cc: Phil Jones , dave lister date: Tue, 8 Jan 2008 15:41:45 +0000 from: Ian Harris subject: Re: CRU_TS_2.1 etc to: Martin Juckes Hi Martin, 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. Cheers Harry 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. > > cheers, > Martin > > 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 >>> derived >>> 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 soon be superceded by a new dataset which will be held here at 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: >> >> http://www.cru.uea.ac.uk/~harry/for_martinjukes/ >> >> Please give me a shout when you've got it! >> >> Cheers >> >> 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