Palaeoenvironmental change in tropical Australasia over the last 30,000 years - a synthesis by the OZ-INTIMATE group
| Type | Article | ||||||||
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| Date | 2013-08 | ||||||||
| Language | English | ||||||||
| Author(s) | Reeves Jessica M.1, Bostock Helen C.2, Ayliffe Linda K.3, Barrows Timothy T.4, de Deckker Patrick3, Devriendt Laurent S.5, Dunbar Gavin B.6, Drysdale Russell N.7, Fitzsimmons Kathryn E.8, Gagan Michael K.3, Griffiths Michael L.9, Haberle Simon G.10, Jansen John D.11, Krause Claire3, Lewis Stephen12, McGregor Helen V.5, Mooney Scott D.13, Moss Patrick14, Nanson Gerald C.5, Purcell Anthony3, Van Der Kaars Sander15, 16 | ||||||||
| Affiliation(s) | 1 : Univ Ballarat, Ctr Environm Management, Sch Sci Informat Technol & Engn, Ballarat, Vic 3353, Australia. 2 : Natl Inst Water & Atmospher Res, Wellington, New Zealand. 3 : Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia. 4 : Univ Exeter, Coll Life & Environm Sci, Exeter EX4 4QJ, Devon, England. 5 : Univ Wollongong, Sch Earth & Environm Sci, Wollongong, NSW 2522, Australia. 6 : Victoria Univ Wellington, Antarctic Res Ctr, Wellington, New Zealand. 7 : Univ Melbourne, Dept Resource Management & Geog, Melbourne, Vic 3010, Australia. 8 : Max Planck Inst Evolutionary Anthropol, Dept Human Evolut, Leipzig, Germany. 9 : William Patterson Univ, Dept Environm Sci, Wayne, NJ USA. 10 : Australian Natl Univ, Sch Culture Hist & Language, Canberra, ACT, Australia. 11 : Stockholm Univ, Dept Phys Geog & Quaternary Geol, S-10691 Stockholm, Sweden. 12 : James Cook Univ, TropWATER, Catchment Reef Res Grp, Townsville, Qld 4811, Australia. 13 : Univ New S Wales, Sch Biol Earth & Environm Sci, Sydney, NSW, Australia. 14 : Univ Queensland, Climate Res Grp, Sch Geog Planning & Environm Management, Brisbane, Qld, Australia. 15 : Monash Univ, Dept Geog & Environm Sci, Ctr Palynol & Palaeoecol, Clayton, Vic 3800, Australia. 16 : Vrije Univ Amsterdam, Cluster Earth & Climate, Dept Earth Sci, Fac Earth & Life Sci, NL-1081 HV Amsterdam, Netherlands. |
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| Source | Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2013-08 , Vol. 74 , P. 97-114 | ||||||||
| DOI | 10.1016/j.quascirev.2012.11.027 | ||||||||
| WOS© Times Cited | 148 | ||||||||
| Note | Linking Southern Hemisphere records and past circulation patterns: the AUS-INTIMATE project | ||||||||
| Keyword(s) | ITCZ, LGM, INTIMATE, Australasia, Indo-Pacific Warm Pool, Tropics, Australian monsoon | ||||||||
| 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. 14.5 ka), coincident with the flooding of the Sunda Shelf. Wetter conditions occurred first in Indonesia around 17 ka and northern Australia after 14 ka. 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 11.6 ka, steadily becoming wetter through the early Holocene. The mid-late Holocene was punctuated by millennial-scale variability, associated with the El Nino-Southern Oscillation; this is evident in the marine, coral, speleothem and pollen records of the region. | ||||||||
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