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Cool tropical temperatures shift the global δ 18 O‐T relationship: An explanation for the ice core δ 18 O ‐ borehole thermometry conflict?
Author(s) -
Boyle Edward A.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl00081
Subject(s) - ice core , holocene , borehole , climatology , geology , last glacial maximum , atmospheric sciences , paleoclimatology , climate change , oceanography , paleontology
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 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 18 O/ΔT (LGM‐Holocene) of −0.37 ‰/°C is determined with a simple graphical technique.