DOI: 10.1016/j.quascirev.2012.07.006
Scopus记录号: 2-s2.0-84876316267
论文题名: Abrupt increase in east Indonesian rainfall from flooding of the Sunda Shelf ~9500years ago
作者: Griffiths M.L. ; Drysdale R.N. ; Gagan M.K. ; Zhao J.-X. ; Hellstrom J.C. ; Ayliffe L.K. ; Hantoro W.S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 74 起始页码: 273
结束页码: 279
语种: 英语
英文关键词: Indonesia
; Monsoon
; Speleothem
; Sunda Shelf
Scopus关键词: Indonesia
; Indonesian throughflow
; Monsoon
; Monsoon rainfall
; North-east australia
; Sea surface temperatures
; Speleothem
; Sunda shelves
; Atmospheric temperature
; Floods
; Rain
; Sea level
; Atmospheric thermodynamics
; air-sea interaction
; deglaciation
; flooding
; metal
; oxygen isotope
; paleoclimate
; Postglacial
; proxy climate record
; rainfall
; rainforest
; sea level change
; sea surface temperature
; speleothem
; thermohaline circulation
; throughflow
; Indonesia
; Pacific Ocean
; South China Sea
; Sunda Shelf
英文摘要: We present a precisely dated, multi-proxy stalagmite record from Liang Luar Cave, Flores (southeast Indonesia) that reveals a rapid increase in Indonesian monsoon rainfall at ~9.5ka. A "ramp-fitting" method for detecting statistically significant inflections in a time-series was applied to the stalagmite δ18O, Mg/Ca, and Sr/Ca profiles to quantify the precise timing and magnitude of an abrupt increase in monsoon strength over a period of ~350years. Previously published lake-level records from the monsoon-affected Australian interior show a sudden intensification of the Australian monsoon at ~14ka. However, our records indicate that monsoon intensification in Flores occured ~4-5kyr later. The timing of the monsoon shift in Flores is synchronous with the rapid expansion of rainforest in northeast Australia and regional freshening of the southern Makassar Strait which, under present-day conditions, is sensitive to monsoon variability. The freshening of southern Makassar was coeval with an abrupt ~1.5°C cooling in the upper thermocline of the Timor Sea ~9.5ka, indicative of reduced surface heat transport by the Indonesian Throughflow (ITF) when the Java Sea opened during postglacial sea-level rise. This suggests that the abrupt increase in monsoon rainfall on Flores was not due to a change in the ITF - because a decrease in rainfall would be expected to accompany cooler local sea surface temperatures (SSTs) - but rather by the sudden increase in ocean surface area and/or temperature in the monsoon source region as the Sunda Shelf flooded during deglaciation. We propose that it was the abrupt intensification of the monsoon through the late deglaciation that maintained the subsequent structure of the ITF following the flooding of the Sunda Shelf at ~9.5ka. © 2012. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60573
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth System Science, University of California, Irvine, CA 92697-3100, United States; Department of Environmental Science, William Paterson University, Wayne, NJ 07470, United States; Department of Resource Management and Geography, Melbourne School of Land and Environment, University of Melbourne, Parkville, VIC 2010, Australia; Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia; Centre for Microscopy and Microanalysis, University of Queensland, Brisbane, QLD 4072, Australia; School of Earth Sciences, University of Melbourne, Parkville, VIC 3010, Australia; Research and Development Center for Geotechnology, Indonesian Institute of Sciences, Bandung 40135, Indonesia
Recommended Citation:
Griffiths M.L.,Drysdale R.N.,Gagan M.K.,et al. Abrupt increase in east Indonesian rainfall from flooding of the Sunda Shelf ~9500years ago[J]. Quaternary Science Reviews,2013-01-01,74