Ch4 (5)

# Ch4 (5) - Friction Air moving over the surface of the earth...

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Unformatted text preview: Friction Air moving over the surface of the earth experiences friction with the surface and that causes the wind speed to 3] ﬁub g 3005!) . . Friction is important only at or near the surface (in the layer from the surface to about 1.5 km) THIRD TOPIC: COMBINING THE FORCES Now that we know what the forces are that operate in the atmosphere, let’s apply this knowledge and see how these forces work together to produce winds. Consider a simple case where the isobars are oriented straight east to west on a weather map. If we neglect the effects of ﬁction for a moment and just look at how the pressure gradient force and the Coriolis force work together, we would discover the following: C00. Rod N\U\ \WL Egpooswc, warren. wﬂ'h 00:3? thcﬁon,+v\ex&, \$3 at mamea Wow Pew. «1 Wiohs, Note that the winds would be parallel to the isobars. N Now let’s look at what happens when the isobars are curved. \Olv I x A”. w‘“ Mf‘ //- 7? ﬁx), 0 mm" _/ -’ mu \ ,‘ (amt . W Anti H \e r»? E R— ‘3 - "’ tom ‘ t (C: ,’ 1.- ’T 1 and WON‘ \\ \— , , K/ / “\‘day‘s’sl‘l \lw; " S 5 The wind flows in a (L—SOCQ QV if . rsense around a 10, gg) y) L or spy. ,, , - ,u A, ,- A- ,__-__,ﬁ_ —— ﬁ_______-_________‘_,______ -——---- _Au____-- ~‘7"AA»—~-—————,A-~vv—~w-wnﬁﬁu—"HH ...
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