Meteorology Chapter 8 Notes
Meteorology Chapter 8 Notes MET 100
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This 3 page Class Notes was uploaded by Kasandra Guyette on Saturday October 17, 2015. The Class Notes belongs to MET 100 at State University of New York at Oswego taught by Michael Veres (P) in Fall 2015. Since its upload, it has received 19 views. For similar materials see Meteorology in Meteorology at State University of New York at Oswego.
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Date Created: 10/17/15
Chapter 8 Air Pressure amp Winds Pressure and density 0 Pressure force per area 0 Density mass per volume Air pressure 0 Weight of overlying overhead air Decreases with increasing height Temp density and pressure Interrelated Temp increases moecues have more energy Molecules push farther from each other Sealevel pressure SLP Relative pressure between two locations on the surface and identify pressure system Upper air analysis 0 To analyze weather above surface meteorologists use maps of constant pressure isobaric Since surfaces are constant pressure we need another measure 0 Geopotential height very similar to elevation 0 Level above seal level that given pressure occurs Warmer air columns have greater heightsfor a particular pressure level 0 Differences in height serve as a proxy replacement for pressure 0 Ridge warm trough cold 0 Though they are similar there are differences between pressure and height Winds Results of an imbalance in pressures 0 High pressure air moves towards low pressure to retain equilibrium 0 No pressure imbalances no wind 0 In order to moveobject must have force 0 3 main forces 0 Pressure gradient force PGF 0 Coriolis effect CE 0 Friction Pressure gradient force 0 Only one that can start movement of air 0 PG Difference in pressuredistance Large pressure small difference high force PGF is strong winds blow faster PGF always oriented at right angle to isobar and moves high pressure to low Contours close to each other strong winds Coriolis effect Also known as Coriolis force Not a true force Only exists because wind blows on spherical rotating body Earth Cannot cause air to move Can only change direction of air Always acts at right angle to direction air is moving What is it c When air startsmoving it starts de ecting Direction of de iection 0 EM Northern hemisphere 0 Left Southern hemisphere Reason winds don39t blow straight CE greatest at poles disappears at equator De ection gets stronger the farther you go from the equator Geostropic winds 0 Away from surface combining Pressure amp Coriolis Winds around highs and lows lsobars and isoheights rarely straight Northern hemisphere o Counterclockwise cyclonic around low 0 Clockwise anticyclonic around high 0 Southern hemisphere o Clockwise cyclonic around low 0 Counterclockwise anticyclonic around high Surface winds 0 Near surface there s another force friction Friction acts to slow air 0 Weakens Coriolis o PGF amp CE not in balance 0 Result winds blow into low pressure out of high pressure Winds and vertical motion 0 At surface winds blows out of high into low forced to rise 0 Causes divergence aloft 0 Causes clouds and rain 0 When air diverges from surface high pressure it allows air above to sink 0 High pressure clear skies
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