1!Lecture Ch. 6a!• Saturation of moist air!• Relationship between humidity and dewpoint!– Clausius-Clapeyron equation!• Dewpoint!– Temperature!– Depression!• Isobaric cooling!Curry and Webster, Ch. 6!For Wednesday: Homework, Ch. 6, Prob. 4, 6; Read Ch. 7!How does saturation occur?!• By increasing water vapor!– Evaporation of water at surface!– Evaporation of falling rain!• By cooling!– Isobaric!– Radiative cooling of rising air!• By mixing of two unsaturated air parcels!Curry and Webster, Ch. 6!Saturation of Moist Air!• Dew point temperature!Curry and Webster, Ch. 6!Saturation of Moist Air!• Clausius-Clapeyron equation at dew point!€ dpp=LlvRvT2dTd ln p =LlvRvT2dTd ln pdT=LlvRvT2€ vv=RvTpClausius Clapeyron!• Recall by integration between two temperatures we had!2!Dewpoint 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 Base "Altitude Calculator!http://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 per 1000 feet -The dew point also decreases at about 1.0°F over the same distance. Lecture Ch. 6b!• Moist adiabatic ascent of air!• Equivalent temperature!• Aerological diagrams!Curry and Webster, Ch. 6!For Tuesday: Read Ch. 7 (look at but don’t solve Prob. 3)!Equivalent Potential Temperature!• Accounts for liquid water heating!3!a.k.a. Stuve diagram!Cloud in a Jar
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