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
Caldeira; Andrew Lockley; Geoengineering;
j.e.kristjans...@geo.uio.no
Subject: Re: [geo] Source on SRM causing warming
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
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,
@googlegroups.com]
On Behalf Of Alan Robock
Sent: Monday, March 19, 2012 10:03 AM
To: mmacc...@comcast.net
Cc: Stephen Salter; Ken Caldeira; Andrew Lockley; Geoengineering;
j.e.kristjans...@geo.uio.no
Subject: Re: [geo] Source on SRM causing warming
Dear Mike,
I don't know how you do this 6 to 1 calculation
Salter; Ken Caldeira; Andrew Lockley; Geoengineering;
j.e.kristjans...@geo.uio.no
Subject: Re: [geo] Source on SRM causing warming
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
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
...@envsci.rutgers.edu
New Brunswick, NJ 08901-8551 USA http://envsci.rutgers.edu/~robock
On 3/19/2012 9:42 AM, Mike MacCracken wrote:
Re: [geo] Source on SRM causing warming Hi Alan—Well, I got the 2 months
number from your paper—and used that. Interesting that a more detailed
For clarity, I've never used or advocated this 10C figure, just explained
where I think it was from.
I don't think CCN manipulation in the arctic is expected. From what I
understand It's proposed that any local cooling will be at lower latitudes,
on water headed to the arctic.
It's been pointed
Mike
I had thought that the plan was stratospheric aerosol to be released at
low latitudes and would slowly migrate to the poles where is would
gracefully descend. If you can be sure that it will all have gone in 10
days then my concerns vanish. But if the air cannot get through the
water
: geoengineering@googlegroups.com [mailto:geoengineering@googlegroups.com]
On Behalf Of Stephen Salter
Sent: Sunday, March 18, 2012 10:52 AM
To: mmacc...@comcast.net
Cc: Ken Caldeira; Andrew Lockley; Geoengineering; j.e.kristjans...@geo.uio.no
Subject: Re: [geo] Source on SRM causing warming
Mike
I
Hi Stephen--My wording must have been confusing.
For stratospheric injections at low latitudes, the lifetime is 1-2 years.
The aerosols do move poleward and are carried into the troposphere in mid
and high latitudes. This is one approach to trying to limit global climate
change, and, as David
The Robock et al simulations of an Arctic injection found that the lifetime
of particles in the lower Arctic stratosphere was only two months. In that
one would only need particles up during the sunlit season (say three months,
for only really helps after the sea ice surface has melted and the sun
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