date: Tue May 17 15:33:15 2005 from: Tim Osborn subject: Re: Nature Review Request - manuscript 2005-05-05186 to: m.hutchinson@nature.com Since the author, Nathan Gillett, is a close colleague of mine (just a couple of offices down the corridor), I don't think it would be appropriate for me to review this manuscript. Regards Tim At 14:44 16/05/2005, you wrote: Dear Dr Osborn I was wondering whether you would be willing to review a short manuscript for the Brief Communications section of Nature. The manuscript comes from Nathan Gillettand is entitled "Inconsistency between simulated and observed Northern Hemisphere circulation changes". Its first paragraph is pasted below. Is this a paper that you would be able to review for us within 14 days? If so, please let me know as soon as possible, and I will send instructions to you on how to access the manuscript. Failing that, it would be helpful to us if you could suggest alternative referees. Many thanks in advance for your help and I look forward to hearing from you. Yours sincerely Rosalind Cotter Editor, Brief Communications Inconsistency between simulated and observed Northern Hemisphere circulation changes Nathan Gillett In recent decades winter sea level pressure has decreased over the Arctic and increased in the Northern Hemisphere subtropics, a change associated with 50% of the observed Eurasian winter warming over the past thirty years, 60% of the rainfall increase in Scotland, and 60% of the rainfall decrease in Spain. This trend has previously been shown to be inconsistent with the simulated response to greenhouse gas and sulphate aerosol changes, but other climate influences such as ozone depletion have been suggested as a possible reason for the discrepancy. Here, for the first time, we compare observed Northern Hemisphere sea level pressure trends with those simulated in response to all the major human and natural climate influences in eight state-of-the-art coupled climate models over the past 50 years, and find that the observed trend is inconsistent both with simulated internal variability and with the simulated response to combined human and natural climate influences. Please note that your contact details are being held on our editorial database which is used only for this journal's management of the peer review process. If you would prefer us not to contact you in the future please let us know by emailing nature@nature.com. This email has been sent through the NPG Manuscript Tracking System NY-610A-NPG&MTS