Air-Ice-Ocean Feedback Mechanisms and Ice Oscillation on Millennial Time Scales
Air-ice-ocean feedback mechanisms, which are not conventionally incorporated within either climate or glacial models, are investigated to illustrate their potential role in generating ice advance/retreat on the time scale of 10(3) - 10(4) years; i.e. for examining the internal causes for the ice osc...
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Format: | Text |
Language: | English |
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1990
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Online Access: | http://www.dtic.mil/docs/citations/ADA480185 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA480185 |
Summary: | Air-ice-ocean feedback mechanisms, which are not conventionally incorporated within either climate or glacial models, are investigated to illustrate their potential role in generating ice advance/retreat on the time scale of 10(3) - 10(4) years; i.e. for examining the internal causes for the ice oscillation. Three main feedback loops are found from a coupled air-ice-ocean model developed in this paper; (a) ice advance - lower air temperature - ice freezing - ice advance; and (b) ice advance - higher ocean temperature - ice melting - ice retreat; (c) ice advance/retreat - modification of evaporation rate - change of ice accumulation rate and sea-level height - ice advance/retreat. The relative strength of the three feedback mechanisms determines the characteristics of the modes; growing or decaying, oscillatory or nonoscillatory. The solutions show the generation of growing oscillatory modes with the time scale of 10(3) - 10(4) years in certain parameter ranges. Pub. Annals of Glaciology, v14, p28-31, 1990. |
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