[Ecsa] ASP seminar and brown bag lunch

Ben Johnson benj at ucar.edu
Mon Apr 18 15:20:30 MDT 2005


ASP would like to invite all postdocs and early career scientists to the
ASP seminar and brown bag lunch with V Ramanathan, this Wedsnesday (20th),
at the Mesa Lab. Ramanathan is one of the world leaders in the fields of
aerosols, chemistry, clouds and climate and is currently spending his
Sabbatical here at NCAR. The lunch will provide an opportunity to meet him
and ask questions about his research, his career, and global issues that
he is involved with.

Below are the seminar details. Also check out his webpage
(http://www-ramanathan.ucsd.edu/address.html) for an overview of his
research interests.

Thank you

Ben Johnson

ASP Seminar, this Wednesday, 11am, Mesa Lab seminar room
Brown bag lunch, from 12:30 in the Chapman room

Global Dimming:  How large is it?

V. Ramanathan
Scripps Institution of Oceanography
(Currently Visiting Scientist at NCAR)

Several studies have reported that there was a large reduction, as large
as -10 W.m -2, of surface solar radiation worldwide during the 1950s to
1980s, and a partial recovery of this dimming during the following
decades. If this was indeed the case, then this dimming trend must have
played a large role in the observed climate trends. In this study, I will
explore the magnitude of the dimming that can be accounted for by natural
and anthropogenic factors and the implications for the observed trends in
surface temperatures and rainfall. One fundamental inference from the
Global Dimming studies is the need for a Global Albedo theory that can
explain why it is around 30% and in addition, account for its long term
variations. I will conclude with an experimental approach for developing
such a theory.

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