The impact of river discharge and wind on the hypoxia off the Changjiang Estuary: A numerical modeling study

Zheng Jingjing; Liu Guimei; Gao Shan; Li Yun; Li Zhijie

doi:10.3969/j.issn.0253-4193.2018.09.001

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Zheng Jingjing, Liu Guimei, Gao Shan, Li Yun, Li Zhijie. The impact of river discharge and wind on the hypoxia off the Changjiang Estuary: A numerical modeling study[J]. Haiyang Xuebao, 2018, 40(9): 1-17. doi: 10.3969/j.issn.0253-4193.2018.09.001

Citation:

Zheng Jingjing, Liu Guimei, Gao Shan, Li Yun, Li Zhijie. The impact of river discharge and wind on the hypoxia off the Changjiang Estuary: A numerical modeling study[J]. Haiyang Xuebao, 2018, 40(9): 1-17. doi: 10.3969/j.issn.0253-4193.2018.09.001

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The impact of river discharge and wind on the hypoxia off the Changjiang Estuary: A numerical modeling study

doi: 10.3969/j.issn.0253-4193.2018.09.001

National Marine Environmental Forecasting Center, Beijing 100081, China;Key Laboratory of Research on Marine Hazards Forecasting, National Marine Environmental Forecasting Center, Beijing 100081, China

Received Date: 2017-06-08
Rev Recd Date: 2018-05-25

Abstract

Abstract

By the natural and human activities, the phenomenon of marine hypoxia has become increasingly serious, threatening the marine ecological environment. And the problem of marine hypoxia has caused wide attention. In this paper, a three-dimensional hydrodynamic model (ROMS) was coupled to a biogeochemical model to simulate and analyze the ecological system of the East China Sea. In comparison with the observation data, the model results can reasonably capture the physical and biochemical dynamics off the Changjiang River Estuary. In addition, the sensitive experiments were also used to examine the role that physical forcing (river discharge, wind speed, wind direction) play in controlling hypoxia in waters adjacent to the Changjiang River Estuary. The results show that the wind and river discharge have significant influences on the hypoxia off the Changjiang River Estuary. The seasonal cycle of hypoxia was relatively insensitive to synoptic variability in river discharge, but integrated hypoxic areas were sensitive to the overall magnitude of river discharge. Increased in the magnitude of river discharge led to enhance stratification and surface chlorophyll concentration, thereby greatly increased hypoxic area off the Changjiang River Estuary. In contrast, decreased in the magnitude of river discharge reduced the stratification and surface chlorophyll concentration and hence significantly decreased the hypoxic area. And variations in wind speed and direction had the greatest impact on the seasonal cycle of hypoxia and large impacts on the annually integrated hypoxic areas.
- Changjiang River Estuary,
- wind,
- river discharge,
- hypoxia

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References(37)

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