Journal of Geophysical Research-Oceans最新文献_第9页

New Generation Site and Estimated Propagation of Nonlinear Internal Waves Under Varying Background Stratification in the Northeastern East China Sea 东海东北部不同背景层积条件下非线性内波新一代位置及传播估计

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-03 DOI: 10.1029/2024JC021497

Seung-Woo Lee, SungHyun Nam, Suyun Noh

{"title":"New Generation Site and Estimated Propagation of Nonlinear Internal Waves Under Varying Background Stratification in the Northeastern East China Sea","authors":"Seung-Woo Lee, SungHyun Nam, Suyun Noh","doi":"10.1029/2024JC021497","DOIUrl":"https://doi.org/10.1029/2024JC021497","url":null,"abstract":"This study investigates the generation and propagation of nonlinear internal waves (NLIWs) in the northeastern East China Sea (ECS), focusing on the impact of time-varying background stratification. Using satellite imagery and tide-generating body force, 327 groups of NLIWs were identified from 93 MODIS images collected between 2015 and 2019 and classified into three distinct types based on their propagation directions—Type-A (∼42%), Type-B (∼38%), and Type-C (∼20%)—each originating from different generation sites. Type-B NLIWs were found to originate from a newly identified site near southwestern Fukue Island reported here for the first time, whereas Type-A and Type-C originated from the northern Okinawa Trough and southwestern Jeju Island, respectively. Seasonal variations in NLIW propagation speed using historical CTD data revealed an increase in the speed from winter to spring and fall, peaking in summer due to strong stratification. Although spatial distribution varied by season, propagation was generally faster in the eastern region than in the western region attributed to deeper thermoclines and higher density gradients. During field observation in May 2015, the observed NLIWs had an amplitude of 5–6 m, a characteristic width of 380–450 m, southwestward propagating directions, and a speed of ∼0.54 m s−1. An empirical model, used to track and predict these waves, confirmed their generation locations from southwestern Fukue Island (Type-B) and indicated fast arrival speeds, influenced by time-varying stratification conditions during the stratification period. These findings highlight the impacts of varying background conditions on NLIW propagation and would facilitate their prediction.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021497","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142764201","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

Coupled Impact of Climate Change and Anthropogenic Activity on the Changes of Terrestrial Organic Carbon Accumulation in the River-Dominated Coastal Margin 气候变化和人类活动对河流主导的海岸带陆相有机碳积累变化的耦合影响

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-03 DOI: 10.1029/2024JC021114

Li Jiang, Limin Hu, Yazhi Bai, Jiazong Du, Naishuang Bi, Xiao Wu, Xueshi Sun, Zhigang Guo, Houjie Wang, Zuosheng Yang

{"title":"Coupled Impact of Climate Change and Anthropogenic Activity on the Changes of Terrestrial Organic Carbon Accumulation in the River-Dominated Coastal Margin","authors":"Li Jiang, Limin Hu, Yazhi Bai, Jiazong Du, Naishuang Bi, Xiao Wu, Xueshi Sun, Zhigang Guo, Houjie Wang, Zuosheng Yang","doi":"10.1029/2024JC021114","DOIUrl":"https://doi.org/10.1029/2024JC021114","url":null,"abstract":"River-dominated marginal seas play a crucial role in the global carbon cycle. However, the centennial burial record of organic carbon (OC) remains unclear. In this study, we conducted a comprehensive analysis of bulk OC, its isotopic composition (δ13C and Δ14C), biomarkers (lignin and n-alkanes), and sedimentological evolution based on sediment core from the Yellow River-dominated Bohai Sea (BS). We also compiled several published OC burial records from other river-dominated coastal margins. Our findings indicated that since the 1950s, the accumulation of terrestrial OC in central BS has shown a concurrent decline, as evidenced by a ∼50% decrease in terrigenous/aquatic ratio of n-alkanes (TAR), which accompanied by a significant reduction in sediment load due to the watershed human activities. More intense erosion and resuspension due to stronger hydrodynamic condition under the increasing frequency of winter storms could account for the observed sediment coarsening and concomitant increase of the degraded lignin and old-OC since the 1980s, suggesting that delta erosion-induced sediment redistribution could influence the selective transport and accumulation of the more woody allochthonous OC components. The temporal profiles of lignin records indicated a spatial heterogeneity of recent terrestrial OC burial among the large river-dominated coastal margins under the enhanced global delta erosion. Compared to the fluvial input-dominated OC burial in the Yangtze River, Pearl River and Mississippi River delta margins, a more hydrodynamic forcing impact on the terrestrial OC burial was discerned in the BS due to the coupled effect of recent climate change and substantial decline in sediment load.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142764305","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

