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Potential forcings of summer temperature variability of the southeastern Tibetan Plateau in the past 12 ka

Potential forcings of summer temperature variability of the southeastern Tibetan Plateau in the past 12 ka
Potential forcings of summer temperature variability of the southeastern Tibetan Plateau in the past 12 ka

Investigating potential forcing mechanisms of terrestrial summer temperature changes from the Asian summer monsoon influenced area is of importance to better understand the climate variability in these densely populated regions. The results of spectral and wavelet analyses of the published chironomid reconstructed mean July temperature data from Tiancai Lake on the SE Tibetan Plateau are presented. The evidence of solar forcing of the summer temperature variability from the site on centennial timescales where key solar periodicities (at 855 ± 40, 465 ± 40, 315 ± 40 and 165 ± 40 year) are revealed. By using a band-pass filter, coherent fluctuations were found in the strength of Asian summer monsoon, Northern Hemisphere high latitude climate and high elevation mid-latitude (26°N) terrestrial temperatures with solar sunspot cycles since about 7.6 ka. The two abrupt cooling events detected from the Tiancai Lake record, centered at ∼9.7 and 3.5 ka were examined respectively. Coupled with the paleoclimate modeling results, the early Holocene event (9.7 ka) is possibly linked to an ocean-atmospheric feedback mechanism whereas the latter event (3.5 ka) may be more directly related to external forcing.

Asian summer monsoon, External forcing, Solar cycles, Southeast Tibetan Plateau, Terrestrial summer temperatures
1367-9120
34-41
Zhang, Enlou
d69a1979-6a81-44d8-96cd-a6ed19bcda03
Chang, Jie
4a0808ec-10d6-41cc-96d8-4ca561beb31d
Sun, Weiwei
ac722c59-9886-4cff-85d3-e345e86fa3cb
Cao, Yanmin
0f6b2b8f-80eb-447d-9f7e-35d163b98ce9
Langdon, Peter
95b97671-f9fe-4884-aca6-9aa3cd1a6d7f
Cheng, Jun
ca33437f-59cb-42fb-a1a8-83b76a252ac2
Zhang, Enlou
d69a1979-6a81-44d8-96cd-a6ed19bcda03
Chang, Jie
4a0808ec-10d6-41cc-96d8-4ca561beb31d
Sun, Weiwei
ac722c59-9886-4cff-85d3-e345e86fa3cb
Cao, Yanmin
0f6b2b8f-80eb-447d-9f7e-35d163b98ce9
Langdon, Peter
95b97671-f9fe-4884-aca6-9aa3cd1a6d7f
Cheng, Jun
ca33437f-59cb-42fb-a1a8-83b76a252ac2

Zhang, Enlou, Chang, Jie, Sun, Weiwei, Cao, Yanmin, Langdon, Peter and Cheng, Jun (2018) Potential forcings of summer temperature variability of the southeastern Tibetan Plateau in the past 12 ka. Journal of Asian Earth Sciences, 159, 34-41. (doi:10.1016/j.jseaes.2018.03.023).

Record type: Article

Abstract

Investigating potential forcing mechanisms of terrestrial summer temperature changes from the Asian summer monsoon influenced area is of importance to better understand the climate variability in these densely populated regions. The results of spectral and wavelet analyses of the published chironomid reconstructed mean July temperature data from Tiancai Lake on the SE Tibetan Plateau are presented. The evidence of solar forcing of the summer temperature variability from the site on centennial timescales where key solar periodicities (at 855 ± 40, 465 ± 40, 315 ± 40 and 165 ± 40 year) are revealed. By using a band-pass filter, coherent fluctuations were found in the strength of Asian summer monsoon, Northern Hemisphere high latitude climate and high elevation mid-latitude (26°N) terrestrial temperatures with solar sunspot cycles since about 7.6 ka. The two abrupt cooling events detected from the Tiancai Lake record, centered at ∼9.7 and 3.5 ka were examined respectively. Coupled with the paleoclimate modeling results, the early Holocene event (9.7 ka) is possibly linked to an ocean-atmospheric feedback mechanism whereas the latter event (3.5 ka) may be more directly related to external forcing.

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More information

Accepted/In Press date: 20 March 2018
e-pub ahead of print date: 21 March 2018
Published date: 15 June 2018
Keywords: Asian summer monsoon, External forcing, Solar cycles, Southeast Tibetan Plateau, Terrestrial summer temperatures

Identifiers

Local EPrints ID: 422424
URI: http://eprints.soton.ac.uk/id/eprint/422424
ISSN: 1367-9120
PURE UUID: 01780a66-7aab-4b49-9908-95419b215a50
ORCID for Peter Langdon: ORCID iD orcid.org/0000-0003-2724-2643

Catalogue record

Date deposited: 23 Jul 2018 16:31
Last modified: 29 Oct 2022 01:36

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Contributors

Author: Enlou Zhang
Author: Jie Chang
Author: Weiwei Sun
Author: Yanmin Cao
Author: Peter Langdon ORCID iD
Author: Jun Cheng

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