Geography 2152F/G Lecture 6:
6 Dec 2018
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Document Summary
The climate system: climate is a function of the interaction of many spheres", atmosphere: gases, hydrosphere: oceans, large bodies of water, lithosphere: plate tectonics, orogeny (plate form mountain ranges, cryosphere: glaciers, ice sheets, snow cover. The last glacial period: all of canada was covered with ice 18,000 years ago (except for northern yukon, lower sea levels at that time exposed the bering land bridge. Global average temperature trend: every location with human populations have warmed up (even in the poles ) There are four general causes: variations in solar radiations, changes in composition of the atmosphere (from humans, changes in the earth"s surface, variations in the earth orbit. Ice cores: the width of an ice layer provides insight on the temperature and snowfall of that year, each year a new layer of ice forms, bubbles of air are trapped in the ice.
