HR: 11:20h
AN: PP51D-05    [PDF]
TI: Simulated and Observed Climate Signals in Borehole Temperature Profiles
AU: * Osborn, T J
EM: t.osborn@uea.ac.uk
AF: Climatic Research Unit, School of Environmental Sciences University of East Anglia, Norwich, NR 4 7TJ United Kingdom
AU: Briffa, K R
EM: k.briffa@uea.ac.uk
AF: Climatic Research Unit, School of Environmental Sciences University of East Anglia, Norwich, NR 4 7TJ United Kingdom
AU: Tett, S F
EM: simon.tett@metoffice.com
AF: Hadley Centre - Reading, Meteorology Building University of Reading, Reading, RG6 6BB United Kingdom
AB: 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.
UR: http://www.cru.uea.ac.uk/cru/projects/soap/
DE: 1600 GLOBAL CHANGE (New category)
DE: 3309 Climatology (1620)
DE: 3337 Numerical modeling and data assimilation
DE: 3344 Paleoclimatology
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2003 Fall Meeting