Hi Graham
But why did you study only two regions and only an increase in aerosol?
In a computer is just as easy to reduce them which would keep the world
wide value steady.
While the ones you picked are probably the best for all-year spray they
will not be so good once you have increased the CCN concentration and
there may be others which are nearly as good. For example around
mid-summer the long hours of sunshine, the high fraction of cloud cover,
the clean air and the low boundary layer might make the Barents Sea and
the Aleutians even better in June and July however bad they might be in
December and January when the spray vessels will have all migrated to
the Antarctic.
It is also scientifically interesting to know where the useless places
and seasons are. With coded modulation you do not need to do different
runs for everywhere. You can do just one long run and then select
seasonal subsets and Boolean combinations. The correlation process is
almost instantaneous.
Next you could vary the spray patterns in the light of the actual model
results to close a feedback loop. My engineer's guess for the most
promising control variables will be the temperature differences across
the Indian and Pacific Oceans but with coded modulation you have a good
chance to discover others.
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 30/07/2015 11:27, Graham Mann wrote:
Hi Stephen,
Re: your comment:
> I would be most grateful for information about where and when the
technology should NOT be used.
One thing is that the efficacy of the injection (just in terms of
radiative forcing) various considerably between different regions.
The radiative effects for a given increase in CCN depend strongly on
the background CCN concentration in the region.
That’s partly because the cloud droplet number concentration (CDNC)
against CCN curve is non-linear.
And also because it’s the relative CDNC change that is important for
the brightening effect (rather than the absolute change).
So the same change in tropospheric CCN translates into quite different
radiative forcing in different regions.
Some work by Ben Parkes and others at Leeds (currently unpublished)
that we presented at EGU 2013 (see attached) demonstrates this effect.
For example we see that injecting sea-spray in the North Pacific
stratocumulus region is 3-4 times less effective than in injecting in
the South Pacific Sc region.
And that both regions saturate for increasing injection of sea-spray.
Cheers
Graham
** Dr. Graham Mann, NCAS Senior Research Scientist **
** Institute for Climate & Atmospheric Science T: +44 0113 3431660 **
** Room 10.108, School of Earth & Environment F: +44 0113 3435259 **
** University of Leeds, Leeds, LS2 9JT, U.K. E: [email protected] **
*From:*[email protected]
[mailto:[email protected]] *On Behalf Of *Stephen Salter
*Sent:* 30 July 2015 10:28
*To:* [email protected]
*Subject:* Re: [geo] 2 quick questions for Social scientists,
humanities researchers, philosophers of SRM
Pete,
Thank you for you request.
The one thing I would like is the production of world-wide seasonal
maps of the susceptibility with respect to temperature and
precipitation to changes in the concentration of tropospheric cloud
condensation nuclei from everywhere to everywhere else. I hope that
the coded modulation idea in the attached paper might be useful but
perhaps you can think of better ways. A 1.6 Mb paper is attached
but, if it is chopped, I can send it directly to anyone who emails me
I would be most grateful for information about where and when the
technology should NOT be used.
Stephen
Emeritus Professor of Engineering Design. School of Engineering,
University of Edinburgh, Mayfield Road, Edinburgh EH9 3JL, Scotland
[email protected] <mailto:[email protected]>, Tel +44 (0)131 650 5704,
Cell 07795 203 195, WWW.homepages.ed.ac.uk/shs
<http://WWW.homepages.ed.ac.uk/shs>, YouTube Jamie Taylor Power for Change
On 30/07/2015 10:05, p.j.irvine wrote:
Hi all,
As you might know, I work primarily on the climate response to SRM
and I'd like to know how we can better understand the implications
of SRM and how those implications will depend on what we discover
about its likely consequences. So if you have the time, I'd like
all you social scientists, humanities researchers and philosophers
of SRM to answer these 2 questions:
1) With regards to its consequences, what one thing would help you
to better understand the implications of SRM for your area of
interest?
2) What one thing do you wish that those of us working on the
physical consequences of SRM would bear in mind?
These don't have to be easily achievable and feel free to be
controversial but I'd like to get a taste for what people feel
we'll need to do to understand this issue better.
Cheers,
Pete
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