Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30sclm3h&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 19, pp. CLM 3-1, CiteID 2011, DOI 10.1029/2003GL017875
Physics
11
Oceanography: General: Paleoceanography, Meteorology And Atmospheric Dynamics: Paleoclimatology, Oceanography: General: Climate And Interannual Variability (3309)
Scientific paper
Precession of the equinoxes has no effect on the mean annual insolation, but does modulate the amplitude of the seasonal cycle. In a linear climate system, there would be no energy near the 21,000 year precession period. It is only when a non-linear mechanism rectifies the seasonal modulation that precession-period variability appears. Such rectification can arise from physical processes within the climate system, for example a dependence of ice cover only on summer maximum insolation. The possibility exists, however, that the seasonality inherent in many climate proxies will produce precession-period variability in the records independent of any precession-period variability in the climate. One must distinguish this instrumental effect from true climate responses. Careful examination of regions without seasonal cycles, for example the abyssal ocean, and the use of proxies with different seasonal responses, might permit separation of physical from instrumental effects.
Huybers Peter
Wunsch Carl
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