Journal of Geophysical Research-Oceans最新文献

Amino Acids as Indicators of Organic Matter Sources and Degradation in Suspended Matter off the Pearl River: Indications for Resuspension in the Northern South China Sea 作为珠江口悬浮物中有机物质来源和降解指标的氨基酸：南海北部再悬浮迹象

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-19 DOI: 10.1029/2024JC021519

Birgit Gaye, Niko Lahajnar, Helena C. Frazão, Marc Metzke, Carolin Perkuhn, Ralf Prien, Shichao Tian, Joanna J. Waniek

{"title":"Amino Acids as Indicators of Organic Matter Sources and Degradation in Suspended Matter off the Pearl River: Indications for Resuspension in the Northern South China Sea","authors":"Birgit Gaye, Niko Lahajnar, Helena C. Frazão, Marc Metzke, Carolin Perkuhn, Ralf Prien, Shichao Tian, Joanna J. Waniek","doi":"10.1029/2024JC021519","DOIUrl":"https://doi.org/10.1029/2024JC021519","url":null,"abstract":"Suspended matter (SPM) was sampled in a grid off the Pearl River mouth in the northern South China Sea (SCS). SPM concentrations and the content of total organic carbon (TOC), total nitrogen (TN), amino acids (AA) and hexosamines (HA) and derived biogeochemical indicators were used to study organic matter sources on the shelf and slope. A surface SPM maximum curtailed the water mass of mixed riverine and marine origin off the Pearl River mouth with salinities <30. SPM in this river plume was rich in organic matter of fresh planktic origin. In areas outside the river plume chlorophyll (Chl-a) maxima were found at the subsurface nutricline. The AA composition shows that the degradation state of organic matter is very similar in all samples except in bottom water samples. Rather than degradation indicators, an indicator of SPM residence time in the ocean shows differences between samples from the upper 200 m and the deeper SPM samples. On the shelf and the shelf break a distinct SPM maximum was found above the sea floor. AA and HA spectra revealed that its organic matter was more degraded than the other SPM samples and that part of the organic matter in the bottom water turbidity maximum originated from the fine fraction of sediments. The state of organic matter implies that degradation of this resuspended material possibly adds to bottom water hypoxia; furthermore, contaminants originally deposited in shelf sediments can be redistributed into distal areas of the South China Sea.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021519","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861924","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

A Multi-Decade Tracer Study of the Circulation and Spreading Rates of Atlantic Water in the Arctic Ocean

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-18 DOI: 10.1029/2023JC020738

A. Pasqualini, P. Schlosser, R. Newton, W. M. Smethie Jr., R. Friedrich

{"title":"A Multi-Decade Tracer Study of the Circulation and Spreading Rates of Atlantic Water in the Arctic Ocean","authors":"A. Pasqualini, P. Schlosser, R. Newton, W. M. Smethie Jr., R. Friedrich","doi":"10.1029/2023JC020738","DOIUrl":"https://doi.org/10.1029/2023JC020738","url":null,"abstract":"In this contribution, we present tritium-3He (3H-3He) apparent ages and hydrographic data from 21 expeditions spanning 27 years of Arctic Ocean section work (1987–2013) to estimate flow paths and spreading velocities of the Atlantic Waters (AW) circulation on a pan-Arctic scale. Tracer data not only corroborate the well-organized cyclonic flow along the continental slope but also introduce a temporal dimension to these observations. Additionally, they provide insights into other circulation branches of the Atlantic layer, which are hypothesized to be influenced by deep submarine ridges. Tracer measurements indicate that mean spreading rates vary across different branches of the circulation pattern. Along the boundary current, spreading velocities range from approximately 0.7 to 1.5 cm s−1, with no significant difference observed between the waters of the two vertically stacked Atlantic branches. Within the limits of our method, tracer data support the hypothesis originally proposed by Rudels et al. (1994), https://doi.org/10.1029/gm085p0033—of stable pathways in the Atlantic Layer, influenced by topographic constraints.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JC020738","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861453","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

Typhoon-Induced Near-Inertial Waves Around Miyakojima Island in 2015 2015 年台风在宫古岛附近引发的近惯性波浪

