Study on the concentration variation of CO<sub>2</sub> in the background area of Xisha

Lv Honggang; Wang Haiyan; Jiang Yifei; Cheng Hainan; Qiao Ran; Wang Zhanggui

doi:10.3969/j.issn.0253-4193.2015.06.003

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Lv Honggang, Wang Haiyan, Jiang Yifei, Cheng Hainan, Qiao Ran, Wang Zhanggui. Study on the concentration variation of CO2 in the background area of Xisha[J]. Haiyang Xuebao, 2015, 37(6): 21-30. doi: 10.3969/j.issn.0253-4193.2015.06.003

Citation:

Lv Honggang, Wang Haiyan, Jiang Yifei, Cheng Hainan, Qiao Ran, Wang Zhanggui. Study on the concentration variation of CO₂ in the background area of Xisha[J]. Haiyang Xuebao, 2015, 37(6): 21-30. doi: 10.3969/j.issn.0253-4193.2015.06.003

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Study on the concentration variation of CO₂ in the background area of Xisha

doi: 10.3969/j.issn.0253-4193.2015.06.003

1.
National Marine Environmental Forecasting Center, Beijing 100081, China;Key Laboratory of Research on Marine Hazards Forecasting, National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing 100081, China
2.
National Marine Environmental Forecasting Center, Beijing 100081, China
3.
Sansha Ocean Environmental Monitoring Center Station, Haikou 570311, China

Received Date: 2014-12-10

Abstract

Abstract

CO₂ is the most important greenhouse gases that cause global warming. After the sea absorb excess CO₂, the composition of carbonate system changes. Consequently, the pH of the seawater will reduce and damage the marine ecological environment. The atmospheric carbon dioxide (CO₂) was observed at Xisha in the South China Sea from December 2013 to November 2014. A mathematical procedure based on robust local regression was applied to distinguish background and non-background concentration. The CO₂ background concentration shows large diurnal and seasonal variations. The CO₂ concentration shows lower during daytime and higher during nighttime in four seasons. The maximum is 405.39×10^-6 (V/V) and minimum is 399.12×10^-6(V/V). The CO₂ seasonal cycle shows higher in spring and winter, lower in summer and autumn. The monthly maximum appears in November 2013 (i.e., 406.22×10^-6 (V/V)) and the minimum appears in September 2014 . The diurnal variation of background concentration is mainly affected by sunlight and temperature in the region. And the seasonal variation is controlled by monsoon, atmospheric circulation, photosynthesis, and source or sink of the sea to air.
- Xisha,
- South China Sea,
- atmospheric CO₂,
- the background concentration

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References(30)

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