Huascaran δ18O as an indicator of tropical climate during the Last Glacial Maximum
- 1 May 1999
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 26 (9) , 1345-1348
- https://doi.org/10.1029/1999gl900183
Abstract
The interpretation of the isotopic composition of Andes tropical mountain glaciers is reconsidered using a simple Rayleigh distillation model. It is shown that Andes snowline depression and Huascaran ice core δ18O are consistent with a 3°C drop in sea surface temperature during the Last Glacial Maximum, accompanied by an increase from 40% at present to 60% during the LGM in the annual mean proportion of atmospheric water lost to continental runoff. Broecker's interpretation of Huascaran δ18O as a paleo‐hygrometer is discussed.Keywords
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