Hi Alan--On the Asian monsoon, is it not thought that the air pollution
in India and China are affecting the monsoon in a negative way?
Basically, to really drive the monsoon, is it not the case that one
would want to clear the air pollution? So, I think it is possible, at
least in one direction with a step that would also have co-benefits.
On effects in the rest of the world, I think the question really might
be how far that extent would be. I recall the paper that David Rind did
with the person who suggested that one could take up the world's emitted
CO2 by planting a eucalyptus forest covering all of Australia (watered
by solar powered pumps of some sort) and his GCM run suggested that this
would not have effects on the weather on scales larger than Australia (a
bit surprising to me as well, given the model studies of the effects
that altering the Amazon forest cover could have). [In any case, one
critical problem for the cover Australia with eucalyptus forest idea
would be how vulnerable to forest fires such a forest, once grown, would
be.]
I guess I just think there might be some fuzziness in the definition
were one to think up proposals that would affect a regional phenomenon
or a higher moment than the average such as very large tropical cyclones
(e.g., what if cloud brightening could be used on a continuing basis to
cool by a few degrees the very warm ocean regions where tropical
cyclones tend to greatly intensify just before striking land (e.g., the
Gulf of Mexico and upwind Caribbean region, or the area upwind of the
Philippines, etc.), so one would be modifying (assuming it all worked)
the pdf of tropical cyclone intensity in some region. Or, what if one
used cloud brightening to shift the gradients of SSTs in regions that
tend to influence the tracks of storms heading onto continents in
various regions. I don't think weather modification is quite the right
phrase, nor is global-scale geoengineering the right term--I'm actually
not sure what the right term for such types of intervention might be
(regionally or process-focused interventions?).
Mike
On 2/2/16 4:21 PM, Alan Robock wrote:
Dear Mike,
I think geoengineering also has to be large-scale. So Asian monsoon
maybe (although I don't know how you could do it in isolation and not
affect the rest of the globe), but not hurricane modification, which
would be episodic and small-scale.
Alan
Alan Robock, Distinguished Professor
Editor, Reviews of Geophysics
Department of Environmental Sciences Phone: +1-848-932-5751
Rutgers University Fax: +1-732-932-8644
14 College Farm Road E-mail:[email protected]
New Brunswick, NJ 08901-8551 USAhttp://envsci.rutgers.edu/~robock
☮http://twitter.com/AlanRobock
Watch my 18 min TEDx talk athttp://www.youtube.com/watch?v=qsrEk1oZ-54
On 2/2/2016 4:12 PM, Michael MacCracken wrote:
Hi Alan--In that the term "climate" includes all of the moments of
the system, so including extreme weather, etc., if an approach were
developed that was used consistently to affect on a persistent basis
one characteristic/moment of the system that is usually talked about
as a weather event, would that not be geoengineering? That is, is
geoengineering just a change in the long-term average or might the
term also apply to modification of a particular moment of the system?
For example, would it be geoengineering if one were able to modify
the Asian monsoon on a consistent basis?
Mike
On 2/1/16 1:33 PM, Alan Robock wrote:
Of course, in spite of their title, this is not geoengineering. It
is weather modification.
Alan Robock
Alan Robock, Distinguished Professor
Editor, Reviews of Geophysics
Department of Environmental Sciences Phone: +1-848-932-5751
Rutgers University Fax: +1-732-932-8644
14 College Farm Road E-mail:[email protected]
New Brunswick, NJ 08901-8551 USAhttp://envsci.rutgers.edu/~robock
☮http://twitter.com/AlanRobock
Watch my 18 min TEDx talk athttp://www.youtube.com/watch?v=qsrEk1oZ-54
On 2/1/2016 10:35 AM, Andrew Lockley wrote:
Open access
http://onlinelibrary.wiley.com/doi/10.1002/asl.644/abstract
A geoengineering approach toward tackling tropical cyclones over
the Bay of Bengal
S. Ghosh, A. Sharma, S. Arora and G. Desouza
25 JAN 2016
DOI: 10.1002/asl.644
Atmospheric Science Letters
Keywords:
cyclones;cloud seeding;aerosol injection;WRF;geoengineering
Abstract
The concept of seeding giant-sized ocean salt water aerosols in the
eye-wall of a cyclonic storm abruptly increasing cloud condensation
nuclei (CCN) concentration is investigated. To bring this to
effect, design of a novel injection mechanism – a modified naval
artillery shell, tailor made for the Indian Navy fleet, containing
sea-salt solution to disperse the CCN is proposed. The effect of
the seeding is modeled using a robust optimized warm rain
microphysical scheme – amenable for quick local forecasts within
the Weather Research and Forecast framework. The combined protocol
results in a significant decrease in precipitation tendencies upon
landfall.
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