HR: 0800h
AN: A11A-0036    [Abstracts]
TI: Pollution Effects on Condensation Evaporation and Cloud Coverage of Warm Cumulus Cloud
AU: * Altaratz, O
EM: orit.altaratz@weizmann.ac.il
AF: Dept of Environ. Sciences Weizmann Institute Israel, Herzl, Rehovot, 76100, Israel
AU: Koren, I
EM: ilan.koren@weizmann.ac.il
AF: Dept of Environ. Sciences Weizmann Institute Israel, Herzl, Rehovot, 76100, Israel
AU: Reisin, T
EM: tgreisin@gmail.com
AF: Soreq Nuclear Research Center, Yavne, Yavne, 81800, Israel
AU: Kostinski, A
EM: alex_kostinski@mtu.edu
AF: Department of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, Mic MI 49931-1, United States
AU: Feingold, G
EM: Graham.Feingold@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, Col 80305, United States
AU: Levin, Z
EM: zevlev@post.tau.ac.il
AF: Dept of Geophysics and Planetary Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv, 69978, Israel
AU: Yin, Y
EM: yinyan@nuist.edu.cn
AF: Dept Appl Meteorol. Nanjing Univ Informat Sci & Technol, Nanjing, Nanjing, 000000, China
AB: Aerosols can affect cloud lifetime and dimensions in opposing ways. It was shown that the cloud's lifetime can increase due to rain suppression or decrease due to enhanced evaporation. A numerical cloud model is used to study the pollution effects on moderate-sized, coastal, convective clouds. The results show that polluted convective clouds produce larger rain drops, due to a more efficient collection process. The evaporation process is more significant at the margins of the polluted clouds (compared to the clean cloud) and it is mostly from the small droplets mode in the size distribution. We measure the overall effect on the integrated cloud coverage.
DE: 0320 Cloud physics and chemistry
DE: 3311 Clouds and aerosols
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting