Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

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

Summary: First measurements of the Twomey indirect effect using ground-based
remote sensors
Graham Feingold,1
Wynn L. Eberhard,1
Dana E. Veron,2
and Michael Previdi2
Received 19 November 2002; revised 15 January 2003; accepted 6 February 2003; published 20 March 2003.
[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 $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

  

Source: Ackerman, Thomas P. - Department of Atmospheric Sciences, University of Washington at Seattle

 

Collections: Geosciences; Environmental Sciences and Ecology