Japan Geoscience Union Meeting 2018

Presentation information

[EJ] Evening Poster

A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS06] Atmospheric Chemistry

Wed. May 23, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University), Tomoki Nakayama(Graduate School of Fisheries and Environmental Sciences, Nagasaki University), Sakae Toyoda(東京工業大学物質理工学院, 共同), Nawo Eguchi(Kyushu University)

[AAS06-P13] MAX-DOAS retrieval of aerosol extinction properties in Beijing, China

*Cheng Liu1,3, Chengzhi Xing1, Shanshan Wang2, Haoran Liu1, Wei Tan1,3, Jianguo Liu3 (1.USTC, 2.Fudan Univ., 3.AIOFM)

Keywords:MAX-DOAS, aerosol, pollution process

Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements were performed in the campus of Chinese Academy of Meteorological Sciences (CAMS) in Beijing, China. The O4 absorption in the visible (VIS) and ultraviolet (UV) spectral regions were used to retrieve the aerosol extinction profiles and aerosol optical depths (AODs) using the Heidelberg Profile (HeiPro) algorithm in haze days and non-haze days, respectively. The results show that the correlation between retrieved AODs and the correlative Aerosol Robotic Network (AERONET) AODs in VIS region (R = 0.86) is better than that in UV region (R = 0.62) in haze days. However, the correlations described above are similar in VIS region (R = 0.96) and UV region (R = 0.97) in non-haze days. There is a considerable overestimation on AODs in UV region than in VIS region under hazy conditions, which could be attributed to the light diffusion and the uncertainties in aerosol physical and chemical input parameters in the Radiative Transfer Model (SCIATRAN) simulations. The retrieved aerosol extinction profiles using the exponential decreasing a priori show a great agreement with that measured by light detection and ranging (lidar), especially under clear-sky conditions. Moreover, we found that the retrieved sensitvity (averaging kernel) at different altitudes in UV region is smaller that in VIS region, which propably results in the overestimation on the aerosol extinction at low altitudes in UV region under hazy conditions.