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Andean Snowline Evidence for Cooler Subtropics at the Last Glacial Maximum

  • Geoffrey O. Seltzer
Part of the NATO ASI Series book series (volume 22)

Abstract

A common perception exists that glacier snowlines were depressed about 1000 m in American alpine regions during the Last Glacial Maximum (dated in marine sediments between 23 and 14 kyr BP by the δ18O proxy for ice volume) as a result of a temperature reduction equivalent to a lapse rate of 5°–6°C/km (e.g. Broecker and Denton, 1989). This contradicts reconstructions of sea-surface temperatures that are <2°C cooler in low-latitude regions (CLIMAP, 1981; Webster and Streten, 1978; Rind andPeteet, 1985; Rind, 1990). In this work I show that snowlines were not uniformily depressed 1000 m in the Andean sub tropics and the revised estimates of temperature reduction are closer to the CLIMAP findings. However, glaciation in the tropical-subtropical latitudes of the Americas probably culminated twice during the late Pleistocene, more than 20 kyr BP and just prior to deglaciation about 14 kyr BP, making a direct comparison of the snowline evidence to the CLIMAP findings potentially misleading.

Keywords

Glacial Maximum Quaternary Research Quaternary Science Review Eastern Cordillera Bulk Organic Matter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1994

Authors and Affiliations

  • Geoffrey O. Seltzer
    • 1
  1. 1.Byrd Polar Research CenterThe Ohio State UniversityColumbusUSA

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