Rectification and Precession-Period Signals in the Climate System
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CitationHuybers, Peter J., and Carl Wunsch. 2003. Rectification and precession-period signals in the climate system. Geophysical Research Letters 30(19).
AbstractPrecession 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.
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