期刊
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
卷 16, 期 12, 页码 2559-2576出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/nhess-16-2559-2016
关键词
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资金
- National Natural Science Foundation of China [41222038, 41076011, 41206023]
- National Basic Research Program of China (g973h Program) [2011CB403606]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA1102010403]
- National Key Research and Development Program of China [2016YFC1401605]
The phenomenon of low dissolved oxygen (known as hypoxia) in a coastal ocean system is closely related to a combination of anthropogenic and natural factors. Marine hypoxia occurs in the Yangtze Estuary, China, with high frequency and long persistence. It is related primarily to organic and nutrient enrichment influenced by river discharges and physical factors, such as water mixing. In this paper, a three-dimensional hydrodynamic model was coupled to a biological model to simulate and analyze the ecological system of the East China Sea. By comparing with the observation data, the model results can reasonably capture the physical and biochemical dynamics of the Yangtze Estuary. In addition, the sensitive experiments were also used to examine the role of physical forcing (river discharge, wind speed, wind direction) in controlling hypoxia in waters adjacent to the Yangtze Estuary. The results showed that the wind field and river discharge have significant impact on the hypoxia off the Yangtze Estuary. The seasonal cycle of hypoxia was relatively insensitive to synoptic variability in the river discharge, but integrated hypoxic areas were sensitive to the whole magnitude of river discharge. Increasing the river discharge was shown to increase hypoxic areas, while decreasing the river discharge tended to decrease hypoxic areas. The variations of wind speed and direction had a great impact on the integrated hypoxic areas.
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