date: Thu, 25 Oct 2007 15:49:51 +0100
from: Ian Harris <i.harris@uea.ac.uk>
subject: Re: CRU TS 2.10 VAP & WET
to: P.Jones@uea.ac.uk

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Hi Phil,

Just to let you know, the problem is with the decadal files only. The  
full 1901-2002 files are apparently correct.

This is comparatively good news as I suspect most people don't bother  
with the decadal files.

As to what happened - I have no idea. When I found that the full  
files were OK I guessed that there was a 'decade maker' program, and  
that this was simply seeded with the wrong parameter names. But on  
examination, the data have also been scaled to suit the parameter:

FULL 1901-2002 FILE
Var  Year  Jan_min  Jan_max  Jan_ave  Feb_min  Feb_max  Feb_ave   
Mar_min  Mar_max  Mar_ave  Ann_min  Ann_max  Ann_ave
VAP  1981        0      322       82        0      324        
84        0      320       90        0      360      107
WET  1981        0     3100     1018        0     2800       
919        0     3100      980        0     3100      992

DECADAL 1981-1990 FILE
Var  Year  Jan_min  Jan_max  Jan_ave  Feb_min  Feb_max  Feb_ave   
Mar_min  Mar_max  Mar_ave  Ann_min  Ann_max  Ann_ave
VAP  1981        0      310      102        0      280        
92        0      310       98        0      310       99
WET  1981        0     3220      819        0     3240       
842        0     3200      903        0     3600     1071

I suspect this is just another mystery-never-to-be solved; I'll put  
with all the others. And get on with VAP.

Cheers

Harry
PS Congratulations on getting Broadband!

On 24 Oct 2007, at 19:51, P.Jones@uea.ac.uk wrote:

>
>  Harry,
>    Have just got Broadband at home working, so
>  you can tell Mike tomorrow!  In Newcastle tomorrow
>  and Friday - Colin also.
>    Looks convincing re the switch, so I guess you'll
>  just have to sort it somehow.
>
>    This would affect what Dimitrios did re PET
>  but you're going to recalculate anyway.
>
>    Sort it so you can finish version 3, then go back and
>  back sort version 2.10
>
>  Cheers
>  Phil
>
>
>> Phil,
>>
>> Preliminary investigations are indicating that the published 2.10
>> dataset has transposed the Vapour Pressure and Wet Day parameters.
>>
>> Examples so far are from January and February 1981.
>>
>> Month      Param        Min         Max
>> Jan 81     VAP            0         310
>> Jan 81     WET            0        3220
>> Feb 81     VAP            0         280
>> Feb 81     WET            0        3240
>>
>> I think the 310 and 280 values clinch it?
>>
>> This applies to both the original GRIM format files and to the ones I
>> reformatted as grids (that program did one var at a time so could not
>> have swapped them, I've checked anyway).
>>
>> Harry
>> Ian "Harry" Harris
>> Climatic Research Unit
>> School of Environmental Sciences
>> University of East Anglia
>> Norwich NR4 7TJ
>> United Kingdom
>>
>>
>>
>
>

Ian "Harry" Harris
Climatic Research Unit
School of Environmental Sciences
University of East Anglia
Norwich NR4 7TJ
United Kingdom


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