Sunday, December 18, 2011


From: Jonathan Overpeck <>
To: Stefan Rahmstorf <>
Subject: Re: [Wg1-ar4-ch06] Follow-up from Christchurch
Date: Mon, 19 Dec 2005 21:32:37 -0700

Hi Stefan and team - great. David Rind is getting the solar forcing
series de jour (latest Lean). I expect Keith back on line soon, and
then he can help us figure out what type of simulation(s) we'd like,
and what other forcings we ought to use. My take is that it would be
good to use the same forcing used in the runs currently in Fig 6.10
(or at least the "best" of those runs - subjective, I'm sure, and all
with the old larger amplitude Lean solar), but with the new reduced
amplitude forcing.

Fig 6.10 currently has the Bauer et al, 2003 run w/ CLIMBER - is it
CLIMBER2? Could/should we just re-run with the new solar in place of
the old solar (I don't have the paper here - was the solar used
scaled to Lean?).

I'll cc this to the entire team, as there might be other ideas on how
to do this - I think we would want two simulations over the last 400
years. One w/ the old Lean solar, one with the new. If we could use
one of the existing plotted runs as the "old Lean" run, then we only
need one new run. The idea is to show what difference TAR solar (old
Lean) vs. AR4 solar (new Lean) means.

So, lets see what Keith and others say, and then line things up to
get the run done. If we can do it w/ CLIMBER, great. If we need to
involve another EMIC (assuming we're not going to get a AOGCM run
done in less than a month), then we need to line that up. Whatever
model we use, it should be one already in use by the AR4, so we don't
have to worry about the results being published - just the model.
Make sense?

Thanks again for the quick reply. Best, Peck

>Dear Jonathan,
>concerning item 8: we can deliver a millennium simulation with any
>given forcing provided to us within days. (Actually takes just about
>1 hour to run on the computer with CLIMBER-2.)

Jonathan T. Overpeck
Director, Institute for the Study of Planet Earth
Professor, Department of Geosciences
Professor, Department of Atmospheric Sciences

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