GGR112H5 Lecture Notes - Lecture 7: Atmospheric Circulation, Secondary Circulation, Barometer
Document Summary
Ggr112 lecture 7 atmosphere and ocean. Air pressure and its measurements: mercury barometer, aneroid barometer. Wind: description and measurement: wind, anemometer, wind vane. Definition of wind: the horizontal/vertical motion of air molecules from one location to another, wind is named for its direction it blows, wind is driven by gravity, pressure gradient force, sin of earth, friction force. Solid lines on a map are called isobars linking points of equal pressure. Dashed lines are isotherms linking equal temperature. Gravity: relentless force of gravity pulls air molecules towards earth. 2: descend and diverge clockwise (north hemisphere) or counterclockwise (southern hem. , antarctic high is stronger than arctic high. Is an irregular and concentrated band of westerly wind. Are weak during summer and strong in winter. Driven by local pressure gradient between land and water, caused by thermal contrast. Driven by local pressure gradient due to thermal contrast. Driven by the seasonal migration of the itcz.
