Nonlinear climatic sensitivity to greenhouse gases over past 4 glacial/interglacial cycles.

Lo, Li and Chang, S-P and Wei, K-Y and Lee, S-Y and Ou, T-H and Chen, Y-C and Chuang, C-K and Mii, H-S and Burr, GS and Chen, M-T and Tung, Y-H and Tsai, M-C and Hodell, D. A. and Shen, C-C (2017) Nonlinear climatic sensitivity to greenhouse gases over past 4 glacial/interglacial cycles. Scientific Reports, 7. p. 4626. ISSN 2045-2322, ESSN: 2045-2322 DOI https://doi.org/10.1038/s41598-017-04031-x

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Official URL: https://www.ncbi.nlm.nih.gov/pubmed/28676721

Abstract

The paleoclimatic sensitivity to atmospheric greenhouse gases (GHGs) has recently been suggested to be nonlinear, however a GHG threshold value associated with deglaciation remains uncertain. Here, we combine a new sea surface temperature record spanning the last 360,000 years from the southern Western Pacific Warm Pool with records from five previous studies in the equatorial Pacific to document the nonlinear relationship between climatic sensitivity and GHG levels over the past four glacial/interglacial cycles. The sensitivity of the responses to GHG concentrations rises dramatically by a factor of 2-4 at atmospheric CO2 levels of >220 ppm. Our results suggest that the equatorial Pacific acts as a nonlinear amplifier that allows global climate to transition from deglacial to full interglacial conditions once atmospheric CO2 levels reach threshold levels.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA73; Sylvia
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Scientific Reports
Volume: 7
Page Range: p. 4626
Identification Number: https://doi.org/10.1038/s41598-017-04031-x
Depositing User: Sarah Humbert
Date Deposited: 01 Oct 2017 21:27
Last Modified: 01 Oct 2017 21:27
URI: http://eprints.esc.cam.ac.uk/id/eprint/4061

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