1Saturation of Moist Air• Clausius-Clapeyron equation at dew point€ vv=RvTp€ dpp=LlvRvT2dTd ln p =LlvRvT2dTd ln pdT=LlvRvT2Clausius Clapeyron• Recall by integration between two temperatureswe hadDewpoint and Humidity• Integrating from ambient to saturation• Dew point depression (T-TD)INCORRECT!Figure is wrong.1.00.80.60.40.20.0Relative Humidity20151050Dewpoint Depression (T-Td) T=2C T=24C T=46CCumulus Cloud BaseAltitude Calculatorhttp://www.csgnetwork.com/estcloudbasecalc.html Cloud Base Altitude = ((((temperature - dew point) / 4.5) *1000) + measure station altitude)Assumes:-The rate at which air cools as it rises is averaged at 5.5°F per1000 feet-The dew point also decreases at about 1.0°F over the samedistance.2Lecture Ch. 6b• Moist adiabatic ascent of air• Equivalent temperature• Aerological diagramsCurry and Webster, Ch. 6For Tuesday: Read Ch. 7 (look at but don’t solve Prob. 3)Equivalent Potential Temperature• Accounts for liquid water heatinga.k.a. Stuve
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