KMS Chongqing Institute of Green and Intelligent Technology, CAS
Observational evidence of particle hygroscopic growth in the upper troposphere-lower stratosphere (UTLS) over the Tibetan Plateau | |
He, Qianshan1,2; Ma, Jianzhong3,4; Zheng, Xiangdong3,4; Yan, Xiaolu3,4; Vomel, Holger5; Wienhold, Frank G.6; Gao, Wei1,2; Liu, Dongwei1,2; Shi, Guangming7; Cheng, Tiantao8 | |
2019-07-02 | |
摘要 | We measured the vertical profiles of backscatter ratio (BSR) using the balloon-borne, lightweight Compact Optical Backscatter AerosoL Detector (COBALD) instruments above Linzhi, located in the southeastern Tibetan Plateau, in the summer of 2014. An enhanced aerosol layer in the upper troposphere-lower stratosphere (UTLS), 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 (ABSRs) at wavelengths of 940 and 455 nm, varied from 4 to 8, indicating the prevalence of fine particles with a mode radius of less than 0.1 pm. We find that unlike the very small particles (mode radius smaller than 0.04 mu m) 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. This result indicates that water vapor can play a very important role in increasing the size of fine particles in the UTLS over the Tibetan Plateau. Our observations provide observation-based evidence supporting the idea that aerosol particle hygroscopic growth is an important factor influencing the radiative properties of the Asian Tropopause Aerosol Layer (ATAL) during the Asian summer monsoon. |
DOI | 10.5194/acp-19-8399-2019 |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
卷号 | 19期号:13页码:8399-8406 |
通讯作者 | Ma, Jianzhong(majz@cma.gov.cn) |
收录类别 | SCI |
WOS记录号 | WOS:000530852700003 |
语种 | 英语 |