Geol. 105 Notes 6

Geol. 105 Notes 6 - -how do we chart climate change?:...

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-how do we chart climate change?: -observations related to climate change: evidence from ice and vegetation, ocean and continental sediments, sea level variations, coral deposits, speleothems (cave deposits), oxygen isotopes -oxygen isotopes-normal contains 8 protons and neutrons, two isotopes of oxygen are O18 (heavy), and O16 (normal), during a local warm period the relative amount of O18 will increase in the ocean water since more O16 is evaporating, during global cool periods O16 is stored in polar ice caps and worldwide O18 is increased, ration of O16 to O18 in the past can give clues about global temps., ice cores from glaciers can also give you similar info. -proxy-something that is used to represent something else (delta O18 is proxy for global temps.) -diatoms-little critters on ocean floor that pile up over the year, they store info. of CO2 and salt in the oceans -dendrochronology-tree ring dating (thinner rings show that a year was tougher climate wise) -speleothems-cave deposits, bands of them are measured for their O18 composition -coral reefs-sensitive to sea level changes as well as temperature change -Milankovitch-scientist who noticed that patters of climate change correlated with astronomical positions -eccentricity-changes in shape of orbit (100000 year cycle)
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Geol. 105 Notes 6 - -how do we chart climate change?:...

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