There was a good study at WCRP which showed that much of the inter annual
variability is wind related, as ice is moved towards the Atlantic in
certain years.
I don't know if It's in print yet.
Veli has made this point before, and the modelling seems to support his
view.
This is worrying, as
I agree with Nathan that we shouldn't lose sight of the methane issue,
which is the motive force behind AMEG's assertions and activities. In this
regard, here is a short excerpt from something I posted in December:
*
*
*While declaring a methane emergency and calling for immediate action is
True, but with Arctic warming and general reduction in sea ice and so in
cold air generated in Arctic, it is all related, so just projecting ahead
past levels and characteristics of variability is unlikely, in my view, to
be valid. Also, thermodynamically, it is quite hard to maintain a colder
Dear Mike,
I don't know how you do this 6 to 1 calculation. We found that the
e-folding time for stratospheric aerosols in the Arctic s 2-4 months,
with 4 months in the summer, the relevant time. (see
http://climate.envsci.rutgers.edu/pdf/2008JD010050small.pdf ) If we
compare this to the
Hello Alan,
Re tropospheric health effects:-
Are you talking exclusively about sulphur, or would you apply the
same argument to seawater droplets, as used in MCB?
Estimated global seawater volumetric dissemination rate to produce
cooling to balance warming from 2xCO2 is about 10 m**3 / sec,
Alan
Pollution is a loaded word. Check out
http://www.healthandcare.co.uk/great-gifts/salitair-salt-therapy.html?gclid=CNKH0-ur864CFdISfAodwHUpNA
for evidence that breathing salt is very good for people with lung
diseases. Osmosis is just as effective as anti-biotics at killing bugs
but
Hi Alan—Well, I got the 2 months number from your paper—and used that.
Interesting that a more detailed evaluation indicates that the lifetime in
summer is longer. I think longer times than a week might well be possible in
the troposphere by choosing injection times and meteorological conditions,
And... this 2-4 month lifetime is very altitude and latitude dependent.
We can run some sims with the AER 2D an look but my guess from what we have
done is that you could make choices that would push this up a bit.
David
From: geoengineering@googlegroups.com
The acid deposition problem may well carry less weigh than the contribution to
trop chemistry and air pollution.
D
From: geoengineering@googlegroups.com [mailto:geoengineering@googlegroups.com]
On Behalf Of Mike MacCracken
Sent: Monday, March 19, 2012 10:43 AM
To: Alan Robock
Cc: Stephen
Dear Mike,
The paper says:
There is a clear seasonal cycle in the e-folding lifetime of
the stratospheric aerosols in the Arctic case ranging from
2 to 4 months. The maximum lifetime occurs during boreal
summer with a minimum during boreal winter with the
formation of the polar vortex and
Doesn't lifetime depend massively on injection height particle size?
Size in turn depends on precursor, injection density, weather etc.
What is the latest thinking on the preferred precursor and injection
conditions? Acid mist, SO2 or H2S?
A
On Mar 19, 2012 4:43 PM, Mike MacCracken
Hi Alan—Well, my mistake—I thought I got the 2-month number from your paper
on this, but apparently not.
Mike
On 3/19/12 1:12 PM, Alan Robock rob...@envsci.rutgers.edu wrote:
Dear Mike,
The paper says:
There is a clear seasonal cycle in the e-folding lifetime of
the
Hi Nathan,
Thanks for that thoughtful posting. I am sorry you have the impression
that AMEG might be proposing cloud brightening as a silver bullet. We
obviously have a strong advocate of that particular method in Stephen
Salter, who is a member of the group. But Stephen recognises that we
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