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-17 DOI: 10.1029/2024JC021169

Hua Zheng, Xiao-Hua Zhu, Hirohiko Nakamura, Jae-Hun Park, Chanhyung Jeon, Chuanzheng Zhang, Ruixiang Zhao, Ze-Nan Zhu, Ayako Nishina, Hong Sik Min, Dong Guk Kim, Hanna Na, Yu-Xiang Qiao, Naoki Hirose

{"title":"Typhoon-Induced Near-Inertial Waves Around Miyakojima Island in 2015","authors":"Hua Zheng, Xiao-Hua Zhu, Hirohiko Nakamura, Jae-Hun Park, Chanhyung Jeon, Chuanzheng Zhang, Ruixiang Zhao, Ze-Nan Zhu, Ayako Nishina, Hong Sik Min, Dong Guk Kim, Hanna Na, Yu-Xiang Qiao, Naoki Hirose","doi":"10.1029/2024JC021169","DOIUrl":"https://doi.org/10.1029/2024JC021169","url":null,"abstract":"In 2015, four typhoons traversed the regions surrounding the Ryukyu Island Chain, resulting in different near-inertial waves (NIWs), the characteristics of which were investigated through in situ observations around Miyakojima Island and numerical simulations covering the East Asian marginal seas. The spatial distribution of typhoon-induced near-inertial motions was significantly correlated with the typhoon tracks and background currents. Typhoons Chan-hom and Goni traversed the observation transect, resulting in different spatial patterns of NIWs owing to their different tracks. Observations on both the western and eastern sides of the Ryukyu Island Chain failed to capture NIWs after typhoon Chan-hom, because they were positioned to the left of the typhoon track where near-inertial motions were enhanced only in the upper 50 m. In contrast, NIWs were negligible on the left side and energetic on the right side of typhoon Goni. Despite being hundreds of kilometers from the observation transect, typhoons Soudelor and Dujuan induced NIWs with higher energy levels than those induced by typhoons Chan-hom and Goni. The energy propagation of NIWs after typhoons Soudelor and Dujuan was significantly influenced by background currents. The western boundary currents, including the Kuroshio and Ryukyu Currents, create negative relative vorticity on their right, which works like a waveguide for the poleward advection of NIWs. However, the Ryukyu Current can be impeded by westward-propagating cyclonic eddies from the North Pacific, which further disrupts the waveguide.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861370","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 Roles of Nutrient Loading and River Discharge on the Phytoplankton Dynamics in the Semi-Enclosed Sea

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-15 DOI: 10.1029/2024JC021466

Ruohan Sun, Xinyi Kang, Meng Xia

{"title":"The Roles of Nutrient Loading and River Discharge on the Phytoplankton Dynamics in the Semi-Enclosed Sea","authors":"Ruohan Sun, Xinyi Kang, Meng Xia","doi":"10.1029/2024JC021466","DOIUrl":"https://doi.org/10.1029/2024JC021466","url":null,"abstract":"Understanding spatiotemporal variations in phytoplankton biomass is crucial to the health of marine ecosystems. Therefore, the Finite Volume Community Ocean Model (FVCOM)-based Ecological Model (Integrated Compartment Model) was implemented to assess nutrient and phytoplankton dynamics in the Bohai Sea from 2010 to 2019. From 2010 to 2013, dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) levels in the Bohai Sea were higher (∼0.400 and 0.030 mg/L, respectively) in nearshore areas compared to other years. During the summer and fall, the spatial distribution of the DIN/DIP ratio in the Bohai Sea exhibited a double-core structure. Higher values (>100) were primarily concentrated in the central region of the Liaodong Bay and south of the Central Basin near the Yellow River Estuary. Statistical analyses and numerical experiments revealed that increasing DIP loading from rivers had a greater effect on phytoplankton biomass in the Laizhou and Bohai Bays than increasing DIN loading. However, the phytoplankton biomass in the Liaodong Bay was strongly influenced by both increasing DIN and DIP loading from rivers. Notably, the increase in phytoplankton biomass resulting from increasing DIN loading exceeded that from increasing DIP loading by 17% in the Liaodong Bay. The reduction in river discharge weakened circulation at the river mouths, thereby partially retaining surface phytoplankton. This was more predominant in the nearshore areas of the Yellow River owing to the higher river discharge in August 2019. This study provides valuable insights for the management and conservation of marine ecosystems.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861018","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

