Assessment of MAX-DOAS aerosol retrieval over North China

作者：Wang Ting^*; Wang PuCai

来源：Acta Geophysica Sinica, 2018, 61(2): 494-503.

DOI：10.6038/cjg2018L0269

• MAX-DOAS
• O-4
• Aerosol extinction profiles
• AOD

Based on 4-year MAX-DOAS measurements at the Xianghe Observatory, the aerosol extinction profiles and AODs are retrieved using the optimal estimation algorithm and LIDORT radiative transfer model. The results show a general consistency between the retrieved AODs by MAX-DOAS and AERONET product in the same spectral range, with correlation coefficient about 0.9, supporting the capability of MAX-DOAS to derive AOD as well as aerosol extinction profile over North China which suffers enormous air-pollution. The retrieval error tends to be worse in winter-time and morning/evening when the Solar Zenith Angle (SZA) is large, because large SZA induces relatively poor signal to noise ratio and thus large retrieval error. With retrieved aerosol extinction profiles in the Xianghe area, it is found that most of aerosol content is confined within the boundary layer below 1 km with an exponential decay with height. In some cases, however, the aerosol extinction profile peaks at 300 m. With regard to seasonal and diurnal cycles, AOD is higher in mid-day and lower in morning and evening, and annual maximum occurs in summer and minimum in winter. The aerosol loading is heaviest in the case of east wind, suggesting the significant contribution of wind-driven particle transport from Tangshan, a heavy industrial city in North China, to the local accumulation of aerosols in the Xianghe area.

• 出版日期2018-2
• 单位中国科学院大学; 中国科学院大气物理研究所