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| Titel |
A mechanism for dust-induced destabilization of glacial climates |
| VerfasserIn |
B. F. Farrell, D. S. Abbot |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 6 ; Nr. 8, no. 6 (2012-12-18), S.2061-2067 |
| Datensatznummer |
250005987
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| Publikation (Nr.) |
 copernicus.org/cp-8-2061-2012.pdf |
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| Zusammenfassung |
| Abrupt transitions between cold/dry stadial and warm/wet
interstadial states occurred during glacial periods in the absence
of any known external forcing. The climate record preserved in
polar glaciers, mountain glaciers, and widespread cave deposits
reveals that these events were global in extent with temporal
distribution implying an underlying memoryless process with
millennial time scale. Here a theory is advanced implicating
feedback between atmospheric dust and the hydrological cycle in
producing these abrupt transitions. Calculations are performed
using a radiative-convective model that includes the interaction of
aerosols with radiation to reveal the mechanism of this
dust/precipitation interaction feedback process and a Langevin
equation is used to illustrate glacial climate
destabilization by this mechanism. This theory explains the observed
abrupt, bimodal, and memoryless nature of these transitions as well
as their intrinsic connection with the hydrological cycle. |
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