Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmpp43b1535l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #PP43B-1535
Astronomy and Astrophysics
Astronomy
1616 Climate Variability (1635, 3305, 3309, 4215, 4513), 4227 Diurnal, Seasonal, And Annual Cycles (0438), 4910 Astronomical Forcing, 4938 Interhemispheric Phasing, 4946 Milankovitch Theory
Scientific paper
On long time scales, changes in insolation are one main driver for climate variability. However, the question how insolation forcing is transferred into the climate system is largely unknown. Here, we propose the new concept that the climate response on astronomical time scales can be approximated by the local climate response to local seasonal insolation. Therefore we globally estimate empirical transfer functions between the observed daily temperature and the daily insolation and apply the transfer function on the long-term insolation. The concept is validated using a transient coupled climate model simulation for the Holocene. Further the temperature evolution of the last 750ky, predicted by our approach is analyzed and compared to proxy datasets. Our model predicts significant amplitudes in the eccentricity and semi-precession frequency band in the tropics caused by nonlinear responses which are already present in the seasonal cycle. Mid-latitudes are dominated by precession, high latitudes by obliquity. Further, it is found that the expected frequency response and the phasing highly depend on the location. Our local time-independent approach complements the global Milankovitch hypothesis (climate variations are driven by 65°N summer insolation) in explaining observed climate variability and offers new insights in interpreting paleoclimate records.
Laepple Thomas
Lohmann Gerrit
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