Huascaran δ18O as an indicator of tropical climate during the Last Glacial Maximum

Details Huascaran δ18O as an indicator of tropical climate during the Last Glacial Maximum Huascaran δ18O as an indicator of tropical climate during the Last Glacial Maximum

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1345p&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 9, p. 1345-1348

Physics

26

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Geochemistry: Isotopic Composition/Chemistry, Global Change: Atmosphere, Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

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.

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