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Discussion papers
https://doi.org/10.5194/acp-2019-6
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-6
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 28 Jan 2019

Research article | 28 Jan 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Observational evidence of particle condensational growth in the UTLS over Tibetan Plateau

Qianshan He1,2, Jianzhong Ma3, Xiangdong Zheng3, Xiaolu Yan3, Holger Vömel4, Frank G. Wienhold5, Wei Gao1,2, Dongwei Liu1,2, Guangming Shi6, and Tiantao Cheng7 Qianshan He et al.
  • 1Shanghai Meteorological Service, Shanghai, China
  • 2Shanghai Key Laboratory of Meteorology and Health, Shanghai, China
  • 3State Key Laboratory of Severe Weather & CMA Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing, China
  • 4Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
  • 5ETH Zurich, Institute for Atmospheric and Climate Science (IAC), CH-8092 Zurich, Switzerland
  • 6Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
  • 7Department of Atmospheric and Oceanic Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai, China

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 (455 nm) > 1.1 and BSR (940 nm) > 1.4., was observed. The Color Index (CI) of the enhanced aerosol layer, defined as the ratio of aerosol backscatter ratios at wavelengths of 940 nm and 455 nm, varied from 4 to 8, indicating the prevalence of dominant fine particles with mode radius less than 0.1 μm. For those aerosol We find that except for the very small particles with (mode radius smaller than 0.04 μm) 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.

Qianshan He et al.
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Short summary
An enhanced aerosol layer in the upper troposphere/lower stratosphere was observed by a COBALD over the Tibetan Plateau, in the summer of 2014. The Color Index of the enhanced aerosol layer indicates the prevalence of dominant fine particles with mode radius less than 0.1 μm. Except for the very small particles at low relative humidity (RHi < 40 %), the relatively large particles in the aerosol layer were generally very hydrophilic as their size increased dramatically with relative humidity.
An enhanced aerosol layer in the upper troposphere/lower stratosphere was observed by a COBALD...
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