Journal of Marine Sciences ›› 2023, Vol. 41 ›› Issue (3): 14-21.DOI: 10.3969/j.issn.1001-909X.2023.03.002

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Variations of pCO2 and sea-air CO2 flux in Qingdao coastal seawater in spring based on buoy observations

ZHOU Xuehang1(), ZHANG Honghai2, MA Xin1,3, CHEN Zhaohui1,3,*()   

  1. 1. Key Laboratory of Physical Oceanography, MOE, Ocean University of China, Qingdao 266100, China
    2. Key Laboratory of Marine Chemistry Theory and Technology, MOE, Ocean University of China, Qingdao 266100, China
    3. Laoshan Laboratory, Qingdao 266237, China
  • Received:2023-01-19 Revised:2023-03-22 Online:2023-09-15 Published:2023-10-24


Based on the high frequency data of sea-air interface buoys, the variation pattern and driving factors of sea-air partial pressure of carbon dioxide (pCO2) were analyzed and the sea-air CO2 flux in the coastal waters of Qingdao in spring was estimated. During the observation period, the sea area changed from a carbon sink of atmospheric CO2 to a carbon source, which was mainly caused by the continuous increase of sea surface pCO2. By analyzing the controlling factors of pCO2, it was found that temperature was the main driving factor of pCO2 growth, and biological processes played a certain inhibiting role. The sea surface pCO2 showed a diurnal variation. The effects of temperature and biological factors on the diurnal variation of pCO2 were related to solar radiation, but they had opposite effects. In addition, the analysis showed that different sampling frequencies of buoys affected the estimation of sea-air CO2 flux and shortening the sampling interval could effectively reduce the deviation of CO2 flux estimation and improve the accuracy of estimation.

Key words: pCO2, sea-air flux of CO2, buoy observation, Qingdao coastal waters

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