Aerosol vertical distribution characteristics over the Tibetan Plateau

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Deng, Z.Q.^1 ; Han, Y.X.^2 ; Zhao, Q.^3 ; Li, J.^3

Institute of Arid Meteorology, CMA, Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province, Lanzhou, Lanzhou, China^1

School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, China^2

College of Resources and Environmental Science, Lanzhou University, Lanzhou, China^3

关键词: Aerosol extinction coefficient;    Aerosol optical depths;    Correlation coefficient;    Ground-based observations;    Stratospheric aerosol extinction;    Stratospheric aerosols;    Tropospheric aerosols;    Vertical distributions;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012004/pdf
DOI  :  10.1088/1755-1315/17/1/012004

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The Stratospheric Aerosol and Gas Experiment II (SAGE II) aerosol products are widely used in climatic characteristic studies and stratospheric aerosol pattern research. Some SAGE II products, e.g., temperature, aerosol surface area density, 1020 nm aerosol extinction coefficient and dust storm frequency, from ground-based observations were analysed from 1984 to 2005. This analysis explored the time and spatial variations of tropospheric and stratospheric aerosols on the Tibet Plateau. The stratospheric aerosol extinction coefficient increased more than two orders of magnitude because of a large volcanic eruption. However, the tropospheric aerosol extinction coefficient decreased over the same period. Removing the volcanic eruption effect, the correlation coefficient for stratospheric AOD (Aerosol Optical Depth) and tropospheric AOD was 0.197. Moreover, the correlation coefficient for stratospheric AOD and dust storm frequency was 0.315. The maximum stratospheric AOD was attained in January, the same month as the tropospheric AOD, when the Qaidam Basin was the centre of low tropospheric AOD and the large mountains coincided with high stratospheric AOD. The vertical structure generated by westerly jet adjustment and the high altitude of the underlying surface of the Tibetan Plateau were important factors affecting winter stratospheric aerosols.