Monsoon versus ocean circulation controls on paleoenvironmental conditions off southern Sumatra during the past 300,000 years
Luckge, A; Mohtadi, M; Ruhlemann, C; Scheeder, G; Vink, A; Reinhardt, L; Wiedicke, M; andreas.lueckge@bgr.de
2009
发表期刊PALEOCEANOGRAPHY
ISSN0883-8305
卷号24页码:-PA1208
摘要A multiproxy record has been acquired from a piston core (SO139-74KL) taken offshore southern Sumatra, an area which is situated in the southwestern sector of the tropical Indo-Pacific Warm Pool. The high-resolution data sets (X-ray fluorescence, total organic carbon, and C-37 alkenones) were used to track changes in paleoproductivity, freshwater budget, and sea surface temperature (SST) of the tropical climate system at orbital time scales over the past 300 ka. Our paleoclimatic data show that enhanced marine paleoproductivity was directly related to strengthening of coastal upwelling during periods of increased boreal summer insolation and associated SE monsoon strength with a precessional cyclicity. Changes in freshwater supply were primarily forced by precession-controlled changes in boreal NW winter monsoon rainfall enclosing an additional sea level component. SST variations of 2 degrees-5 degrees C occurred at eccentricity and precessional cyclicity. We suggest that the sea surface temperature variability off southern Sumatra is predominantly related to three major causes: (1) variations in upwelling intensity; (2) an elevated freshwater input into the southern Makassar Strait leading to reduced supply of warmer surface waters from the western Pacific and increased subsurface water transport via the Indonesian Throughflow into the Indian Ocean; and (3) long-term changes in the intensity or frequency of low-latitude climate phenomena, such as El Nino-Southern Oscillation.
部门归属[Lueckge, Andreas; Ruehlemann, Carsten; Scheeder, Georg; Vink, Annemiek; Reinhardt, Lutz; Wiedicke, Michael] Fed Inst Geosci & Nat Resources, D-30655 Hannover, Germany; [Mohtadi, Mahyar] Univ Bremen, MARUM, D-28359 Bremen, Germany
学科领域Geosciences, Multidisciplinary ; Oceanography ; Paleontology
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收录类别sci
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/8421
专题海洋科技动态信息-印太暖池系统研究
通讯作者andreas.lueckge@bgr.de
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Luckge, A,Mohtadi, M,Ruhlemann, C,et al. Monsoon versus ocean circulation controls on paleoenvironmental conditions off southern Sumatra during the past 300,000 years[J]. PALEOCEANOGRAPHY,2009,24:-PA1208.
APA Luckge, A.,Mohtadi, M.,Ruhlemann, C.,Scheeder, G.,Vink, A.,...&andreas.lueckge@bgr.de.(2009).Monsoon versus ocean circulation controls on paleoenvironmental conditions off southern Sumatra during the past 300,000 years.PALEOCEANOGRAPHY,24,-PA1208.
MLA Luckge, A,et al."Monsoon versus ocean circulation controls on paleoenvironmental conditions off southern Sumatra during the past 300,000 years".PALEOCEANOGRAPHY 24(2009):-PA1208.
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