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AOSC200Lect23 - AOSC 200 Lesson 23 DETECTING CLIMATE CHANGE...

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AOSC 200 Lesson 23
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DETECTING CLIMATE CHANGE DIFFICULT TO DETECT CLIMATE CHANGE EXCEPT OVER LONG PERIODS OF TIME. INSTRUMENTAL RECORDS GO BACK ONLY A COUPLE OF CENTURIES. THE FURTHER BACK, THE LESS RELIABLE ARE THE DATA. SCIENTISTS MUST DECIPHER CHANGES FROM INDIRECT EVIDENCE HISTORICAL DOCUMENTS TREE RINGS POLLEN RECORDS GLACIAL ICE – AIR BUBBLES AND DUST SEA-FLOOR, MATINE SEDIMENTS. OXYGEN ISOTOPE RATIOS IN FOSSIL SHELLS FOSSIL RECORDS
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Fig. 14-14, p. 422 Cave drawing from the Sahara Desert
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CLIMATE CLUES
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TREE RINGS In regions with distinct growing seasons, trees growth appears as distinct rings. Typically one ring per year. Dendrochronology Width of the ring is a function of available water, temperature, and solar radiation. Tree species have different responses to these three factors – hence the factors can be separated by looking at different species
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TREE RINGS
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Fig. 14-16, p. 423 Plot of annual precipitation in Iowa derived from the analysis of tree rings
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POLLEN RECORDS Pollen degrades slowly and each species can be identified by the shape of its pollen Radioactive carbon dating gives the age of the pollen.
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