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Cool tropical temperatures shift the global δ18O-T relationship: An explanation for the ice core δ18O - Borehole thermometry conflict?

Geophysical Research Letters (1997) 24(3) 273-276
DOI: 10.1029/97GL00081
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Abstract

The discrepancy between central Greenland borehole temperatures and the isotopic composition of Last Glacial Maximum ice can be explained by a shift in the δ18O-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=Δδ18O/ΔT (LGM-Holocene) of -0.37 /°C is determined with a simple graphical technique.

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Boyle, E. A. (1997). Cool tropical temperatures shift the global δ18O-T relationship: An explanation for the ice core δ18O - Borehole thermometry conflict? Geophysical Research Letters, 24(3), 273–276. https://doi.org/10.1029/97GL00081

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