MAX-DOAS Measurements of Tropospheric NO₂ and HCHO Vertical Profiles at the Longfengshan Regional Background Station in Northeastern China.

ABSTRACT: The vertical profiles of nitrogen dioxide (NO₂) and formaldehyde (HCHO) in the troposphere at the Longfengshan (LFS) regional atmospheric background station (127°36' E, 44°44' N, 330.5 m above sea level) from 24 October 2020 to 13 October 2021 were retrieved from solar scattering spectra by multi-axis differential optical absorption spectroscopy (MAX-DOAS). We analyzed the temporal variations of NO₂ and HCHO as well as the sensitivity of ozone (O₃) production to the concentration ratio of HCHO to NO₂. The largest NO₂ volume mixing ratios (VMRs) occur in the near-surface layer for each month, with high values concentrated in the morning and evening. HCHO has an elevated layer around the altitude of 1.4 km consistently. The means ± stand

SUBMITTER: Liu S 

PROVIDER: S-EPMC10099724 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature