GEOG 141 Lecture Notes - Lecture 8: Lifted Condensation Level, Cloud Condensation Nuclei, Dew Point
5 Feb 2018
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Iclicker question 1: a as we increase temperature, we decrease relative humidity. Cooling rate changes from dry adiabatic lapse rate to. Lifting condensation level: where elevation comes into play and they shift from dry adiabatic lapse rate to saturated. Adiabatic warming always occurs at dry adiabatic lapse rate. Altitude at which dew point temperature is reached as air mass cools. Air parcel cannot hold as much water vapor. Made up of moisture droplets and/or ice particles. Air must contain particles to serve as condensation nuclei. Water can remain in liquid state below freezing. Relative humidity has to be 100% for there to be a cloud. Water requires non-gaseous surface to transition from vapor to liquid. Condensation nuclei are microscopic particles: dust, ash, salt, pollutants. Precipitation occurs when raindrops grow to a size at which they can no longer be held aloft. Two ways to form precipitation: ice-crystal process water freezes around nuclei, coalescence process.
