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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
23 Feb 2017
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Aerosol Effects on the Development of Cumulus Clouds over the Tibetan Plateau
Xu Zhou1,5, Naifang Bei2, Hongli Liu3, Junji Cao1, Li Xing1, Wenfang Lei4, Luisa T. Molina4, and Guohui Li1 1Key Lab of Aerosol Chemistry and Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China
2School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
3State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China
4Molina Center for Energy and the Environment, La Jolla, CA, USA
5University of Chinese Academy of Science, Beijing, China
Abstract. The aerosol-cloud interaction over the Tibetan Plateau has been investigated using a cloud-resolving weather research and forecasting model with a two-moment bulk microphysical scheme including aerosol effects on cloud condensation nuclei and ice nuclei. Two types of cumulus clouds with a similar convective available potential energy, occurring over the Tibetan Plateau (Cu-TP) and North China Plain (Cu-NCP) in August 2014, are simulated to explore the response of convective clouds to aerosols. A set of aerosol profiles is used in the simulations, with the surface aerosol number concentration varying from 20 to 9000 cm−3 and the sulfate mass concentration varying from 0.02 to 9.0 µg cm−3. Increasing aerosol concentrations generally enhances the cloud core updraft and maximum updraft, intensifying convections in Cu-TP and Cu-NCP. However, the core updraft is much stronger in Cu-TP than Cu-NCP, because of the early occurrence of the glaciation process in Cu-TP that is triggered at an elevation above 4000 m. The precipitation increases steadily with aerosol concentrations in Cu-NCP, caused by the suppression of the warm rain but efficient mix-phased precipitation due to the reduced cloud droplet size. The precipitation in Cu-TP also increases with aerosol concentrations, but the precipitation enhancement is not substantial compared to that in Cu-NCP with high aerosol concentrations. The aerosol-induced intensification of convections in Cu-TP not only facilitates the precipitation, but also transports more ice-phase hydrometeors into the upper troposphere to decrease the precipitation efficiency. Considering the very clean atmosphere over the Tibetan Plateau, elevated aerosol concentrations can remarkably enhance convections due to its specific topography, which not only warms the middle troposphere to influence the Asian summer monsoon, but also delivers hydrometeors into the upper troposphere to allow more water vapor to travel into the lower stratosphere.

Citation: Zhou, X., Bei, N., Liu, H., Cao, J., Xing, L., Lei, W., Molina, L. T., and Li, G.: Aerosol Effects on the Development of Cumulus Clouds over the Tibetan Plateau, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-148, in review, 2017.
Xu Zhou et al.
Xu Zhou et al.


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