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学科主题: Geochemistry & Geophysics
题名: Changes in the thermocline structure of the Indonesian outflow during Terminations I and II
作者: Xu, J ; Holbourn, A ; Kuhnt, WG ; Jian, ZM ; Kawamura, H
通讯作者: jx@gpi.uni-kiel.de
关键词: sea surface temperature ; thermocline temperature ; Indonesian throughflow ; Timor sea ; Terminations I ; Termination II
刊名: EARTH AND PLANETARY SCIENCE LETTERS
发表日期: 2008-01-01
卷: 273, 期:40545, 页:152-162
收录类别: sci
部门归属: [Xu, Jian; Holbourn, Ann; Kuhnt, Wolfgang] Univ Kiel, Inst Geosci, D-24118 Kiel, Germany; [Jian, Zhimin] Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China; [Kawamura, Hiroshi] 21st Century COE Neosci Nat Hist, Grad Sch Sci, Div Biol, Kita Ku, Sapporo, Hokkaido 0600810, Japan
摘要: We present centennial records of sea surface and upper thermocline temperatures in Core MD01-2378 from the Timor Sea, which provide new insights into the variability of the Indonesian outflow across the last two glacial terminations. Mg/Ca in Globigerinoides ruber (white s. s.) indicates an overall increase of 3.2 degrees C in sea surface temperature (SST) over Termination I. Following an early Holocene plateau at 11.3-6.4 ka, SSTs cooled by 0.6 degrees C during the middle to late Holocene (6.4-0.7 ka). The early Holocene warming occurred in phase with increasing northern hemisphere summer insolation, coinciding with northward displacement of the Intertropical Convergence Zone, enhanced boreal summer monsoon and expansion of the Indo-Pacific Warm Pool. Thermocline temperatures (Pulleniatina obliquiloculata Mg/Ca) gradually decreased from 24.5 to 21.5 degrees C since 10.3 ka, reflecting intensification of a cool thermocline throughflow. The vertical structure of the upper ocean in the Timor Sea evolved in similar fashion during the Holocene and MIS5e, although the duration of SST plateaux differed (11.3 to 6.4 ka in Termination I and from 129 to 119 ka in Termination 11), which was probably due to the more intense northern hemisphere summer insolation during MIS 5e. During both terminations, SST increased simultaneously in the southern high latitudes and the tropical eastern Indian Ocean, suggesting virtually instantaneous atmospheric climate feedbacks between the high and low latitudes. (C) 2008 Elsevier B.V. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/8429
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Recommended Citation:
Xu, J; Holbourn, A; Kuhnt, WG; Jian, ZM; Kawamura, H.Changes in the thermocline structure of the Indonesian outflow during Terminations I and II,EARTH AND PLANETARY SCIENCE LETTERS,2008,273(40545):152-162
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