Strong but Intermittent Spatial Covariations in Tropical Land Temperature

Yang, Hui; Piao, Shilong; Huntingford, Chris; Peng, Shushi; Ciais, Philippe; Chen, Anping; Zhou, Guiyun; Wang, Xuhui; Gao, Mengdi; Zscheischler, Jakob (2019). Strong but Intermittent Spatial Covariations in Tropical Land Temperature. Geophysical Research Letters, 46(1), pp. 356-364. American Geophysical Union 10.1029/2018GL080463

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Surface temperature variations across the tropics exhibit different levels of spatial coherence, yet this is poorly characterized. Years of high temperature anomalies occurring simultaneously across large geographical regions have the potential to adversely impact food production and societal well‐being. Using cluster analysis of correlations between extensive temperature measurements from the last six decades, we find a major change occurs in the late 1970s. Two spatial clusters merge to a single dominant one, and therefore, warmer years are experienced at the same time across most tropical land regions. Noting this change occurs at the same time as the Pacific Decadal Oscillation shifts a warm phase, we investigate this potential driver by a range of coupled ocean‐atmosphere‐land climate models. These simulations verify that stronger spatial tropical land temperature coherence tends to occur in Pacific Decadal Oscillation warm phases, although model differences exist in projections of how climate change may modulate this dependence.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Zscheischler, Jakob

Subjects:

500 Science > 530 Physics

ISSN:

0094-8276

Publisher:

American Geophysical Union

Funders:

[4] Swiss National Science Foundation

Projects:

[1295] New metrics for constraining multiple drivers of hazard and compound hazards Official URL

Language:

English

Submitter:

Jakob Zscheischler

Date Deposited:

25 Feb 2020 14:06

Last Modified:

25 Feb 2020 14:15

Publisher DOI:

10.1029/2018GL080463

BORIS DOI:

10.7892/boris.140023

URI:

https://boris.unibe.ch/id/eprint/140023

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