Physics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3216708z&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 16, CiteID L16708
Physics
3
Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Abrupt/Rapid Climate Change (4901, 8408), Atmospheric Processes: Paleoclimatology (0473, 4900), Geographic Location: North America
Scientific paper
The identification of past climatic extremes and norms is important for a better understanding of the climate systems and the way they change. Here we present an almost continuous tree-ring and climate record from Vancouver Island, Canada for the last four millennia from Douglas-fir trees (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) that are sensitive to precipitation variation. Spring droughts more severe than that of the mid-1920s occurred in the late 1840s, mid-1460s AD, and ~ mid-1860s BC. A remarkable climatic anomaly occurred in ~ the 19th century BC during which strong pentadecadal oscillation prevailed and radial growth decreased by 71% in four years. This event could have been the final stage in the process of climatic and environmental transition beginning 2-3 centuries earlier that led to major cultural transformation in regions sensitive to climate change.
Hebda Richard J.
Zhang Qi-Bin
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