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<p>Air-sea water vapor and CO<sub>2</sub> flux observation experiments were carried out at the Yantai National Satellite Ocean Calibration Platform and the jetty at Monolithic Beach, Juehua Island, using a 100 Hz gas analyzer. The observations were corrected by employing wild point rejection, linear detrending, delay correction, coordinate rotation, time matching, and Webb, Pearman, and Leuning (WPL) correction. The results of spectral analysis and a turbulence development adequacy data quality check showed that the overall observation data quality was good. The air-sea water vapor and CO<sub>2</sub> flux results showed that the observation duration affected both the air-sea flux intensity and direction at different observation frequencies. At shorter observation durations, the air-sea flux values measured at 100 Hz were smaller than the 20 Hz measurements and had opposite directions. In addition, the WPL correction reduced the overall air-sea flux and partially minimized the effect of observation frequency on the air-sea flux intensity. These results showed that high-frequency observations showed more turbulence variations than low-frequency observations. This conclusion could promote an understanding of small-scale turbulence variations.</p>

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Field observation of air-sea CO2 and H2O flux using the eddy covariance method based on 100 Hz gas analyzer in the Bohai and Yellow Seas

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Tan Yu,
  • Yuhan Xia,
  • Zhengli Qiu,
  • Bangyi Tao,
  • Yan Bai,
  • Xianqiang He,
  • Bing Chen,
  • Mingxing Li,
  • Yu Wang,
  • Qilan Zhang,
  • Chao Liang

摘要

Air-sea water vapor and CO2 flux observation experiments were carried out at the Yantai National Satellite Ocean Calibration Platform and the jetty at Monolithic Beach, Juehua Island, using a 100 Hz gas analyzer. The observations were corrected by employing wild point rejection, linear detrending, delay correction, coordinate rotation, time matching, and Webb, Pearman, and Leuning (WPL) correction. The results of spectral analysis and a turbulence development adequacy data quality check showed that the overall observation data quality was good. The air-sea water vapor and CO2 flux results showed that the observation duration affected both the air-sea flux intensity and direction at different observation frequencies. At shorter observation durations, the air-sea flux values measured at 100 Hz were smaller than the 20 Hz measurements and had opposite directions. In addition, the WPL correction reduced the overall air-sea flux and partially minimized the effect of observation frequency on the air-sea flux intensity. These results showed that high-frequency observations showed more turbulence variations than low-frequency observations. This conclusion could promote an understanding of small-scale turbulence variations.