Jim
What you and Ben Kravitz say about stratospheric SRM with sulphate will
not apply to tropospheric SRM done with sea water. We would be prefer
not to be accused of the drawbacks of a different technology.
Stephen
On 10/08/2012 05:50, Jim Fleming wrote:
/Thus, an obvious path to avoiding sky whitening is to greatly limit
or avoid entirely the intentional introduction of sulfate particles
into the stratosphere./
I agree with the avoiding part of this sentence. I live in Maine
where the sky really is blue and would hate to see skies here and
around the world looking white and hazy as do /"average conditions in
urban areas today."/
Please remember that SRM would also attenuate starlight, so night sky
viewing with sulfate geoengineering would also emulate /"average
conditions in urban areas today."/ How sad. Thus, an obvious path to
preserve the wonder of the night sky is to avoid entirely the
intentional introduction of sulfate particles into the stratosphere.
You can argue from models or from aesthetics and culture.
I think the question mark in the title after whiter skies needs to be
an exclamation point.
Jim
On Thu, Aug 9, 2012 at 11:50 PM, Ken Caldeira
<[email protected] <mailto:[email protected]>>
wrote:
Folks,
We made a YouTube video to go with a recent study on whiter
skies led by Ben Kravitz: http://youtu.be/JO5q2UqBncA
The underlying paper is attached and also available at:
http://www.agu.org/pubs/crossref/2012/2012GL051652.shtml
(subscription required).
The citation is:
B. Kravitz, D.G. MacMartin, and K. Caldeira
Geoengineering: Whiter skies?
GEOPHYSICAL RESEARCH LETTERS, VOL. 39, L11801, 6 PP., 2012
doi:10.1029/2012GL051652
Best,
Ken
PS. While we were at it, we made a YouTube video for a recent
study that was led by Julia Pongratz:
https://www.youtube.com/watch?v=zRh_Zfr6A08
Pongratz, J., and K. Caldeira, 2012: Attribution of atmospheric
CO2 and temperature increases to regions: importance of
preindustrial land use change. Environmental Research Letters,
Vol. 7, 034001 doi:10.1088/1748-9326/7/3/034001
That one is available without a subscription at
http://iopscience.iop.org/1748-9326/7/3/034001/
_______________
Ken Caldeira
Carnegie Institution for Science
Dept of Global Ecology
260 Panama Street, Stanford, CA 94305 USA
+1 650 704 7212
<tel:%2B1%20650%20704%207212>[email protected]
<mailto:[email protected]>
http://dge.stanford.edu/labs/caldeiralab@kencaldeira
*Our YouTube videos:*
Climate change and the transition from coal to low-carbon
electricity: Ken Caldeira
<http://www.youtube.com/watch?v=a9LaYCbYCxo>
Crop yields in a geoengineered climate: Dr. Julia Pongratz
<http://www.youtube.com/watch?v=fhxzOUQVD38>
More videos
<http://dge.stanford.edu/labs/caldeiralab/Caldeira_Videos.html>
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