http://scholars.ntou.edu.tw/handle/123456789/9210
Title: | Nonlinear climatic sensitivity to greenhouse gases over past 4 glacial/interglacial cycles | Authors: | Lo, Li Chang, Sheng-Pu Wei, Kuo-Yen Lee, Shih-Yu Ou, Tsong-Hua Chen, Yi-Chi Chuang, Chih-Kai Mii, Horng-Sheng Burr, George S. Chen, Min-Te Tung, Ying-Hung Tsai, Meng-Chieh Hodell, David A. Shen, Chuan-Chou |
Keywords: | PACIFIC WARM POOL;SEA-SURFACE TEMPERATURE;CHRONOLOGY AICC2012;SOUTHERN-OCEAN;GLACIAL CYCLES;ANTARCTIC ICE;PATHWAYS;RECORD | Issue Date: | 4-Jul-2017 | Publisher: | NATURE PUBLISHING GROUP | Journal Volume: | 7 | Source: | SCI REP-UK | 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. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/9210 | ISSN: | 2045-2322 | DOI: | 10.1038/s41598-017-04031-x |
Appears in Collections: | 地球科學研究所 13 CLIMATE ACTION |
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