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- W2034193178 abstract "Ice, land and deep-sea cores have provided strong evidence that orbital perturbations are of primary importance in the timing of the waxing and waning of Pleistocene continental ice sheets. Spectral analyses of climatic records have shown that, at least near the frequencies of variation in obliquity and precession, a considerable fraction of the climate variance is driven in some way by insolation changes accompanying changes in the Earth's orbit. The exceptional strength of the dominating 100,000-year cycle needs a non-linear amplification of the eccentricity-precession cycles from the ice sheets themselves and related mechanisms. Now that the astronomical model has passed both severe statistical tests and some tests of physical plausibility, the influence of orbital variations is thought to be real enough to be tested with numerical climate models. In addition to the calculation of the Earth's climate which is in equilibrium with a particular insolation pattern and boundary conditions, the simulation of the transient response of the climate system to orbital variations is important since it will lead to better understanding of the physical mechanisms involved in the relationship between the astronomical forcing and climate. It has been suggested that the time evolution of the latitudinal distribution of the seasonal pattern of insolation is the key factor driving the climate system on the 1000-year time scale. In this paper, a 2.5-D time-dependent climate model taking into account the feedbacks between the atmosphere, the upper ocean, the sea ice, the ice sheets and the lithosphere, is used to confirm this thesis. The model results produce long-term variations of the global ice volume over the past 125,000 years that are in general agreement with the most recent geological reconstructions. A comparison with the sea-level curve of Chappell and Shackleton and with the δ18O curve of Duplessy-Labeyrie-Blanc shows that our early stage 3 is a few thousands of years younger than dated by Chappell and Shackleton, and our stage 3 high-sea level itself is 20 meters lower than their value (i.e., 50 m below present sea level instead of 30 m)." @default.
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- W2034193178 date "1990-10-01" @default.
- W2034193178 modified "2023-10-16" @default.
- W2034193178 title "Testing the astronomical theory with a coupled climate—ice-sheet model" @default.
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- W2034193178 doi "https://doi.org/10.1016/0031-0182(90)90055-c" @default.
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