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Simulating late Pliocene northern hemisphere climate with the LLN 2-D model

Li, XS; Berger, A; Loutre, MF; Maslin, MA; Haug, GH; Tiedemann, R; (1998) Simulating late Pliocene northern hemisphere climate with the LLN 2-D model. Geophysical Research Letters , 25 (6) 915 - 918. 10.1029/98GL00443. Green open access

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Abstract

Deep-sea sediment records suggest Northern Hemisphere glaciation intensified at approximately 2.75 Ma. In this paper we simulate the fluctuations of the late Pliocene Northern Hemisphere ice-sheets volume using the LLN 2-D model, forced by the astronomically derived insolation and by scenarios of CO2 concentrations. The model simulates the waxing and waning of the Northern Hemisphere ice volume in an acceptable agreement with geological reconstructions and in particular supports the geological evidence that the development of significant Northern Hemisphere ice sheets started between 2.75 and 2.55 Ma, a time interval accompanied by quite high and stable eccentricity values, and increased obliquity amplitude. When the CO2 concentration is lower than a threshold value, the Milankovitch forcing explains the suddenness and specific timing of this entrance into the Ice Age during the late Pliocene.

Type: Article
Title: Simulating late Pliocene northern hemisphere climate with the LLN 2-D model
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/98GL00443
Publisher version: http://dx.doi.org/10.1029/98GL00443
Language: English
Additional information: Copyright 1998 by the American Geophysical Union. A correction to this article was published in Geophysical Research Letters, Vol. 25, No. 14, p. 2719, 1998, http://dx.doi.org/10.1029/98GL01935
Keywords: Last glacial cycle, Ice sheet model, Insolation, Co2
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/101379
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