Atmospheric Humidity. Global water cycle: precipitation = evaporation. Phase changes of water (latent heat transfer). Humidity. Amount of water vapor in atmosphere Expressions of humidity: Specific humidity Relative humidity Dew Point. Specific humidity.
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max. capacity x 100
(“saturated air” means that RH = 100%)
a) If temperature = 20 °C and
actual sp. hum. is 7.5 g/kg, what is RH?
1. Use graph to find capacity amount.
2. RH = (7.5 / 15) x 100 = 50%
b) If temperature is 25 °C and actual sp. hum. is 5 g/kg, what is RH?
RH = (5/20) x 100 = 25%
dry bulb temp - wet bulb temp
Rising parcel will cool due to expansion
Descending parcel will warm due to compression
RATE depends on whether parcel is dry or wet (saturated)
* differs from environmental temperature lapse rate