Variability of the Indonesian Throughflow thermal profile over the last 25-kyr: A perspective from the southern Makassar Strait
Variability of the Indonesian Throughflow thermal profile over the last 25-kyr: A perspective from the southern Makassar Strait
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过去 25 公里印度尼西亚贯流热剖面的变化：来自望加锡海峡南部的视角
DOI：
10.1016/j.gloplacha.2018.08.003
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发表时间：
2018-10
影响因子：
3.9
通讯作者：
Hanning Wu
中科院分区：
文献类型：
--
作者：
Peng Zhang;Jian Xu;Jan F Schröder;Ann Holbourn;Wolfgang Kuhnt;Karlos G D Kochhann;Fei Ke;Zhen Wang;Hanning Wu
印度尼西亚通流（ITF）是太平洋和印度洋之间的唯一通道，调节这些海洋之间的热量和淡水预算，并在全球温盐环流中作为“温水通道”发挥关键作用。在这项研究中，我们基于在望加锡海峡南部的SO217-18515岩芯（3.63°S, 119.54°E，水深：688 m）中精确测年、高分辨率（~200 年）的pulleniatina obliquiloculataδ18O和Mg/Ca记录，重建了ITF温跃层的25 kyr历史。我们将这些新记录与吕宋岛近海（MD98-2188, 14.82°N, 123.49°E，水深730 m）、西太平洋暖池（WPWP）中心（3cBX, 8.02°N, 139.6°E，水深2829 m）和帝汶海（MD01-2378, 13.08°S, 121.79°E，水深1783 m）的数据进行了综合。在11 ~ 2.5 ka之间，望加西海峡南部和帝汶岛海的海表和温跃层温度均下降，其差值（ΔT）增大，对应于El Niño活动增强和东亚冬季风对夏季风的优势。与此相反，随着El Niño活动的减弱和东亚冬季风的相对减弱，近2.5年海面和温跃层温度呈上升和ΔT下降趋势。此外，我们的研究结果还表明，SO217-18515和MD01-2378岩心的海面和温跃层的冰体积校正海水δ18O与代表WPWP区域降水的婆罗洲石笋δ18O共同变化，从而表明上层海水沿ITF路径垂直混合。我们认为，与区域降水相关的El Niño-Southern涛动状态和东亚季风的变化对全新世ITF温跃层剖面产生了重大影响，并在很大程度上控制了过去25年ITF温跃层温度的变化。
The Indonesian Throughflow (ITF), the sole conduit between the Pacific and Indian Oceans, regulates the heat and fresh water budgets between these oceans and plays a key role as the ‘warm water pathway’ in the global thermohaline circulation. In this study, we reconstructed a 25-kyr history of the ITF thermocline, based on well-dated, high-resolution (~200 yrs) records ofPulleniatina obliquiloculataδ18O and Mg/Ca from Core SO217-18515 (3.63°S, 119.54°E; water depth: 688 m), retrieved from the southern Makassar Strait. We integrated these new records with data from offshore Luzon (MD98-2188; 14.82°N, 123.49°E; water depth: 730 m), from the center of the Western Pacific Warm Pool (WPWP) (3cBX; 8.02°N, 139.6°E; water depth: 2829 m) and from the Timor Sea (MD01-2378; 13.08°S, 121.79°E; water depth: 1783 m). Both sea surface and thermocline temperatures decreased and their difference (ΔT) increased in the southern Makassar Strait and Timor Sea between 11 and 2.5 ka, corresponding to enhanced El Niño activity and dominance of East Asian winter monsoon over summer monsoon. In contrast, sea surface and thermocline temperatures increased and ΔT decreased during the last ~2.5 kyrs concomitantly with declining El Niño activity and relative weakening of the East Asian winter monsoon. Our results additionally show that ice volume corrected seawater δ18O of both sea surface and thermocline in Cores SO217-18515 and MD01-2378 co-vary with Borneo stalagmite δ18O, a proxy of regional precipitation in the WPWP, thus indicating vertical mixing of upper ocean waters along the ITF pathway. We propose that changes in the state of the El Niño-Southern Oscillation and in East Asian monsoon related to regional precipitation exerted a major influence on the ITF thermocline profile during the Holocene and largely controlled changes in ITF thermocline temperature throughout the last 25 kyrs.
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影响因子：
3.6
作者：
Qu, T;Mitsudera, H;Yamagata, T
通讯作者：
Yamagata, T
影响因子：
4
作者：
Jan F. Schröder;A. Holbourn;W. Kuhnt;K. Küssner
通讯作者：
Jan F. Schröder;A. Holbourn;W. Kuhnt;K. Küssner
影响因子：
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影响因子：
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作者：
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通讯作者：
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5.3
作者：
M. Sarnthein;P. Grootes;A. Holbourn;W. Kuhnt;Hartmut Kühn
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