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

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

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30f..20f&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 6, pp. 20-1, CiteID 1287, DOI 10.1029/2002GL016633

Physics

58

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques, Global Change: Atmosphere (0315, 0325)

Scientific paper

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 ~100 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.

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