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The Wutaishan Station (WTS) in Shanxi Province is built on the Wutai Mountain (2208 m a. s. l.) known as the "North China Roof". There is no obvious industrial source around the station and the surrounding forest vegetation is well covered. This paper uses the online observation data of atmospheric CO2 (Picarro-G2301) from March 2017 to February 2018 at WTS, and uses the combined filtering method of REBS and MET to calculate the CO2 average background concentration of WTS, (410.9 ± 6.4) × 10-6, which can represent the background concentration of atmospheric CO2 in Shanxi and surrounding areas. In addition, based on meteorological data, the following conclusions are drawn. The daily variation of CO2 concentration in WTS among four seasons is from 2.4 × 10-6 to 4.8 × 10-6, which is relatively flat. There is a negative correlation between CO2 concentration and surface wind speed in spring and winter, with R being −0.44 and −0.46, respectively. Using backward trajectory analysis method, it is concluded that the wind from SE-S-SW can effectively increase the native CO2 concentration, whether it is the transmission from high air masses or surface wind.

Atmospheric CO2 Data Filtering Method and Characteristics of the Mole Fractions at Wutaishan Station in Shanxi of China