Atmospheric Circulation Patterns During Glacial Inception

Models of atmospheric circulation in the North Atlantic sector during glacial inception can be expanded to a hemispheric scale with the aid of diagnostic studies of the present climate. The present “Greenland Above” (GA) atmospheric circulation type may be a candidate for the atmospheric circulation type required during glacial inception. The pattern is an amplification, with only minor phase shifts, of the present average winter circulation pattern in the extratropical Northern Hemisphere. Southerly flow in the northwest Atlantic is associated with warm ocean temperatures, low sea ice in the Davis Strait, and increased precipitation over northeast Canada. Evidence from modeling of the present climate indicates that the GA pattern could be maintained by increased snow cover over eastern North America. Enhanced snow cover, due to decreased Northern Hemisphere summer insolation, could cause a similar response on an ice-age time scale.

Atmospheric Circulation · Climatology · Extratropical cyclone · Geography · Geomorphology · Glacial period · Meteorology · Northern Hemisphere · Ocean current · Precipitation · Sea ice · Snow · Cryospheric studies and observations · Geology · Geology and Paleoclimatology Research · Methane Hydrates and Related Phenomena · Oceanography

• Meteorological perspective on the initiation of the Laurentide Ice Sheet

  Open Access•David H Bromwich, E Richard Toracinta et al.•Quaternary International•2002

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• A positive climatic feedback mechanism for Himalayan glaciation

  Open Access•Andrew B G Bush•Quaternary International•2000

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• Atmospheric Circulation during the Last Ice Age

  Open Access•H H Lamb, Adrian Woodroffe•Quaternary Research•1970

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• Oceanic Evidence for the Mechanism of Rapid Northern Hemisphere Glaciation

  Open Access•William F Ruddiman, Andrew Mcintyre et al.•Quaternary Research•1980

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• Background of a Geophysical Model of the Initiation of the Next Glaciation

  Open Access•Hermann Flohn•Quaternary Research•1974

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• Multiple Deglaciations of the Hudson Bay Lowlands, Canada, Since Deposition of the Missinaibi (Last-Integlacial?) Formation

  Open Access•John T Andrews, W W Shilts et al.•Quaternary Research•1983

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• Variations in Climate Since 1602 as Reconstructed from Tree Rings

  Open Access•Harold C Fritts, G Robert Lofgren et al.•Quaternary Research•1979

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• Growth rate of the Laurentide Ice Sheet and sea Level Lowering (with Emphasis on the 115,000 BP Sea Level Low)

  Open Access•John T Andrews, M A W Mahaffy et al.•Quaternary Research•1976

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• Climate of the American Tropics and Subtropics in the 1960s and Possible Comparisons With Climatic Variations of the Last Millenium

  Open Access•W A Sanchez, John E Kutzbach•Quaternary Research•1974

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• Ice-Sheet Initiation and Climatic Influences of Expanded Snow Cover in Arctic Canada

  Open Access•Larry D Williams•Quaternary Research•1978

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• Long-Term Variations of Caloric Insolation Resulting from the Earth's Orbital Elements

  Open Access•André Berger, André L Berger•Quaternary Research•1978

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