Lecture7_GEOG1400

Cooling due to pressure changes how does it relate to

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Unformatted text preview: g due to pressure changes. How does it relate to us? How does it relate to us? Atmospheric pressure decreases with Atmospheric pressure decreases with an an increase in altitude Dry adiabatic lapse rate Dry adiabatic lapse rate DALR DALR - 10°C per 1000 m (1.0°C / 100 1000 (1 100 m) m) of vertical rise. If a mass of air is raised 1 km, its temperature will drop it by 10°C. 10° This is the dry rate because This is the “dry” rate because condensation condensation does not occur FIGURE 11.4 Environmental lapse rate conditions for a mass of stationary air (shown in blue) that surrounds an individual parcel of air (shown in white) rising through it. Saturated Adiabatic Lapse Rate Saturated Adiabatic Lapse Rate SALR: SALR: or (Wet adiabatic la lapse rate) ranges from 4 to 9°C per 1000 m. 9° It is variable because it It is variable because it depends depends on the temperature and pressure of the air and its moisture of the air and its moisture content. content. SALR Temperature of of rising air drops 5°C/1000 m DALR Temperature of rising air drops 10°C/1000 m For For most situations, can (Modified from University of Maryland) use a value of 5°C/1000 m 5° COOLING COOLING BUT RELEASE OF LATENT HEAT SLOWS THE COOLING PROCESS Szeto et al. 2007 Summary Summary Water and The Global Perspective Water and The Global Perspective Humidity Humidity The Adiabatic Process The Adiabatic Process DALR DALR SALR...
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This document was uploaded on 04/11/2014.

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