Atmosphere, earth, ocean & space, Journal Year: 2020, Volume and Issue: unknown, P. 155 - 178
Published: Jan. 1, 2020
Language: Английский
Frontiers in Marine Science, Journal Year: 2021, Volume and Issue: 8
Published: Feb. 16, 2021
This paper reviews recent advances in the circulation dynamics of Kuroshio and its interaction with shelf currents East China Sea (ECS). The annually averaged volume transport varies between 19 24 Sv, based on different observations, but there is no consensus which season peaks. intensified over central slope ECS from that off northeast Taiwan. total intrusion into estimated to be 1.3–1.4 deduced observed exchange flow Taiwan Tsushima Straits, assumption conversation shelf. However, uncertainty regarding this estimation remains due absence sufficient observations understanding dynamics. intrusions southwest Kyushu are stimulated by planetary or topographic β -effect associated alongshore variations topography altered intensity, shear stress, baroclinicity. Multilayered exchanges were found 100- 200-m isobaths along slope. spatial these governed cross-isobath geostrophy, whereas bottom Ekman may play a predominant role altering integrated Although greatly modulated path variable topography, few flows. characteristics hydrographic properties waters significantly determine general circulation, about has still not been attained.
Language: Английский
Citations
36
Frontiers in Marine Science, Journal Year: 2022, Volume and Issue: 9
Published: May 20, 2022
Details of the development coastal hypoxia in response to passage Typhoon Bavi (2020) East China Sea were reconstructed by numerical modeling using a three-dimensional coupled physical–biogeochemical model. The model was validated via repeated surveys along transect across submerged river valley off Changjiang Estuary before and after Bavi. Before Bavi’s arrival, survey data indicated that had formed Estuary. However, not eliminated but instead migrated aggravated observed typhoon passage. This phenomenon cannot be attributed typhoon-induced mixing. Simulation results reveal spatial migration mainly controlled oceanic advection. Results show stimulated regional quasi-barotropic cyclonic loop circulation downwelling reversing general summer patterns. onshore transport warmer shelf water subsequent resulted warming water. southward current induced also led hypoxic zone. Meanwhile, massive resuspended planktonic detritus from steep inner shallow bank toward occurred. study reveals typhoon-driven currents can play an important role redistribution deposited organic matter seas, which may have both short- long-term effects on marine biogeochemical environment.
Language: Английский
Citations
23
Journal of Geophysical Research Oceans, Journal Year: 2023, Volume and Issue: 128(4)
Published: March 30, 2023
Abstract The East China Sea (ECS) is a marginal sea with high productivity, especially in summer. In the Zhejiang coastal region of ECS, large phytoplankton biomass summer attributed to nutrients pumped up by upwelling (ZCU), and oceanic supplied Kuroshio intrusion (KI) onto continental ECS. However, yearly variations these two processes are not consistent, which complicates nutrient supplies. this study, understand contributions ZCU KI supplies, concentrations, ECS as well their variations, physical‐biochemical coupled model was applied. According results observations, years 2013 2018 were identified strong weak during 2010–2018 period, respectively. 2013, chlorophyll‐ concentrations higher than nearshore areas, but lower at bottom wide offshore areas. Strong wind stress induced shoreward net flux along 60‐m isobath, seaward 2018. fewer supplies from spring decreased its influence on obvious that caused ZCU. Phytoplankton areas reflected different mechanisms conclusion, intensity ZCU, rather KI, principal factor influencing primary productivity
Language: Английский
Citations
14
Journal of Geophysical Research Biogeosciences, Journal Year: 2023, Volume and Issue: 128(3)
Published: March 1, 2023
Abstract The western boundary currents are characterized by abundant diazotrophs including Trichodesmium , which may fuel N 2 fixation when they intrude into marginal seas. Kuroshio, a current in the North Pacific, flows East China Sea (ECS) and southern Yellow (SYS), transports diatom‐diazotroph associations (DDAs). Additionally, low nitrogen:phosphorus (N:P) ratio relatively dissolved iron have been observed offshore ECS because of Kuroshio intrusion as well riverine/atmospheric inputs P iron. We hypothesized that greatly enhanced SYS. rates (NFRs) were measured using 15 bubble method during summer 2013. surface depth‐integrated NFRs SYS 1.45 nmol L −1 d 81.7 μmol m −2 on average, respectively, with highest values 13.84 511.8 . found significantly higher oceanic (Kuroshio water) mesohaline regions (Kuroshio‐affected than low‐salinity coastal upwelling regions. NFR was positively correlated densities DDAs, salinity, temperature but negatively NO 3 − N:P ratio. Generalized additive models confirmed spatial variation overwhelmingly contributed density. These findings suggested through promoting growth filamentous providing appropriate nutrient environment.
