GEO 121 10th Edition Lecture 15 Outline of Last Lecture I. Earth as a Planeta. Mechanicsb. Solstices and EquinoxesOutline of Current Lecture II. Moisture, Clouds, and Precipitationa. Normal Lapse Rateb. Dry Adiabatic Lapse Rate c. Wet Adiabatic Lapse Rated. Absolute Humiditye. Relative HumidityIII. Precipitation Causing Conditions Current Lecture1. Moisture, Clouds, and Precipitationa. Normal (environmental) Lapse Ratei. Decrease in temperature with altitude under normal atmospheric conditions; 6.5°C/1,000 m or 3.6°F/1,000 fb. Dry Adiabatic Lapse Ratei. 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/1,000fb. Wet Adiabatic Lapse Ratei. 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 fd. Absolute Humidityi. Mass of water vapor per unit volume of air expressed as g/m3 or g/f3 (Cubed) b. Relative Humidityi. Ratio between the amount of water vapor in the air and the maximum amount of water vapor the air can holdb. Latent Heat of Vaporizationi. Amount of heat absorbed by water to evaporate from the surface; 590 calories of heat/1g of waterb. Latent Heat of Condensationi. Energy released in the form of heat as water is converted from gas to liquidThese 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. Convectionali. Lifing associated with excessive radiation ex: equatorial lowii. Precipitation resulting from condensation of water vapor in an air mass that is rising as it's heatedb. Orographici. Windward side and leeward sideb. Frontali. Lifing associated with warm front and cold front air mass flow ex: American mid-westii. Precipitation resulting from condensation of water vapor by the rising of warmer, lighter air above cooler, denser air along a frontal
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