Orbital forcing of the inception of the Laurentide ice sheet?

Statistics – Computation

Scientific paper

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Atmospheric Circulation, Climatology, Glaciology, Insolation, Atmospheric Models, Boundary Conditions, Boundary Value Problems, Computerized Simulation, Paleoclimatology, Parameterization, Solar Orbits

Scientific paper

A low-resolution spectral atmospheric general-circulation model is used to simulate two annual cycles under the orbitally determined insolation conditions of 125,000 and 115,000 years ago, corresponding to the beginning and end of the last interglacial optimum. The theoretical bases and numerical-computation techniques of the model are discussed. Initial boundary conditions other than insolation were the same for each simulation and based on present values. Comparison of the results reveals increased precipitation and a 2-K annual mean cooling over Canada for 115,000 years ago, conditions which would favor the extension of permanent snow cover over Labrador and could trigger the formation of the Laurentide ice sheet. Hence these simulations support the astronomical theory of paleoclimates.

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