the region. This offers a new perspective on understanding the interannual variation of periodic mesoscale eddies in the SCS.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141639626","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

Wind-Induced Quasi-Seasonal and Quasi-Monthly Variations of Near-Bottom Temperature on the Chukchi Slope of the Southwestern Canada Basin 风引起的加拿大西南部盆地楚科奇斜坡近底温度的准季节和准月度变化

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-18 DOI: 10.1029/2023JC020490

Ahyoung Ku, Chanhyung Jeon, Thomas Peacock, Jeong-Yeob Chae, Taewook Park, Kyoung-Ho Cho, Jae-Hun Park

{"title":"Wind-Induced Quasi-Seasonal and Quasi-Monthly Variations of Near-Bottom Temperature on the Chukchi Slope of the Southwestern Canada Basin","authors":"Ahyoung Ku, Chanhyung Jeon, Thomas Peacock, Jeong-Yeob Chae, Taewook Park, Kyoung-Ho Cho, Jae-Hun Park","doi":"10.1029/2023JC020490","DOIUrl":"https://doi.org/10.1029/2023JC020490","url":null,"abstract":"The time series of near-bottom temperatures collected from September 2018 until August 2020 from an array of three current- and pressure-recording inverted echo sounders showed quasi-seasonal and quasi-monthly (∼28 days) variations at a depth of ∼1,300 m near the Chukchi slope in the western Arctic Ocean. They revealed an increase of ∼0.1°C during the winter-spring period compared with the summer-fall period. These variations were observed in the data-assimilated Hybrid Coordinate Ocean Model (HYCOM) outputs near the observation site (correlation coefficient >0.7). They confirmed that variations in near-bottom temperature are related to changes in the intensity of the Atlantic Water (AW) boundary current, concurrent with the deepening of the lower AW layer by approximately 50 m. The difference in sea surface height (SSH) between the Canada Basin and the Chukchi Shelf increased because of the negative wind stress curl (WSC) and retarded the AW boundary current according to the geostrophic effect. When the near-bottom temperature increased during the winter-spring period, the SSH in the Chukchi Shelf was lower than that in the summer-fall period because of the less negative WSC. Quasi-monthly variations were related to SSH on the Chukchi Shelf owing to the negative WSC. HYCOM outputs from 1994 to 2015 showed that the AW boundary current weakened more recently than in the past due to the increased melting of sea ice. The results imply that a longer sea-ice-free season in the Arctic amplifies changes in the AW boundary current and deep ocean temperature owing to increased atmospheric forcing.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JC020490","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141639627","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

Submesoscale Kinetic Energy Induced by Vertical Buoyancy Fluxes During the Tropical Cyclone Haitang 热带气旋 "海棠 "期间垂直浮力通量诱发的次飓风动能

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-18 DOI: 10.1029/2023JC020494

Zhenhui Yi, Chunhua Qiu, Dongxiao Wang, Zhongya Cai, Jiancheng Yu, Jian Shi

{"title":"Submesoscale Kinetic Energy Induced by Vertical Buoyancy Fluxes During the Tropical Cyclone Haitang","authors":"Zhenhui Yi, Chunhua Qiu, Dongxiao Wang, Zhongya Cai, Jiancheng Yu, Jian Shi","doi":"10.1029/2023JC020494","DOIUrl":"https://doi.org/10.1029/2023JC020494","url":null,"abstract":"Submesoscale process is an important part in the kinetic energy cascade from large-scale circulation to turbulent dissipation, and a key component of the global heat budget. Its dynamic response to weather event is an important process in forecasting marine bio-chemical matter transport. So how will submesoscale instabilities response to tropical cyclones (TCs) is worth studying. Based on underwater glider observations and 1-km high resolution numerical modeling, we investigated two TCs (Roke and Haitang)-induced submesoscale baroclinic instabilities and their dynamic mechanisms in the Northern South China Sea. The TC Haitang induced significant surface cooling, mixed layer deepening, front sharpening, and enhanced the mixed layer baroclinic and symmetric instabilities. The submesoscale kinetic energy also enhanced sharply after TC Haitang, which was higher correlated with increased mesoscale strain rates. The submesoscale energetics analysis revealed that the enhanced frontal submesoscale kinetic energy after TC Haitang was mainly from potential energy release via baroclinic energy conversion. Four groups of sensitivity numerical experiments revealed that the turbulent heat buoyancy flux and the Ekman buoyancy flux contributed equally to the positive baroclinic energy conversion during the TC Haitang. This study helps us to understand the multiscale oceanic energy transfers and submesoscale air-sea interaction processes.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141639499","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

