PALEOCEANOGRAPHIC RECORDS OF INDONESIAN THROUGHFLOW AT ITS EXIT SINCE THE LAST GLACIAL AND THEIR SIGNIFICANCE

ZHANG Peng; XU Jian; YANG Ce; GAO Lianfeng; ZHANG Zhenguo; NIU Yao

doi:10.16562/j.cnki.0256-1492.2017.03.013

2017 Vol. 37, No. 3

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ZHANG Peng, XU Jian, YANG Ce, GAO Lianfeng, ZHANG Zhenguo, NIU Yao. PALEOCEANOGRAPHIC RECORDS OF INDONESIAN THROUGHFLOW AT ITS EXIT SINCE THE LAST GLACIAL AND THEIR SIGNIFICANCE[J]. Marine Geology & Quaternary Geology, 2017, 37(3): 129-137. doi: 10.16562/j.cnki.0256-1492.2017.03.013

Citation:

ZHANG Peng, XU Jian, YANG Ce, GAO Lianfeng, ZHANG Zhenguo, NIU Yao. PALEOCEANOGRAPHIC RECORDS OF INDONESIAN THROUGHFLOW AT ITS EXIT SINCE THE LAST GLACIAL AND THEIR SIGNIFICANCE[J]. Marine Geology & Quaternary Geology, 2017, 37(3): 129-137. doi: 10.16562/j.cnki.0256-1492.2017.03.013

PALEOCEANOGRAPHIC RECORDS OF INDONESIAN THROUGHFLOW AT ITS EXIT SINCE THE LAST GLACIAL AND THEIR SIGNIFICANCE

1.
Institute of Cenozoic Geology and Environment, Department of Geology, Northwest University Xi'an 710069
2.
State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi'an 710069
3.
School of Mining Engineering, North China University of Science and Technology, Tangshan 063009
4.
The Fifth Geological Team, Henan Province Non-ferrous Metals Geological Mineral Resources Bureau, Zhengzhou 450016

More Information

Corresponding author: XU Jian, jx08@live.cn

Received Date: 22 June 2016

Revised Date: 06 September 2016

Publish Date: 28 June 2017

Abstract

Abstract

The Indonesian Throughflow (ITF), sole conduit between the Pacific and Indian Oceans, plays an important role in regulating heat and fresh water budgets between the two oceans, and in controlling the tropical and global climate. In this study, we investigated records from the Core SO18460 that was drilled at the exit of the ITF into the Timor Sea to reexamine their significance in reflecting the ITF since the last glacial. Records of temperature and salinity of surface and subsurface seawaters, and depth of thermocline (DOT) were reconstructed from δ¹⁸O and Mg/Ca ratio of the planktonic foraminifera of Globigerinoides ruber and Pulleniatina obliquiloculata and were then compared with regional paleoclimatic indices. The results show that salinity of both surface and thermocline seawaters co-varied with regional precipitation over the last glacial cycle, likely indicating transmission of precipitation signal by means of seawater salinity from sea surface to thermocline through upper ocean mixing. Sea surface temperature at the coring site of Core SO18460 oscillated centering at 28 ℃, possibly under influence of the Western Pacific Warm Pool since the early Holocene. In contrast, thermcoline seawater temperature (TWT) was always below 22 ℃, probably indicating that El Niño-Southern Oscillation was located in El Niño-like episodes. Decline of TWT and shoal of DOT might be, on the one hand, in response to more frequent El Niño-like events; and on the other hand, resulted from depression of ITF surface flow caused by increased precipitation due to southward shift of the Intertropical Convergence Zone, and/or by intensification of South China Sea surface flow driven by enhanced East Asian winter monsoon during Holocene. On glacial-interglacial timescale, TWT co-varied with the boreal summer insolation, possibly due to influence of North Pacific Tropical Water sourced waters that were carried by the Mindanao Current to the Sulawesi Sea and merged into the ITF.
- Indonesian Throughflow /
- salinity /
- Western Pacific Warm Pool /
- El Niño-Southern Oscillation /
- North Pacific Tropical Water

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