GEOG3839.23, Frontiers in dendrochronology
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GEOG3839.23, Frontiers in dendrochronology

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GEOG3839.23, Frontiers in dendrochronology GEOG3839.23, Frontiers in dendrochronology Presentation Transcript

  • FRONTIERS IN DENDROCHRONOLOGYPhotograph: Nestor Jarquin
  • 755 m 3/s847 m 3/s809 m 3/s770 m 3/s823 m 3/s787 m 3/s901 m 3/s
  • empirical comparisons
  • Ring-width index
  • THEDIVERGENCE PROBLEM
  • “ [L]inear empirical–statistical analyses alone cannot be used to prove a physical or biological mechanism for variability or ” change in the climate-tree growth relationship. Anchukaitis et al., Geophysical Research Le ers, 2007
  • Vaganov et al., In Dendroclimatology, 2010
  • Vaganov-Shashkin model of tree-ring formationGr(t) = g E (t) • min[g T (t), g W (t)]Total Solar radiation Temperature Water balancegrowth rate growth rate growth rate growth rate
  • Upper Sapawe Region Northwestern Ontario
  • Tracking changes in limiting factor through the growing season
  • Tracking changes in limiting factor through the growing season
  • Tracking changes in limiting factor through the growing season
  • Tracking changes in limiting factor through the growing season
  • Photograph: Conrad Bakker
  • Observed and simulated tree ring-width in southern RussiaSource: Evans et al., Journal of Geophysical Research, 2006
  • Anchukaitis et al., Geophysical Research Le ers, 2007
  • empirical comparisons
  • “ This [modeling approach] would represent a significant step toward validating and improving statistically based but ultimately subjective data standardization techniques ” and identifying decadal climate variability reliably. Evans et al., Journal of Geophysical Research, 2006
  • There are relatively few long high-resolution terrestrial proxies from the tropics
  • nispiro (Sapotaceae) Monteverde, Costa Rica eastern white pine (Pinaceae) Deep Gap, North CarolinaPhotograph: Kevin Anchukaitis
  • Photograph: Abdalla Mohamed Abdi
  • “[Establish] a strategy to develop chronometric estimates intropical trees lacking demonstrably annual ring structure, using ”high resolution stable isotopic measurements in tropical woods. Evans and Schrag 2004, GCA, 68, 16
  • O 16 O 18
  • Stable isotopes of oxygen O 18 0.2% O 17 0.04% O 16 99.76%
  • δO18 in precipitation Li le O18 Lots of O18Source: Bowen and Wilkinson, Geology, 2002
  • Monteverde Cloud Forest, Costa RicaSource: Kevin Anchukaitis
  • Source: Kevin Anchukaitis
  • Photograph: Denise Jesudason Cloud forest Monteverde, Costa Rica
  • -5‰ -1 ‰ δO“more negative” 18 “more positive” δO 18 = “light” = “heavy” = “depleted” = “enriched”
  • PINE NEEDLEleaf stomata
  • PINE NEEDLEleaf stomata
  • LEAF CROSS-SECTIONabundant water
  • CO2 CO2 LEAF CROSS-SECTION abundant water
  • CO2 CO2 H2O H2O LEAF CROSS-SECTION abundant water
  • LEAF CROSS-SECTIONwater shortage
  • CO2 CO2 CO2CO2 CO2 CO2 CO2 CO2 H2O H2OH2O H2O H2O LEAF CROSS-SECTION water shortage
  • Source: Kevin Anchukaitis
  • Photograph: Kevin Anchukaitis
  • nispiro (Sapotaceae) Monteverde, Costa Rica eastern white pine (Pinaceae) Deep Gap, North CarolinaPhotograph: Kevin Anchukaitis
  • Photograph: Todd Vanderlin
  • Source: Anchukaitis et al., Journal of Geophysical Research, 2008
  • Source: Anchukaitis et al., Journal of Geophysical Research, 2008
  • 3 TREES 16 YEARS1200δ018 MEASUREMENTS
  • FINAL EXAM May 10 @ 4PM 105 Blegen
  • Photograph: Nevada Tourism Media Relations
  • Reconstructed annual flow of the Colorado River at Lees Ferry[Meko and Woodhouse, 2010]
  • Fire-scar chronologies in the Gila WIlderness, New Mexico[Swetnam and Brown, 2010]
  • INTRODUCTION TO DENDROCHRONOLOGY
  • 52
  • Photograph: Joe Mabel
  • Photograph: daveynin
  • Tree-ring display at elementary school Photograph:Tom Swetnam
  • Ed Cook Lamont-Doherty Earth Observatory
  • “Tree-ring analysis is one of the most powerful tools available forthe study of environmental change and the identification of ”fundamental relationships between tree growth and climate. Cook and Pederson, 2010
  • DENDROCHRONOLOGY IS MUCH MORE THAN JUSTCOUNTING TREE RINGS.