Reservoir Regulation Changed Terrestrial Particulate Organic Carbon Transport and Burial Processes off the Yellow River Mouth 水库调节改变了黄河口陆相颗粒有机碳运输和埋藏过程

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-02 DOI: 10.1029/2024JC021700

Jinya Xu, Houjie Wang, Xiao Wu, Shuai Cong, Taian Lu, Li Jiang, Limin Hu, Naishuang Bi

{"title":"Reservoir Regulation Changed Terrestrial Particulate Organic Carbon Transport and Burial Processes off the Yellow River Mouth","authors":"Jinya Xu, Houjie Wang, Xiao Wu, Shuai Cong, Taian Lu, Li Jiang, Limin Hu, Naishuang Bi","doi":"10.1029/2024JC021700","DOIUrl":"https://doi.org/10.1029/2024JC021700","url":null,"abstract":"The dynamic behavior of particulate organic carbon (POC) is crucial for understanding biogeochemical carbon cycling in coastal and oceanic environments. However, intense watershed human activities have significantly altered the POC transport and burial in the estuary-coast continuum. Here, we developed a novel parameterization scheme that incorporates grain-size constraints to investigate the dispersal and accumulation processes of POC off the Yellow River mouth during the water-sediment regulation scheme (WSRS) using a three-dimensional hydrodynamic model (FVCOM). The result shows that the model successfully captures the offshore transport and hydrodynamic sorting of POC, which leads to a progressive increase in POC content with offshore dispersion and significant variations in POC and sediment deposition across different isobaths. Rapid fluctuations in river discharge and sediment composition during WSRS stages result in noticeable differences in sedimentation patterns for sediment and POC. At the Water-regulation stage, distinct differences are observed in the distribution of riverine POC and sediment across various isobaths. In contrast, during the Sediment-regulation stage, these differences are significantly reduced due to the finer riverine sediment. Compared to the sediment-regulation, the Water-regulation plays a crucial role in enhancing the effective burial of POC. Coarse-grained sediment can form an armored layer that protects OC from disturbance. Additionally, increased runoff during this stage promotes the offshore transport of POC to a less energetic environment (>10 m in depth). This study provides valuable insights into POC dynamics in high-turbidity estuarine and coastal environments. It underscores the importance of employing comprehensive modeling approaches to elucidate these complex processes.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142764193","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

Understanding Tidal Jet Vortices Over Complex Bathymetry via Numerical Modeling and Drone Observation: Match and Mismatch in the Vortex Dynamics Under Idealized and Realistic Topographic Settings 通过数值模拟和无人机观测了解复杂水深上的潮汐射流涡：在理想和现实地形设置下涡动力学的匹配和不匹配

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-02 DOI: 10.1029/2024JC021523

