Past dynamics of the Australian monsoon: precession, phase and links to the global monsoon concept

被引:40
作者
Beaufort, L. [1 ]
van der Kaars, S. [2 ,3 ]
Bassinot, F. C. [4 ]
Moron, V. [1 ,5 ]
机构
[1] Univ Aix Marseille, CNRS, CEREGE, Aix En Provence, France
[2] Monash Univ, Sch Geog & Environm Sci, Ctr Palynol & Palacoccol, Clayton, Vic 3800, Australia
[3] Univ Amsterdam, Inst Biodivers & Ecosyst Dynam, NL-1098 XH Amsterdam, Netherlands
[4] CEA, CNRS, LSCE, F-91198 Gif Sur Yvette, France
[5] Columbia Univ, IRI, New York, NY USA
基金
澳大利亚研究理事会;
关键词
EL-NINO/SOUTHERN-OSCILLATION; EARTHS ORBITAL PARAMETERS; SOUTHERN-OSCILLATION; CLIMATIC-CHANGE; POLLEN RECORD; ASIAN MONSOON; NINO; VARIABILITY; HOLOCENE; EASTERN;
D O I
10.5194/cp-6-695-2010
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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 Nino 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.
引用
收藏
页码:695 / 706
页数:12
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