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Possible obliquity-forced warmth in southern Asia during the last glacial stage

Possible obliquity-forced warmth in southern Asia during the last glacial stage
Possible obliquity-forced warmth in southern Asia during the last glacial stage
Orbital-scale global climatic changes during the late Quaternary are dominated by high-latitude influenced ∼100,000-year global ice-age cycles and monsoon influenced ∼23,000-year low-latitude hydroclimate variations. However, the shortage of highly-resolved land temperature records remains a limiting factor for achieving a comprehensive understanding of long-term low-latitude terrestrial climatic changes. Here, we report paired mean annual air temperature (MAAT) and monsoon intensity proxy records over the past 88,000 years from Lake Tengchongqinghai in southwestern China. While summer monsoon intensity follows the ∼23,000-year precession beat found also in previous studies, we identify previously unrecognized warm periods at 88,000−71,000 and 45,000−22,000 years ago, with 2−3 °C amplitudes that are close to our recorded full glacial-interglacial range. Using advanced transient climate simulations and comparing with forcing factors, we find that these warm periods in our MAAT record probably depends on local annual mean insolation, which is controlled by Earth’s ∼41,000-year obliquity cycles and is anti-phased to annual mean insolation at high latitudes. The coincidence of our identified warm periods and intervals of high-frequent dated archaeological evidence highlights the importance of temperature on anatomically modern humans in Asia during the last glacial stage.
2095-9273
Zhao, Cheng
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Rohling, Eelco J.
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Liu, Zhengyu
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Yang, Xiaoqiang
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Zhang, Enlou
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Cheng, Jun
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Liu, Zhonghui
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An, Zhisheng
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Yang, Xiangdong
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Feng, Xiaoping
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Sun, Xiaoshuang
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Zhang, Can
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Yan, Tianlong
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Long, Hao
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Yan, Hong
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Yu, Zicheng
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Liu, Weiguo
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Yu, Shi-Yong
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Shen, Ji
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Zhao, Cheng
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Rohling, Eelco J.
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Liu, Zhengyu
2e755222-8bc0-47ed-961a-19bc9e428005
Yang, Xiaoqiang
e0b215d3-5737-4761-a4ac-1da85d160a9b
Zhang, Enlou
53b50c45-bb12-4d5f-86e4-e656d44bcfa1
Cheng, Jun
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Liu, Zhonghui
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An, Zhisheng
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Yang, Xiangdong
7ecb5c8e-22cb-4f65-829d-8b3442dc6529
Feng, Xiaoping
33c3019a-7f67-4153-9af3-64ed22914989
Sun, Xiaoshuang
89c685df-6443-43bc-85d9-fdeb8f7ec8d0
Zhang, Can
d248e399-21ab-4bfb-bc48-3373f0775d15
Yan, Tianlong
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Long, Hao
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Yan, Hong
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Yu, Zicheng
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Liu, Weiguo
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Yu, Shi-Yong
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Shen, Ji
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Zhao, Cheng, Rohling, Eelco J., Liu, Zhengyu, Yang, Xiaoqiang, Zhang, Enlou, Cheng, Jun, Liu, Zhonghui, An, Zhisheng, Yang, Xiangdong, Feng, Xiaoping, Sun, Xiaoshuang, Zhang, Can, Yan, Tianlong, Long, Hao, Yan, Hong, Yu, Zicheng, Liu, Weiguo, Yu, Shi-Yong and Shen, Ji (2020) Possible obliquity-forced warmth in southern Asia during the last glacial stage. Chinese Science Bulletin. (doi:10.1016/j.scib.2020.11.016).

Record type: Article

Abstract

Orbital-scale global climatic changes during the late Quaternary are dominated by high-latitude influenced ∼100,000-year global ice-age cycles and monsoon influenced ∼23,000-year low-latitude hydroclimate variations. However, the shortage of highly-resolved land temperature records remains a limiting factor for achieving a comprehensive understanding of long-term low-latitude terrestrial climatic changes. Here, we report paired mean annual air temperature (MAAT) and monsoon intensity proxy records over the past 88,000 years from Lake Tengchongqinghai in southwestern China. While summer monsoon intensity follows the ∼23,000-year precession beat found also in previous studies, we identify previously unrecognized warm periods at 88,000−71,000 and 45,000−22,000 years ago, with 2−3 °C amplitudes that are close to our recorded full glacial-interglacial range. Using advanced transient climate simulations and comparing with forcing factors, we find that these warm periods in our MAAT record probably depends on local annual mean insolation, which is controlled by Earth’s ∼41,000-year obliquity cycles and is anti-phased to annual mean insolation at high latitudes. The coincidence of our identified warm periods and intervals of high-frequent dated archaeological evidence highlights the importance of temperature on anatomically modern humans in Asia during the last glacial stage.

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Accepted/In Press date: 28 October 2020
e-pub ahead of print date: 1 December 2020

Identifiers

Local EPrints ID: 446061
URI: http://eprints.soton.ac.uk/id/eprint/446061
ISSN: 2095-9273
PURE UUID: 643b7fbb-8d9f-4612-bc0e-862caa66a96c
ORCID for Eelco J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158

Catalogue record

Date deposited: 20 Jan 2021 17:30
Last modified: 01 Dec 2021 05:01

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Contributors

Author: Cheng Zhao
Author: Zhengyu Liu
Author: Xiaoqiang Yang
Author: Enlou Zhang
Author: Jun Cheng
Author: Zhonghui Liu
Author: Zhisheng An
Author: Xiangdong Yang
Author: Xiaoping Feng
Author: Xiaoshuang Sun
Author: Can Zhang
Author: Tianlong Yan
Author: Hao Long
Author: Hong Yan
Author: Zicheng Yu
Author: Weiguo Liu
Author: Shi-Yong Yu
Author: Ji Shen

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