Abrupt warming of the equatorial intermediate Pacific during Heinrich Stadial 1

The Pacific intermediate water is essential for global ocean heat storage and transfer and connected to the higher latitude sea areas. Its thermohaline evolution and relationship to high latitudes on millennium scales, however, are both poorly understood. In this study, we used sediment core KX22-4...

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Bibliographic Details
Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Zhang, Shuai, Li, Tiegang, Yu, Zhoufei, Chang, Fengming, Gu, Sifan, Xiong, Zhifang, Liu, Heng, Qian, Fang, Zhang, Junru, Cheng, Xuhua, Li, Baohua
Format: Report
Language:English
Published: ELSEVIER 2023
Subjects:
Western equatorial Pacific
Intermediate water
Heinrich Stadial 1
Thermohaline evolution
MERIDIONAL OVERTURNING CIRCULATION
NORTH PACIFIC
PLANKTONIC-FORAMINIFERA
LAST DEGLACIATION
SURFACE-WATER
OXYGEN ISOTOPES
HEAT-CONTENT
DEEP-OCEAN
ATLANTIC
CARBON
Physical Geography
Geology
Paleontology
Geography
Physical
Geosciences
Multidisciplinary
Antarctic
Southern Ocean
Pacific
Antarc*
Planktonic foraminifera
Online Access:http://ir.nigpas.ac.cn/handle/332004/42671
http://ir.nigpas.ac.cn/handle/332004/42672
https://doi.org/10.1016/j.palaeo.2023.111600
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Summary:The Pacific intermediate water is essential for global ocean heat storage and transfer and connected to the higher latitude sea areas. Its thermohaline evolution and relationship to high latitudes on millennium scales, however, are both poorly understood. In this study, we used sediment core KX22-4 in the western equatorial Pacific to reconstruct the thermohaline and & delta;13C variations in the intermediate water over the past 28,000 years based on Mg/Ca, & delta;18O and & delta;13C measurements of deep dwelling planktonic foraminiferal species. The results show that during Heinrich Stadial 1, the temperature of intermediate water rapidly increased by roughly 6 degrees C and was simultaneous with the Southern Ocean surface water, carrying a typical Antarctic signature along with the salter and reduced & delta;13C signals. The Southern Hemisphere climatic development and the advection of the thermal anomaly into the tropical intermediate Pacific via the Southern Ocean intermediate water are thought to be closely coupled.

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