Physics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2205k&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 11, p. 2205-2208
Physics
7
Global Change, Global Change: Atmosphere, Global Change: Climate Dynamics
Scientific paper
Several simple indices of surface air temperature patterns are used to describe global climate variability and change. The indices include the land-ocean temperature contrast, the hemispheric contrast, the meridional gradient, and the magnitude of the seasonal cycle, as well as the global-mean temperature. The behavior of the indices is investigated using global observational data for the period 1881-1994 and long control and anthropogenic climate change simulations with two different climate models. The indices represent the key features of the ``fingerprint'' of greenhouse climate change. For natural climate variations, they contain information independent of the global-mean temperature. The observed trends over the last 40 years in all the indices, except for the hemispheric contrast, are unlikely to have occurred due to natural climate variations and all are consistent with model simulations of anthropogenic climate change.
Braganza Karl
Karoly David J.
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