EOSC 112: THE FLUID EARTH. Atm12 Read: Kump et al. Chap.3, p. 44-45; Chap.4, p. 55-61. Objectives: To describe how atmospheric pressure and temperature vary with altitude; To explain why air moves; T o describe what sets the global atmosphere in motion ;
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ATMOSPHERIC STRUCTURE AND DYNAMICS
Unlike the other layers, it is subjected to constant vertical mixing (convection).
It is this mixing process, through rising thermals and moist convection (followed by release of latent heat), that carries heat energy from the ground to cloud levels where it is radiated to space in the form of infrared radiation.
=> radiation (or surface) inversion
=> very stable. Pollutants cannotdisperse upw.
Night time: cool air drains downhill, settling into valleys.
Temp. changes => Pressure changes => Winds
Surface air warms