Tree Rings and Temperatures

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THE NEED FOR PROXY CLIMATE DATA Climate varies at all spatial and temporal scales Significant natural climate variability on decadal and longer timescales is not adequately captured by available instrumental records Need high resolution proxy climate / temperature records to document, understand and model this climate variability Proxy estimates of N. Hemisphere temperature for the last millennium ( Phil Jones) Instrumental temperature records (CRU)
Tree Rings Deliver • A precisely calendar dated chronology (sequence of rings) • A dating tool (crossdating) • Annually resolved environmental records – Temporal patterns (ringwidth, density, chemistry etc.) – Spatial patterns of environmental variables • Records of past damage to the tree (scars, reaction wood) Engelmann spruce scarred and tilted by Dome Glacier in 1846
Page 1: Tree rings and temperatures Brian L
Page 5 and 6: All series rigourously checked to e
Page 7 and 8: there is no change in the limiting
Page 9 and 10: Tree-ring Densitometry Precisely sa
Page 11 and 12: Negative exponential Linear negativ
Page 13 and 14: The Principle of Aggregate Tree Gro
Page 15 and 16: Long tree-ring chronologies and old
Page 17 and 18: Athabasca Glacier Maximum May-Augus
Page 19 and 20: Comparison with other Northern Hemi
Page 21 and 22: Northern Hemisphere densitometric c
Page 23 and 24: Annual maps show strong but regiona
Page 25 and 26: Interhemispheric Linkages ( tempera
Page 28 and 29: Comparison of three millennial leng
Page 30 and 31: Challenges basic assumptions of den
Page 32 and 33: 68-69°N, 18-28°E 65°N, 69°E 65
Page 34 and 35: Major droughts on the Canadian Prai
Page 36 and 37: Combining precipitation and tempera
Page 38 and 39: Take home messages trees are not th

Tree Rings and Temperatures

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