MAX-DOAS measurements in southern China: retrieval of aerosol extinctions and validation using ground-based in-situ data
1College of Environmental Sciences and Engineering, Peking University, Beijing, China
2Institute for Chemistry and Dynamics of the Geosphere (ICG-2), Forschungszentrum Jülich, Germany
3Biogeochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
4Satellite Group, Max Planck Institute for Chemistry, Mainz, Germany
5Institute for Environmental Physics, Universität Heidelberg, Heidelberg, Germany
Abstract. We performed MAX-DOAS measurements during the PRiDe-PRD2006 campaign in the Pearl River Delta region 50 km north of Guangzhou, China, for 4 weeks in June 2006. We used an instrument sampling at 7 different elevation angles between 3° and 90°. During 9 cloud-free days, differential slant column densities (DSCDs) of O4 (O2 dimer) absorptions between 351 nm and 389 nm were evaluated for 6 elevation angles. Here, we show that radiative transfer modeling of the DSCDS can be used to retrieve the aerosol extinction and the height of the boundary layer. A comparison of the aerosol extinction with simultaneously recorded, ground based nephelometer data shows excellent agreement.