Observations of atmospheric CO and CO based on in-situ and ground-based remote sensing measurements at Hefei site, China.

The characteristics of long time series of CO and CO surface concentrations, tropospheric and total column dry-air mole fractions (DMF) from May 2015 to December 2019 were investigated. Both CO and CO show different seasonality for the three datasets. The annual increasing trend of CO is similar for all three datasets.