Evidence for Indonesian Throughflow slowdown during Heinrich events 3-5
Evidence for Indonesian Throughflow slowdown during Heinrich events 3-5
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DOI：
10.1029/2008pa001653
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
R. Zuraida;A. Holbourn;D. Nürnberg;W. Kuhnt;A. Dürkop;A. Erichsen
中科院分区：
文献类型：
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作者：
R. Zuraida;A. Holbourn;D. Nürnberg;W. Kuhnt;A. Dürkop;A. Erichsen
本文利用国际海洋全球变化研究核心MD01-2378（121°47.27′e和13°04.95′s，水深1783 m）在帝汶海印度尼西亚通流流出区获得了60-100年时间分辨率的海洋同位素第3阶段（类似于24-62 ka B. p）的海面和上层温跃层温度记录。近地表浮游有孔虫Globigerinoides rubber（白色）和上层温斜层Pulleniatina obliquiloculata的稳定同位素和Mg/Ca揭示了海因里希事件期间上层海洋热结构的快速变化。在Heinrich事件3、4和5期间，温跃层变暖和δ O-18（海水）（P. obliquiloculata记录）的增加反映了相对凉爽和新鲜的温跃层流动减弱，北太平洋和印度尼西亚海向热带印度洋出口的咸水减少。影响印尼海相同位素阶段3通流变异性的三个主要因素：(1)北半球变冷导致海因里希事件期间全球温盐环流减缓；(2)海平面上升控制爪哇海向印尼通流的淡水输出增加，时间约为60 ~ 47 ka； (3) 46 ~ 40 ka期间澳大利亚季风的日照相关变化与印度洋和印尼通流水群之间水文锋的迁移有关。
We present sea surface and upper thermocline temperature records (60-100 year temporal resolution) spanning marine isotope stage 3 (similar to 24-62 ka B. P.) from International Marine Global Change Study core MD01-2378 (121 degrees 47.27'E and 13 degrees 04.95'S; 1783 m water depth) located in the outflow area of the Indonesian Throughflow within the Timor Sea. Stable isotopes and Mg/Ca of the near-surface-dwelling planktonic foraminifer Globigerinoides ruber (white) and the upper thermocline-dwelling Pulleniatina obliquiloculata reveal rapid changes in the thermal structure of the upper ocean during Heinrich events. Thermocline warming and increased delta O-18(seawater) (P. obliquiloculata record) during Heinrich events 3, 4, and 5 reflect weakening of the relatively cool and fresh thermocline flow and reduced export of less saline water from the North Pacific and Indonesian Seas to the tropical Indian Ocean. Three main factors influenced Indonesian Throughflow variability during marine isotope stage 3: (1) global slowdown in thermohaline circulation during Heinrich events triggered by Northern Hemisphere cooling, (2) increased freshwater export from the Java Sea into the Indonesian Throughflow controlled by rising sea level from similar to 60 to 47 ka, and (3) insolation-related changes in the Australasian monsoon with associated migration of hydrological fronts between Indian Ocean- and Indonesian Throughflow-derived water masses at similar to 46-40 ka.