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| Titel |
Past dynamics of the Australian monsoon: precession, phase and links to the global monsoon concept |
| VerfasserIn |
L. Beaufort, S. Kaars, F. C. Bassinot, V. Moron |
| 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 ; 6, no. 5 ; Nr. 6, no. 5 (2010-10-22), S.695-706 |
| Datensatznummer |
250003762
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| Publikation (Nr.) |
 copernicus.org/cp-6-695-2010.pdf |
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| Zusammenfassung |
| Past variations in the dynamics of the Australian monsoon have been
estimated from multi-proxy analysis of a core retrieved in the Eastern Banda
Sea. Records of coccolith and pollen assemblages, spanning the last 150 000
years, allow reconstruction of past primary production in the Banda Sea,
summer moisture availability, and the length of the dry season in northern
Australia and southeastern Indonesia. The amount of moisture available
during the summer monsoon follows typical glacial/interglacial dynamics with
a broad asymmetrical 100-kyr cycle. Primary production and length of the dry
season appear to be closely related, given that they follow the precessional
cycle with the same phase. This indicates their independence from ice-volume
variations. The present inter-annual variability of both parameters is
related to El Niño Southern Oscillation (ENSO), which modulates the
Australian Winter Monsoon (AWM). The precessional pattern observed in the
past dynamics of the AWM is found in ENSO and monsoon records of other
regions. A marked shift in the monsoon intensity occurring during the mid
Holocene during a period of constant ice volume, suggests that low latitude
climatic variation precedes increases in global ice volume. This
precessional pattern suggests that a common forcing mechanism underlies low
latitude climate dynamics, acting specifically and synchronously on the
different monsoon systems. |
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