date: Tue Oct 30 10:39:40 2007 from: Tim Osborn subject: Re: Questions about CRU CL 1.0 to: Ian Harris Harry -- I'm catching up on old emails including the one below from a month ago... the answer is "no" I don't know. Helpful aren't I?! Tim At 09:17 26/09/2007, you wrote: Hi Phil, Tim, Do either of you know the answers to these questions? Cheers Harry On 26 Sep 2007, at 8:48, Sheppard Sylv Miss ((SCI)) wrote: -----Original Message----- From: Jongschaap, Raymond [[1]mailto:raymond.jongschaap@wur.nl] Sent: Wednesday, September 26, 2007 8:16 AM To: Sheppard Sylv Miss (SCI) Cc: Jongschaap, Raymond; Conijn, Sjaak Subject: Questions about CRU CL 1.0 Dear Dr Mitchel, or CRU colleague, I would like to know if you could help me out with some questions concerning the CRU CL 1.0 data-set, that is available on your website. In the above database radiation (rad, W m-2) is provided, although in the paper of New et al. (1999), this variable is not mentioned. My questions are: 1) Where can I learn how this variable was derived, and 2) As Rad is given as W m-2 (or J m-2 s-1); is this an average value for a day in a given month? Does this apply for 24 hours, or for the daylength period only? As you may understand, I would like to obtain the daily or monthly value of rad, and don't know which mulitplier I should use. My last question is about vapour pressure (vap, hPa) and wind speed (wnd, m s-1) 3) Are these mean values for a day (24 h) in a given month or do they apply for the daylength period of that day only? I hope you can help me out ASAP with some (partial) answers, Best personal regards, Dr. ir. R.E.E. Jongschaap Sustainable farming systems, Bioenergy, Simulation modeling and Remote Sensing Wageningen University and Research centre Plant Sciences Group Plant Research International Dept. Agrosystems Innovations T +31 (0)317 475953 / [new: 480570] F +31 (0)317 423110 E raymond.jongschaap@wur.nl W [2]www.pri.wur.nl Postal address: P.O. Box 16 NL-6700AA Wageningen the Netherlands Visiting address: Bornsesteeg 65 Building 122, room 0.24 NL-6708PD Wageningen the Netherlands Jatropha curcas evaluation, breeding and propagation programme W [3]www.jatropha.wur.nl Ian "Harry" Harris Climatic Research Unit School of Environmental Sciences University of East Anglia Norwich NR4 7TJ United Kingdom