Study on Aerosol Properties Based on CALIPSO in Representative Regions over China

Xing-xing GAO, Yan CHEN, Lei ZHANG, Wu ZHANG

Abstract


To assess the aerosol direct and indirect radiative forcing, this paper analyzed the seasonal aerosol optical properties and vertical distribution characteristics in eight representative regions over China by using CALIPSO Level 2 products. The seasonal aerosol optical properties were validated by the AERONET data. The results show that the Taklamakan Desert (TD) and Tibet Plateau (TP) have the greatest depolarization and color ratios (PDR and CR) while the Northeast Plain (NP), Sichuan Basin (SB), North China Plain (NCP) and Yangtze River Delta (YRD) have the smallest PDR and CR, the Loess Plateau (LP) has intermediate PDR and CR, and that the Pearl River Delta (PRD) has the same PDR and greater CR compared with the polluted regions. The dust is transported to the middle and upper troposphere in spring, the strong vertical convection activities in summer transport massive aerosols from the atmospheric boundary layer to the free troposphere, and the stable meteorological conditions in autumn and winter trap massive aerosols within the boundary layer. The ratio of the AOD within 1.5 km above the ground to the total AOD and the extinction lapse rate in winter are greater than those in other seasons and 48.25% and 0.13km-2, respectively. The extinction lapse rates in the planetary boundary layer for the heavier polluted regions are greater than those in the polluted regions.

Keywords


Aerosol, Vertical distribution, Optical properties, CALIPSO


DOI
10.12783/dteees/eesd2017/11976

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