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- Title
Observational evidence of particle condensational growth in the UTLS over Tibetan Plateau.
- Authors
Qianshan He; Jianzhong Ma; Xiangdong Zheng; Xiaolu Yan; Vömel, Holger; Wienhold, Frank G.; Wei Gao; Dongwei Liu; Guangming Shi; Tiantao Cheng
- Abstract
We measured the vertical profiles of aerosol backscattering ratio (BSR) with a balloon-borne lightweight COBALD at Linzhi, located in the southeastern Tibetan Plateau, in the summer of 2014. An enhanced aerosol layer in the upper troposphere/lower stratosphere (UTLS) are found), with BSR (455nm)>1.1 and BSR (940nm)>1.4., was observed. The Color Index (CI) of the enhanced aerosol layer, defined as the ratio of aerosol backscatter ratios at wavelengths of 940nm and 455nm, varied from 4 to 8, indicating the prevalence of dominant fine particles with mode radius less than 0.1μm. For those aerosol We find that except for the very small particles with (mode radius smaller than 0.04μm) at low relative humidity (RHi<40%), the relatively large particles in the aerosol layer were generally very hydrophilic as their size in dry condition, increasing RHi makesincreased dramatically with relative humidity. This result indicates that water vapor and other gaseous precursor condense onto pre-existing aerosol particles and contributes to the particle growth. While for those with small particle size in dry condition, formation of more newly particle through the gas-to-particle conversion process, resulting in decrease of aerosol mode radius and increase of number concentration. Water vapor can play a very important role in the formation of these high concentrationslarge amounts of fine particles in the UTLS over the Tibetan Plateau. Our observations provide observation-based evidence supporting that the aerosol particle condensational growth is an important process for the summer ATAL enhancement over the Tibetan Plateau.
- Subjects
TIBETAN Plateau; METEOROLOGICAL observations; BACKSCATTERING; ATMOSPHERIC aerosols; TROPOSPHERE; STRATOSPHERE
- Publication
Atmospheric Chemistry & Physics Discussions, 2019, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2019-6