Palaeoenvironmental change in tropical Australasia over the last 30,000 years - a synthesis by the OZ-INTIMATE group

Reeves, Jessica M., Bostock, Helen C., Ayliffe, Linda K., Barrows, Timothy T., De Deckker, Patrick, Devriendt, Laurent S., Dunbar, Gavin B., Drysdale, Russell N., Fitzsimmons, Kathryn E., Gagan, Michael K., Griffiths, Michael L., Haberle, Simon G., Jansen, John D., Krause, Claire, Lewis, Stephen, McGregor, Helen V., Mooney, Scott D., Moss, Patrick, Nanson, Gerald C., Purcell, Anthony and van der Kaars, Sander (2013) Palaeoenvironmental change in tropical Australasia over the last 30,000 years - a synthesis by the OZ-INTIMATE group. Quaternary Science Reviews, 74 97-114. doi:10.1016/j.quascirev.2012.11.027


Author Reeves, Jessica M.
Bostock, Helen C.
Ayliffe, Linda K.
Barrows, Timothy T.
De Deckker, Patrick
Devriendt, Laurent S.
Dunbar, Gavin B.
Drysdale, Russell N.
Fitzsimmons, Kathryn E.
Gagan, Michael K.
Griffiths, Michael L.
Haberle, Simon G.
Jansen, John D.
Krause, Claire
Lewis, Stephen
McGregor, Helen V.
Mooney, Scott D.
Moss, Patrick
Nanson, Gerald C.
Purcell, Anthony
van der Kaars, Sander
Title Palaeoenvironmental change in tropical Australasia over the last 30,000 years - a synthesis by the OZ-INTIMATE group
Journal name Quaternary Science Reviews   Check publisher's open access policy
ISSN 0277-3791
1873-457X
Publication date 2013-08-15
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.quascirev.2012.11.027
Open Access Status DOI
Volume 74
Start page 97
End page 114
Total pages 18
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 2306 Global and Planetary Change
1204 Archaeology
1105 Ecology, Evolution, Behavior and Systematics
3302 Archaeology
1907 Geology
Abstract The tropics are the major source of heat and moisture for the Australasian region. Determining the tropics' response over time to changes in climate forcing mechanisms, such as summer insolation, and the effects of relative sea level on exposed continental shelves during the Last Glacial period, is an ongoing process of re-evaluation. We present a synthesis of climate proxy data from tropical Australasia spanning the last 30,000 years that incorporates deep sea core, coral, speleothem, pollen, charcoal and terrestrial sedimentary records.Today, seasonal variability is governed largely by the annual migration of the inter-tropical convergence zone (ITCZ), influencing this region most strongly during the austral summer. However, the position of the ITCZ has varied through time. Towards the end of Marine Isotope Stage (MIS) 3, conditions were far wetter throughout the region, becoming drier first in the south. Universally cooler land and sea-surface temperature (SST) were characteristic of the Last Glacial Maximum, with drier conditions than previously, although episodic wet periods are noted in the fluvial records of northern Australia. The deglacial period saw warming first in the Coral Sea and then the Indonesian seas, with a pause in this trend around the time of the Antarctic Cold Reversal (c. 14.5ka), coincident with the flooding of the Sunda Shelf. Wetter conditions occurred first in Indonesia around 17ka and northern Australia after 14ka. The early Holocene saw a peak in marine SST to the northwest and northeast of Australia. Modern vegetation was first established on Indonesia, then progressively south and eastward to NE Australia. Flores and the Atherton Tablelands show a dry period around 11.6ka, steadily becoming wetter through the early Holocene. The mid-late Holocene was punctuated by millennial-scale variability, associated with the El Niño-Southern Oscillation; this is evident in the marine, coral, speleothem and pollen records of the region.
Keyword Australasia
Indo Pacific Warm Pool
Tropics
Australian monsoon
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 0806
DP1092945
DP1095053
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
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