Dear All,
It is too early to speculate on whether cloud seeding over a small area
of the ocean could reverse this trend. The summer monsoon is a very
broad-scale circulation, and this would need some GCM simulations to
check, but I would guess there are not nearly enough regions with low
clouds to seed to have any impact on the summer monsoon. In summer it is
more cloudy over land than ocean because of the monsoon. How can you
find enough clouds over the ocean to seed, even if albedo enhancement
might work? And this has the same termination problem as other SRM
suggestions.
What this /Science /article does is to reinforce our previous result
that stratospheric aerosols will reduce summer precip over Asia.
Aerosols, in the troposphere or stratosphere, cool the land more than
the ocean, thus reducing the temperature contrast that drives the monsoon.
Alan
[On sabbatical for current academic year. The best way to contact me
is by email, rob...@envsci.rutgers.edu, or at 732-881-1610 (cell).]
Alan Robock, Professor II (Distinguished Professor)
Editor, Reviews of Geophysics
Director, Meteorology Undergraduate Program
Associate Director, Center for Environmental Prediction
Department of Environmental Sciences Phone: +1-732-932-9800 x6222
Rutgers University Fax: +1-732-932-8644
14 College Farm Road E-mail: rob...@envsci.rutgers.edu
New Brunswick, NJ 08901-8551 USA http://envsci.rutgers.edu/~robock
On 12/10/2011 8:32 AM, John Latham wrote:
Hello Ken et al,
To elaborate slightly on Ken's points, we are examining (via modelling)
two other "regional" geoengineering possibilities to which Marine Cloud
Brightening might be applicable. Both involve the cooling of oceanic
surface waters in critical regions. One is the protection of coral
reefs, and the other the weakening of hurricanes [by cooling the
waters in which they spawn and develop].Our highly provisional first
results look encouraging.
The Seitz microbubble technique for albedo enhancement might also be
applicable to these issues.
All Best, John. lat...@ucar.edu
John Latham
Address: P.O. Box 3000,MMM,NCAR,Boulder,CO 80307-3000
Email: lat...@ucar.edu or john.latha...@manchester.ac.uk
Tel: (US-Work) 303-497-8182 or (US-Home) 303-444-2429
or (US-Cell) 303-882-0724 or (UK) 01928-730-002
http://www.mmm.ucar.edu/people/latham
________________________________________
From: geoengineering@googlegroups.com [geoengineering@googlegroups.com] on
behalf of Ken Caldeira [kcalde...@carnegie.stanford.edu]
Sent: Saturday, December 10, 2011 3:36 PM
To: gorm...@waitrose.com
Cc: williamcgbu...@gmail.com; geoengineering
Subject: Re: [geo] New Article on Aerosols and South Asian Monsoons in Science
I agree that this paper is interesting and relevant.
It suggests to me that it possible that tropospheric aerosols (or possibly
cloud whitening or even ocean pumps) over the Indian ocean might increase
rainfall over Asia.
Not only is this of scientific interest, but if regional climate modification
are possible and are expected to produce results that people like, then this it
would be easier for me to imagine coming to a regional rather than global
decision to engage in a deployment (although there would of course be some
distal effects).
_______________
Ken Caldeira
Carnegie Institution Dept of Global Ecology
260 Panama Street, Stanford, CA 94305 USA
+1 650 704 7212
kcalde...@carnegie.stanford.edu<mailto:kcalde...@carnegie.stanford.edu>
http://dge.stanford.edu/labs/caldeiralab @kencaldeira
On Thu, Dec 8, 2011 at 2:28 AM, John
Gorman<gorm...@waitrose.com<mailto:gorm...@waitrose.com>> wrote:
I am surprised that this post didn't get any replies. It seemed rather
important to me because reduction in the Indian monsoon has always been one of
the arguments against stratospheric aerosol. (Together with damage to the ozone
layer) My answer has always been that the Indian monsoon has already reduced
considerably over the last 30 years probably due to some aspect of global
warming
The paper was quite difficult for a non climate scientist but the conclusion
seems to be that global warming alone would probably increase the Indian
monsoon but that industrial smog over Asia (aka tropospheric aerosol) disturbs
the North-South circulation between the northern and southern hemispheres
leading to a reduction.
An early solution to the industrial smog problem in Asia is probably as
unlikely as an early reduction in CO2 emissions. So maybe global stratospheric
aerosol plans should start by offering a solution to the problem of the Indian
monsoon reduction as well as giving an overall reduction in global warming.
Maybe the same climate models that produced this conclusion could be used to
produce a suitable geoengineering plan.
Regards
John Gorman
----- Original Message -----
From: Wil Burns<mailto:williamcgbu...@gmail.com>
To: geoengineering<mailto:geoengineering@googlegroups.com>
Sent: Friday, October 28, 2011 2:50 AM
Subject: [geo] New Article on Aerosols and South Asian Monsoons in Science
Anthropogenic Aerosols and the Weakening of the South Asian Summer Monsoon,
Massimo A. Bollasina et al.
Changes in monsoon rainfall are caused by human-produced aerosols slowing the
tropical atmospheric circulation.
http://www.sciencemag.org/cgi/content/summary/334/6055/502
=======================================================================================
Dr. Wil Burns, Associate Director
Master of Science - Energy Policy& Climate Program
Johns Hopkins University
1717 Massachusetts Avenue, NW
Room 104J
Washington, DC 20036
202.663.5976<tel:202.663.5976> (Office phone)
650.281.9126<tel:650.281.9126> (Mobile)
wbu...@jhu.edu<mailto:wbu...@jhu.edu>
http://advanced.jhu.edu/academic/environmental/master-of-science-in-energy-policy-and-climate/index.html
SSRN site (selected publications): http://ssrn.com/author=240348
Skype ID: Wil.Burns
Teaching Climate/Energy Law& Policy Blog: http://www.teachingclimatelaw.org
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