CGRG Bibliography of Canadian Geomorphology
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Author : Field, R.D.; Moore, G.W.K.; Holdsworth, G.; and Schmidt, G.A.
Date : 2010.
Title : A GCM-based analysis of circulation controls on O18 in the southwest Yukon, Canada: Implications for climate reconstructions in the region.
Publication : Geophysical Research Letters
Issue : 37, L05706,
Page(s) : doi:10.1029/2009GL041408.
Abstract
To improve our understanding of paleoclimatic records in the southwest Yukon, we examined controls on precipitation d18O using an isotopically-equipped atmospheric general circulation model (GCM). Our results show that, particularly during the cool-season, elevated d18O is associated with a deeper Aleutian Low and stronger southerly moisture flow, while lower d18O is associated with the opposite meteorological conditions. These results suggest that the large mid-19th century shift towards lower d18O values seen in paleoclimate records from the region was associated with a shift towards a weaker Aleutian Low. While in disagreement with a previous interpretation of this shift, it is consistent with records of glacial advance and tree-ring growth during the same period, and observational studies of Aleutian Low controls on temperature and precipitation in the region.
Bibliography of Canadian Geomorphology