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Summer temperature fluctuations in Southwestern China during the end of the LGM and the last deglaciation

Summer temperature fluctuations in Southwestern China during the end of the LGM and the last deglaciation
Summer temperature fluctuations in Southwestern China during the end of the LGM and the last deglaciation
We present a sub-centennial resolution summer temperature record from the SE Tibetan Plateau (Tiancai Lake, SW China, 3900 m a.s.l.) derived from a chironomid stratigraphy covering the last c.19.5 ka. The record highlights the interaction between tropical and high latitude climate forcing through the changes in atmospheric circulation during the last deglaciation. The scale of the last glacial maximum (LGM) cooling is consistent with other tropical mountain regions at c.5 °C and a rapid recovery of temperatures at 19.0 ka is related to changes in adiabatic lapse rates at the end of the glaciation. The overall pattern of change shows that North Atlantic deglaciation climate events (the Heinrich 1 and Younger Dryas cooling events and the Bølling-Allerød warm period) are all recorded, but the influence of the events decline as the deglaciation progresses. We relate these patterns to North Atlantic Deep water ventilating the Southern Ocean and to the consequent movements of the Intertropical Convergence Zone (ITCZ) in the Indian Ocean Basin as transmitted through changes in the southern mid-latitude circulation.
0012-821X
78-87
Zhang, Enlou
b4eddd17-9879-40b7-81c7-8f887be2531b
Chang, Jie
0d1de76f-4131-45a6-983a-53b5efeb0585
Schulmeister, James
a3caba31-9181-4257-86cc-f82d0bd0cd00
Langdon, Peter
95b97671-f9fe-4884-aca6-9aa3cd1a6d7f
Sun, Weiwei
a2bfb0dc-a83d-4c59-b395-2a74be362a30
Cao, Yanmin
4d43ed81-5111-4cd2-915a-25653ea9f70c
Yang, Xiangdong
7fb74be0-db37-442a-bf12-9ce6018f41fb
Shen, Ji
6ed4f177-c43e-4f4b-87a0-b7ab748700c7
Zhang, Enlou
b4eddd17-9879-40b7-81c7-8f887be2531b
Chang, Jie
0d1de76f-4131-45a6-983a-53b5efeb0585
Schulmeister, James
a3caba31-9181-4257-86cc-f82d0bd0cd00
Langdon, Peter
95b97671-f9fe-4884-aca6-9aa3cd1a6d7f
Sun, Weiwei
a2bfb0dc-a83d-4c59-b395-2a74be362a30
Cao, Yanmin
4d43ed81-5111-4cd2-915a-25653ea9f70c
Yang, Xiangdong
7fb74be0-db37-442a-bf12-9ce6018f41fb
Shen, Ji
6ed4f177-c43e-4f4b-87a0-b7ab748700c7

Zhang, Enlou, Chang, Jie, Schulmeister, James, Langdon, Peter, Sun, Weiwei, Cao, Yanmin, Yang, Xiangdong and Shen, Ji (2019) Summer temperature fluctuations in Southwestern China during the end of the LGM and the last deglaciation. Earth and Planetary Science Letters, 509, 78-87. (doi:10.1016/j.epsl.2018.12.024).

Record type: Article

Abstract

We present a sub-centennial resolution summer temperature record from the SE Tibetan Plateau (Tiancai Lake, SW China, 3900 m a.s.l.) derived from a chironomid stratigraphy covering the last c.19.5 ka. The record highlights the interaction between tropical and high latitude climate forcing through the changes in atmospheric circulation during the last deglaciation. The scale of the last glacial maximum (LGM) cooling is consistent with other tropical mountain regions at c.5 °C and a rapid recovery of temperatures at 19.0 ka is related to changes in adiabatic lapse rates at the end of the glaciation. The overall pattern of change shows that North Atlantic deglaciation climate events (the Heinrich 1 and Younger Dryas cooling events and the Bølling-Allerød warm period) are all recorded, but the influence of the events decline as the deglaciation progresses. We relate these patterns to North Atlantic Deep water ventilating the Southern Ocean and to the consequent movements of the Intertropical Convergence Zone (ITCZ) in the Indian Ocean Basin as transmitted through changes in the southern mid-latitude circulation.

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Zhang_etal_EPSL_accepted2018 - Accepted Manuscript
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More information

Accepted/In Press date: 21 December 2018
e-pub ahead of print date: 11 January 2019
Published date: 1 March 2019

Identifiers

Local EPrints ID: 427496
URI: http://eprints.soton.ac.uk/id/eprint/427496
ISSN: 0012-821X
PURE UUID: fb042846-635a-47d3-8d16-32aa9b3a3df7
ORCID for Peter Langdon: ORCID iD orcid.org/0000-0003-2724-2643

Catalogue record

Date deposited: 21 Jan 2019 17:30
Last modified: 26 Nov 2021 05:51

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Contributors

Author: Enlou Zhang
Author: Jie Chang
Author: James Schulmeister
Author: Peter Langdon ORCID iD
Author: Weiwei Sun
Author: Yanmin Cao
Author: Xiangdong Yang
Author: Ji Shen

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