DOI: 10.1016/j.quascirev.2016.12.006
Scopus记录号: 2-s2.0-85007559660
论文题名: Hydrological and vegetation shifts in the Wallacean region of central Indonesia since the Last Glacial Maximum
作者: Wicaksono S.A. ; Russell J.M. ; Holbourn A. ; Kuhnt W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 157 起始页码: 152
结束页码: 163
语种: 英语
英文关键词: Biomarker
; Indonesia
; Isotope
; Last Glacial Maximum
; Precipitation
; Vegetation
Scopus关键词: Biodiversity
; Biomarkers
; Carbon
; Climatology
; Glacial geology
; Isotopes
; Meteorology
; Moisture
; Precipitation (chemical)
; Rain
; Time varying control systems
; Asian summer monsoons
; Atmospheric circulation
; Indonesia
; Intertropical convergence zone
; Isotope compositions
; Isotopic composition
; Last Glacial Maximum
; Northern Hemispheres
; Vegetation
; Gabaza
英文摘要: Precipitation is the most important variable of Indonesian climate, yet there are substantial uncertainties about past and future hydroclimate dynamics over the region. This study explores vegetation and rainfall and associated changes in atmospheric circulation during the past 26,000 years in Wallacea, a biogeographical area in central Indonesia, wedged between the Sunda and Sahul shelves and known for its exceptionally high rainforest biodiversity. We use terrestrial plant biomarkers from sediment cores retrieved from Mandar Bay, off west Sulawesi, to reconstruct changes in Wallacean vegetation and climate since the Last Glacial Maximum (LGM). Enriched leaf wax carbon isotope (δ13Cwax) values recorded in Mandar Bay during the LGM, together with other regional vegetation records, document grassland expansion, implying a regionally dry, and possibly more seasonal, glacial climate. Depleted leaf wax deuterium isotope (δDwax) values in Mandar Bay during the LGM, and low reconstructed precipitation isotope compositions from nearby sites, reveal an intensified Austral-Asian summer monsoon circulation and a southward shift of the mean position of the Intertropical Convergence Zone, likely due to strong southern hemisphere summer insolation and the presence of large northern hemisphere ice sheets. Mandar Bay δ13Cwax was anti-correlated with δDwax during the LGM and the last deglaciation, but was positively correlated during most of the Holocene, indicating time-varying controls on the isotopic composition of rainfall in this region. The inundation event of the Sunda Shelf and in particular the opening of the Java Sea and Karimata Strait between 9.4 and 11.1 thousand years ago might have provided new moisture sources for regional convection and/or influenced moisture source trajectories, providing the trigger for shifts in atmospheric circulation and the controls on precipitation isotope compositions from the LGM to the Holocene. © 2016 Elsevier Ltd 资助项目: We acknowledge financial support from the National Science Foundation (NSF-EAR-1144623) to James M. Russell and funding from the German Bundesministerium für Bildung und Forschung (BMBF, SO-217, MAJA, 03G0217A) and the Deutsche Forschungsgemeinschaft (DFG, KU 649/32-1) to Ann Holbourn and Wolfgang Kuhnt. We thank Patrick Holland-Stergar and Rafael Tarozo for laboratory assistance. Yongsong Huang, Steve Clemens, John King, Jack Mustard, and Bronwen Konecky are thanked for discussions on interpretations of these data.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59333
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth, Environmental, and Planetary Sciences, Brown University, Box 1846, Providence, RI, United States; Institute of Geosciences, University of Kiel, Ludewig-Meyn-Str 10, Kiel, Germany
Recommended Citation:
Wicaksono S.A.,Russell J.M.,Holbourn A.,et al. Hydrological and vegetation shifts in the Wallacean region of central Indonesia since the Last Glacial Maximum[J]. Quaternary Science Reviews,2017-01-01,157