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

Previous Articles     Next Articles

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

MIAO Yanyi1,3, WANG Bin*1,3, LI Dewang1,3, JIN Haiyan1,2,3, JIANG Zhibin1,3, MA Xiao2,3, YU Peisong1,3, CHEN Jianfang*1,2,3, WANG Junyang1,3   

  1. 1. Key Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, China;
    2. State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;
    3. Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
  • Received:2019-05-09 Online:2020-03-15 Published:2022-11-14

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

CLC Number: