Publication Date:
2020-05-27
Description:
Here we show how the frequency scaling of a climate reconstruction from sediment proxy records
is affected by various sources of uncertainty. Specifically, analytic expressions are derived and
illustrated for the power spectral density of a climate reconstruction, based on a simple model that
takes into account: the spectral structure of the true climate, uneven recording throughout the year,
precession-like orbital modulations of the seasonal cycle, bioturbation, sampling of a finite number
of signal carriers from discontinuous slices of sediment material, uncorrelated measurement noise;
and that includes the effects of spectral aliasing and leakage. The basic behaviour and the properties
of the model are demonstrated, and the implications for the interpretation of climate reconstructions
are discussed.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Conference
,
notRev
