date: Thu, 04 Sep 2003 08:27:02 -0600 from: Caspar Ammann subject: Re: AGU session submission to: Tim Osborn Tim, it seems to work now. Give it a shot. Caspar Tim Osborn wrote: > Dear Caspar, > > I have been trying for the past few hours to submit an abstract to the > session that you're convening at the AGU Fall meeting. I've not > managed to complete the process because their system is currently > failing at the preview stage. It says to try again, which I will do, > but because the official deadline is about to pass, I thought I'd > email you my abstract just so that you know it is on the way (assuming > the deadline is extended past when the system is fixed!). > > Best regards > > Tim > > --------------------------------------------------- > Simulated and Observed Climate Signals in Borehole Temperature Profiles > > Tim Osborn > Keith Briffa > > Climatic Research Unit, School of Environmental Sciences, University > of East Anglia, Norwich NR4 7TJ, UK > > Simon Tett > > Hadley Centre - Reading, Meteorology Building, University of Reading, > Reading, Berkshire RG6 6BB, UK > > > Forward simulation of borehole temperature profiles are presented, > using ground (soil) temperature variations simulated by the HadCM3 > climate model forced by natural and anthropogenic factors from AD 1500 > to 2000. Differences between soil temperature and air temperature > variations are assessed, in terms of the driving influence of snow > cover and vegetation cover changes, and in terms of their impact on > the simulated borehole temperature profiles. The simulated profiles > are then compared with observed temperature profile anomalies. > > The sensitivity of air temperature reconstructions to method of > gridding the individual borehole records and to the profile sampling > date will be demonstrated by analysis of the climate signal in the > observed temperature profile data set. Comparison of the spatial > signature of twentieth century borehole-derived trends with > instrumental air temperature trends is used to assess confidence in > the climate signal recoverable from the borehole data set. > ----------------------------------------------- > > > Dr Timothy J Osborn > Climatic Research Unit > School of Environmental Sciences, University of East Anglia > Norwich NR4 7TJ, UK > > e-mail: t.osborn@uea.ac.uk > phone: +44 1603 592089 > fax: +44 1603 507784 > web: http://www.cru.uea.ac.uk/~timo/ > sunclock: http://www.cru.uea.ac.uk/~timo/sunclock.htm > > > -- Caspar M. Ammann National Center for Atmospheric Research Climate and Global Dynamics Division - Paleoclimatology Advanced Study Program 1850 Table Mesa Drive Boulder, CO 80307-3000 email: ammann@ucar.edu tel: 303-497-1705 fax: 303-497-1348