cc: "peter.thorne" <peter.thorne@metoffice.gov.uk>, Phil Jones <p.jones@uea.ac.uk>, Dick Dee <dick.dee@ecmwf.int>
date: Fri, 13 Mar 2009 17:42:56 +0000
from: Adrian Simmons <Adrian.Simmons@ecmwf.int>
subject: Re: ERA Analysis
to: Kate Willett <Kate.Willett@metoffice.gov.uk>

Dear Kate

I've no problem at all with you discussing this with Steve Sherwood. The
latest version is attached. You can see I've a first version of the
introductory sections, the discussions of temperature, and about a third
of the discussion on the humidity results.

Compared with earlier:

(i) I've dropped the remark in the abstract about the ERA-Interim
background being clearly better than ERA-40 for temperature. The only
thing clear when I looked at it in more detail was that I had made a
programming error.

(ii) I've followed advice in an earlier email from Phil, and switched
from CRUTEM3v to CRUTEM3. There are a few extra grid boxes with
meaningful values  in CRUTEM3, and it fits ERA slightly better than
CRUTEM3v. I also added a table with some least-squares-fit linear trends
- I'm not a fan of linear fits in general, but it seemed a convenient
way of summarising things.

(iii) I've put in some figures in Table 5 which show some correlations
(all positive, though not too exciting) between the humidity and
precipitation time series.

(iv) I've a plot (Figure 11) of the number of gauges entering the GPCC
analysis.

But the later stuff may change when I get round to writing the text.

I'm open to comments on the text that is already there, though you might
be better to wait until a complete draft is available, as I'm likely to
go back and change a few things in any case when I get to the end.

Best regards

Adrian


Kate Willett wrote:
> Hi Adrian,
> 
> We have Steve Sherwood visiting us next week to work with us on some
> heat-stress work and radiosonde data. We thought his input might be
> interesting/useful on the ERA analysis, especially in terms of the
> apparent drop in RH. We'd make it clear that this is work to be
> published soon. How do you feel about this? If you think it might be
> useful and are happy for us to do this then please could you email a
> copy of the most recent version to date. I understand if you'd rather we
> hold back though.
> 
> Getting a bit snowed under at the moment so I won't have chance to do
> anymore to HadCRUH for a week or so but its still on my list.
> 
> Kate 

-- 
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Adrian Simmons
European Centre for Medium-Range Weather Forecasts
Shinfield Park, Reading, RG2 9AX, UK
Phone: +44 118 949 9700
Fax:   +44 118 986 9450
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