Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-16713-2008 http://www.atmos-chem-phys-discuss.net/8/16713/2008/ http://www.atmos-chem-phys-discuss.net/8/16713/2008/acpd-8-16713-2008.html http://www.atmos-chem-phys-discuss.net/8/16713/2008/acpd-8-16713-2008.pdf 16713 16762 2008-09-03 Tropospheric NO₂ column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation D. Chen 052047006@fudan.edu.cn B. Zhou S. Beirle L. M. Chen T. Wagner Department of Environmental Science and Engineering, Fudan University, China Max Planck Institute for Chemistry, Mainz, Germany Zenith-sky scattered sunlight observations using differential optical absorption spectroscopy (DOAS) technique were carried out in Shanghai, China (31.3° N, 121.5° E) since December 2006. At this polluted urban site, the measurement provided NO₂ total columns in the daytime. Here, we present a new method to extract time series of tropospheric vertical column densities (VCD) of NO₂ from these observations. The derived tropospheric NO₂ VCD is an important quantity for the estimation of emissions and for the validation of satellite observations. Our method makes use of assumptions on the relative NO₂ height profiles and on the diurnal variation of the stratospheric NO₂ VCD. The influence of these parameters on the retrieved tropospheric NO₂ VCD is discussed; for a polluted site like Shanghai, the accuracy of our method is estimated to be <20% for solar zenith angle (SZA) lower than 85°. From simultaneously performed long-path DOAS measurement, the NO₂ surface concentration at the same site was observed and the corresponding tropospheric NO₂ VCD was estimated using the assumed seasonal NO₂ profiles in the planetary boundary layer (PBL). 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