Monday, April 30, 2012


date: Mon Jul 6 09:29:31 2009
from: Phil Jones <>
subject: Fwd: Re: Climate datasets

When you get back to the BADC work, you might want to look at the UDEL
web site. I don't think what Cort Willmott has done will make any difference.
You were only using their temperatures and not their precip. For the later you were
using GPCC data.

From: <willmottatXYZxyzl.Edu>
Subject: Fwd: Re: Climate datasets
To: Phil Jones <>
Cc: Elsa Nickl <enicklatXYZxyzl.Edu>, Kenji Matsuura <kenjisan@UDel.Edu>
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Dear Phil,
Kenji and I have now revised our land-surface monthly P dataset and placed the new
version (2.01) on our research Web site. We decided not to include GSOD data observed
prior to 1975 because of their many irregularities. However, since we observed fewer
irregularities within the GSOD archive after the mid-1970s and the more recent GSOD data
improved our spatial coverage, we elected to include many GSOD records observed since
1974. We did filter these station records and remove "unrealistic" observations,
however, as described in our revised documentation.
Hope you find these data useful -- Cort
---- Original message ----
>Date: Wed, 20 May 2009 14:29:09 -0400 (EDT)
>From: <willmottatXYZxyzl.Edu>
>Subject: Fwd: Re: Climate datasets
>To: Phil Jones <>
>Cc: Elsa Nickl <>, Kenji Matsuura <kenjisan@UDel.Edu>
>Dear Phil,
>Yes, I see the posting of our data on the JISAO site. There are several of our
datasets on the site, including our recently gridded air temperature and precipitation
datasets from 1900-2006. You are correct that we used both GHCN and GSOD station data
to estimate our gridded fields, although we only used GSOD data where there was no GHCN
record. Once we sort out the GSOD problems, I�ll be in touch.
>We also are looking over the GPCC data and I too lament the fact that they will not
release station data.
>More later -- Cort
>---- Original message ----
>>Date: Tue, 19 May 2009 13:52:24 +0100
>>From: Phil Jones <>
>>Subject: Re: Climate datasets
>>To: <willmottatXYZxyzl.Edu>
>> Cort,
>> The dataset we've been comparing with is this one.
>> [4] Just
>>noticed this is on the JISAO site!
>> This links back to the page you sent me.
>> I presume you've used GHCN and also GSOD data to derive the grids.
>> Thanks for telling us you'll be updating the data soon, but I doubt that
>> will make any difference at the scales we're doing the comparisons. It would
>> if we were comparing at much smaller scales. We're using the large Giorgi
>> regions that IPCC use. Not much use climatically but we've got numerous
>> other things to say in the paper.
>> We've not used GSOD, but am not surprised there are some problematic data.
>> For precip we've compared with the new GPCC dataset from 1901. I'd suggest
>> you get this, as it uses many more stations, so
>>should be better. Sadly, no-one
>> can get the station data from them. I suspect
>>it is just denser where it was already
>> quite dense.
>> Cheers
>> Phil
>>At 20:12 18/05/2009, you wrote:
>>>Dear Phil,
>>>Kenji asked me to reply to your recent
>>>e-mail. We are, of course, quite pleased that
>>>there is excellent agreement between your new
>>>high-resolution dataset and our data. In most
>>>cases, we too have found good agreement among our and CRU datasets.
>>>I am not sure which of our datasets you have
>>>examined in this instance but an example of how to cite one of our datasets is:
>>>Willmott, C. J. and K. Matsuura (2001)
>>>Terrestrial Air Temperature and Precipitation:
>>>Monthly and Annual Time Series (1950 - 1999),
>>>The creatorsâ namesmes, the title, and date of
>>>each dataset appear in the datasetâs
>>>documentation (the README filfile) on our Web site.
>>>Let me also mention that we have found some
>>>problems with a subset of the precipitation
>>>station data (the GSOD station data) that we
>>>used to create our most recent (1900-2006)
>>>gridded precipitation dataset. We are in the
>>>process of filtering the questionable GSOD
>>>station records and, as a consequence--if you
>>>are using this dataset, I encourage you to wait
>>>until we have created the revised version of our gridded dataset.
>>>Thank you for expressing an interest in our data
>>>and we hope this helps to clarify.
>>>Regards -- Cort
>>Prof. Phil Jones
>>Climatic Research Unit Telephone +44 (0) 1603 592090
>>School of Environmental Sciences Fax +44 (0) 1603 507784
>>University of East Anglia
>>Norwich Email
>>NR4 7TJ


Prof. Phil Jones
Climatic Research Unit Telephone +44 (0) 1603 592090
School of Environmental Sciences Fax +44 (0) 1603 507784
University of East Anglia
Norwich Email

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