First measurements of the Twomey indirect effect using ground-based remote sensors

被引:262
作者
Feingold, G
Eberhard, WL
Veron, DE
Previdi, M
机构
[1] NOAA, Environm Technol Lab, Boulder, CO 80305 USA
[2] Rutgers State Univ, New Brunswick, NJ 08901 USA
关键词
D O I
10.1029/2002GL016633
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
[1] We demonstrate first measurements of the aerosol indirect effect using ground-based remote sensors at a continental US site. The response of nonprecipitating, ice-free clouds to changes in aerosol loading is quantified in terms of a relative change in cloud-drop effective radius for a relative change in aerosol extinction under conditions of equivalent cloud liquid water path. This is done in a single column of air at a temporal resolution of 20 s (spatial resolution of similar to100 m). Cloud-drop effective radius is derived from a cloud radar and microwave radiometer. Aerosol extinction is measured below cloud base by a Raman lidar. Results suggest that aerosols associated with maritime or northerly air trajectories tend to have a stronger effect on clouds than aerosols associated with northwesterly trajectories that also have local influence. There is good correlation (0.67) between the cloud response and a measure of cloud turbulence.
引用
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页码:20 / 1
页数:4
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