Erika
In your geoengineering article in Science news due out on 5 June you
quote Ken Caldeira as saying that cloud brightening would decrease
rainfall over land. Alan Robock has collected evidence to show that this
has been observed in volcanic historical eruptions and it has been
predicted for stratospheric aerosols.
However a paper by Bala and others, including Caldeira, says the
opposite is the case for cloud brightening. Their final paragraph reads
/In summary, prior studies have suggested that offsetting global warming
by reflecting sunlight to space would result in a drying of the
continents. In contrast, our study indicates that reflecting sunlight to
space by reducing cloud droplet size over the oceans could lead, on
average, to a moistening of the continents.
/The Bala paper is too big to attach to an email but you can download a
copy from the root of the file below my signature.
The difference is very important and your article could affect decisions
on research funding. May I ask you to look into the matter?
Stephen Salter
/
/
Emeritus Professor of Engineering Design
School of Engineering and Electronics
University of Edinburgh
Mayfield Road
Edinburgh EH9 3JL
Scotland
tel +44 131 650 5704
fax +44 131 650 5702
Mobile 07795 203 195
[email protected]
http://www.see.ed.ac.uk/~shs
Erika Engelhaupt wrote:
My feature story on geoengineering is out in the June 5 issue of
Science News, which you should be receiving a complimentary copy of in
the mail. In the meantime, here is a link to the online version, where
you can also see the illustration featured on our cover:
http://www.sciencenews.org/index/feature/activity/view/id/59391/title/Engineering_a_cooler_Earth
(A better view of the cover is up on /Science News/’ Facebook site:
http://www.facebook.com/#!/photo.php?pid=4002108&id=35695491869
<http://www.facebook.com/#%21/photo.php?pid=4002108&id=35695491869> )
/Science News/ is now also available on select Barnes & Noble and
Borders newsstands nationwide, although I’m not sure if they’ve
received the new issue quite yet.
I hope you enjoy the story and find that I’ve balanced the issues
fairly—there was much more that I would have liked to have included if
I’d had more space.
Best regards,
Erika
Erika Engelhaupt
Deputy News Editor
/Science News///
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