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EESA09H3 (185)

Lecture 2

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Environmental Science
Tanzina Mohsin

Lecture 2: Global Wind Circulation Vertical Structure of the Atmosphere 4 layers: o Troposphere o Stratosphere o Mesosphere o Thermosphere Wind Primer What is wind? Movement of air in an ordered fashion Cannot see, but can feel the effect of wind What causes air to move o Always moving from high to low pressure o Called gradient pressure force o Difference in air pressure, vertical or horizontal o Differences in pressure forms a pressure gradient o If differences is greater between the isobars, the pressure gradient is weaker Coriolis force o Due to rotation of earth o The fictitious force due to rotation of earth o In NH causes a deflection of wind to the right of motion, to the left in the SH o Formulated by Gaspard Coriolis in 1835, described by George Hadley o At equator, no coriolis force o Coriolis force increases as latitude increases Summary facts: o PGF always directed from higher to lower pressure o Steep PG indicate strong PGF and high winds
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