Moisture and clouds ch 19

Moisture and clouds ch 19 - Precipitation can only occur...

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Unformatted text preview: Precipitation can only occur when there is moisture in the air Humidity the amount of water vapor in the air Absolute humidity mass of water vapor in a given volume of air Capacity is temperature dependent warm air has a much greater capacity Relative humidity amount of water vapor relative to the amount the air can hold at a given temperature Ratio of the airs actual water vapor content compared with the amount of water vapor required for saturation at that temperature (and pressure) Actual content/possible maximum content Saturation when the relative humidity reaches 100% Dew point if saturated air cools below the point where saturation occurs, moisture will condense Supersaturation in particulate free air (high up), the relative humidity can go above 100% Supercooling water that remains liquid past its freezing point Warm air can hold more water vapor than cold air can. Relative humidity changes at constant temperature Relative humidity changes at constant water-vapor content Radiation cooling re-emission of heat from the ground, plants, water, etc. Contact cooling dew and frost Dew condensation cause by moist air contacting a cooler surface (below its dew point) Frost when that dew point is below freezing, the condensate is solid ice Cooling of rising air - adiabatic temperature change rising air expands expansion requires the molecules to expend energy...
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This note was uploaded on 02/15/2011 for the course ESC 1000 taught by Professor Staff during the Fall '08 term at University of Florida.

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Moisture and clouds ch 19 - Precipitation can only occur...

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