1153 / 2024-09-20 15:04:55

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

Eddy correlation method,100 Hz,Gas analyzer,Air-sea flux,Observation frequency

Observational experiments of sea air water vapor and carbon dioxide fluxes were carried out at the Yantai National Satellite Ocean Calibration Platform and the jetty at Monolithic Beach, Juehua Island, using a gas analyzer with a frequency of 100 Hz. The experimental data were subjected to a series of processing steps, including wild point rejection, linear detrending, delay correction, coordinate rotation, time matching, and WPL correction to ensure the accuracy of the data. The overall quality of the data was confirmed to be satisfactory through spectral analysis row turbulence spectrum analysis, turbulence smoothness test and turbulence development adequacy test quality checks.

The observations show that the difference in the seawater fluxes between the high-frequency and low-frequency measurements on the two platforms becomes more pronounced as the wind speed increases. The results of the effects of environmental factors such as wind speed, temperature and water vapor on the fluxes under both high-frequency and low-frequency observations show that turbulence changes very rapidly, and therefore so do concentration and density, and that the high-frequency observations can obtain more detailed information on turbulence changes, which can further enable changes in atmospheric fluxes of gases of smaller concentrations to be observed on smaller time scales.