Hydrodynamics Mediates Biogeochemical Dynamics of Particulate Organic Matter in the Shelf of the Northern South China Sea During Summer

Environmental conditions, physiology and community composition of phytoplankton and the carbon and nitrogen isotope signature (δ13CPOC and δ15NPN) of particulate organic matter (POM) often covary across marine environments. However, little was known on the link of δ13CPOC and δ15NPN and the communit...

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Bibliographic Details
Published in:Journal of geophysical research. Oceans 2024-10, Vol.129 (10), p.n/a
Main Authors: Jiang, Zhiqin, Shi, Zhen, Chen, Dawei, Li, Xiangfu, Li, Ruihuan, Xu, Jie
Format: Article
Language:English
Subjects:
Abundance
anticyclonic eddy
Biochemical composition
Biochemistry
Biogeochemical cycle
Biogeochemical cycles
Biogeochemistry
Biomass
Carbon
chlorophyll
Chlorophyll a
Community composition
community structure
Composition
Cyanobacteria
Diatoms
Dynamics
Environmental conditions
Environmental gradient
Fluid mechanics
geophysics
Hydrodynamics
isotopes
Marginal seas
Marine environment
Marine microorganisms
Nitrogen
Nitrogen isotopes
Nutrient availability
Nutrient dynamics
Nutrients
Ocean circulation
Organic carbon
Organic matter
Particulate organic carbon
Particulate organic matter
physiology
Phytoplankton
phytoplankton community
Plankton
riparian areas
river plume
River plumes
Rivers
Salinity
Salinity effects
Shelving
South China Sea
Spatial variability
Spatial variations
Stable isotopes
stable isotopes of carbon and nitrogen
Summer
the Pearl River Dilution Water
Trichodesmium
Upwelling
Variability
Vortices
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Summary:Environmental conditions, physiology and community composition of phytoplankton and the carbon and nitrogen isotope signature (δ13CPOC and δ15NPN) of particulate organic matter (POM) often covary across marine environments. However, little was known on the link of δ13CPOC and δ15NPN and the community and biochemical composition of phytoplankton. In this study, particulate organic carbon (POC) and nitrogen (PN), δ13CPOC, δ15NPN, phytoplankton community composition and biomass were determined during summer, along with environmental variables, in the shelf of the northern South China Sea influenced by the Pearl River plume, upwelling and anticyclonic eddy. Our results show that variability in δ13CPOC and δ15NPN along an environmental gradient is coupled with shifts in phytoplankton community composition and carbon to chlorophyll a (C:Chl a) ratio of phytoplankton. Low δ13CPOC values (−28.4 to −27.0‰) at nearshore stations (salinity −21.0‰) and δ15NPN (>5.6‰) values are most likely attributed to high abundance of diatoms induced by riverine nutrients in the plume‐impacted waters with intermediate salinity (21< salinity
ISSN:2169-9275
2169-9291
DOI:10.1029/2024JC021101