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MAX-DOAS measurements in southern China: retrieval of aerosol extinctions and validation using ground-based in-situ data

by X. Li, T. Brauers, M. Shao, R. M. Garland, T. Wagner, T. Deutschmann, A. Wahner
Atmospheric Chemistry and Physics ()

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 degrees and 90 degrees. During 9 cloud-free days, differential slant column densities (DSCDs) of O-4 (O-2 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.

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