Sooncheol Hwang, Byoungjoon Na, Sangyoung Son

{"title":"Understanding Tidal Jet Vortices Over Complex Bathymetry via Numerical Modeling and Drone Observation: Match and Mismatch in the Vortex Dynamics Under Idealized and Realistic Topographic Settings","authors":"Sooncheol Hwang, Byoungjoon Na, Sangyoung Son","doi":"10.1029/2024JC021523","DOIUrl":"https://doi.org/10.1029/2024JC021523","url":null,"abstract":"The formation and evolution of tidal jet vortices over complex bathymetry were investigated using numerical modeling and in situ observation. Delft3D FM simulation on an unstructured grid system, complemented by field measurements using recreational drones captured tidal dynamics in the Uldolmok Strait, known for its strong tidal currents up to 6.0 m/s and turbulent whirlpool formation. This study particularly focused on temporal changes in whirlpools near their narrowest points. Modeling across the entire strait showed current velocity fields consistent with field observations, revealing significant temporal and spatial variability influenced by strait geometry and bathymetry. Whirlpools induced by tides were identified by setting a swirl strength threshold, with their centroids and equivalent spherical diameters pinpointed. It was observed that larger whirlpools, upon reaching critical size, were entrained and shifted with the tidal jet at about half its maximum velocity, while smaller vortices separated from the nearshore boundary layer remained nearly stationary. Focusing on the initiation of whirlpools and their relations with the coastline and bathymetry, a targeted field survey using a recreational drone measured surface flow fields in detail near the strait's narrowing region. During the ebb phase, shallow regions exhibited numerous smaller eddies due to increased energy dissipation, showing a dual power-law scaling in the size distribution of eddies, contrasting with the single scaling exponent observed during the flood phase. The study underscored the role of coastline and bathymetry in developing whirlpools and shaping their dynamics, providing insights into complex tidal interactions in the natural coast.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021523","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142764194","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

Scenario Superposition Method for Real-Time Tsunami Prediction Using a Bayesian Approach 基于贝叶斯方法的海啸实时预测情景叠加方法

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-01 DOI: 10.1029/2024JC021565

Saneiki Fujita, Reika Nomura, Shuji Moriguchi, Yu Otake, Randall J. LeVeque, Kenjiro Terada

{"title":"Scenario Superposition Method for Real-Time Tsunami Prediction Using a Bayesian Approach","authors":"Saneiki Fujita, Reika Nomura, Shuji Moriguchi, Yu Otake, Randall J. LeVeque, Kenjiro Terada","doi":"10.1029/2024JC021565","DOIUrl":"https://doi.org/10.1029/2024JC021565","url":null,"abstract":"In this study, we propose a scenario superposition method for real-time tsunami wave prediction. In the offline phase, prior to actual tsunami occurrence, hypothetical tsunami scenarios are created, and their wave data are decomposed into spatial modes and scenario-specific coefficients by the singular value decomposition. Then, once an actual tsunami event is observed, the proposed method executes an online phase, which is a novel contribution of this study. Specifically, the predicted waveform is represented by a linear combination of training scenarios consisting of precomputed tsunami simulation results. To make such a prediction, a set of weight parameters that allow for appropriate scenario superposition is identified by the Bayesian update process. At the same time, the probability distribution of the weight parameters is obtained as reference information regarding the reliability of the prediction. Then, the waveforms are predicted by superposition with the estimated weight parameters multiplied by the waveforms of the corresponding scenarios. To validate the performance and benefits of the proposed method, a series of synthetic experiments are performed for the Shikoku coastal region of Japan with the subduction zone of the Nankai Trough. All tsunami data are derived from numerical simulations and divided into a training data set used as scenario superposition components and a test data set for an unknown real event. The predicted waveforms at the synthetic gauges closest to the Shikoku Islands are compared to those obtained using our previous prediction method incorporating sequential Bayesian updating.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021565","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762051","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

Influence of the Southern Hemisphere Supergyre on Antarctic Intermediate Water Properties in CMIP6 Models 南半球超级环流对CMIP6模式中南极中间水性质的影响

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-01 DOI: 10.1029/2024JC021140

