GEOG5839.01. Introduction to Dendrochronology

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Tree rings tell us much more than just a tree’s age. They also provide clues that help us understand how our environment has changed in the past, and provide insights into how key processes in atmosphere, biosphere and geological systems operate over long timescales.

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GEOG5839.01. Introduction to Dendrochronology

  1. 1. GEOG5839 INTRODUCTION TO DENDRO CHRONOLOGY
  2. 2. 2012 Mar-May temperature anomaly h p://www.giss.nasa.gov/
  3. 3. QUESTIONIs it unusual for the world to be this warm?
  4. 4. Low reservoirSource: Glen MacDonald
  5. 5. QUESTIONIs there enough water in the Colorado River to satisfy the expected need?
  6. 6. Source: Howard Arno
  7. 7. QUESTIONWhen were these dwellings constructed (and abandoned) and why?
  8. 8. QUESTIONHow does weather and climate affectthe risk and severity of forest fires?
  9. 9. Source: U.S. Coast Guard, Lt. Brendan Evans
  10. 10. QUESTION How often do natural hazards like floods occur,and what factors make them more or less likely?
  11. 11. “ Three li le words achingly familiar on the Western farmers tongue, rule life in the dust bowl of the continent – if it rains. Associated Press ” April 15, 1935
  12. 12. “ There is nothing magical about the last one hundred years. Dr. Balaji Rajagopalan University of Colorado ”
  13. 13. CLIMATE HISTORY OF NORTH AMERICA Younger Demise of Laurentide Dryas Ice Sheet 20 16 12 8 4 0 THOUSANDS OF YEARS AGO Final Drainage of Lake AgassizLAST GLACIAL MODERN MAXIMUM OBSERVATIONS
  14. 14. Tree at ChancellorsvilleSource: Andy Frasse o
  15. 15. Tree-ring display at elementary schoolSource: Tom Swetnam
  16. 16. DENDROCHRONOLOGY ISMUCH MORE THAN JUST COUNTING TREE RINGS.
  17. 17. “The trees composing the forest rejoice andlament with its successes and failures andcarry year by year something of its story intheir annual rings.” A. E. Douglass University of Arizona
  18. 18. Source: Baillie (1982)
  19. 19. Source: Lane Johnson
  20. 20. Source: Lane Johnson
  21. 21. 27St.. George and Nielsen, The Holocene, 2003
  22. 22. Giant sequoia 3,266 yearsSource: Julie Jordan Sco
  23. 23. Intermountain bristlecone pine 4,844 yearsSource: Tom Harlan
  24. 24. The Seward Oak 330 years?Source: Ralph Sievert
  25. 25. Eastern white cedar (in Minnesota) 560 yearsSource: Danny Margoles
  26. 26. “ Tree-ring analysis is one of the most powerful tools available for the study of environmental change and the identification of fundamental relationships ” between tree growth and climate. Ed Cook and Neil Pederson Lamont-Doherty Earth Observatory
  27. 27. INTRODUCTION TO DENDROCHRONOLOGY
  28. 28. GEOG5839 MAJOR TOPICS
  29. 29. The science of dendrochronology uses informationencoded into the annual growth rings of trees toaddress issues related to climate change, hazards,ecology and natural history.
  30. 30. September 6What are tree rings?
  31. 31. September 18 How does weather affect tree growth?Source: Paul Schulte
  32. 32. September 20 The principle of cross-datingh p://esp.cr.usgs.gov/data/atlas/li le/
  33. 33. The Longest Tree-Ring Record In The Americas. 8,500 Years
  34. 34. October 23The history of dendrochronology
  35. 35. October 18Sampling strategies
  36. 36. October 16Dendroarcheology
  37. 37. November 6 DendroecologySource: Whitney Crawford
  38. 38. November 8 DendrogeomorphologySource: Erica Bigio
  39. 39. GEOG5839LABORATORY ACTIVITIES
  40. 40. Exercise Tree anatomySource: Fritz Schweingruber
  41. 41. Exercise(s)Cross-dating
  42. 42. ExerciseSignal processing
  43. 43. GEOG5839 ABOUT ME
  44. 44. GEOG5839COURSE STRUCTURE
  45. 45. 25% In-class discussionLaboratory exercises 30% 40% Project and final report Final exercise 5%
  46. 46. GEOG3839 XT C L AS S NESource: Fri s Schweingruber
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