date: Wed Feb 18 16:06:23 2004 from: Keith Briffa subject: Fwd: 2004GL019658 Request to Review from Geophysical Research to: t.osborn@uea.ac.uk IN CONFIDENCE Tim do you fancy this? I have 3 others at present? Should I do it anyway given the EBM component!!!! Keith X-Mailer: MIME::Lite 2.106 (B2.11; Q2.03) Date: Wed, 18 Feb 2004 14:54:40 UT To: K.Briffa@uea.ac.uk Subject: 2004GL019658 Request to Review from Geophysical Research Letters From: grlonline@agu.org Reply-To: kjohnson@agu.org Dear Dr. Briffa: Would you be willing and available to review "Are Reconstructed Pre-Instrumental Hemispheric Temperatures Consistent With Hemispheric Instrumental Temperatures?" by Natalia Andronova, Michael Schlesinger, Michael Mann, submitted for possible publication in the Geophysical Research Letters. The manuscript's abstract is: Reconstructions of Northern Hemisphere near-surface temperatures from climate 'proxy' data such as tree rings, ice cores, and corals, suggest that late 20th century Northern Hemisphere mean warmth is anomalous in the context of the past centuries and likely at least the past two millennia. Though substantial uncertainties in the paleoclimate reconstructions exist, these findings add to the evidence for a discernible human influence on climate. Here we use our simple climate model with six radiative-forcing reconstructions and climate sensitivity determined from instrumental temperatures over 1861 to 1997 to simulate the forced pre-instrumental hemispheric-average temperatures from 1500 to 1860. The model-simulated pre-instrumental temperatures indicate that the proxy temperature reconstructions are consistent with the instrumental temperatures in the Northern Hemisphere, but are too warm in the Southern Hemisphere. Lowering the pre-instrumental temperatures in the Southern Hemisphere by about 0.2oC would thus further strengthen the case for human-induced warming during the 20th century. If you agree to review this manuscript, I would ask for your comments within 14 days from your acceptance. To ACCEPT, click on the link below: <[1]http://grl-submit.agu.org/cgi-bin/main.plex?el=A2K2txh2A2mTr5D7A97i67h6WflH7b8om46g7 cQZ> If you are unable to review this manuscript at this time, I would appreciate any suggestions of other potential reviewers who would be qualified to examine this manuscript. (Via reply e-mail.) To DECLINE, click on the link below: <[2]http://grl-submit.agu.org/cgi-bin/main.plex?el=A7K2txh6A5mTr5E7A97i67h6WflH7b8om46g7 cQZ> If you have any questions or need more information feel free to reply to this e-mail. Thank you for your consideration and support of Geophysical Research Letters. Sincerely, Saburo Miyahara Associate Editor Geophysical Research Letters -- Professor Keith Briffa, Climatic Research Unit University of East Anglia Norwich, NR4 7TJ, U.K. Phone: +44-1603-593909 Fax: +44-1603-507784 [3]http://www.cru.uea.ac.uk/cru/people/briffa[4]/