LIFESCI 2H03 Lecture Notes - Lecture 1: Confidence Interval, Mount Pinatubo, Atmospheric Circulation
14 Oct 2014
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Document Summary
What are cliamte proxies climate archives that contain many indicators of past climate climate signals form these indicators is not direct, like reading temperature from a thermometer. E. g. : changes in ice sheet 18o. Records of recent climate change tree rings: high altitude regions, good indicator of temp. Caco3: levels in corals, tropical latitudes, deposited by seawater and recruited by coral to form their cells. Pollen in sediments: shifts in vegetation in different locations, can be adapted to warm or wet conditions. Base construction on abundance of certain vegetation. Plankton in the ocean indicate different temperatures, and the position of their shell, oxygen and carbon isotopes in the shells of plankton. Climate in the northern hemisphere the last 2000 years. Using different proxies thick band is average light is range of estimates. Wide range for the temperatures within this time frame cooler and warmer periods rapid increase in global temperatures.