Mixing of Top-Down and Bottom-Up Diffusing Reactive Tracers Within the Ocean Mixed Layer and Its Application to Autumn Phytoplankton Blooms 海洋混合层内自上而下和自下而上扩散的反应性示踪剂的混合及其在秋季浮游植物繁殖中的应用

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-13 DOI: 10.1029/2024JC021757

Y. Noh, H. J. Seunu, H. Song, Y. Choi

{"title":"Mixing of Top-Down and Bottom-Up Diffusing Reactive Tracers Within the Ocean Mixed Layer and Its Application to Autumn Phytoplankton Blooms","authors":"Y. Noh, H. J. Seunu, H. Song, Y. Choi","doi":"10.1029/2024JC021757","DOIUrl":"https://doi.org/10.1029/2024JC021757","url":null,"abstract":"The mixing of reactive tracers within the ocean mixed layer, phytoplankton transported downwards from the sea surface and nutrients transported upwards from the mixed layer depth (MLD), is investigated using large eddy simulation coupled to a Lagrangian plankton model. The study focuses on how vertical and horizontal heterogeneity in tracer distribution is generated and how it influences an autumn phytoplankton bloom. The vertical gradient appears in the profiles of horizontal mean phytoplankton and nutrient concentrations, P and N, and it reduces phytoplankton production by photosynthesis compared to the cases with uniform distributions. The reduction ratio decreases as the mixed-layer mean N increases, but it remains relatively insensitive to other conditions such as MLD, surface forcing, stratification below the mixed layer, and the initial N. Phytoplankton and nutrient concentrations show a negative correlation in the horizontal plane, which becomes stronger with increasing depth. Its contribution to plankton production by photosynthesis is negligible, however, because the correlation is weak near the sea surface and the reaction time scale is much longer than the turbulent mixing time scale. It is also found that the vertical gradients of P and N are smaller, and the negative correlation is stronger in the convective mixed layer than in the shear-driven mixed layer. A simple box plankton model, which takes into account the mixing process of tracers, is proposed and used to investigate how mixing affects the prediction of an autumn phytoplankton bloom.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861187","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

Consistent Initial Error Modes Causing the Largest Prediction Errors and the Strongest Predictability Barrier for Two Types of El Niño Events in CMIP6

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-13 DOI: 10.1029/2024JC021633

Jingjing Zhang, Shujuan Hu, Wansuo Duan, Jianjun Peng, Meiyi Hou

{"title":"Consistent Initial Error Modes Causing the Largest Prediction Errors and the Strongest Predictability Barrier for Two Types of El Niño Events in CMIP6","authors":"Jingjing Zhang, Shujuan Hu, Wansuo Duan, Jianjun Peng, Meiyi Hou","doi":"10.1029/2024JC021633","DOIUrl":"https://doi.org/10.1029/2024JC021633","url":null,"abstract":"Based on the coupled conditional nonlinear optimal perturbation (C-CNOP) method, this study explores the season-dependent predictability barrier (PB) affecting the forecasts of two types of El Niño (central Pacific, CP; eastern Pacific, EP) events by using CMIP6 models. It is found that CP (EP) El Niño forecasts often occurs summer (spring) PB, and only powerful season-dependent PB can lead to large prediction errors. Further investigating the initial causes of the largest prediction errors and strongest PB, we find that the spatial pattern of initial errors consistently exhibits the sea temperature anomaly dipole of east positive–west negative in the equatorial Pacific, and errors over upper layers of North (South) Pacific are similar to the negative Victoria mode (South Pacific Meridional Mode). Physically, the mode evolution of initial errors in the equatorial Pacific, North and South Pacific are all positive feedback processes, which together ultimately lead to large cold biases over the central-eastern (CP) or eastern (EP) equatorial Pacific in December. Analysis shows that the initial error mode of North Pacific mainly affects the cold bias of the central Pacific, whereas the mode of South Pacific mostly controls the bias in the eastern Pacific. These initial error modes found in this study can have more serious impacts on forecasts of two types of El Niño events than that in previous studies. The results of this study offer valuable scientific guidance for the adaptive observation of ENSO, which will likely be able to maximize the prediction skills for two types of El Niño events.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861189","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

