date: Fri, 27 May 2005 15:40:13 +0100
from: "Tett, Simon" <simon.tett@metoffice.gov.uk>
subject: Paper
to: t.osborn@uea.ac.uk

Tim,
	Hi thanks very much. Quite interesting and I am happy to be a
co-author. I think I would like to see a complete draft before making
more comments though!

Main comment -- can you be more quantitative i.e. use control data to
compute uncertainties and then compare models with each other and the
obs.

I will write some text for the model description (I need to do it for
Jason as well).

The CET record is not good early on. I am not sure how to quantify this.
Note that David Parker has a paper on uncertainty in CET. Models also
likely to underestimate grid point var. 

I suspect the air temperature data is very poor nth of 70N and sth of
45S. Any way of including this in your analysis?

Page 6, para 2. Note in HadCM3 there are quite strong changes in NH land
snow cover due to trees being chopped down...

I don't think solar var in ECHO-G is much greater than in HadCM3 -- see
my last tech report.

For your 50-year filter what are you doing for your last 25 years?
(Mann, 2004 has some ideas).

Simon


Dr Simon Tett  Managing Scientist, Data development and applications.
Met Office       Hadley Centre (Reading Unit)
Meteorology Building,  University of Reading, Reading RG6 6BB
Tel: +44 (0)118 378 5614  Fax +44 (0)118 378 5615
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E-mail: simon.tett@metoffice.gov.uk   http://www.metoffice.gov.uk
Global climate data sets are available from http://www.hadobs.org
