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Monday, March 7, 2011
Monday, March 7, 2011
Monday, March 7, 2011
Monday, March 7, 2011
Monday, March 7, 2011
Monday, March 7, 2011
Ramzi Touchan University of Arizona
Photograph: Ramzi TouchanMonday, March 7, 2011
Dendroclimatology in Algeria
Photograph: Ramzi TouchanMonday, March 7, 2011
Source: Ramzi Touchan, University of ArizonaMonday, March 7, 2011
Monday, March 7, 2011
ENVIRONMENTALQUESTIONS
Monday, March 7, 2011
forest fires
floods
earthquakes
rising temperatures
insect ecologywater quantity
Monday, March 7, 2011
CLIMATERECONSTRUCTION
Monday, March 7, 2011
Source: Hughes and Funkhouser, 1998
tree rings
rain gauges
empirical comparisons between tree-ring and climate data
Monday, March 7, 2011
Ring-width index
correlation coefficients as a measure of climate signal
Monday, March 7, 2011
Correlation functions illustrating assocations between tree growth and climate
Monday, March 7, 2011
‘Reconstructing climate’ based on statistical associations
Monday, March 7, 2011
R E C O N S T R U C T I N G T E M P E R AT U R E
Monday, March 7, 2011
2010 Jan-Aug temperature anomaly h"p://www.giss.nasa.gov/Monday, March 7, 2011
Photograph: MariannaMonday, March 7, 2011
NASA global temperature record h"p://www.giss.nasa.gov/Monday, March 7, 2011
Temperature-sensitive trees Northeastern AlaskaMonday, March 7, 2011
Monday, March 7, 2011
Brian Luckman University of Western Ontario
Monday, March 7, 2011
St. George, S., and Luckman, B.H. 2001. Extracting a paleotemperature record from Picea engelmannii treeline sites in the central Canadian Rockies. Canadian Journal of Forest Research 31, 457-470.
Monday, March 7, 2011
Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
THE PRINCIPLE OF ECOLOGICAL AMPLITUDEA tree species may grow and reproduce over a certain range of habitats; that range is described as its ecological amplitude. Trees that grow near the margins or limits of their ecological amplitude are o!en sensitive to changes in their environment.
Monday, March 7, 2011
Monday, March 7, 2011
empirical comparisons
Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
“HIGH”and
“LOW”FREQUENCY
Monday, March 7, 2011
Photograph: Gigi TagliapietraMonday, March 7, 2011
Photograph: protographer23
“HIGH” FREQUENCY
Monday, March 7, 2011
Photograph: Phil Moore
“LOW” FREQUENCY
Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
CORRELATIONFUNCTION
Monday, March 7, 2011
Monday, March 7, 2011
Monday, March 7, 2011
Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
Source: St. George and Luckman, 2001
most sites
Monday, March 7, 2011
Source: St. George and Luckman, 2001
most sites
furthestnorth
Monday, March 7, 2011
Source: St. George and Luckman, 2001
most sites
‘oddball’ site
furthestnorth
Monday, March 7, 2011
LINEARREGRESSION
Monday, March 7, 2011
Source: St. George and Luckman, 2001Monday, March 7, 2011
Source: D’Arrigo et al., 2006Monday, March 7, 2011
Source: D’Arrigo et al., 2006Monday, March 7, 2011
Source: Osborne and Briffa, 2006Monday, March 7, 2011
Source: Osborne and Briffa, 2006Monday, March 7, 2011
LINEARREGRESSION
Monday, March 7, 2011
Source: Intergovernmental Panel on Climate Change, 2007Monday, March 7, 2011
Photograph: Mark AnbinderMonday, March 7, 2011
SURFACE TEMPERATURERECONSTRUCTIONSFOR THE LAST 2 ,000 YEARS
NATIONAL RESEARCH COUNCILOF THE NATIONAL ACADEMIES
Monday, March 7, 2011
the ‘divergence problem’ is defined as the tendency for tree growth at some previously temperature-limited northern sites to demonstrate a weakening in mean temperature response in recent decades.
Source: D’Arrigo et al., 2008Monday, March 7, 2011
Source: D’Arrigo et al., 2008Monday, March 7, 2011
“Trees are not thermometers or rain gagues.” Keith Briffa and colleagues
Monday, March 7, 2011
Source: D’Arrigo et al., 2008Monday, March 7, 2011
Monday, March 7, 2011
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