Abstract
Our aim is to investigate, by means of a G.C.M., what can be the primary response of the atmosphere to the anomalies in the distribution of incident solar radiation by latitude and season introduced by the secular variations of the Earth’s orbital elements (other boundary conditions being specified).
For such a sensitivity study we have chosen to simulate the annual cycle of climate at 125 000 years BP and 115 000 years BP, for which the insolation signatures computed at I.A.G. (Louvain-la-Neuve) are markedly different from the present one (perihelion in July and January with high eccentricity), whereas the surface boundary conditions can be reasonably assumed, similar to present ones (last interglacial).
The model used for this experiment is the 10-level sigma-coordinate primitive equations, global spectral model developped at E.E.R.M. (Paris) with a computational grid of 20x32 points. Its physical parameterizations include a simplified radiative scheme with diurnal variation of insolation, interactive cloudiness based on relative humidity, detailed hydrologic cycle and surface processes with computation of soil temperature, water content and snow cover.
We have compared two simulations of a complete annual cycle performed with the insolation parameters corresponding respectively to 125 kyr and to 115 kyr BP under identical seasonally varying boundary conditions (SST, albedo) specified according to actual climatology. Differences between the statistics of the two experiments show a characteristic response of the atmospheric temperatures and circulation to the insolation anomaly.
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Royer, J.F., Deque, M., Pestiaux, P. (1984). A Sensitivity Experiment to Astronomical Forcing with a Spectral GCM: Simulation of the Annual Cycle at 125 000 BP and 115 000 BP. In: Berger, A., Imbrie, J., Hays, J., Kukla, G., Saltzman, B. (eds) Milankovitch and Climate. NATO ASI Series, vol 126. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-4841-4_20
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DOI: https://doi.org/10.1007/978-94-017-4841-4_20
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