Oceanic Fronts Driven by the Amazon Freshwater Plume and Their Thermohaline Compensation at the Submesoscale 亚马孙淡水羽流驱动的海洋锋面及其在次主题尺度上的热卤补偿

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-17 DOI: 10.1029/2024JC021326

S. Coadou-Chaventon, S. Speich, D. Zhang, C. B. Rocha, S. Swart

{"title":"Oceanic Fronts Driven by the Amazon Freshwater Plume and Their Thermohaline Compensation at the Submesoscale","authors":"S. Coadou-Chaventon, S. Speich, D. Zhang, C. B. Rocha, S. Swart","doi":"10.1029/2024JC021326","DOIUrl":"https://doi.org/10.1029/2024JC021326","url":null,"abstract":"Upper ocean fronts are dynamically active features of the global ocean playing a key role in the air-sea exchanges of properties and their transport in the ocean interior. With scales ranging from the submesoscale (0.1–10 km) to the mesoscale (10–100s km) and a temporal variability from hours to months, collecting in situ observations of these structures is challenging and this has limited our understanding of their associated processes and impacts. During the EUREC4A-OA/ATOMIC field experiment, which took place in the northwest tropical Atlantic in January–February 2020, a large number of uncrewed platforms, including five Saildrones, were deployed to provide a detailed picture of the upper-ocean fine-scale variability. This region is strongly influenced by the outflow of the Amazon River, even in winter, which is the minimum outflow season. Here, the generation of fine-scale horizontal thermohaline gradients is driven by the stirring of this freshwater river input by large anticyclonic eddies, the so-called North Brazil Current Rings. Vertical shear estimates using the Saildrones ADCP show that partial temperature compensation occurs along restratifying submesoscale salinity-dominated fronts. The distribution of surface along-track gradients, as sampled by different horizontal length-scales, reveals the prevalence of submesoscale fronts. This is supported by a flattening of the spectral slopes of surface density at the submesoscale. This study emphasizes the need to resolve the upper ocean at high spatial resolution to understand its impact on the broader circulation and to properly represent air-sea interactions.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021326","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141639634","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 Role of Advection in Storm Surge for Hurricane Michael (2018) 平流在飓风迈克尔（2018 年）风暴潮中的作用

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-17 DOI: 10.1029/2024JC021105

M. V. Bilskie, R. A. Luettich Jr.

{"title":"The Role of Advection in Storm Surge for Hurricane Michael (2018)","authors":"M. V. Bilskie, R. A. Luettich Jr.","doi":"10.1029/2024JC021105","DOIUrl":"https://doi.org/10.1029/2024JC021105","url":null,"abstract":"Hurricane Michael (2018) made landfall near Mexico Beach, FL, as a Category 5 hurricane, with gauge-measured water levels over 4 m. Wind and pressure fields were created by blending a parametric near-field model with a gridded far-field model. Winds and modeled water levels were well validated across Michael's large impact a-ea. A detailed analysis of the coastal surge caused by Michael demonstrates that advection contributed significantly to Michael's highest water levels and the timing of the water level across a large portion of the Michael impact area. A momentum balance in a streamwise-normal coordinate system demonstrates that the advection contributions due to spatial gradients in the flow are identified with streamwise convergence/expansion of the flow field (Bernoulli acceleration) and curvature in the flow field (centrifugal acceleration). These effects are created by the regional geometry and the storm's wind field and are most likely to affect back barrier water levels and along curved coastlines. These findings provide an improved understanding of the role of advection in determining storm surge and, thus, the importance of including it in storm surge models.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141639523","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

