Cool tropical temperatures shift the global δ[superscript 18]O-T relationship: An explanation for the ice core δ[superscript 18]O- borehole thermometry conflict?

The discrepancy between central Greenland borehole temperatures and the isotopic composition of Last Glacial Maximum ice can be explained by a shift in the δ[superscript 18]O-T relationship for the hydrological cycle linked to cooler tropical temperatures. This concept is illustrated using a simple...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Author: Boyle, Edward A
Other Authors: Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union (AGU) 1996
Subjects:
Greenland
ice core
Online Access:http://hdl.handle.net/1721.1/106299
Description
Summary:The discrepancy between central Greenland borehole temperatures and the isotopic composition of Last Glacial Maximum ice can be explained by a shift in the δ[superscript 18]O-T relationship for the hydrological cycle linked to cooler tropical temperatures. This concept is illustrated using a simple Rayleigh distillation model. An estimate for α=Δδ[superscript 18] O/ΔT (LGM-Holocene) of −0.37 ‰/°C is determined with a simple graphical technique. National Science Foundation (U.S.) (Grant OCE9402198) United States. National Oceanic and Atmospheric Administration (Grant NA46GP0282)

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