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GEOG5839.01. Introduction to Dendrochronology
 

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 ...

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 GEOG5839.01. Introduction to Dendrochronology Presentation Transcript

    • GEOG5839 INTRODUCTION TO DENDRO CHRONOLOGY
    • 2012 Mar-May temperature anomaly h p://www.giss.nasa.gov/
    • QUESTIONIs it unusual for the world to be this warm?
    • Low reservoirSource: Glen MacDonald
    • QUESTIONIs there enough water in the Colorado River to satisfy the expected need?
    • Source: Howard Arno
    • QUESTIONWhen were these dwellings constructed (and abandoned) and why?
    • QUESTIONHow does weather and climate affectthe risk and severity of forest fires?
    • Source: U.S. Coast Guard, Lt. Brendan Evans
    • QUESTION How often do natural hazards like floods occur,and what factors make them more or less likely?
    • “ 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
    • “ There is nothing magical about the last one hundred years. Dr. Balaji Rajagopalan University of Colorado ”
    • 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
    • Tree at ChancellorsvilleSource: Andy Frasse o
    • Tree-ring display at elementary schoolSource: Tom Swetnam
    • DENDROCHRONOLOGY ISMUCH MORE THAN JUST COUNTING TREE RINGS.
    • “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
    • Source: Baillie (1982)
    • Source: Lane Johnson
    • Source: Lane Johnson
    • 27St.. George and Nielsen, The Holocene, 2003
    • Giant sequoia 3,266 yearsSource: Julie Jordan Sco
    • Intermountain bristlecone pine 4,844 yearsSource: Tom Harlan
    • The Seward Oak 330 years?Source: Ralph Sievert
    • Eastern white cedar (in Minnesota) 560 yearsSource: Danny Margoles
    • “ 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
    • INTRODUCTION TO DENDROCHRONOLOGY
    • GEOG5839 MAJOR TOPICS
    • The science of dendrochronology uses informationencoded into the annual growth rings of trees toaddress issues related to climate change, hazards,ecology and natural history.
    • September 6What are tree rings?
    • September 18 How does weather affect tree growth?Source: Paul Schulte
    • September 20 The principle of cross-datingh p://esp.cr.usgs.gov/data/atlas/li le/
    • The Longest Tree-Ring Record In The Americas. 8,500 Years
    • October 23The history of dendrochronology
    • October 18Sampling strategies
    • October 16Dendroarcheology
    • November 6 DendroecologySource: Whitney Crawford
    • November 8 DendrogeomorphologySource: Erica Bigio
    • GEOG5839LABORATORY ACTIVITIES
    • Exercise Tree anatomySource: Fritz Schweingruber
    • Exercise(s)Cross-dating
    • ExerciseSignal processing
    • GEOG5839 ABOUT ME
    • GEOG5839COURSE STRUCTURE
    • 25% In-class discussionLaboratory exercises 30% 40% Project and final report Final exercise 5%
    • GEOG3839 XT C L AS S NESource: Fri s Schweingruber