Centennial-scale climate variability in the Timor Sea during Marine Isotope Stage 3
Centennial-scale climate variability in the Timor Sea during Marine Isotope Stage 3
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DOI：
10.1016/j.marmicro.2007.10.002
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发表时间：
2008-02-20
影响因子：
1.9
通讯作者：
Grootes, Pieter M.
中科院分区：
文献类型：
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作者：
Duerkop, Anke;Holbourn, Ann;Grootes, Pieter M.
我们在澳大利亚西北部帝汶海的IMAGES Core MD01-2378（13°04.95′S和121°47.27′E，水深1783）中提供了一个高分辨率（类似于60-110年）的多代理记录，跨越了海洋同位素阶段3。今天，这一地区受到热带辐合带和印度尼西亚通流的主要流出的影响，热带辐合带在夏季南部驱动季风，而印度尼西亚通流是全球温盐环流系统的关键组成部分。因此，这个核心处于监测热带和高纬度气候变率之间联系的理想位置。底栖三角洲O-18资料（Planulina wuellerstorfi）清楚地反映了EPICA伯德和Dronning Maud陆地冰芯记录的南极暖化事件（A1-A4）。这个南方高纬度信号是由从南大洋向北流入印度洋的深层和中层水团传递的。浮游三角洲O-18与北部高纬度地区的浮游和冰芯记录更接近，但在我们的记录中只有持续时间较长的Dansgaard-Oeschger温暖事件8、12、14和16-17得到明确表达。这种地表水中的北方高纬度信号可能是通过大气遥相关和亚洲-澳大利亚季风系统的耦合传输的。底栖有孔虫普查计数表明南极变冷与帝汶海的碳通量模式耦合。我们将38 ~ 45 ka期间碳通量敏感物种丰度的增加与西澳大利亚洋流锋面区向东北迁移联系起来。Mg/Ca和浮游δ O-18值（gloigerinoides rubber white）的同时降低也支持了这种水团重组。(c) 2007 Elsevier B.V.版权所有
We present a high-resolution (similar to 60-110 yr) multi-proxy record spanning Marine Isotope Stage 3 from IMAGES Core MD01-2378 (13 degrees 04.95' S and 121 degrees 47.27' E, 1783 in water depth), located in the Timor Sea, off NW Australia. Today, this area is influenced by the Intertropical Convergence Zone, which drives monsoonal winds during austral summer and by the main outflow of the Indonesian Throughflow, which represents a key component of the global thermohaline circulation system. Thus, this core is ideally situated to monitor the linkages between tropical and high latitude climate variability. Benthic delta O-18 data (Planulina wuellerstorfi) clearly reflect Antarctic warm events (A1-A4) as recorded by the EPICA Byrd and Dronning Maud Land ice cores. This southern high latitude signal is transferred by deep and intermediate water masses flowing northward from the Southern Ocean into the Indian Ocean. Planktonic delta O-18 shows closer affinity to northern high latitudes planktonic and ice core records, although only the longer-lasting Dansgaard-Oeschger warm events, 8, 12, 14, and 16-17 are clearly expressed in our record. This northern high latitude signal in the surface water is probably transmitted through atmospheric teleconnections and coupling of the Asian-Australian monsoon systems. Benthic foraminiferal census counts suggest a coupling of Antarctic cooling with carbon flux patterns in the Timor Sea. We relate increasing abundances of carbon-flux sensitive species at 38-45 ka to the northeastward migration of the West Australian Current frontal area. This water mass reorganization is also supported by concurrent decreases in Mg/Ca and planktonic delta O-18 values (Globigerinoides ruber white). (c) 2007 Elsevier B.V. All rights reserved.