In-situ observations reveal weak hygroscopicity in the Southern Tibetan Plateau: implications for aerosol activation and indirect effects

As a precursor process to cloud formation, aerosol activation over the Tibetan Plateau (TP) plays a pivotal role in regional cloud-precipitation and global climate. However, its characteristics remain unclear due to the absence of targeted observations in the TP. We conducted a ground in-situ aeroso...

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Published in:NPJ climate and atmospheric science 2024-03, Vol.7 (1), p.77-11, Article 77
Main Authors: Wang, Yuan, Li, Jiming, Fang, Fang, Zhang, Ping, He, Jianjun, Pöhlker, Mira L., Henning, Silvia, Tang, Chenguang, Jia, Hailing, Wang, Yang, Jian, Bida, Shi, Jinsen, Huang, Jianping
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704/106/35/824
704/172/169/824
Aerosols
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Climate Change/Climate Change Impacts
Climatology
Clouds
Earth and Environmental Science
Earth Sciences
Global climate
Hygroscopicity
Parameterization
Precipitation
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description As a precursor process to cloud formation, aerosol activation over the Tibetan Plateau (TP) plays a pivotal role in regional cloud-precipitation and global climate. However, its characteristics remain unclear due to the absence of targeted observations in the TP. We conducted a ground in-situ aerosol-cloud-precipitation experiment in the southern TP (GACPE-STP), thereby unveiling the aerosol activation characteristics in this crucial region. Our findings reveal a weak aerosol activation capacity with low hygroscopicity ( κ ) values of less than 0.1 through multi-method κ measurements, contrasting starkly with the widely recommended κ value of 0.3 for continental regions. A κ parameterization is developed for predicting aerosol activation in this region, which can significantly reduce the overestimations of cloud droplet number concentration and hence aerosol indirect effects caused by using the recommended κ of 0.3. These findings address the unclear characteristics of aerosol activation in the TP region, contributing to the enhancement of regional cloud precipitation and global climate simulations.
doi_str_mv 10.1038/s41612-024-00629-x
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subjects 704/106/35/824
704/172/169/824
Aerosols
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Climate Change/Climate Change Impacts
Climatology
Clouds
Earth and Environmental Science
Earth Sciences
Global climate
Hygroscopicity
Parameterization
Precipitation
title In-situ observations reveal weak hygroscopicity in the Southern Tibetan Plateau: implications for aerosol activation and indirect effects
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