Tuesday, March 27, 2012

2892.txt

cc: Alex Wright <alex.wrightatXYZxyzw.vu.nl>, Orson van de PLassche <Orson.van.de.Plassche@falw.vu.nl>, Keith Briffa <k.briffaatXYZxyz.ac.uk>, jason.loweatXYZxyzoffice.gov.uk
date: Wed, 28 Jun 2006 22:20:47 +0100
from: Jonathan Gregory <j.m.gregoryatXYZxyzding.ac.uk>
subject: Re: Simulation data, missing 1900 trend?
to: Tim Osborn <t.osbornatXYZxyz.ac.uk>

Dear Tim and Alex

> Little increase is simulated south of 60S
This is generally the case in models, and we think in HadCM3 it is mainly
because thermal expansivity is low at cold temperatures.

> due to either (i) regional sulphate aerosol cooling; or
> (ii) internal variations of the ocean circulation
(ii) is more likely than (i) but it also depends on where the heat is taken up
and stored in the ocean.

> Such is the difficulty of interpreting *regional* sea level changes
Yes. Given that regional changes from models tend to disagree, comparing any
given place with the global mean is reasonable. However the local changes may
give an indication of the multidecadal variability you might expect to see.

Best wishes

Jonathan

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