Effects of aerosol on evaporation, freezing and precipitation in a multiple cloud system

Seoung Soo Lee, Byung Gon Kim, Seong Soo Yum, Kyong Hwan Seo, Chang Hoon Jung, Jun Shik Um, Zhanqing Li, Jinkyu Hong, Ki Ho Chang, Jin Yim Jeong

Research output: Contribution to journalArticle

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Abstract

Aerosol effects on clouds and precipitation account for a large portion of uncertainties in the prediction of the future course of global hydrologic circulations and climate. As a process of a better understanding of interactions between aerosol, clouds and precipitation, simulations are performed for a mixed-phase convective multiple-cloud system over the tropics. Studies on single-cloud systems have shown that aerosol-induced increases in freezing, associated increases in parcel buoyancy and thus the intensity of clouds (or updrafts) are a main mechanism which controls aerosol–cloud–precipitation interactions in convective clouds. However, in the multiple-cloud system that plays much more important roles in global hydrologic circulations and thus climate than single-cloud systems, aerosol effects on condensation play the most important role in aerosol-induced changes in the intensity of clouds and the effects on freezing play a negligible role in those changes. Aerosol-induced enhancement in evaporation intensifies gust fronts and increases the number of subsequently developing clouds, which leads to the substantial increases in condensation and associated intensity of convection. Although aerosol-induced enhancement in freezing takes part in the increases in condensation by inducing stronger convergence around cloud bottom, the increases in condensation are ~one order of magnitude larger than those in freezing. It is found that while aerosol-induced increases in freezing create intermittent extremely heavy precipitation, aerosol-induced increases in evaporation enhance light and medium precipitation in the multiple-cloud system here. This increase in light and medium precipitation makes it possible that cumulative precipitation increases with increasing aerosol concentration, although the increase is small. It is interesting that the altitude of the maximum of the time- and domain-averaged hydrometeor mass densities is quite robust to increases in aerosol concentration. This is because locations of gust fronts and homogeneous freezing do not vary significantly with changing aerosol concentration and this outweighs aerosol effects on hydrometeor size.

Original languageEnglish
Pages (from-to)1069-1087
Number of pages19
JournalClimate Dynamics
Volume48
Issue number3-4
DOIs
Publication statusPublished - 2017 Feb 1

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freezing
evaporation
aerosol
condensation
gust
effect
volcanic cloud
convective cloud
updraft
climate
buoyancy
convection

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Lee, S. S., Kim, B. G., Yum, S. S., Seo, K. H., Jung, C. H., Um, J. S., ... Jeong, J. Y. (2017). Effects of aerosol on evaporation, freezing and precipitation in a multiple cloud system. Climate Dynamics, 48(3-4), 1069-1087. https://doi.org/10.1007/s00382-016-3128-1
Lee, Seoung Soo ; Kim, Byung Gon ; Yum, Seong Soo ; Seo, Kyong Hwan ; Jung, Chang Hoon ; Um, Jun Shik ; Li, Zhanqing ; Hong, Jinkyu ; Chang, Ki Ho ; Jeong, Jin Yim. / Effects of aerosol on evaporation, freezing and precipitation in a multiple cloud system. In: Climate Dynamics. 2017 ; Vol. 48, No. 3-4. pp. 1069-1087.
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Lee, SS, Kim, BG, Yum, SS, Seo, KH, Jung, CH, Um, JS, Li, Z, Hong, J, Chang, KH & Jeong, JY 2017, 'Effects of aerosol on evaporation, freezing and precipitation in a multiple cloud system', Climate Dynamics, vol. 48, no. 3-4, pp. 1069-1087. https://doi.org/10.1007/s00382-016-3128-1

Effects of aerosol on evaporation, freezing and precipitation in a multiple cloud system. / Lee, Seoung Soo; Kim, Byung Gon; Yum, Seong Soo; Seo, Kyong Hwan; Jung, Chang Hoon; Um, Jun Shik; Li, Zhanqing; Hong, Jinkyu; Chang, Ki Ho; Jeong, Jin Yim.

In: Climate Dynamics, Vol. 48, No. 3-4, 01.02.2017, p. 1069-1087.

Research output: Contribution to journalArticle

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AU - Lee, Seoung Soo

AU - Kim, Byung Gon

AU - Yum, Seong Soo

AU - Seo, Kyong Hwan

AU - Jung, Chang Hoon

AU - Um, Jun Shik

AU - Li, Zhanqing

AU - Hong, Jinkyu

AU - Chang, Ki Ho

AU - Jeong, Jin Yim

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