Disentangling Carbon Concentration Changes Along Pathways of North Atlantic Subtropical Mode Water 解析北大西洋亚热带模式水体路径上的碳浓度变化

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-17 DOI: 10.1029/2023JC020814

Daan Reijnders, Dorothee C. E. Bakker, Erik van Sebille

{"title":"Disentangling Carbon Concentration Changes Along Pathways of North Atlantic Subtropical Mode Water","authors":"Daan Reijnders, Dorothee C. E. Bakker, Erik van Sebille","doi":"10.1029/2023JC020814","DOIUrl":"https://doi.org/10.1029/2023JC020814","url":null,"abstract":"North Atlantic subtropical mode water (NASTMW) serves as a major conduit for dissolved carbon to penetrate into the ocean interior by its wintertime outcropping events. Prior research on NASTMW has concentrated on its physical formation and destruction, as well as Lagrangian pathways and timescales of water into and out of NASTMW. In this study, we examine how dissolved inorganic carbon (DIC) concentrations are modified along Lagrangian pathways of NASTMW on subannual timescales. We introduce Lagrangian parcels into a physical-biogeochemical model and release these parcels annually over two decades. For different pathways into, out of, and within NASTMW, we calculate changes in DIC concentrations along the path (ΔDIC), distinguishing contributions from vertical mixing and biogeochemical processes. The strongest ΔDIC is during subduction of water parcels (+101 μmol L−1 in 1 year), followed by transport out of NASTMW due to increases in density in water parcels (+10 μmol L−1). While the mean ΔDIC for parcels that persist within NASTMW in 1 year is relatively small at +6 μmol L−1, this masks underlying dynamics: individual parcels undergo interspersed DIC depletion and enrichment, spanning several timescales and magnitudes. Most DIC enrichment and depletion regimes span timescales of weeks, related to phytoplankton blooms. However, mixing and biogeochemical processes often oppose one another at short timescales, so the largest net DIC changes occur at timescales of more than 30 days. Our new Lagrangian approach complements bulk Eulerian approaches, which average out this underlying complexity, and is relevant to other biogeochemical studies, for example, on marine carbon dioxide removal.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JC020814","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141639522","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 Vertical Tilt of Mesoscale Eddy in the Northern South China Sea in a High-Resolution Numerical Simulation 高分辨率数值模拟中的南海北部中尺度涡旋垂直倾斜现象

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-07-16 DOI: 10.1029/2024JC021083

Guorui Men, Xiuquan Wan, Weiwei Ma

{"title":"The Vertical Tilt of Mesoscale Eddy in the Northern South China Sea in a High-Resolution Numerical Simulation","authors":"Guorui Men, Xiuquan Wan, Weiwei Ma","doi":"10.1029/2024JC021083","DOIUrl":"https://doi.org/10.1029/2024JC021083","url":null,"abstract":"Using a high-resolution numerical model, we investigate the influence of slope topography on the vertical tilted structure of mesoscale eddies in the northern South China Sea (NSCS). The model effectively captures key features including trajectories, intensities, and three-dimensional tilted structures of these eddies. By compositing all NSCS eddies on the slope and in the basin, a more pronounced southwestward tilt in slope eddies is found from the sea surface down to the deep, compared to basin eddies. The tilt distance of slope eddies is approximately 1.8 times that of basin eddies, with the strongest eddy tilt near the Dongsha Islands. Variations in topography gradient induce noticeable changes in both the magnitude and direction of the eddy tilt. Due to potential vorticity conservation, the eddies' lower part follows isobaths, while the upper part drifts southwestward. This rapidly increases a southward eddy tilt during the upslope phase (USP) and a gradual transition to a southwestward tilt in the downslope phase (DSP). Moreover, the lower eddy part responds more significantly and earlier (about 20 days) to topography than the upper eddy part, moving faster and tilt-developing more rapidly. The lower eddy part tilts larger during the USP, roughly 2.5 times than that of the upper eddy part. In the subsequent DSP, the tilt of lower eddy part decreases, about half of that in the upper eddy part. This study reveals the complex interactions between mesoscale eddies and steep slope topography, aiding further understanding the dynamics of eddy tilt and propagation.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141631183","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