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We performed MAX-DOAS measurements during the PRiDe-PRD2006 campaignin the Pearl River Delta region 50 km north of Guangzhou, China, for 4 weeksin June 2006. We used an instrument sampling at 7 different elevation anglesbetween 3° and 90°. During 9 cloud-free days, differential slantcolumn densities (DSCDs) of O<sub>4</sub> (O<sub>2</sub> dimer) absorptions between351 nm and 389 nm were evaluated for 6 elevation angles. Here, we showthat radiative transfer modeling of the DSCDS can be used to retrieve theaerosol extinction and the height of the boundary layer. A comparison of theaerosol extinction with simultaneously recorded, ground based nephelometerdata shows excellent agreement

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