Ophélie Meuriot, Camille Lique, Yves Plancherel

{"title":"Influence of the Southern Hemisphere Supergyre on Antarctic Intermediate Water Properties in CMIP6 Models","authors":"Ophélie Meuriot, Camille Lique, Yves Plancherel","doi":"10.1029/2024JC021140","DOIUrl":"https://doi.org/10.1029/2024JC021140","url":null,"abstract":"The supergyre in the Southern Hemisphere is thought to connect the Atlantic, Indian, and Pacific subtropical gyres together. The aim of the study is to investigate whether the supergyre is identifiable in the Coupled Model Intercomparison Project Phase 6 (CMIP6) models and in the Estimating the Circulation and Climate of the Ocean (ECCO) reanalysis and to evaluate the influence of the supergyre on the properties of Antarctic Intermediate Water (AAIW), the dominant water mass at intermediate depths in the Southern Hemisphere. CMIP6 models and ECCO are in agreement at the surface with supergyres connected across all basins but present some differences at depth in both position and strength. AAIW core properties (temperature and salinity) present a high degree of similarity across basins within the supergyre but not outside of it. By the end of the century, the supergyre reduces in size and intensifies at intermediate depths, and the AAIW core depth warms in all basins and freshens in the Pacific although no clear trend in salinity can be found in the Atlantic and Indian basins in the SSP5-8.5 scenario. The high degree of similarity across basins within the supergyre is maintained in the future scenario. The results suggest that by connecting the basins together at intermediate depth, the supergyre plays a key role in circulating and homogenizing the AAIW core properties. Our results emphasize the role of the supergyre in circulating water masses at the surface and intermediate depths in CMIP6 models and hence its importance to the global circulation.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021140","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762048","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

Accelerated Basal Melt Rates of Ice Shelves in North Greenland From 2013 to 2022 Estimated With the High-Resolution ArcticDEM 2013 - 2022年格陵兰北部冰架基底加速融化速率的高分辨率ArcticDEM估算

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-01 DOI: 10.1029/2024JC021509

Genyu Wang, Chang-Qing Ke, Yubin Fan, Xiaoyi Shen, Vahid Nourani, Adarsh Sankaran, Ali Danandeh Mehr, Sergey V. Popov

{"title":"Accelerated Basal Melt Rates of Ice Shelves in North Greenland From 2013 to 2022 Estimated With the High-Resolution ArcticDEM","authors":"Genyu Wang, Chang-Qing Ke, Yubin Fan, Xiaoyi Shen, Vahid Nourani, Adarsh Sankaran, Ali Danandeh Mehr, Sergey V. Popov","doi":"10.1029/2024JC021509","DOIUrl":"https://doi.org/10.1029/2024JC021509","url":null,"abstract":"Basal melting of ice shelves has become one of the main causes of mass loss from the Greenland ice sheet. However, most studies have focused on individual ice shelves, making it difficult to gain a more comprehensive understanding of basal melting across Greenland ice shelves. To address this issue, we utilized timestamped ArcticDEM strip data coregistered with ICESat-2 data to estimate the basal melt rates of the ice shelves in North Greenland at a resolution of 150 m from 2013 to 2022, employing a mass conservation approach within the Lagrangian framework. Additionally, to investigate the influence of temperature on basal melt rates, a basic analysis correlating the basal melt rates with temperatures was conducted. Overall, the mass loss caused by basal melting of the six ice shelves has amounted to 27.86 ± 35.63 Gt yr−1, accounting for approximately 90% of the non-calving mass loss, equivalent to a sea level rise of 0.08 ± 0.10 mm yr−1, far exceeding surface mass loss and glacier calving. The two larger ice shelves, Petermann and 79° North (79N), have contributed to 85% of the basal melt mass loss. Regarding the spatiotemporal distribution, the basal melt rates have gradually decreased from near the grounding line to the ice shelf front. Apart from the Ryder ice shelves, the basal melting of the other ice shelves is in a state of accelerated ablation. Moreover, compared to the skin temperature of the ice shelf, the sea water potential temperature has a greater impact on the basal melt rate.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762050","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

Contribution of Anthropogenic and Lithogenic Aerosol Fe in the East China Sea 人为和岩石区气溶胶铁在东海的贡献

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-01 DOI: 10.1029/2024JC021113

Chih-Chiang Hsieh, Tung-Yuan Ho

引用次数: 0

The South Sandwich Tsunami of 12 August 2021: An Underestimated Widespread Tsunami Hazard Around the World 2021年8月12日的南三明治海啸：被低估的全球广泛海啸危害

