Abstract. A three dimensional coupled biophysical model was used to examine the supply of oceanic nutrients shelf East China Sea (ECS) and its role in primary production over shelf. The consisted two parts: hydrodynamic module based on a nested with horizontal resolution 1/18 degree, whereas biological lower trophic level ecosystem including types phytoplankton, elements nutrients, biogenic organic material. results suggested that seasonal variations occurred distribution chlorophyll ECS....

Increasing attention has recently been drawn to oxygen depletion and ocean acidification in coastal seas their impacts on the marine ecosystem. Intensive organic matter degradation combined with weak water exchange is considered be mainly responsible for bottom acidification. Hypoxia of Bohai Sea have frequently observed summer seasons over past decade. In this study, monthly surveys were conducted along an inshore-offshore transect north from May August 2017 2018. The physical structure...

Abstract Several methods have been developed for the estimation of turbulent Reynolds stress in wavy aquatic environment. They are based on different physical assumptions and often give discrepant results. It is practically difficult to quantify uncertainties these estimations. Using high‐resolution velocity measurements acoustic Doppler velocimeter (ADV) from a coastal benthic layer subject moderate wave influence (the ratio rms orbital current magnitude was 0.23–0.92), this study tests...

Abstract Onshore and offshore currents the associated volume transport across three isobaths (50, 100, 200 m) over continental shelf of East China Sea were examined using daily reanalysis data in 1993–2012. After being averaged along isobaths, velocities 100 50 m are onshore bottom layer but surface layer. In contrast, those 200-m isobath layers without a clear direction midlayer, suggesting three-layer structure. The current 100-m mainly arises from Taiwan Strait Current, while Kuroshio,...

Abstract Nitrogen biogeochemistry during the beginning of a spring phytoplankton bloom in Yellow Sea was investigated based on nutrient concentrations, benthic fluxes nutrients, nitrogen and oxygen isotope composition NO 3 − , hydrological conditions. The δ 15 N 18 O values for were more variable surface waters than near‐bottom generally 6.3–8.2‰ 6.2–9.7‰ O, except Coastal Current Water (YSCCW), where maximum found 13.2‰ 18.8‰, respectively. Both varied among different water masses with...

ABSTRACT Understanding the adaptation of archaea to hypoxia is essential for deciphering functions and mechanisms microbes when suffering environmental changes. However, dynamics responses sedimentary in Bohai Sea are still unclear. In this study, diversity, composition, distribution archaeal community sediment along an inshore–offshore transect across oxygen‐depleted area were investigated June, July, August 2021 by employing high‐throughput sequencing 16S rRNA gene. Results indicated that...

Deoxygenation in coastal seas has significant implications to the marine ecosystems. In this study, processes influencing seasonal variation of dissolved oxygen (DO) Bohai and Yellow Seas (BS YS) are investigated using a coupled physical-biogeochemical model. The DO concentration ([DO]) surface water is lower summer autumn higher winter spring, which mainly controlled by temperature. Moreover, layer, photosynthesis, some extent, regulates [DO] leads supersaturation summer, whereas downward...

Abstract In the deep central part of Bohai Sea off coast northern China, long-term observations show significantly lower dissolved oxygen (DO) concentration near bottom in summer during 2006–2018 than 1978–2005. The decrease DO is closely linked to changes phytoplankton community driven by nutrient structure water column. From literature review, indicate an increase abundant proportion dinoflagellate diatom and miniaturization since 21st century. new dominate species dinoflagel-late pico-...

In recent years, the issue of air pollution has garnered significant public attention globally, with a particular emphasis on challenge atmospheric fine particulate matter (PM2.5) pollution. The efficient and precise simulation changes in pollutant concentrations, as well their spatial temporal distribution, is essential for effectively addressing issue. this paper, WRF-Chem model used to simulate meteorological elements including temperature (T), relative humidity (RH), wind speed (WS),...

Abstract Molybdenum carbide (Mo 2 C), known for its platinum‐like electronic structure and excellent corrosion resistance, has demonstrated promising catalytic performance in laboratory tests. However, under industrial harsh conditions, the of Mo C faces constraints due to inherently strong hydrogen adsorption. Additionally, at elevated current densities, rapid depletion active species electrolyte, coupled with gas bubble accumulation, introduce significant mass transport challenges. This...

Abstract High‐frequency measurements of waves, currents, and turbulence were made using the bottom‐mounted tripod equipped with Nortek 6‐MHz acoustic Doppler velocimetry at eight mooring stations in East China Shelf Seas. The observational data are analyzed to estimate bottom drag coefficient also contributions from currents waves. Variations caused by show no obvious relationship water depth. Generally, current‐induced decreases strengthening wave‐induced increases enhancing Synthesis...