Preprints
https://doi.org/10.5194/amt-2023-3
https://doi.org/10.5194/amt-2023-3
15 May 2023
 | 15 May 2023
Status: this preprint is currently under review for the journal AMT.

Effect of land-sea air masses transport on spatiotemporal distributions of atmospheric CO2 and CH4 mixing ratios over the south Yellow Sea

Jiaxin Li, Kunpeng Zang, Yi Lin, Yuanyuan Chen, Shuo Liu, Shanshan Qiu, Kai Jiang, Xuemei Qing, Haoyu Xiong, Haixiang Hong, and Shuangxi Fang

Abstract. To reveal the spatiotemporal distributions of atmospheric CO2 and CH4 mixing ratios and regulation mechanisms over the China shelf sea, two field surveys were conducted in the south Yellow Sea in China in November 2012 and June 2013, respectively. Observed results showed that mean atmospheric CO2 and CH4 mixing ratios were 403.50 ± 13.70 ppm and 1934.1 ± 33.6 ppb in November 2012, and 396.40 ± 12.30 ppm and 1919.2 ± 30.2 ppb in June 2013, respectively. An improved data filtering method were established to flag diverse sources of atmospheric CO2 and CH4 in survey area. Fe found that, compared to the influences of air-sea exchange, the spatiotemporal distributions of atmospheric CO2 and CH4 mixing ratios over the south Yellow Sea were dominated by land-sea air masses transport, which was driven by seasonal monsoon. In addition, atmospheric CO2 and CH4 mixing ratios over the south Yellow Sea could be elevated remarkably in a distance of approximate 20 km offshore by land-to-sea air masses transportation from the Asia Continent during early winter monsoon.

Jiaxin Li et al.

Status: open (until 19 Jun 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Jiaxin Li et al.

Jiaxin Li et al.

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Short summary
Based on observed data of CO2 and CH4 and meteorological parameters over the Yellow Sea in November 2012 and June 2013, a data process and quality control method were optimized and established to filter the data influenced by multiple reasons. Spatial and seasonal variations of CO2 and CH4 mixing ratios were mainly controlled by the East Asian Monsoon, while the influence of air-sea exchange was slight.