55 research outputs found
Glacial to Holocene swings of the Australian–Indonesian monsoon
Author Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of Nature Publishing Group for personal use, not for redistribution. The definitive version was published in Nature Geoscience 4 (2011): 540–544, doi:10.1038/ngeo1209.The Australian-Indonesian monsoon is an important component of the climate system in
the tropical Indo-Pacific region. However, its past variability, relation with northern
and southern high latitude climate and connection to the other Asian monsoon systems
are poorly understood. Here we present high-resolution records of monsoon-controlled
austral winter upwelling during the past 22,000 years, based on planktic foraminiferal
oxygen isotope and faunal composition in a sedimentary archive collected offshore
southern Java. We show that glacial-interglacial variations in the Australian-Indonesian
winter monsoon were in phase with the Indian summer monsoon system, consistent with
their modern linkage through cross-equatorial surface winds. Likewise, millennial-scale
variability of upwelling shares similar sign and timing with upwelling variability in the
Arabian Sea. On the basis of element composition and grain-size distribution as
precipitation-sensitive proxies in the same archive, we infer that (austral) summer
monsoon rainfall was highest during the Bølling-Allerød period and the past 2,500 years.
Our results indicate drier conditions during Heinrich Stadial 1 due to a southward shift
of summer rainfall and a relatively weak Hadley Cell south of the Equator. We suggest
that the Australian-Indonesian summer and winter monsoon variability were closely
linked to summer insolation and abrupt climate changes in the northern hemisphere.This study was funded by the German Bundesministerium für
Bildung und Forschung (PABESIA) and the Deutsche Forschungsgemeinschaft (DFG, HE
3412/15-1). DWO’s participation was funded by the U.S. National Science Foundation
Holocene sea level and environmental change on the west coast of South Africa: evidence from plant biomarkers, stable isotopes and pollen
Organic matter in Neogene sediments of the southern Canary Islands (ODP Sites 955 and 956)
Qualification of organic matter degradation by microbial sulphate reduction for quaternary sediments from the northern Arabian Sea
Quantification of organic matter degradation by microbial sulphate reduction for Quaternary sediments from the northern Arabian Sea
Early diagenetic alteration of organic matter by sulfate reduction in quaternary sediments from the northeastern Arabian Sea
A 65,000 yr record of organic matter deposition and climatic variations in sediments from the oxygen-minimum zone of the Pakistan continental margin
A 65,000 yr record of organic matter deposition and climatic variations in sediments from the oxygen-minimum zone of the Pakistan continental margin
Early diagenetic alteration of organic matter by sulfate reduction in quaternary sediments from the northeastern Arabian Sea
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