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学科主题: Oceanography
题名: Physical-biological coupling in the Pearl River Estuary
作者: Harrison, PJ ; Yin, KD ; Lee, JHW ; Gan, JP ; Liu, HB
通讯作者: harrison@ust.hk
关键词: Pearl River Estuary ; phosphorus limitation ; chlorophyll ; eutrophication ; algal blooms ; sewage
刊名: CONTINENTAL SHELF RESEARCH
发表日期: 2008
卷: 28, 期:12, 页:1405-1415
收录类别: sci
部门归属: [Harrison, Paul J.; Yin, Kedong; Gan, Jianping; Liu, Hongbin] Hong Kong Univ Sci & Technol, AMCE Program, Hong Kong, Hong Kong, Peoples R China; [Liu, Hongbin] Hong Kong Univ Sci & Technol, Dept Biol, Hong Kong, Hong Kong, Peoples R China; [Gan, Jianping] Hong Kong Univ Sci & Technol, Dept Math, Hong Kong, Hong Kong, Peoples R China; [Lee, J. H. W.] Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China; [Yin, Kedong] Griffith Univ, Australian Rivers Inst, Brisbane, Qld 4111, Australia; [Yin, Kedong] CAS, S China Sea Inst Oceanol, LED, Guangzhou, Guangdong, Peoples R China
项目归属: LED
摘要: The Pearl River Estuary is a subtropical estuary and the second largest in China based on discharge volume from the Pearl River. Processes in the estuary vary spatially and temporally (wet vs dry season). In the dry season at the head of the estuary, hypoxic and nearly anoxic conditions occur and NH4 reaches > 600 mu M, NO3 is similar to 300 mu M and nitrite is similar to 60 mu M indicating that nitrification and denitrification may be important dry season processes in the region extending 40 km upstream of the Humen outlet. There are very few biological studies conducted in this upper section of the estuary in either the dry or wet seasons and hence there is a need for further research in this region of the river. In the wet season, the salinity wedge extends to the Hongqimen outlet and oxygen is low (35-80% saturation). Nitrate is similar to 100 mu M, silicate similar to 140 mu M: and phosphate is relatively low at similar to 0.5 mu M, yielding an N:P ratio up to similar to 200:1 in summer. Nutrients decrease in the lower estuary and primary productivity may become potentially P-limited. Eutrophication is not as severe as one would expect from the nutrient inputs from the Pearl River and from Hong Kong's sewage discharge. This estuary shows a remarkable capacity to cope with excessive nutrients. Physical processes such as river discharge, tidal flushing, turbulent dispersion, wind-induced mixing, and estuarine circulation play an important role in controlling the production and accumulation of algal blooms and the potential occurrence of hypoxia. Superimposed on the physical processes of the estuary are the chemical and biological processes involved in the production of the bloom. For example, the 100N:1P ratio indicates that P potentially limits the amount of algal biomass (and potential biological oxygen demand) in summer. While extended periods of hypoxia are rare in Hong Kong waters, episodic events have been reported to occur during late summer due to factors such as low wind, high rainfall and river discharge which result in strong density stratification that significantly dampens vertical mixing processes. Nutrient loads are likely to change over the next several decades and monitoring programs are essential to detect the response of the ecosystem due to the future changes in nutrient loading and the ratio of nutrients. (c) 2008 Elsevier Ltd. All rights reserved.
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WOS记录号: WOS:000257620200002
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5989
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Harrison, PJ; Yin, KD; Lee, JHW; Gan, JP; Liu, HB.Physical-biological coupling in the Pearl River Estuary,CONTINENTAL SHELF RESEARCH,2008,28(12):1405-1415
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