cc: rabetts@meto.gov.uk
date: Fri, 02 Feb 2001 14:40:35 +0000 (GMT)
from: Simon Tett <sfbtett@meto.gov.uk>
to: Eduardo.Zorita@gkss.de


(CC'd to all and sundry for their thoughts!)

Hi Eduardo,
   sorry about the delay in responding. I've just moved jobs within
   the Hadley centre so have been a little snowed under. In a way your
   delay is good news! It means that it is still possible for us to do
   parallel experiments. Do you think that worth while?

   Tom Crowley is (I hope) merging together his volcanic forcing
   timeseries with that of Sato et al (I sent him some numbers..) to
   produce I hope a timeseries from at least 1500. When we last talked
   he thought he could use some Antarctic data to give "global" estimates.

   Ricahrd Betts, one of my colleagues, is sugesting that we use land
   surface changes for which he has got hold of a dataset. Is this
   something you wish to contemplate doing? 

   I am also contemplating taking account of (the relatively small)
   orbital changes in the experiments. Is this something you wish to
   contemplate doing as well?

Simon


>>>>> "Eduardo" == Eduardo Zorita <Eduardo.Zorita@gkss.de> writes:

Eduardo> Dear Simon,

Eduardo> sorry for my late answer, I have been out of town.

Eduardo> Actually we have not started that integration yet. We have had unexpected problems
Eduardo> to "adapt" the ECHAM4 fortran 77 version to the f90 compiler. This work is done
Eduardo> at the DKRZ in Cubasch group and
Eduardo> proved to be more complicated than previously thought. So, it was been decided to
Eduardo> develop a truly fortran 90 version of ECHAM4. This work is under way and 
Eduardo> the DKRZ schedule would be something like mid february.

Eduardo> For the forcing factors since year 1000 BP, we were planning to use the 
Eduardo> data contained in Crowly (Science, 270), especially what the estimates
Eduardo> of volcanic forcing are concerned. They are biased towards Northern Hemisphere
Eduardo> eruptions, but perhaps this is the best we can get at this moment.

Eduardo> Concerning solar variability, we had several options for the period 1000-1500,
Eduardo> in which the estimations deviate somewhat stronger. I would tend to take
Eduardo> the Be10 measurements from Bard et al Tellus B 52, 985 (2000).

Eduardo> But we are open to new suggestions, since your group has more experience
Eduardo> than ours.



-- 
Dr Simon Tett  Climate Research Scientist 
Met Office   Hadley Centre  Climate Prediction and Research
London Road   Bracknell    Berkshire   RG12 2SY   United Kingdom 
Tel: +44 (0)1344 856886   Fax: +44 (0)1344 854898 
E-mail: sfbtett@meto.gov.uk   http://www.metoffice.gov.uk 
