The surface of the ice-age Earth

Science
CLIMAP Project Members

Abstract

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...Continue Reading

Citations

Mar 1, 1996·American Journal of Physical Anthropology·T Hanihara
Sep 1, 1981·Behavioural Brain Research·B L Finlay, D R Sengelaub
Oct 1, 1994·Trends in Ecology & Evolution·M B Davis
Jul 1, 1997·Bulletin of the Medical Library Association·B F Schloman
Apr 1, 1997·Comptes rendus de l'Académie des sciences. Série III, Sciences de la vie·L ChikhiF Bonhomme
Sep 13, 2002·Nature·Kurt LambeckEmma-Kate Potter
Nov 15, 2007·Proceedings. Biological Sciences·Grant R BiggPhillip Williamson
Jun 20, 2006·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·G W EvattN R J Hulton
Sep 27, 2008·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Luke Skinner
Jun 1, 2002·Evolution; International Journal of Organic Evolution·Matthew P HareStephen R Palumbi
Jun 19, 2010·Science·Timothy HerbertZhonghui Liu
Feb 19, 2011·Annual Review of Marine Science·Wolfgang H Berger
Feb 18, 2016·Nature Communications·Alan M HaywoodAisling M Dolan
Jun 29, 2012·Ecology Letters·Moriaki YasuharaDanielle K Stoll
Mar 16, 2016·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Isabel S FentonAndy Purvis
Oct 1, 2015·Biological Reviews of the Cambridge Philosophical Society·Moriaki YasuharaBoris Worm
Jan 1, 1994·Environmental Pollution·M B McElroy
Nov 1, 2000·Nature·D M Sigman, E A Boyle
Aug 13, 2004·Proceedings. Biological Sciences·Amit Huppert, Andrew R Solow
Mar 28, 2002·Proceedings. Biological Sciences·J A ToddP Jung
Jun 14, 2003·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Michal Kucera, K Darling
Jun 24, 2004·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Sharon A CowlingSteven A Spall
Sep 3, 2004·Evolution; International Journal of Organic Evolution·Katja T C A PeijnenburgSteph B J Menken
Jan 5, 2018·Nature·Rachel H R Stanley
Feb 1, 1990·Evolution; International Journal of Organic Evolution·Ira J RopsonDennis A Powers
Aug 1, 1994·Evolution; International Journal of Organic Evolution·Xiao-Ru Wang, Alfred E Szmidt
Jan 1, 2018·Nature·Rachel H R Stanley
Aug 28, 2020·Nature·Jessica E TierneyChristopher J Poulsen
Dec 1, 1994·Evolution; International Journal of Organic Evolution·Michael E Hellberg
Dec 1, 1991·Evolution; International Journal of Organic Evolution·Stephen R Palumbi, Bailey D Kessing
Feb 1, 2017·Science Advances·Shannon E LoomisMeredith A Kelly

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