6 Pressure-Fa09

6 Pressure-Fa09 - Apply what you have learned What can you...

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Miami, FL Apply what you have learned: What can you tell about the location where these temperature data are from? Low Latitude – Fiji 18 ° S
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How about this one? Anchorage, AK Dfasdf F °
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REVIEW: Pressure is the “weight of the atmosphere” --measured in millibars Today’s Topic: Pressure and Winds
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ISOBARS : Connect points of equal pressure
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What might cause of pressure variation across the surface of earth? 4 types surface pressure conditions: Thermal Lows and Highs Dynamic Lows and Highs
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“Thermal Low Pressure” caused by SURFACE HEATING. Warm air rises (convection) b/c it expands & becomes less dense than surrounding air; Creates a Thermal Low at surface
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Where might thermal low pressure occur on a very large scale?
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When air cools, it contracts, becomes denser than surrounding air and sinks, creates a Thermal High at surface “Thermal High Pressure” Where might that happen on a large scale? THE PolEs
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There are also “Dynamic” (moving) Highs & Lows (do not result from surface heating and cooling) more about them later…
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(I mean besides Taco Bell food…)
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1. Pressure gradient force is perpendicular to isobars Air flows from High to Low like water! Low High The 3 physical forces that act on wind: 1. Pressure Gradient Force 2. Coriolis Force (Effect) 3. Friction
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PGF Causes Air to Flow from HIGH LOW Profile View of PGF
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Spacing of isobars indicate strength of PGF
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This note was uploaded on 04/09/2010 for the course GEOG 1104 at Virginia Tech.

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6 Pressure-Fa09 - Apply what you have learned What can you...

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