Change of Indonesian Throughflow outflow in response to East Asian monsoon and ENSO activities since the Last Glacial
Change of Indonesian Throughflow outflow in response to East Asian monsoon and ENSO activities since the Last Glacial
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末次冰期以来印尼贯穿流量变化对东亚季风和 ENSO 活动的响应
DOI：
10.1007/s11430-014-4845-0
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发表时间：
2014-03
期刊：
影响因子：
--
通讯作者：
Xu Jian
中科院分区：
文献类型：
--
作者：
Xu Jian
印度尼西亚通流（ITF）连接西太平洋和印度洋的上层海水，调节这些海洋之间的热量和淡水收支，反过来在全球气候变化中发挥重要作用。东亚季风和厄尔尼诺Niño-Southern涛动（ENSO）等气候现象对ITF的通量、水性质和垂直分层有重要影响。为了探讨末次冰期以来ITF对季风和ENSO活动的响应，本文研究了从东帝汶海ITF流出侧获取的SO18462岩芯沉积物。基于浮游有孔虫表层和温跃层的Mg/Ca比值和氧同位素，重建了表层和温跃层的海水温度和盐度以及ITF流出的垂直热梯度。然后将SO18462岩芯记录与西太平洋暖池（WPWP）回收的3cBX岩芯记录进行比较。结果表明，末次冰期帝汶岛海和西孟加拉湾出现了相似的地表水。自~ 16 ka以来，这两个地区的地表水在盐度方面存在明显差异，帝汶海的水比西孟加拉湾的淡水要新鲜得多。相比之下，海温（SSTs）差变化不大。温跃层温度（TT）自末次冰期以来上升至~ 11.5 ka，在全新世后期，帝汶海温跃层温度总体保持不变，但在全新世后期持续下降。自~ 6 ka以来，帝汶海和西太平洋之间的温跃层水趋于彼此靠近。东亚季风和可能的ENSO冷相导致的降水增强显著地改善了印度尼西亚海的表层水，阻碍了ITF的表面流动，从而增强了全新世的温跃层流动。因此，在全新世晚期，ITF流出的温跃层水逐渐冷却，温跃层逐渐变浅。推测除了东亚冬季风的增强外，全新世晚期ENSO事件的增加可能对ITF流出的温跃层深度产生了重要影响。
The Indonesian Throughflow (ITF) links upper ocean waters of the west Pacific and Indian Ocean, modulates heat and fresh water budgets between these oceans, and in turn plays an important role in global climate change. The climatic phenomena such as the East Asian monsoon and El Niño-Southern Oscillation (ENSO) exert a strong influence on flux, water properties and vertical stratification of the ITF. This work studied sediments of Core SO18462 that was retrieved from the outflow side of the ITF in the Timor Sea in order to investigate response of the ITF to monsoon and ENSO activities since the last glacial. Based on Mg/Ca ratios and oxygen isotopes in shells of planktonic foraminiferal surface and thermocline species, seawater temperatures and salinity of both surface and thermocline waters and vertical thermal gradient of the ITF outflow were reconstructed. Records of Core SO18462 were then compared with those from Core 3cBX that was recovered from the western Pacific warm pool (WPWP). The results displayed that similar surface waters occurred in the Timor Sea and the WPWP during the last glacial. Since ∼16 ka, an apparent difference in surface waters between these two regions exists in salinity, indicated by much fresher waters in the Timor Sea than in the WPWP. In contrast, there is little change in difference of sea surface temperatures (SSTs). With regard to thermocline temperature (TT), it increased until ∼11.5 ka since the last glacial, and then remained an overall unchanged trend in the WPWP but continuously decreased in the Timor Sea towards the late Holocene. Since ∼6 ka, thermocline waters have tended to be close to each other in between the Timor Sea and the WPWP. It is indicated that intensified precipitation due to East Asian monsoon and possible ENSO cold phase significantly freshened surface waters over the Indonesian Seas, impeding the ITF surface flow and in turn having enhanced thermocline flow during the Holocene. Consequently, thermocline water of the ITF outflow was cooling and thermocline was shoaling towards the late Holocene. It is speculated that, in addition to strengthening of East Asian winter monsoon, increasing ENSO events during the late Holocene likely played an important role in influencing thermocline depth of the ITF outflow.
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影响因子：
5.3
作者：
Kisakuerek, B.;Eisenhauer, A.;Erez, J.
通讯作者：
Erez, J.
影响因子：
56.9
作者：
D. Yuan;Hai Cheng;R. Edwards;C. A. Dykoski;M. J. Kelly;Meiliang Zhang;Jiaming Qing;Yushi Lin
通讯作者：
D. Yuan;Hai Cheng;R. Edwards;C. A. Dykoski;M. J. Kelly;Meiliang Zhang;Jiaming Qing;Yushi Lin
DOI：
10.1073/pnas.97.4.1355
发表时间：
2000-02
影响因子：
11.1
作者：
R. T. Pierrehumbert
通讯作者：
R. T. Pierrehumbert
DOI：
10.1016/s0967-0637(00)00100-x
发表时间：
2001-06
期刊：
--
影响因子：
--
作者：
Maria Jayvee B. Udarbe-Walker;C. Villanoy
通讯作者：
Maria Jayvee B. Udarbe-Walker;C. Villanoy
影响因子：
--
作者：
Anand, P;Elderfield, H;Conte, MH
通讯作者：
Conte, MH