Atmospheric Dispersion

Atmospheric Dispersion - Reading: Chap 3.1 Atmospheric...

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08/12/09 1 Atmospheric Dispersion & Transport Overview Wind Turbulence Ambient Stability & Inversion Plume Rise and Transport Plume Characteristics Long Range Transport Planetary Transport Reading: Chap 3.1
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08/12/09 2 The Atmosphere as a Sink Volcanoes and pollutants from other natural sources Pollutants from human activities From the discovery of the utility of fire to the present Imperfect sink: limited ability to carry away ( transport ), dilute ( dispersion ) and remove (deposition ) pollutants Local or regional overloading Topographical barriers Scale of air motion Atmospheric stability and inversion Atmospheric chemical reactions Example?
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08/12/09 3 Dispersion and Transport Transport - air motions carry pollutants from one region of the atmosphere to another Dispersion - mixing of pollutants with air Planetary Boundary Layer (PBL) : Pollutants are initially released into PBL PBL well mixed in the context of a few months In shorter time scales pollutant mixing limited by atmospheric conditions Air in Free Troposphere above the PBL is relative stable What’s the depth of PBL?
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08/12/09 4 Scale of Air Motion
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08/12/09 5 Wind Affected by: Horizontal pressure gradients Horizontal temperature gradients Friction related to surface roughness What are the two components in describing wind? Fig 3.1 Maximum height of wind profiles indicate where effects of surface roughness end and where gradient wind begins
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08/12/09 6 Wind Effect of wind on emission: dilution of plume Doubling of the wind speed decreases pollutant levels by 50 % Is wind speed measured at the ground level? Is wind dilution mor effective in urban area or countryside? Wind Direction Prevailing flows (Anti-)Cyclonic flows Effects of topography In a valley Along sea and lake coasts www.infomonitors.com/ Meteorological Station
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08/12/09 7 Wind in a Valley What is the wind direction at night? During the day?
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08/12/09 8 Sea/Land Breeze and Circulation http://ess.geology.ufl.edu/ess/Notes/AtmosphericCirculation/daynight_lg.jpeg What is the wind direction at night? During the day? Will sea breeze continue inland for a long distance?
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08/12/09 9 Wind Rose Wind speed and direction are typically quite variable 164/720 = 23% 16/720 = 2.2%, 24/720 = 3.3%, 70/720 = 9.7%
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08/12/09 10 Valley Land-Sea
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08/12/09 11 Monthly Wind Rose of Gainesville What is the major wind direction in Gainesville?
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This note was uploaded on 09/11/2011 for the course ENV 4101 taught by Professor Wu during the Spring '08 term at University of Florida.

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Atmospheric Dispersion - Reading: Chap 3.1 Atmospheric...

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