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      The Milankovitch astronomical theory of paleoclimates: A modern review

      Vistas in Astronomy
      Elsevier BV

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          Long-Term Variations of Daily Insolation and Quaternary Climatic Changes

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            The surface of the ice-age Earth.

            (1976)
            In the Northern Hemisphere the 18,000 B.P. world differed strikingly from the present in the huge land-based ice sheets, reaching approximately 3 km in thickness, and in a dramatic increase in the extent of pack ice and marine-based ice sheets. In the Southern Hemisphere the most striking contrast was the greater extent of sea ice. On land, grasslands, steppes, and deserts spread at the expense of forests. This change in vegetation, together with extensive areas of permanent ice and sandy outwash plains, caused an increase in global surface albedo over modern values. Sea level was lower by at least 85 m. The 18,000 B.P. oceans were characterized by: (i) marked steepening of thermal gradients along polar frontal systems, particularly in the North Atlantic and Antarctic; (ii) an equatorward displacement of polar frontal systems; (iii) general cooling of most surface waters, with a global average of -2.3 degrees C; (iv) increased cooling and up-welling along equatorial divergences in the Pacific and Atlantic; (v) low temperatures extending equatorward along the western coast of Africa, Australia, and South America, indicating increased upwelling and advection of cool waters; and (vi) nearly stable positions and temperatures of the central gyres in the subtropical Atlantic, Pacific, and Indian oceans.
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              Pleistocene Temperatures

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                Author and article information

                Journal
                Vistas in Astronomy
                Vistas in Astronomy
                Elsevier BV
                00836656
                January 1980
                January 1980
                : 24
                :
                : 103-122
                Article
                10.1016/0083-6656(80)90026-4
                0c331132-0127-4d8a-93cf-0ca77ae2b3ca
                © 1980

                http://www.elsevier.com/tdm/userlicense/1.0/

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