Impact of Temperature and Stratification, Modulated by Warming Tsushima Warm Current, on the Spatiotemporal Distribution of Picoplankton in the Northern East China Sea

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-13 DOI: 10.1029/2024JC021649

Yoonja Kang, Chan-Woo Kwon, Eunbi Lee, Yeongji Oh, Yang-Ki Cho, Chung Il Lee, Hyeong Kyu Kwon, Guebuem Kim, Minji Lee, Weol-Ae Lim, Chang-Keun Kang

{"title":"Impact of Temperature and Stratification, Modulated by Warming Tsushima Warm Current, on the Spatiotemporal Distribution of Picoplankton in the Northern East China Sea","authors":"Yoonja Kang, Chan-Woo Kwon, Eunbi Lee, Yeongji Oh, Yang-Ki Cho, Chung Il Lee, Hyeong Kyu Kwon, Guebuem Kim, Minji Lee, Weol-Ae Lim, Chang-Keun Kang","doi":"10.1029/2024JC021649","DOIUrl":"https://doi.org/10.1029/2024JC021649","url":null,"abstract":"The northern East China Sea is one of the Large Marine Ecosystems, which experiences the fastest ocean warming across the globe. With the anticipation of stimulated Tsushima Warm Current (TWC) transport and rapid ocean warming, the importance of picoplankton will increase in this ecosystem. Thus, the spatiotemporal distribution of picoplankton was investigated in the northern East China Sea, where variability of TWC can modulate temperature and stratification. High contributions of warm and less saline Tsushima Surface Warm Water (TSWW) increased water temperature and stratification. Picoplankton were responsible for 75% of the relative contribution of chl a. PicoC:PicoChla ratios increased with distance from the coasts and fluctuated with depth, indicating that an elevated contribution of Tsushima Warm Water diminished the photosynthetic activity of picoplankton. Synechococcus I population decreased with salinity. High contribution of TSWW increased Prochlorococcus and Synechococcus II population, related with stratification and rising temperature driven by TSWW, respectively. Picoplankton-derived carbon contents were mostly attributed either to picoeukaryotes or to Synechococcus depending on the TSWW contribution. This suggests that the rising TSWW contribution can intensify the role of Synechococcus in picoplankton-derived organic matter in the northern East China Sea.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861110","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 Interannual Variability of Antarctic Fast-Ice Thickness in McMurdo Sound and Connections to Climate 麦克默多湾南极速冻冰厚度的年际变化及其与气候的关系

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-13 DOI: 10.1029/2023JC020134

Maren Elisabeth Richter, Greg H. Leonard, Inga J. Smith, Pat J. Langhorne, Matthew Parry

{"title":"The Interannual Variability of Antarctic Fast-Ice Thickness in McMurdo Sound and Connections to Climate","authors":"Maren Elisabeth Richter, Greg H. Leonard, Inga J. Smith, Pat J. Langhorne, Matthew Parry","doi":"10.1029/2023JC020134","DOIUrl":"https://doi.org/10.1029/2023JC020134","url":null,"abstract":"Land-fast sea-ice (fast ice) in McMurdo Sound grows through heat loss to the atmosphere and through heat loss to the ocean due to the presence of supercooled water. In this paper, we present a fast-ice thickness data set covering 1986–2022, providing a baseline of interannual variability in fast-ice thickness. Fast ice thicknesses are related to atmospheric and oceanic drivers on monthly and seasonal timescales to provide one of the longest timeseries of drivers of interannual fast-ice thickness variability from high-quality, in situ observations. We select a 14 km by 20 km area of level fast-ice over which atmospheric and oceanic drivers have negligible spatial variation, allowing us to resolve temporal variability in drivers and thickness. A statistical significance testing approach is adopted which only considers drivers that have a plausible physical mechanism to influence fast-ice thickness. We demonstrate that the fast-ice cover in McMurdo Sound is thicker in years when surface air temperature is colder, average (southerly) wind speed is higher, and there are fewer southerly storms. Nonetheless, we show that monthly averaged drivers have limitations and often do not produce strong correlations with thickness or fast-ice persistence. Consequently, most of the variability in fast-ice thickness cannot be explained by a single driver. No long-term trend in fast-ice thickness was found in eastern McMurdo Sound, thickness being influenced by a combination of drivers. Future event-based analyses, relating storms to fast-ice persistence, are needed. The present study provides a baseline against which these extreme events and long-term trends can be assessed.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JC020134","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861109","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

