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Lecture 14

ATMO 201 Lecture Notes - Lecture 14: Net Force, Atmospheric Pressure, Jet Stream


Department
Atmospheric Sciences
Course Code
ATMO 201
Professor
Timothy Logan
Lecture
14

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Lecture 14
Thursday, March 9, 2017
3:52 PM
Atmospheric Dynamics
The power of wind - wind blows from HIGH to LOW
oTransport energy (heat), moisture, momentum
Continuity - account for wind in three dimensions
oZonal direction (u) - east/west (latitudinal)
oMeridional direction (v) - north/south (longitudinal)
oVertical direction (w) - "up" or "down"
Dimensions of motion
oZonal and meridional winds typically move much faster than vertical
winds
Motion is based on Newtonian mechanics
of=ma (which law is this???)
Horizontal pressure changes and wind
Atmospheric pressure always DECREASES with height
oRapid in the first few kilometers then gradually until the top of the
atmosphere
oBut that’s vertical, what about horizontal changes?
oModel this:
Main assumptions
Air molecules have same size and weight
Density is constant with height; no crowding at surface
Width of the column is the same at all levels
Air stays inside column
oTwin City Model: Bryan (city 1) and college station (city 2)
On the day of a football game, everyone is in college station
and no one is in Bryan. So City 1 cools and City 2 gets hotter
Wind moves from the H to the L, so there is wind movement
(aka air circulation)
Wind always goes from H to L
L is always at the top of the cold column and an H is always at
the top of the warm column
There are updrafts and downdrafts
find more resources at oneclass.com
find more resources at oneclass.com
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