CU-Boulder ATOC 1050 - ATOCbooknotes (16 pages)

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ATOCbooknotes



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ATOCbooknotes

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Pages:
16
School:
University of Colorado at Boulder
Course:
Atoc 1050 - Weather and the Atmosphere
Weather and the Atmosphere Documents

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1 Sarah Rose Book Notes Chapter 6 Storms contain rapidly rising air known as convection Stability determines the location and intensity of convection storms An Air Parcel is a distinct blob of air we will imagine we can identify as it moves through the atmosphere Stable if the parcel is displaced vertically it will return to its original position Neutral if the parcel displaced vertically it will remain in its new position Unstable if the parcel is displaced vertically it will accelerate away upward or downward form its original position Adiabatic Process is one in which a parcel of air does not mix with its environment or exchange heat energy with its environment A balloon who s skin does not permit the exchange of mass energy Compression heats the air bicycle pump heats up when you compress air Decompressing air cools as it expands aerosol spray coming out of a can Air parcels rising through the atmosphere will expand as they rise because they encounter lower pressure Rising parcels cool because they must do work to expand The air parcel cools as it expands rises The air parcel warms as it compresses sinks Lapse Rate is the rate at which temperature decreases lapses with increasing altitude Dry Adiabatic Lapse Rate is 10 degrees C per Km 10 Km A rising air parcel will cool at a rate of 10degrees C per Km of ascent and a sinking air parcel will warm at the same rate What happens to a saturated air parcel as it rises 1 The air parcel will cool as it rises 2 Water vapor will condense as the parcel rises a cloud forms 3 As water vapor condenses latent heat is released 2 4 The latent heat that is released will offset some of the cooling that occurred as the air parcel rose the amount of latent heat released will vary but on average will offset about 4 deg C km of cooling Moist Adiabatic Lapse Rate is determine by considering the combination effects of expansion cooling and latent heating When clouds form water vapor condenses to liquid and latent heat warms the air in



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