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| Titel |
A simple conceptual model to interpret the 100 000 years dynamics of paleo-climate records |
| VerfasserIn |
C. S. Quiroga Lombard, P. Balenzuela, H. Braun, D. R. Chialvo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 17, no. 5 ; Nr. 17, no. 5 (2010-10-13), S.585-592 |
| Datensatznummer |
250013735
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| Publikation (Nr.) |
 copernicus.org/npg-17-585-2010.pdf |
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| Zusammenfassung |
| Spectral analyses performed on records of cosmogenic nuclides reveal a group
of dominant spectral components during the Holocene period. Only a few of
them are related to known solar cycles, i.e., the De Vries/Suess, Gleissberg
and Hallstatt cycles. The origin of the others remains uncertain. On the
other hand, time series of North Atlantic atmospheric/sea surface
temperatures during the last ice age display the existence of repeated
large-scale warming events, called Dansgaard-Oeschger (DO) events, spaced
around multiples of 1470 years. The De Vries/Suess and Gleissberg cycles
with periods close to 1470/7 (~210) and 1470/17 (~86.5) years
have been proposed to explain these observations. In this work we found that
a conceptual bistable model forced with the De Vries/Suess and Gleissberg
cycles plus noise displays a group of dominant frequencies similar to those
obtained in the Fourier spectra from paleo-climate during the Holocene.
Moreover, we show that simply changing the noise amplitude in the model we
obtain similar power spectra to those corresponding to GISP2 δ18O
(Greenland Ice Sheet Project 2) during the last ice age. These results give a
general dynamical framework which allows us to interpret the main
characteristic of paleoclimate records from the last 100 000 years. |
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