| Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang （Yangtze） River Estuary |
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| 引用本文： | 高学鲁,宋金明,李宁,李学刚.Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang （Yangtze） River Estuary[J].中国海洋与湖沼学报,2007,25(3):254-260. |
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| 作者姓名： | 高学鲁 宋金明 李宁 李学刚 |
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| 作者单位： | [1]Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China [2]Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| 基金项目： | 国家重点基础研究发展计划(973计划);山东省青岛市科技发展基金;中国科学院"百人计划" |
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| 摘 要： | A field observation was carried out in the Changjiang （Yangtze） River Estuary from May 19 to 26, 2003. A total of 29 stations, including 2 anchored stations, were occupied through almost the whole salinity gradient. Based on the observation data, biogeochemistry of chemical oxygen demand （COD） was examined. Spatial distribution pattern of COD shows that it decreased downstream. The COD concentration varied generally within a narrow range of 1.24-1.60 mg/L in the zone around the river mouth, beyond which it decreased rapidly to 0.20 mg/L. In the mixed water zone, the fluctuation in COD was smaller at 2 m above the bottom layer than at the surface layer in 48 h. In the seawater zone, the 48-h fluctuation at the surface was the largest, followed by that of 5 m below the surface and 2 m above the bottom layers in a range of from 2.50 to 0.55 mg/L. Freshwater discharge was the dominant source of COD in the estuary. The average COD beyond the river mouth was 2.7 mg/L, which accorded with the Chinese seawater quality Grade I. Relationships between dissolved oxygen and biogeochemical parameters such as suspended particulate matter, dissolved organic matter and chlorophyll-a were also discussed.
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| 关 键 词： | 空间分布 化学 氧化需求 雨季 长江 |
| 收稿时间： | 30 April 2006 |
| 修稿时间： | 2006-04-302006-06-08 |
Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary |
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| Gao?Xuelu,Song?Jinming,Li?Ning,Li?Xuegang.Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary[J].Chinese Journal of Oceanology and Limnology,2007,25(3):254-260. |
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| Authors: | Gao Xuelu Song Jinming Li Ning Li Xuegang |
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| Institution: | 1. Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | A field observation was carried out in the Changjiang (Yangtze) River Estuary from May 19 to 26, 2003. A total of 29 stations,
including 2 anchored stations, were occupied through almost the whole salinity gradient. Based on the observation data, biogeochemistry
of chemical oxygen demand (COD) was examined. Spatial distribution pattern of COD shows that it decreased downstream. The
COD concentration varied generally within a narrow range of 1.24–1.60 mg/L in the zone around the river mouth, beyond which
it decreased rapidly to 0.20 mg/L. In the mixed water zone, the fluctuation in COD was smaller at 2 m above the bottom layer
than at the surface layer in 48 h. In the seawater zone, the 48-h fluctuation at the surface was the largest, followed by
that of 5 m below the surface and 2 m above the bottom layers in a range of from 2.50 to 0.55 mg/L. Freshwater discharge was
the dominant source of COD in the estuary. The average COD beyond the river mouth was 2.7 mg/L, which accorded with the Chinese
seawater quality Grade I. Relationships between dissolved oxygen and biogeochemical parameters such as suspended particulate
matter, dissolved organic matter and chlorophyll-a were also discussed.
Supported by National Basic Research Program of China 973 plan (2007CB407305), the Qingdao Special Program for Leading Scientists
(05-2-JC-90), the “100 Talents Project” of the Chinese Academy of Sciences |
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| Keywords: | spatial distribution diurnal variation chemical oxygen demand the Changjiang (Yangtze) River Estuary |
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