date: Wed, 02 Feb 2005 13:57:53 +0000 from: "Folland, Chris" subject: MANN TEMPERATURE CURVE to: k.briffa@uea.ac.uk Dear Keith John Houghton is writing a review chapter on Global Warming for Reviews in Physics. He has asked me to help with the observed climate change section soon. He currently has the Mann (1999) curve in his draft just like IPCC 2001 without reference to the von Storch et al paper which of course Simon Tett was an author and which looks convincing to me in deducing that variance is underestimated in Mann (1999). The Mann and Jones paper is more recent and has longer time series series but has the same perceived problems. How is your IPCC chapter dealing with this? What do you think is John Houghton's best approach to the pre-instrumental period back to 1000 or 200AD for hemispheric/global temperature? Any help/advice would be most gratefully received Best wishes Chris Professor Chris Folland Head of Climate Variability Research Global climate data sets are available from [1]http://www.hadobs.org Met Office, Hadley Centre, Fitzroy Rd, Exeter, Devon, EX1 3PB United Kingdom Email: chris.folland@metoffice.gov.uk Tel: +44 (0)1392 886646 Fax: (in UK) 0870 900 5050 (International) +44 (0)113 336 1072) [2]http://www.metoffice.gov.uk Also: Hon. Professor of School of Environmental Sciences, University of East Anglia