Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary

Xuelu Gao; Jinming Song; Ning Li; Xuegang Li

doi:10.1007/s00343-007-0254-y

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Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary

Updated：2023-05-16

- Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary
- Journal of Oceanology and Limnology Vol. 25, Issue 3, Pages: 254-260(2007)
- Affiliations：
  
  1. Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences
  2. Key Laboratory of Tropical Marine Environmental Dynamics South China Sea Institute of Oceanology Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-007-0254-y
  CLC：
- Published：2007
- Accepted：
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Gao, X., Song, J., Li, N. et al. Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary., Chin. J. Ocean. Limnol. 25, 254–260 (2007). https://doi.org/10.1007/s00343-007-0254-y
DOI：

Gao, X., Song, J., Li, N. et al. Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary., Chin. J. Ocean. Limnol. 25, 254–260 (2007). https://doi.org/10.1007/s00343-007-0254-y DOI：

摘要

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.

关键词

Keywords

references

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