cc: t.osborn@uea.ac.uk date: Mon, 7 Sep 2009 00:13:56 +0100 (BST) from: "Tim Osborn" subject: New Zealand summer temps to: p.jones@uea.ac.uk Hi Phil, just a quick Q before I go to bed! I've just updated the IPCC paleo chapter Southern Hemisphere plot where we showed, amongst other things, Ed Cook's New Zealand TRW reconstruction, with CRUTEM2v Jan-Mar smoothed temperatures. For my update I've used CRUTEM3v, expecting them to be rather similar but with a few more years on the end. But the pre-1930 temperatures are now very different, being much cooler (by > 0.5 degC for a 25-year low-pass mean) in CRUTEM3v than CRUTEM2v. Previously they had been, on average, near or even above the 1961-1990 mean, now they're at -0.5 degC. Is this a result of some homogenization work on New Zealand summer temp data? Or just some random artefact of minor changes somewhere? Cheers Tim -- Dr. Tim Osborn RCUK Academic Fellow Climatic Research Unit School of Environmental Sciences University of East Anglia Norwich NR4 7TJ, UK www.cru.uea.ac.uk/~timo/