Space–Time Variations in the Long-Range Dependence of Sea Surface Chlorophyll in the East China Sea and the South China Sea DOI Creative Commons
Junyu He, Ming Li

Fractal and Fractional, Journal Year: 2024, Volume and Issue: 8(2), P. 102 - 102

Published: Feb. 7, 2024

Gaining insights into the space–time variations in long-range dependence of sea surface chlorophyll is crucial for early detection environmental issues oceans. To this end, 12 locations were selected along Yangtze River and Pearl estuaries, varying distances from Chinese coastline. Daily satellite-observed concentration data at these collected Copernicus Marine Service website, spanning December 1997 to November 2023. The main objective current study introduce a multi-fractional generalized Cauchy model calculating values Hurst exponents quantitatively assessing strength different spatial time instants during period. Furthermore, ANOVA was utilized detect differences calculated exponent among various months seasons. From perspective, findings reveal significantly stronger offshore regions compared nearshore areas, with > 0.5 versus <0.5. It noteworthy that each location exhibit significant seasons, temporal perspective. Specifically, summer region weaker than other whereas concludes inversely related distance coastline, anthropogenic activity plays dominant role shaping coastal China.

Language: Английский

Evolution of harmful algal blooms in the East China Sea under eutrophication and warming scenarios DOI
Zheng‐Xi Zhou, Rencheng Yu,

Mingjiang Zhou

et al.

Water Research, Journal Year: 2022, Volume and Issue: 221, P. 118807 - 118807

Published: July 2, 2022

Language: Английский

Citations

77
Trends in nutrients in the Changjiang River DOI
Wentao Wu, Junjie Wang, Hao Wang

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 872, P. 162268 - 162268

Published: Feb. 16, 2023

Language: Английский

Citations

36
Nutrient characteristics driven by multiple factors in large estuaries during summer: A case study of the Yangtze River Estuary DOI

Lilian Wen,

Jinming Song,

Jiajia Dai

et al.

Marine Pollution Bulletin, Journal Year: 2024, Volume and Issue: 201, P. 116241 - 116241

Published: March 12, 2024

Language: Английский

Citations

9
Nitrogen Utilization Dynamics in a Tropical Estuary: Interplay of Temperature and Phytoplankton Communities DOI
Penglan Shi, Z. Q. Tan, Yuanhai Fu

et al.

Marine Environmental Research, Journal Year: 2025, Volume and Issue: 205, P. 107018 - 107018

Published: Feb. 15, 2025

Language: Английский

Citations

1
Historic changes in nutrient fluxes from the Yangtze River to the sea: Recent response to catchment regulation and potential linkage to maritime red tides DOI
Hongwei Yang, Qing Zhu, Jianan Liu

et al.

Journal of Hydrology, Journal Year: 2022, Volume and Issue: 617, P. 129024 - 129024

Published: Dec. 23, 2022

Language: Английский

Citations

29
Metabarcoding analysis of harmful algal bloom species in the Changjiang Estuary, China DOI

Zongmei Cui,

Qing Xu, Kate Gibson

et al.

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 782, P. 146823 - 146823

Published: March 29, 2021

Language: Английский

Citations

33
Water Oxygen Consumption Rather Than Sediment Oxygen Consumption Drives the Variation of Hypoxia on the East China Sea Shelf DOI
Qicheng Meng, Wenyan Zhang, Feng Zhou

et al.

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
Unraveling seasonal and interannual nutrient variability shows exceptionally high human impact in eutrophic coastal waters DOI
Long Jiang, Xinyu Lu, Guifen Wang

et al.

Limnology and Oceanography, Journal Year: 2023, Volume and Issue: 68(5), P. 1161 - 1171

Published: March 12, 2023

Abstract Nutrient import into eutrophic estuarine‐coastal zones is modulated by river discharge and anthropogenic activities (agriculture, industry, sewage, etc.). Comparing vs. hydrological influences on nutrient loading important for ecosystem managers but has been a long‐standing challenge. As an attempt to fill this gap, retrospective study was conducted using multiyear (2012–2022) data in one of the most coastal seas China, Jiangsu waters. Of two main pollutants coast, dissolved inorganic nitrogen (DIN) extremely overloaded relative phosphate (PO 4 ). Their spatial distribution shows clear terrestrial sources as concentrations decrease offshore. Although each survey DIN PO are enriched low‐salinity waters, their spatially averaged out phase with seasonal interannual scales. A box model applied decompose contributions activities. Results show that human impacts variability exceed those factors coast. Anthropogenic decreases during 2012–2020, paralleled reduced fertilizer use other nonpoint sources. Sporadic fluxes from point likely responsible aseasonal nutrient‐rich patches. Our demonstrates water quality waters highly affected Findings have broad implications local monitoring strategies restoration efforts provide insight assessing stress field global ecosystems.

Language: Английский

Citations

12
Recent Declines in Nutrient Concentrations and Fluxes in the Lower Changjiang River DOI Open Access
Yao Wang, Lei Gao,

Yue Ming

et al.

Estuaries and Coasts, Journal Year: 2023, Volume and Issue: 46(6), P. 1475 - 1493

Published: May 18, 2023

Language: Английский

Citations

12
Rapid variations of phytoplankton blooms and their dynamics off the Changjiang River Estuary DOI Creative Commons

Miaomiao Xu,

Yihe Wang, Zhixuan Feng

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Feb. 9, 2024

Phytoplankton frequently blooms in estuaries and coastal seas. Numerous dynamic processes affect these regions, generating complex hydrodynamics that induce intense phytoplankton variability over multiple time scales. Especially, the scales of 10 0 -10 1 days (event-scale) is a strong signal fundamental to aquatic environments ecosystems. Based on historical monitoring harmful algal bloom events fully coupled hydrodynamics-sediment-ecosystem numerical model, this study explored horizontal distribution patterns maximum off Changjiang River Estuary Our results showed typically lasted less than week chlorophyll varied scale days. Tidal forcing was shown dominate periodic variability. The variations river runoff wind also modulated added more disturbances. Increased enhanced summer monsoon caused physically extend further offshore, while they biologically stimulated blooms. analysis regulation responds faster physical effects biological ones. At same time, during neap tides, adjustment disturbances associated with hydrodynamic stably salient. Such based adaptation light availability nutrient supply. This contributes understanding affected by physical-biological benefits management environmental conservation.

Language: Английский

Citations

4