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-11-30 DOI: 10.1029/2024JC021433

J. H. M. Roger, A. Jamelot, H. Hébert, W. Power, A. Gusman, B. E. O. Thomas

{"title":"The South Sandwich Tsunami of 12 August 2021: An Underestimated Widespread Tsunami Hazard Around the World","authors":"J. H. M. Roger, A. Jamelot, H. Hébert, W. Power, A. Gusman, B. E. O. Thomas","doi":"10.1029/2024JC021433","DOIUrl":"https://doi.org/10.1029/2024JC021433","url":null,"abstract":"On 12 August 2021 a large Mw 8.1 earthquake, detected by global seismic networks, occurred on the South Sandwich subduction zone in the southern Atlantic Ocean. Approximately 1.5 hr later, a tsunami was clearly recorded on King Edward Point coastal tide gauge (South Georgia Island), approximately 800 km north-west of the earthquake location. Subsequently it was recorded on other coastal stations both in the Atlantic Ocean, and also in the Indian and Pacific Oceans. A careful and systematic analysis of coastal and deepwater sea-level records highlights three points: (a) the tsunami propagated across four oceans following major submarine features; (b) despite its very low amplitude, it reached as far as the Canary Islands in the Atlantic Ocean, Hawaii and the US West coast as far as Alaska and the Aleutian Islands in the Pacific Ocean; (c) it was recorded twice on New Zealand DART system NZC, with one record of the tsunami from the East and one from the West. This event is an opportunity to highlight the lack of knowledge about the South Sandwich subduction region in terms of its tsunamigenic potential and the associated tsunami hazard in the Pacific ocean. It should lead to an improvement of national tsunami warning procedures, by including this region as a tsunami source zone, for neighboring regions but also for distant countries like New Zealand or French Polynesia.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142754037","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

The Impacts of Far-Field Typhoon-Generated Coastal Trapped Waves on the Hydrodynamics in the Northern South China Sea: A Case Study of Typhoon In-Fa 远场台风近海困波对南海北部水动力的影响——以台风“仁发”为例

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-11-28 DOI: 10.1029/2024JC021359

Suan Hu, Yineng Li, Pengpeng Hu, Heng Zhang, Guang Zhang, Wenping Gong

{"title":"The Impacts of Far-Field Typhoon-Generated Coastal Trapped Waves on the Hydrodynamics in the Northern South China Sea: A Case Study of Typhoon In-Fa","authors":"Suan Hu, Yineng Li, Pengpeng Hu, Heng Zhang, Guang Zhang, Wenping Gong","doi":"10.1029/2024JC021359","DOIUrl":"https://doi.org/10.1029/2024JC021359","url":null,"abstract":"Coastal Trapped Waves (CTWs) have the potential to transmit significant energy from atmospheric wind systems, causing dramatic coastal changes over vast areas, even far from the wind systems. This study investigated the impacts of CTWs generated by Typhoon In-fa (2021) on the northern South China Sea (NSCS) hydrodynamics using tide gauge observations, reanalysis data, and numerical model outputs. The analysis results indicate that the CTWs induced by Typhoon In-fa exhibit distinct characteristics in different phases of wave crest and trough. During the crest phase, coastal currents generated by CTWs flow opposite to the background circulation, while during the trough phase, they flow in the same direction. This process is accompanied by changes in cross-shore currents, such that during the crest phase of CTWs, the cross-shore currents are landward at the surface and seaward at the bottom, while during the trough phase of CTWs, the cross-shore currents become reversed. These changes further lead to downwelling in temperature, salinity, and density during the crest phase of CTWs, and upwelling during the trough phase of CTWs. Results from a linear CTW model demonstrated that the above characteristics agreed with the traditional CTW theory. Sensitivity experiments with the Regional Ocean Model System (ROMS) explored key factors influencing NSCS hydrodynamics, including local winds and CTWs from Typhoon In-fa. The local winds and CTWs have different effects: they compete during the crest phase and co-work during the trough phase, with local winds dominating the sea surface and CTWs dominating the seabed.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748957","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