Hi All
The tropospheric sea salt spraying pattern used in this paper was steady
through the year and only between plus and minus 30 degrees. We need to
ask if there could be more intelligent ways to choose places and times
with regard to actual climate observations, the phase of monsoons and el
Nino.
Stephen
Emeritus Professor of Engineering Design. School of Engineering,
University of Edinburgh, Mayfield Road, Edinburgh EH9 3JL, Scotland
[email protected], Tel +44 (0)131 650 5704, Cell 07795 203 195,
WWW.homepages.ed.ac.uk/shs, YouTube Jamie Taylor Power for Change
On 22/08/2015 01:13, Andrew Lockley wrote:
http://onlinelibrary.wiley.com/doi/10.1002/2015JD023269/abstract
A Comparison of Temperature and Precipitation Responses to Different
Earth Radiation Management Geoengineering Schemes
Authors
J. Crook,
L.S. Jackson,
S.M. Osprey,
P.M. Forster
14 August 2015
doi: 10.1002/2015JD023269
Abstract
Earth radiation management has been suggested as a way to rapidly
counteract global warming in the face of a lack of mitigation efforts,
buying time and avoiding potentially catastrophic warming. We compare
six different radiation management schemes that use surface,
troposphere and stratosphere interventions in a single climate model
in which we projected future climate from 2020 to 2099 based on
RCP4.5. We analyze the surface air temperature responses to determine
how effective the schemes are at returning temperature to its
1986-2005 climatology and analyze precipitation responses to compare
side effects. We find crop albedo enhancement is largely ineffective
at returning temperature to its 1986-2005 climatology. Desert albedo
enhancement causes excessive cooling in the deserts and severe shifts
in tropical precipitation. Ocean albedo enhancement, sea-spray
geoengineering, cirrus cloud thinning and stratospheric SO2 injection
have the potential to cool more uniformly, but cirrus cloud thinning
may not be able to cool by much more than 1 K globally. We find that
of the schemes potentially able to return surface air temperature to
1986-2005 climatology under future greenhouse gas warming, none has
significantly less severe precipitation side effects than other
schemes. Despite different forcing patterns, ocean albedo enhancement,
sea-spray geoengineering, cirrus cloud thinning and stratospheric SO2
injection all result in large scale tropical precipitation responses
caused by Hadley cell changes and land precipitation changes largely
driven by thermodynamic changes. Widespread regional scale changes in
precipitation over land are significantly different from the 1986-2005
climatology and would likely necessitate significant adaptation
despite geoengineering.
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