Dynamics of the Australian-Indonesian monsoon across Termination; II, Implications of molecular-biomarker reconstructions from the Timor Sea

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doi: 10.1016/j.palaeo.2015.01.027
Author(s): Huang Enqing; Tian Jun; Liu Jingjing
Author Affiliation(s): Primary:
Tongji University, State Key Laboratory of Marine Geology, Shanghai, China
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.423, p.32-43. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 87 refs.; illus., incl. charts, sketch map
Summary: Molecular biomarker-derived proxies in a marine sediment core from the eastern Timor Sea have been employed to track changes in the Australian-Indonesian monsoon system over the time period from the penultimate glacial to the last interglacial. The average chain length of n-alkanes originating from terrestrial higher plants reveals an expansion of woody plants during both Termination II and the last interglacial with respect to the penultimate glacial. This is consistent with previous reconstructions for the last glacial-interglacial cycle, indicating that water-stress conditions during dry seasons of southern Indonesia should have been relieved during interglacials and deglacials relative to glacials. However, in contrast to an only muted response during Heinrich Stadial 1, the vegetation composition showed a dramatic and prominent change during Heinrich Stadial 11. This was probably caused by a much more significant and longer duration iceberg discharge event to the northern North Atlantic during Heinrich Stadial 11 relative to Heinrich Stadial 1, which exerted a significant influence on the tropical hydrological cycle and monsoon rainfall seasonality. In addition, marine algae-derived biomarkers are used to reconstruct primary productivity variations, which are in agreement with previous studies from the same area. The precessional cyclicity of paleo-productivity variations is possibly induced by changes in the Australian-Indonesian winter monsoon intensity, showing a correlation with boreal winter insolation. However, this phase relationship is in contrast to the inference based on other lines of evidence, which suggests strong winter monsoon strength during boreal summer insolation maxima. New winter monsoon proxies are therefore required to clarify this discrepancy. Abstract Copyright (2015) Elsevier, B.V.
Year of Publication: 2015
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; Atlantic Ocean; Australian-Indonesian monsoon; Benthic taxa; Biomarkers; Cenozoic; Foraminifera; Indian Ocean; Invertebrata; Isotope ratios; Isotopes; Leg 162; MIS 5; MIS 6; Microfossils; Middle Pleistocene; Monsoons; North Atlantic; O-18/O-16; ODP Site 980; Ocean Drilling Program; Oxygen; Paleoclimatology; Pleistocene; Protista; Quaternary; Rockall Bank; Stable isotopes; Timor Sea; Upper Pleistocene
Coordinates: S082959 S082959 E1281002 E1281002
N552906 N552906 W0144208 W0144208
Record ID: 2015049636
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands