Hi All
The authors do say in the second sentence that this refers to the kind
of SRM which uses sulphur in the stratosphere. It would have been even
clearer if this had been mentioned in the title.
With tropospheric sulphur and satellites we can watch temperature
patterns between Cape Verde and the Gulf of Mexico and adjust the
temperature anomaly day-by-day all through the year. Its the same idea
as fitting a steering wheel to a road vehicle so as to go round bends in
the road rather than having all the bends saved in a memory stick at the
factory.
If Twomey was right we could reduce sea surface temperatures by 2 K
using about a hundred spray vessels costing about $40 million a year
over a 25 year life for maintenance and hire purchase repayments. This
seems quite an attractive benefit-to-cost ratio.
Stephen
Emeritus Professor of Engineering Design. School of Engineering,
University of Edinburgh, Mayfield Road, Edinburgh EH9 3DW, 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 15/11/2017 08:27, Andrew Lockley wrote:
https://www.nature.com/articles/s41467-017-01606-0
Nature Communications
<https://www.nature.com/articles/s41467-017-01606-0#search-menu><https://idp.nature.com/authorize/natureuser?client_id=grover&redirect_uri=http%3A%2F%2Fwww.nature.com%2Farticles%2Fs41467-017-01606-0>
Impacts of hemispheric solar geoengineering on tropical cyclone
frequency
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Article | OPEN
Impacts of hemispheric solar geoengineering on tropical cyclone
frequency
* Anthony C. Jones
<https://www.nature.com/articles/s41467-017-01606-0#auth-1>,
* James M. Haywood
<https://www.nature.com/articles/s41467-017-01606-0#auth-2>,
* […]
* Andy Jones <https://www.nature.com/articles/s41467-017-01606-0#auth-7>
* /Nature Communications/ 8, Article number: 1382(2017)
* doi:10.1038/s41467-017-01606-0
* Download Citation
<https://www.nature.com/articles/s41467-017-01606-0.ris>
*
o Atmospheric science
<https://www.nature.com/subjects/atmospheric-science>
o Climate and Earth system modelling
<https://www.nature.com/subjects/climate-and-earth-system-modelling>
Received:
20 March 2017
Accepted:
02 October 2017
Published online:
14 November 2017
Abstract
Solar geoengineering refers to a range of proposed methods for
counteracting global warming by artificially reducing sunlight at
Earth’s surface. The most widely known solar geoengineering proposal
is stratospheric aerosol injection (SAI), which has impacts analogous
to those from volcanic eruptions. Observations following major
volcanic eruptions indicate that aerosol enhancements confined to a
single hemisphere effectively modulate North Atlantic tropical cyclone
(TC) activity in the following years. Here we investigate the effects
of both single-hemisphere and global SAI scenarios on North Atlantic
TC activity using the HadGEM2-ES general circulation model and various
TC identification methods. We show that a robust result from all of
the methods is that SAI applied to the southern hemisphere would
enhance TC frequency relative to a global SAI application, and vice
versa for SAI in the northern hemisphere. Our results reemphasise
concerns regarding regional geoengineering and should motivate
policymakers to regulate large-scale unilateral geoengineering deployments
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