Water Mass Transformation and Its Relationship With the Overturning Circulation in the Eastern Subpolar North Atlantic 东亚极地北大西洋的水团变化及其与翻转环流的关系

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-13 DOI: 10.1029/2024JC021222

Yao Fu, M. Susan Lozier, Sudip Majumder, Tillys Petit

{"title":"Water Mass Transformation and Its Relationship With the Overturning Circulation in the Eastern Subpolar North Atlantic","authors":"Yao Fu, M. Susan Lozier, Sudip Majumder, Tillys Petit","doi":"10.1029/2024JC021222","DOIUrl":"https://doi.org/10.1029/2024JC021222","url":null,"abstract":"A recent study using the first 21 months of the OSNAP time series revealed that the export of dense waters in the eastern subpolar North Atlantic―as part of the Atlantic Meridional Overturning Circulation (MOC)―can be almost wholly attributed to surface-forced water mass transformation (SFWMT) in the Irminger and Iceland basins, thus suggesting a minor role for other means of transformation, such as diapycnal mixing. To understand whether this result is valid over a period that exceeds the current observational record, we use four different ocean reanalysis products to investigate the relationship between surface buoyancy forcing and dense water production in this region. We also reexplore this relationship with the now available 6-year OSNAP time series. Our analysis finds that although surface transformation in the eastern subpolar gyre dominates the production of deep waters, mixing processes downstream of the Greenland Scotland Ridge are also responsible for the production of waters carried within the AMOC's lower limb both in the observations and reanalyses. Further analysis of the reanalyses shows that SFWMT partly explains MOC interannual variability, the remaining portion can be attributed to basin storage and mixing. Compared to the observations, the reanalyses exhibit stronger MOC variance but comparable SFWMT variance on interannual timescales.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021222","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861188","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

Dispersal of the Changjiang River Water in East Asian Shelf Seas 长江水在东亚大陆架海域的扩散

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2024-12-12 DOI: 10.1029/2024JC021351

Peng Cheng

{"title":"Dispersal of the Changjiang River Water in East Asian Shelf Seas","authors":"Peng Cheng","doi":"10.1029/2024JC021351","DOIUrl":"https://doi.org/10.1029/2024JC021351","url":null,"abstract":"River plumes are crucial in transporting terrestrial materials from rivers to oceans. Knowledge gaps, however, still exist in understanding the transport pathway and the ultimate fate of riverine water in coastal oceans. This study conducted a 50-year climatological numerical simulation to investigate the long-term transport processes of Changjiang River water in the East Asian shelf seas. The Changjiang River water exhibits distinct seasonal patterns near the estuary mouth and in the coastal area south of the estuary, and it tends to be retained within the shelf seas, which influences its far-field transport. The Changjiang River water takes less than 1 year to reach the eastern shelf edge of the East China Sea and over 12 years to enter the Bohai Sea. The Kuroshio current impedes the cross-shelf transport of Changjiang water, with water in the Kuroshio region over 6 years old. The Taiwan Warm Current not only acts as a barrier that regulates the pathways of Changjiang River water but also serves as an important conduit for water exiting the East China Sea. The Changjiang River water leaves the estuary through four branches, forming eight major transport pathways in the Yellow and East China Seas. Approximately 85% of Changjiang River water flows through the Tsushima/Korea Straits, about 14% exits from the shelf edge of the East China Sea, and less than 1% passes through the Taiwan Strait. The results underscore the importance of water renewal and shelf circulation in the long-term transport of river water within coastal oceans.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 12","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860886","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