Glacial to Holocene swings of the Australian-Indonesian monsoon
Mohtadi, M.; Oppo, D.W.; Steinke, S.; Stuut, J.B.W.; De Pol-Holz, R.; Hebbeln, D.; Lückge, A.; Stuut, J.B.W.; De-Pol-Holz, R. (2011). Glacial to Holocene swings of the Australian-Indonesian monsoon. Nature Geoscience 4(8): 540-544. dx.doi.org/10.1038/NGEO1209 In: Nature Geoscience. Nature Publishing Group: London. ISSN 1752-0894; e-ISSN 1752-0908, more |  |
| Authors | | Top | - Mohtadi, M.
- Oppo, D.W.
- Steinke, S.
| - Stuut, J.B.W.
- De Pol-Holz, R.
- Hebbeln, D., more
| - Lückge, A.
- Stuut, J.B.W., more
- De-Pol-Holz, R.
|
| Abstract | The Australian-Indonesian monsoon is an important component of the climate system in the tropical Indo-Pacific region(1). However, its past variability, relation with northern and southern high-latitude climate and connection to the other Asian monsoon systems are poorly understood. Here we present high-resolution records of monsoon-controlled austral winter upwelling during the past 22,000 years, based on planktic foraminiferal oxygen isotopes and faunal composition in a sedimentary archive collected offshore southern Java. We show that glacial-interglacial variations in the Australian-Indonesian winter monsoon were in phase with the Indian summer monsoon system, consistent with their modern linkage through cross-equatorial surface winds. Likewise, millennial-scale variability of upwelling shares similar sign and timing with upwelling variability in the Arabian Sea. On the basis of element composition and grain-size distribution as precipitation-sensitive proxies in the same archive, we infer that (austral) summer monsoon rainfall was highest during the Bolling-Allerod period and the past 2,500 years. Our results indicate drier conditions during Heinrich Stadial 1 due to a southward shift of summer rainfall and a relatively weak Hadley cell south of the Equator. We suggest that the Australian-Indonesian summer and winter monsoon variability were closely linked to summer insolation and abrupt climate changes in the northern hemisphere. |
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