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|Title: ||Insolation and cross-hemispheric controls on Asian-Australian monsoon variability over the past glacials and interglacials.|
|Authors: ||Min-Te Chen|
|Contributors: ||NTOU:Institute of Applied Geosciences|
|Issue Date: ||2013-10-03T03:14:53Z
|Publisher: ||American Geophysical Union Fall Meeting|
|Abstract: ||The Asian-Australian summer monsoon (ASM) is primarily a synoptic feature determined by the differential thermal response to solar insolation between the Asian-Australian continents and the western Pacific warm pool (WPWP). Little is known about what process has played a key role in driving long-term ASM variability. Here we present a 180-ka record of terrestrial fluxes into offshore southeastern Papua New Guinea (PNG), a prevailing monsoon area in the WPWP. The terrestrial fluxes were estimated by a 230Th-normalized method, indicating higher terrestrial inputs into the ocean during glacial stages. We argue that the higher terrestrial fluxes are mainly fluvial, which in turn are linked to stronger ASM precipitation on land, though the increased terrestrial flux could be possibly also due to the lowstand or glacial erosion of mountain glaciers. Cross-spectral analysis indicates that the precipitation maxima is controlled by local summer insolation maxima, WPWP SST minima, and East Asian winter monsoon (EAWM) maxima in precession frequency bands (21-ka-1). This result suggests that the 21-ka components of the ASM in the past 180,000 years are not only insolation driven but also a dynamic component strengthened by cross-hemispheric pressure gradient resulted from the precession maxima forcing.|
|Appears in Collections:||[應用地球科學研究所] 演講及研討會|
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