Tuesday, April 3, 2012

3121.txt

date: Tue, 15 Apr 2008 09:24:55 +0000
from: Gerard van der Schrier <schrieratXYZxyzi.nl>
subject: Re: CRU TS3.0
to: Keith Briffa <k.briffaatXYZxyz.ac.uk>

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Keith,

I've agreed with Ed that I do the PDSI calculations and do some
additional quality control tests. Harry will probably keep me updated
when he finds more problems with the data.

About the Int.J.Clim. paper: I've gone through the remarks you made and
which you send me. There are some issues the referees raised, like the
infilling of data, which are solved easily. We just have to put more
emphasis on the remark we made that infilling is only used for T, the
places where P is infilled are flagged as absent and not used in the
analysis. I expect that other points are (nearly) as easy.

About the Dai paper and other plans with PDSI: the idea is to see if the
self-calibrating PDSI is changed dramatically if Penman-Monteith is used
rather than Thornthwaite, and i'd like to see a comparison using a
complicated and the simple waterbalance model as well. We've discussed
this earlier and we don't expect any problems here simply due to the
calibrating which probably "adjusts" for any problems with potential
evapotranspiration. This should make one paper.

The next paper is a global dataset based on the updated CRU data - the
rework of Dai's paper. Now that we discuss this topic: I guess we may
have problems in regions like the Sahara or Siberia - any ideas yet? We
could wait and see how the scPDSI behaves, but is the PDSI a valid index
for these regions anyway?

Cheers, Gerard
> Gerard
> do you wish me to chase this up ? Also can you update me on the
> Int.J.Clim paper status. Are you considering a rework of the Dai
> global paper ? Cheers
> Keith
>
> At 08:38 14/04/2008, you wrote:
>> Hi Harry,
>>
>> Sorry to bother you again about the CRU updated data.
>>
>> Ed Cook and myself were wondering about the status of the CRU TS 3.0
>> data. Is it ready or not yet? We are slightly confused about the
>> status of this update.
>>
>> Some time ago, I received an ftp address for this data and I
>> downloaded the data (both Temp - tx, tg, tn- and Precip). But later,
>> I learned that CRU withdrew support for these data - so I stopped
>> working with these data.
>>
>> Can you tell me where (which continents or which time periods) you
>> suspect most in the dataset I downloaded? (downloaded it at the end
>> of September last year). Or would you advise me not to use the data
>> at all before there is a properly tested dataset?
>>
>> Cheers, Gerard
>>
>> --
>> ----------------------------------------------------------
>> Gerard van der Schrier
>> Royal Netherlands Meteorological Institute (KNMI)
>> dept. KS/KA
>> PO Box 201
>> 3730 AE De Bilt
>> The Netherlands
>> schrieratXYZxyzi.nl
>> +31-30-2206597
>> www.knmi.nl/~schrier
>> ----------------------------------------------------------
>
> --
> Professor Keith Briffa,
> Climatic Research Unit
> University of East Anglia
> Norwich, NR4 7TJ, U.K.
>
> Phone: +44-1603-593909
> Fax: +44-1603-507784
>
> http://www.cru.uea.ac.uk/cru/people/briffa/


--
----------------------------------------------------------
Gerard van der Schrier
Royal Netherlands Meteorological Institute (KNMI)
dept. KS/KA
PO Box 201
3730 AE De Bilt
The Netherlands
schrieratXYZxyzi.nl
+31-30-2206597
www.knmi.nl/~schrier
----------------------------------------------------------

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