Changes in the thermocline structure of the Indonesian outflow during Terminations I and II
Changes in the thermocline structure of the Indonesian outflow during Terminations I and II
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DOI：
10.1016/j.epsl.2008.06.029
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发表时间：
2008-08
影响因子：
5.3
通讯作者：
Jian Xu;A. Holbourn;W. Kuhnt;Z. Jian;H. Kawamura
中科院分区：
文献类型：
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作者：
Jian Xu;A. Holbourn;W. Kuhnt;Z. Jian;H. Kawamura
我们提出了百年记录的海面和上层温跃层温度在核心MD 01 -2378帝汶海，这提供了新的见解的变化，印尼流出的最后两个冰川终端。红拟球孢菌（白色s. s.）表明终端I的海表温度（SST）总体升高3.2 °C。在11.3-6.4 ka的全新世早期高原之后，SST在全新世中晚期（6.4-0.7 ka）冷却了0.6 °C。全新世早期暖化与北方半球夏季日射增加同步发生，与热带辐合带北移、夏季风增强和印度洋-太平洋暖池扩大相一致。自10.3 ka以来，温跃层温度（Pulleniatinaericiloculata Mg/Ca）从24.5 °C逐渐下降到21.5 °C，反映了冷温跃层贯通流的加强。帝汶海上层海洋的垂直结构在全新世和MIS 5e以相似的方式演变，虽然SST高原的持续时间不同（11.3至6.4 ka在终端I和129至119 ka在终端II），这可能是由于更强烈的北方半球夏季太阳辐射在MIS 5e。在这两个终端，SST同时增加，在南部高纬度和热带东印度洋，这表明几乎瞬时的大气气候反馈之间的高纬度和低纬度。
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 °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 °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 °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 II), 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.