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Adiabatic heating/cooling

Adiabatic heating/cooling. Can be VERY significant near topographic barriers Warming with downslope flow Cooling with upslope flow. Downslope Warming. Large warming during downslope flow

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Adiabatic heating/cooling

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  1. Adiabatic heating/cooling • Can be VERY significant near topographic barriers • Warming with downslope flow • Cooling with upslope flow.

  2. Downslope Warming • Large warming during downslope flow • Often large over Cascade foothills (e.g., Cascades-North Bend), but apparent all over the world, including to the lee (east) of the Rockies--the Chinook Wind. • In Europe called the Foehn Wind. • Usually, air comes from mid-levels where potential temperature is higher than at the surface. A drop in dew point usually accompanies downslope flow.

  3. Brookings: The Classic Northwest Example

  4. Adiabatic cooling • Air escaping from bicycle tire • Exiting an aerosol can • Rising air in the atmosphere

  5. Adiabatic lapse rate • As we will see, with no moist processes, air warms by 9.8 C per km due to adiabatic compression and cools by the same rate. • Called the adiabatic lapse rate.

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