Journal of Marine Sciences ›› 2018, Vol. 36 ›› Issue (2): 1-11.DOI: 10.3969/j.issn.1001-909X.2018.02.001

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Satellite remote sensing retrieval of aquatic pCO2 in summer in the Pearl River Estuary

LÜ Hang-yu1, BAI Yan*2,3, LI Qian4,5, JIANG Hong1   

  1. 1. International Institute for Earth System Science, Nanjing University, Nanjing 210000, China;
    2. State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;
    3. Second Institute of Oceanography, SOA, Hangzhou 310012 , China;
    4. State Key Laboratory of Marine Environmental Science, Xiamen 361000, China;
    5. Xiamen University, Xiamen 361000, China
  • Received:2018-02-12 Revised:2018-05-02 Online:2018-06-15 Published:2022-11-21

Abstract: Based on the method of the controlling factors analyses, a satellite remote sensing algorithm was developed to retrieve the aquatic pCO2 in the Pearl River Estuary in summer time. The end members of the Pearl River water and Kuroshio water were applied to quantify the pCO2 variations controlled by the water mass mixing and thermal dynamic effects, and a look-up table was generated to fulfill the calculation. Moreover, relationship between the aCDM(443 nm) and surface layer water salinity was established to retrieve the salinity from ocean color satellite data. In addition, based on the underway measured pCO2 and matchup satellite Chl-a data, the model for the biological effect on the pCO2 was developed. Finally, the mixing and biological effects on the pCO2 were combined to retrieve the pCO2 from the satellite. Based on the established model, the comparisons between the retrieved pCO2 and underway measured pCO2 were carried out. The results show that if only considering the mixing and thermal dynamic effects it would overestimate the pCO2, while if considering the biological effect additionally it would much improve the results not only on the magnitudes, but also the variations. The satellite-retrieved pCO2 also reveals that in summer time, the coastal region in the Pearl River Estuary is a sink of the atmosphere CO2, while the outer shelf is a weak source of CO2.

Key words: Pearl River Estuary, aquatic pCO2, remote sensing retrieval

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