Climatic Inferences from Dendroecological Reconstructions - Dendroclimatology - page 285

Fig. 9.13 Fire frequency changes in Patagonia, Argentina, and the southwestern United States.
Both regional composites from fire-scar networks show reduced fire frequency during the 1780s-
1840s period ( vertical shaded bar ) (Kitzberger et al. 2001 ) . The dashed and solid lines show
'moving' fire frequencies, computed as the sum of fire events that were synchronously recorded
by the indicated numbers or percentage of sites within the networks during 49-year windows, plot-
ted on the central (25th) year of the window (reprinted from Global Ecology and Biogeography ,
permission granted from Wiley-Blackwell)

across western North America, extending from southern British Columbia to north-
ern Mexico, Kitzberger et al. ( 2007 ) showed that the most coherent regional signal
in the fire-scar dataset was well correlated with ENSO (Pearson r <

0.001, between the first principal component of the 238 series and the D'Arrigo et al.
[ 2005 ] reconstruction of the Niño-3 sea surface temperature index). An independent

=− 0.47, p