The developing of DOAS in China

Abstract In this paper, the developing of DOAS (Differential Optical Absorption Spectroscopy) in China is presented. The measurement campaigns were performed from November,2001 to February, 2002 in Shanghai and from June, 2001 to April, 2002 in AIOFM Ahhui Institute of Optical and Fine Mechanics Hefei respectively to determine the concentration of SO 2 , NO 2 and O 3 in ambient air. For measuring the distribution of pollutants in troposphere, a new kink of DOAS system with high spatial and temporal resolution was developed under the cooperation between German and Chinese researcher. This work was described in the latest part of this paper. Key words: DOAS, Multi-beam, Pollutant, Spectrum, Tomography. 1. Introduction Since it was first introduced in the later 70’s by U.Platt and Perner 1 DOAS has been widely used to measure the concentration of toxic gases such as SO 2 , NO 2 , O 3 , C 6 H 6 , IO etc in atmosphere by many research groups all around the world. A lot of work has been done to improving the stability, precision, spatial and temporal resolution of the DOAS. Several tropospheric trace gases, such as NO