Potential analysis reveals changing number of climate states during the last 60 kyr

• Main Authors: Livina, VN, Kwasniok, F, Lenton, TM
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: 2009
• Subjects: Greenland; Dansgaard-Oeschger events; ice core
• Online Access: https://ueaeprints.uea.ac.uk/id/eprint/24270/

We develop and apply a new statistical method of potential analysis for detecting the number of states of a geophysical system, from its recorded time series. Estimation of the degree of a polynomial potential allows us to derive the number of potential wells in a system. The method correctly detects changes in the number of wells in artificial data. In ice-core proxy records of Greenland paleotemperature, a reduction in the number of climate states from two to one is detected sometime prior to the last glacial maximum (LGM), 23-19 kyr BP. This bifurcation can be interpreted as loss of stability of the warm interstadial state of the Dansgaard-Oeschger events. In data spanning the last glacial termination, up to four climate states are detected, plausibly representing the LGM, Bolling-Allerod, Younger Dryas, and the Holocene. The proposed method can be applied to a wide range of geophysical time series exhibiting bifurcations.