midterm 2 notes for aos101

midterm 2 notes for aos101 - AOS 101 Midterm 2 Notes...

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AOS 101 Midterm 2 Notes 10/17/11 Buoyancy- thought of as the ability to float o Positively buoyant-floats o Negatively buoyant-sinks Floating and sinking depends of on whether the object has less/more than an equal volume of fluid that gets displaced If the volume of displaced whatever has mass, and a log does too; if the mass of the log is less than the mass of the displaced whatever, the log will float Since density is not easy to measure, but temperature is…we can describe buoyancy in terms of comparing temperatures Stability- the measure of the likelihood that a physical system will remain unchanged after it is perturbed Stability in the atmosphere refers to the likelihood that a parcel will: o Return to its origin (stable) o Accelerate away from its origin (unstable) o Be at equilibrium with its environment (neutral) Key- compare a parcel of the environment into which it is lifted 10/21/11 If a parcel is saturated it cools at 6 degrees per km and if it is unsaturated it cools at 10 degrees per km If it is warmer than surroundings, it will continue to rise (unstable, positively buoyant) o Check temperature compared to surroundings o See if it is warmer or colder o Classify as stable or unstable o Look at temperature of dry/moist o Compare to see if parcel is warmer or colder o See if it will sink or rise Stability- First determine the environmental lapse rate at a given elevation from surrounding. Then: o Absolutely stable- environmental lapse rate is less than 6 degrees C per 1000 m o Conditionally stable- environmental lapse rate is less then 10 degrees C per 1000 m but greater than 6 degrees C per 1000 m Stability depends on whether a parcel is saturated Stable-few clouds, light cumulus humilus, clear sky, often no level of free convection Shallow/moderately deep layer of conditional instability- cumulus congestus, patchy clouds, breezy Deep layer of conditional instability- cumulonimbus, thunderstorms, maybe severe weather
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Single Cell Thunderstorms - Life cycle of a SCT has 3 distinct stages o Cumulus parcels ascend in the updraft and get saturated at the lifting condensation level (LCL), which makes cloud base o Mature begins when precipitation starting falling; this is the time of most lighting, rain, and hail, also the downdraft develops with cooling due to evaporating rain o Dissipating is when the updraft weakens and the downdraft dominates So how can a thunderstorm grow in intensity? o
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This note was uploaded on 03/06/2012 for the course AOS 101 taught by Professor Mark during the Fall '08 term at Wisconsin.

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midterm 2 notes for aos101 - AOS 101 Midterm 2 Notes...

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