Meteorology - Meteorology Study of the dynamics of the...

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9/13/11 Aerosol & Particulate 11 Meteorology Study of the dynamics of the atmosphere, including energy, mass and momentum transfer on a large scale Q: Why do we want to know meteorology? Energy balance on earth – absorption and loss by the earth and atmosphere Blackbody : An idealized physical body that absorbs all electromagnetic radiation falling on it. Because of its perfect absorptivity at all wavelengths, it is also the best possible emitter of thermal radiation, which it radiates incandescently in a characteristic, continuous spectrum that depends on the body's temperature. No reference to the color of the body
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9/13/11 Aerosol & Particulate 22 Solar Radiation Emission from a blackbody at 300 K, approximating the earth Solar spectrum and emission of a blackbody at 6000 K Seinfeld, 1986 Q: Conclusion drawn from the comparison of these two blackbodies?
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9/13/11 Aerosol & Particulate 33 Q: What are the features of the absorption spectrum? How do they affect the earth? What is the role of aerosol? Absorption Spectrum of Atmosphere
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9/13/11 Aerosol & Particulate 44 Overall Energy Balance for the Earth and Atmosphere Q: Is insolation on earth the same everywhere anytime?
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9/13/11 Aerosol & Particulate 55 Variation in insolation with different seasons Variation in insolation with geographic location Variation in atmospheric thickness traversed by solar radiation with angle of incidence Wark & Warner, 1981 Uneven heating
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9/13/11 Aerosol & Particulate 66 Role of Receptor The incident solar radiation absorbed at the earth’s surface is a function of the absorptivity of that surface – uneven heating Ex. Sea breeze, monsoon Q: During daytime, do we have sea breeze or land breeze? Why? Nevers, 2000
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9/13/11 Aerosol & Particulate 77 Temperature Change in the Troposphere First Law of Thermodynamics Barometric Equation g dZ dP ρ - = dP dT C dP dh p υ 1 - = - = 0 for adiabatic expansion p p C g dZ dT gdZ dP dT C - = - = = 1 Q: How much is dT/dZ if Cp = 100.34 m2/s2- K? What if Cp = 185.6? (for dry air and water) Lapse Rate
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9/13/11 Aerosol & Particulate 88 Atmosphere Zones & Vertical Temperatures Troposphere Lowest layer of atmosphere Temperature decreases with height on average – 6.5 oC/km Depth varies from 8-18 km Characterized by vertical and horizontal air motion; Location of all "weather" phenomena Characterized by 2 regions Planetary boundary layer(~ 1 km depth) Free troposphere Aerosol & Particulate Research Lab
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9/13/11 Aerosol & Particulate 99 Lapse Rate: Negative of the temperature gradient in the atmosphere Concept that describes (non-)movement of air near the surface Dry adiabatic lapse rate ( ) = 0.976 oC/100 m ~ 1 oC/100 m
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This note was uploaded on 09/11/2011 for the course ENV 6146 taught by Professor Staff during the Spring '11 term at University of Florida.

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Meteorology - Meteorology Study of the dynamics of the...

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