This document discusses using tree ring data to study drought history on the Canadian Prairies. It finds that prairie tree rings principally track summer precipitation and drought. The tree ring records show that droughts in the 1720s and 1780s were particularly severe, worse than anything in the last 100 years of instrumental records. Pacific Ocean influences on prairie climate are relatively weak.
14. Regional tree growth and
inferred summer climate in the
Winnipeg River basin, Canada
since AD 1783
Scott St. George
David Meko
Mike Evans
in press, Quaternary Research
15. The tree-ring record of summer
drought in the Canadian Prairies
Scott St. George
David Meko Greg Pederson
Martin-Phillippe Girardin David Sauchyn
Glen MacDonald Jacques Tardif
Erik Nielsen Emma Watson
Submitted to the Journal of Climate, January 2008
21. Vaganov-Shashkin model of
tree-ring formation
Gr(t) = g E (t) • min[g T (t), g W (t)]
Total Solar radiation Temperature Water balance
growth rate growth rate growth rate growth rate
22. INPUT Daily climate
data
MODEL Vaganov-Shashkin
model
Synthetic
OUT Daily growth
rates
Cell
characteristics
ringwidth
chronologies
23. INPUT Daily climate
data
MODEL Vaganov-Shashkin
model
Synthetic
OUT Daily growth
rates
Cell
characteristics
ringwidth
chronologies