cc: Phil Jones <p.jonesatXYZxyz.ac.uk>, dave lister <d.listeratXYZxyz.ac.uk>
date: Tue, 8 Jan 2008 15:41:45 +0000
from: Ian Harris <i.harrisatXYZxyz.ac.uk>
subject: Re: CRU_TS_2.1 etc
to: Martin Juckes <m.n.juckesatXYZxyzac.uk>
I've had a look at the data area you identified. Those temperatures
are definitely unrealistic, of course.
However, the new (yet-to-be-released) version 3.0 of the dataset does
not feature such excessions - at least, as far as I can determine.
For instance, for the (568, 240) Dec 95 datum:
CRU TS 2.10 = 68.6
CRU TS 3.00 = 9.4
For that decade (1991-2000), the range is now -54.6 to 39.2. A much
more convincing story, I hope you'll agree.
If I had to hazard a guess as to the source of these apparent errors,
I would first turn to the source observed dataset. This has been
extensively cleaned, QA'd and enhanced since 2002.
On 14 Dec 2007, at 10:44, Martin Juckes wrote:
> Hello Ian,
> I've been looking at the data in cru_ts_2_10.1901-2002.tmp, and I
> think there
> are some unrealistic high temperatures.
> There is a temperature of 68.6 deg. Celsius in Dec. 1995,
> grid reference 568, 240. There are 2 other points over 60 deg C in
> that month,
> also one at 47.2.
> I'm pretty sure that 68 is not a plausible monthly mean, but what
> about 47?
> Temperatures of this order crop up in several years.
> On Friday 16 March 2007 10:42, you wrote:
>> Hi Martin,
>> On 16 Mar 2007, at 9:48, Martin Juckes wrote:
>>> Hello Ian,
>>> I've just been talking to Phil Jones, who tells me you are now
>>> responsible for
>>> CRU_TS_1.0 and CRU_TS_2.1. We'd like to use both datasets for the
>>> IPCC Data
>>> Distribution Centre. The current site uses data which we believe is
>>> from CRU_TS_1.0, but the documentation trail is patchy -- so we'd
>>> like the
>>> original data. We'd also like to use the updated data. Phil said
>>> this will
>>> soon be superceded by a new dataset which will be held here at
>>> BADC, but it
>>> would be good to have CRU_TS_2.1 in the meantime,
>> CRU TS 2.10 is now available - please follow the usual data set route
>> through the CRU website, let me know if you have problems.
>> CRU TS 1.0 is temporarily here:
>> Please give me a shout when you've got it!
>> 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