Language: Английский
Citations
13
Sedimentary Geology, Journal Year: 2019, Volume and Issue: 384, P. 50 - 59
Published: March 11, 2019
Language: Английский
Citations
41
Environmental Pollution, Journal Year: 2019, Volume and Issue: 259, P. 113802 - 113802
Published: Dec. 13, 2019
Language: Английский
Citations
38
Journal of Geophysical Research Biogeosciences, Journal Year: 2022, Volume and Issue: 127(2)
Published: Jan. 27, 2022
Abstract Sediment oxygen consumption (SOC) is important in modulating the budget East China Sea where seasonal hypoxia occurs. Porewater advection, molecular diffusion and bioturbation supply for sedimentary organic matter degradation. A pelagic‐benthic coupled model was applied to quantify SOC. comparison with observations showed good performance reproducing hydrographic ecological environments, particularly interannual variation hypoxic zone. Simulation results show that porewater‐advection‐induced flux predominant component of SOC sandy areas on Changjiang bank outer shelves, while bioturbation‐induced at mud depocenters. By comparing water (WOC) below pycnocline, contribution generally ∼40% The spatial distribution summer relatively steady from year year, high WOC patches explain more about rather than drives hypoxia. Particularly bank, milder hydrodynamics are favorable both higher benthic but substantially suppress porewater advective flux, which net lower This finding may shed light other coupling processes coastal shelf seas occurs permeable sediments.
Language: Английский
Citations
22
Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 10
Published: Jan. 27, 2023
Flood events significantly increase water discharges and terrigenous material inputs to coastal waters. Riverine nutrients in the Changjiang Estuary are transported by dispersion of Diluted Water (CDW) plumes detached low-salinity patches. However, effects flooding on nutrient offshore transports have not been well explored. Here, we present conditions adjacent East China Sea historical year 2020. Comparisons distributions between years, drought non-flooding years were also made. Our results showed that nitrate flux from River August 2020 was 1.5 times multi-year averaged years. Enormous riverine input resulted much higher concentrations outer estuary than those In addition, a patch observed, which made salinity northern even lower 1998. Surface dissolved inorganic (DIN) level ~16 at nearby station 2006. While phosphate (PO 4 3− ) less 0.1 μmol L −1 east 123°E, probably caused intensive biological uptake, as indicated high Chlorophyll (Chl concentration (29.08 μg ). The depleted PO N/P suggested limitation under flood conditions. A three end-member mixing model adopted identify contributions CDW (CDW process distributions. contribution (122–124°E, 31–32.5°N) over double Model-derived DIN uptake 24.65 patch. Accordingly, estimated net community production 566–1131 mg C m −2 d within euphotic zone. transport low-salinity, high-DIN during could significant influence biogeochemical cycles broad shelf, Japan Sea.
Language: Английский
Citations
11
Journal of Geophysical Research Oceans, Journal Year: 2024, Volume and Issue: 129(2)
Published: Feb. 1, 2024
Abstract Cross‐shelf penetrating fronts (CPFs) induce significant cross‐shelf exchange of water properties and nutrients, thus are important to coastal environments. In this study, the characteristics mechanisms realistic large‐scale CPFs in East China Sea summer were investigated based on a data assimilative model. The model reproduced matched well with satellite observations. Although currents predominantly offshore off Zhe‐Min Coast, only three strong occurred 2014. three‐dimensional structure CPF was similar that observed previous research. Two different responsible for formation CPFs. formed as result convergence Taiwan Warm Current (TWC) Coastal (ZMCC), while other one caused by undulation thermocline. Heat budget analysis suggests thermocline horizontal vertical advection. Sensitivity experiments suggest southerly wind relaxation tidal forcing indispensable conditions formation. Tidal makes axis ZMCC shift ∼50 km, so could impinge right against TWC. winds allows extend southward. Southerly is mostly associated tropical cyclones. Without synoptic variation TWC, form periodically due strengthening during neap tide period.
Language: Английский
Citations
4
Environmental Research, Journal Year: 2025, Volume and Issue: 271, P. 121069 - 121069
Published: Feb. 7, 2025
Language: Английский
Citations
0