| Model Analysis of the Anthropogenic Aerosol Effect on Clouds over East Asia |
| |
| 作者姓名： | GAO Yi ZHANG Mei-Gen LIU Xiao-Hong ZHAO Chun |
| |
| 基金项目： | supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-Q11-04);the “Strategic Priority Research Program” of the Chinese Academy of Sciences (XDA05100502) |
| |
| 摘 要： | A coupled meteorology and aerosol/chemistry model WRF-Chem(Weather Research and Forecast model coupled with Chemistry) was used to conduct a pair of simulations with present-day(PD) and preindustrial(PI) emissions over East Asia to examine the aerosol indirect effect on clouds.As a result of an increase in aerosols in January,the cloud droplet number increased by 650 cm-3 over the ocean and East China,400 cm-3 over Central and Southwest China,and less than 200 cm-3 over North China.The cloud liquid water path(LWP) increased by 40-60 g m-2 over the ocean and Southeast China and 30 g m-2 over Central China;the LWP increased less than 5 g m-2 or decreased by 5 g m-2 over North China.The effective radius(Re) decreased by more than 4 μm over Southwest,Central,and Southeast China and 2μm over North China.In July,variations in cloud properties were more uniform;the cloud droplet number increased by approximately 250-400 cm-3,the LWP increased by approximately 30-50 g m-2,and Re decreased by approximately 3 ?m over most regions of China.In response to cloud property changes from PI to PD,shortwave(SW) cloud radiative forcing strengthened by 30 W m-2 over the ocean and 10 W m-2 over Southeast China,and it weakened slightly by approximately 2-10 W m-2 over Central and Southwest China in January.In July,SW cloud radiative forcing strengthened by 15 W m-2 over Southeast and North China and weakened by 10 W m-2 over Central China.The different responses of SW cloud radiative forcing in different regions was related to cloud feedbacks and natural variability.
|
| 关 键 词： | WRF-Chem aerosol indirect effect cloud properties cloud radiative forcing |
Model Analysis of the Anthropogenic Aerosol Effect on Clouds over East Asia |
| |
| GAO Yi,ZHANG Mei-Gen,LIU Xiao-Hong,ZHAO Chun.Model Analysis of the Anthropogenic Aerosol Effect on Clouds over East Asia[J].Atmospheric and Oceanic Science Letters,2012,5(1):1-7. |
| |
| Authors: | GAO Yi ZHANG Mei-Gen LIU Xiao-Hong and ZHAO Chun |
| |
| Institution: | 1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chi-nese Academy of Sciences, Beijing 100029, China; 2. Pacific Northwest National Laboratory, Richland, Washington 99352, USA;1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chi-nese Academy of Sciences, Beijing 100029, China;2. Pacific Northwest National Laboratory, Richland, Washington 99352, USA;2. Pacific Northwest National Laboratory, Richland, Washington 99352, USA |
| |
| Abstract: | A coupled meteorology and aerosol/chemistry model WRF-Chem (Weather Research and Forecast model coupled with Chemistry) was used to conduct a pair of simulations with present-day (PD) and preindustrial (PI) emissions over East Asia to examine the aerosol indirect effect on clouds. As a result of an increase in aerosols in January, the cloud droplet number increased by 650 cm-3 over the ocean and East China, 400 cm-3 over Central and Southwest China, and less than 200 cm-3 over North China. The cloud liquid water path (LWP) increased by 40-60 g m-2 over the ocean and Southeast China and 30 g m-2 over Central China; the LWP increased less than 5 g m-2 or decreased by 5 g m-2 over North China. The effective radius (Re) decreased by more than 4 mm over Southwest, Central, and Southeast China and 2 mm over North China. In July, variations in cloud properties were more uniform; the cloud droplet number increased by approximately 250-400 cm-3, the LWP increased by approximately 30-50 g m-2, and Re decreased by approximately 3 mm over most regions of China. In response to cloud property changes from PI to PD, shortwave (SW) cloud radiative forcing strengthened by 30 W m-2 over the ocean and 10 W m-2 over Southeast China, and it weakened slightly by approximately 2-10 W m-2 over Central and Southwest China in January. In July, SW cloud radiative forcing strengthened by 15 W m-2 over Southeast and North China and weakened by 10 W m-2 over Central China. The different responses of SW cloud radiative forcing in different regions was related to cloud feedbacks and natural variability. |
| |
| Keywords: | WRF-Chem aerosol indirect effect cloud properties cloud radiative forcing |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《大气和海洋科学快报》浏览原始摘要信息 |
| 点击此处可从《大气和海洋科学快报》下载免费的PDF全文 |
|
