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

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 CO...

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Bibliographic Details
Main Authors: Li, XS, Berger, A, Loutre, MF, Maslin, MA, Haug, GH, Tiedemann, R
Format: Article in Journal/Newspaper
Language:English
Published: AMER GEOPHYSICAL UNION 1998
Subjects:
Last glacial cycle
Ice sheet model
Insolation
Co2
Ice Sheet
Online Access:https://discovery.ucl.ac.uk/id/eprint/101379/1/98GL00443.pdf
https://discovery.ucl.ac.uk/id/eprint/101379/
Description
Summary: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.

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