Mathematics – Logic
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3405714p&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 5, CiteID L05714
Mathematics
Logic
3
Global Change: Impacts Of Global Change (1225), Biogeosciences: Ecosystems, Structure And Dynamics (4815), Atmospheric Processes: Paleoclimatology (0473, 4900), Geographic Location: Arctic Region (0718, 4207), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513)
Scientific paper
A number of contemporary dendroecological studies from northwestern North America have highlighted a divergence in growth trends during recent decades. These studies suggest that warmer temperatures are now exceeding the physiological threshold of some northern tree species, or perhaps are contributing to increased drought stress as current precipitation is insufficient to offset increasing water demands under warmer conditions. Here we document additional evidence of these diverging growth trends from the Mackenzie Delta region of Canada and show they are anomalous to the twentieth century. Using wavelet coherency analyses we demonstrate that our white spruce tree ring chronologies exhibit little divergence from one another during the past four centuries, but coherency of the data-sets rapidly break down after the 1930s.
Carey Sean K.
Kokelj Steven V.
Pisaric Michael F. J.
Youngblut Donald
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