A GCM-based analysis of circulation controls on δ18O in the southwest Yukon, Canada: Implications for climate reconstructions in the region

Details A GCM-based analysis of circulation controls on δ18O in the southwest Yukon, Canada: Implications for climate reconstructions in the region A GCM-based analysis of circulation controls on δ18O in the southwest Yukon, Canada: Implications for climate reconstructions in the region

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3705706f&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 5, CiteID L05706

Mathematics

Logic

1

Atmospheric Processes: Paleoclimatology (0473, 4900), Oceanography: Biological And Chemical: Stable Isotopes (0454, 1041), Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Precipitation (1854)

Scientific paper

To improve our understanding of paleoclimatic records in the southwest Yukon, we examined controls on precipitation δ18O using an isotopically-equipped atmospheric general circulation model (GCM). Our results show that, particularly during the cool-season, elevated δ18O is associated with a deeper Aleutian Low and stronger southerly moisture flow, while lower δ18O is associated with the opposite meteorological conditions. These results suggest that the large mid-19th century shift towards lower δ18O 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.

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