ENV100Y5 Lecture Notes - Lecture 41: Ozone Depletion, Atmospheric Circulation, Photon
69
ENV100Y5 Full Course Notes
Verified Note
69 documents
Document Summary
Thin layer of gases that surrounds a planet or moon. Earth"s atmosphere: 78% n, 21% o, 1% other. 2nd most-variable = aerosols from a variety of sources. Vertical differences in temperature, density, and composition. Human activity is changing the composition of the. Measures the force per unit area produced by an overlying column of air. Temperature: 2 reasons for loss of temperature with altitude, lower atmosphere is warmed by conductance from the earth, as a parcel of air moves up it expands (lower pressure) and loses energy. Humidity: amount of vapour air can hold depends on temp saturated cold air has much less water than saturated warm air. Within troposphere, all three decline with increasing altitude. As altitude increases, there are fewer air molecules. Results in decreasing pressure, temperature, & humidity. Troposphere: 80% of all gases: tropopause limits mixing between troposphere and stratosphere.
