EAS100 Lecture Notes - Lecture 25: Cool Air, Dew Point, Puffy Amiyumi

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Pressure-gradient force drop in air pressure per unit of distance: 2. Coriolis force deviation from a straight line of the path of a moving body as a result of earth"s rotation: 3. Friction resistance to movement that results when 2 bodies are in contact: pressure-gradient force, places of equal air pressure are shown on weather maps by lines called isobars. Isobars close together show a steep gradient, far apart show a low gradient: coriolis force, friction: Interactions: the 3 effects interact such that winds around a low-pressure centre develop an inward spiral motion (convergence, cyclone), winds around a high-pressure centre develop an outward spiral motion (divergence, anticyclone). In northern hemisphere, convergent centres rotate counter-clockwise & divergent rotate clockwise (opposite for southern hemisphere). (a) updraft, clouds, rain. (b) downdraft, clear skies: global air circulation, air masses (enormous volumes of air driven by pressure-gradient force.

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