Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3304710b&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 4, CiteID L04710
Physics
5
Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Global Climate Models (1626, 4928), Paleoceanography: Ice Cores (0724)
Scientific paper
The low frequency variability of the near surface temperature in a climate simulation is compared with Greenland ice core δ18O time series during the holocene. The simulation is performed with the coupled CSIRO atmosphere-ocean model under present-day conditions. The variability, analyzed by the detrended fluctuation analysis, reveals power-law scaling of the power-spectrum for frequency f, S(f) ~ f-β, and long term memory (LTM) given by β > 0. The near surface temperature shows intense LTM in the North Atlantic south of Greenland, weak LTM in parts of the Antarctic ocean and the tropical Atlantic, and no LTM in the Pacific ocean. The power-law exponent β ~ 0.5 near Greenland agrees with ice core temperature proxies up to time scales of 1000 years. The LTM of the surface temperature is explained by the high low frequency variability of the zonally averaged stream-function in the Atlantic with maxima in the Arctic ocean.
Blender Richard
Fraedrich Klaus
Hunt Barrie
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