Journal
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
Volume 125, Issue 10, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020JG005727
Keywords
Changjiang Estuary; oceanic and riverine nutrients; physical‐ biological model; summer chlorophyll
Funding
- National Key Research, Development Program of China [2016YFC1401601, 2017YFC1404000, 2017YFA0604102]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA19060203, XDB42000000, XDA19060202]
- National Natural Science Foundation of China (NSFC) [41876019]
- Foundation for Innovative Research Groups of NSFC [41421005]
- NSFC-Shandong Joint Fund for Marine Science Research Centers [U1406401, U1806227]
- National Key research and development Plan Sino-Australian Center for Healthy Coasts [2016YFE0101500]
- CAS-CSIRO BAU project [133137KYSB20180141]
- Aoshan Sci-Tec Innovative Project of Qingdao National Laboratory for Marine Science and Technology [2016ASKJ02]
- High Performance Computing Center at the IOCAS
- East China Sea ocean observation and research station of OMORN
- Youth Innovation Promotion Association CAS
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The Changjiang Estuary and adjacent sea area in the East China Sea suffer from frequent harmful algal blooms. However, the relative importance of riverine nutrient input from the Changjiang River and oceanic nutrient input from the Taiwan Warm Current and Kuroshio Current to the development and distribution of summer phytoplankton blooms in this area remains unclear. To address this problem, we deployed a coupled physical-biological model. The coupled model successfully reproduces the main hydrographic and biogeochemical features in this domain. Both satellite observations and model results show two regions of elevated chlorophyll concentrated in this site. Simulated results show that harmful algal blooms in the region north of the Zhoushan Islands are mainly driven by riverine nutrients from the Changjiang River, while algal blooms in the region south of the Zhoushan Islands are mainly controlled by nutrients from the open ocean. Nutrient input, particularly phosphate, from the Kuroshio subsurface water contributes most to the accumulation of dinoflagellate biomass and chlorophyll in the southern region, while the Taiwan Warm Current has less influence. This has implications for nutrient control and land management practices: Although reducing riverine nutrient loads may significantly reduce phytoplankton growth north of the Zhoushan Islands, it will have little effect in the area to the south.
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