GEO 121 10th Edition Lecture 15 Outline of Last Lecture I Earth as a Planet a Mechanics b Solstices and Equinoxes Outline of Current Lecture II Moisture Clouds and Precipitation a Normal Lapse Rate b Dry Adiabatic Lapse Rate c Wet Adiabatic Lapse Rate d Absolute Humidity e Relative Humidity III Precipitation Causing Conditions Current Lecture 1 Moisture Clouds and Precipitation a Normal environmental Lapse Rate i Decrease in temperature with altitude under normal atmospheric conditions 6 5 C 1 000 m or 3 6 F 1 000 f b Dry Adiabatic Lapse Rate i The rate at which a rising mass of air is cooled by expansion when no condensation is occurring 10 C 1 000 m or 5 6 F 1 000f b Wet Adiabatic Lapse Rate i Rate at which a rising mass of air is cooled by expansion when condensation is present 5 C 1 000 m or 3 2 F 1 000 f d Absolute Humidity i Mass of water vapor per unit volume of air expressed as g m3 or g f3 Cubed b Relative Humidity i Ratio between the amount of water vapor in the air and the maximum amount of water vapor the air can hold b Latent Heat of Vaporization i Amount of heat absorbed by water to evaporate from the surface 590 calories of heat 1g of water b Latent Heat of Condensation i Energy released in the form of heat as water is converted from gas to liquid These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 2 Precipitation Causing Conditions a Convectional i Lifing associated with excessive radiation ex equatorial low ii Precipitation resulting from condensation of water vapor in an air mass that is rising as it s heated b Orographic i Windward side and leeward side b Frontal i Lifing associated with warm front and cold front air mass flow ex American mid west ii Precipitation resulting from condensation of water vapor by the rising of warmer lighter air above cooler denser air along a frontal boundary
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