The effect of strong wind on air-sea CO2 flux in the Changjiang River Estuary and its adjacent sea areas

MIAO Yanyi; WANG Bin; LI Dewang; JIN Haiyan; JIANG Zhibin; MA Xiao; YU Peisong; CHEN Jianfang; WANG Junyang

doi:10.3969/j.issn.1001-909X.2020.01.005

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Journal of Marine Sciences ›› 2020, Vol. 38 ›› Issue (1) : 42-49. DOI: 10.3969/j.issn.1001-909X.2020.01.005

The effect of strong wind on air-sea CO₂ flux in the Changjiang River Estuary and its adjacent sea areas

MIAO Yanyi^1,3, WANG Bin^*1,3, LI Dewang^1,3, JIN Haiyan^1,2,3, JIANG Zhibin^1,3, MA Xiao^2,3, YU Peisong^1,3, CHEN Jianfang^*1,2,3, WANG Junyang^1,3

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Abstract

Underway sea surface pCO₂, sea surface temperature, sea surface salinity data, and discrete DO data in the East China Sea were obtained from August 23, 2017 to September 6, 2017. The distributions of pCO₂ in the Changjiang River Estuary and the adjacent sea areas were examined. Meanwhile, the effect of strong wind on air-sea CO₂ flux in this area was discussed based on data of a revisited section before and after a strong wind event. The results show that sea surface pCO₂ (145~929 μatm) in the study area was higher in the nearshore and lower in the offshore area. Biological production consumed dissolved inorganic carbon, and lowered sea surface pCO₂ of the Changjiang plume waters, which acted as carbon sink. The wind event (the maximum wind speed was 9.7 m·s^－1) triggered vertical mixing, enhanced carbon source significantly at nearshore area(from 0.2±1.9 to 55.0±12.4 mmol·m^－2·d^－1). While, the estimated CO₂ sink at offshore waters was stronger than that before the wind (from -12.7±2.3 to -16.8±2.5 mmol·m^－2·d^－1). Therefore, large bias in air-sea CO₂ flux estimation will be introduced if the influence of typhoon and cold-air events are not considered.

Key words

the Changjiang River Estuary / air-sea CO₂ flux / wind mixing

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MIAO Yanyi, WANG Bin, LI Dewang, JIN Haiyan, JIANG Zhibin, MA Xiao, YU Peisong, CHEN Jianfang, WANG Junyang. The effect of strong wind on air-sea CO₂ flux in the Changjiang River Estuary and its adjacent sea areas[J]. Journal of Marine Sciences. 2020, 38(1): 42-49 https://doi.org/10.3969/j.issn.1001-909X.2020.01.005

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