Fluid Modelling Of Atmospheric Dispersion In The Convective Boundary Layer |
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| Authors: | William H Snyder Robert E Lawson Jr Michael S Shipman Jie Lu |
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| Institution: | (1) Atmospheric Sciences Modeling Division, Air Resources Laboratory, National Oceanic and Atmospheric Administration, Research Triangle Park, NC 27711, U.S.A;(2) Geophex, Ltd., Raleigh, NC 27603, U.S.A;(3) Department of Meteorology, The Pennsylvania State University, University Park, PA 16802, U.S.A |
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| Abstract: | A laboratory convection tank has been established following thepioneering work of Willis and Deardorff, but with many improvements and enhancements thattake advantage of modern technology. The main emphasis in the current design was toprovide the ability to conduct a virtually unlimited number of realizations under essentiallyidentical conditions in order to obtain reliable statistics on the dispersion of plumes and puffsreleased within the simulated atmospheric convective boundary layer. Described herein is the tankitself and its auxiliary systems, including a laser-induced-fluorescence and video-imaging system for makingnon-intrusive, full-field measurements of concentrations, and the interfacing of varioussubsystems with a master controller that automates essentially all operation and measurement functions.The current system provides unprecedented resolution, control, and data volumes. Exampleresults are presented from two types of releases: continuous plumes and instantaneous puffs.These data sets clearly show penetration of the highly buoyant plumes and puffs into theinversion above the convective boundary layer, gravity spreading within the inversion, andrapid diffusion within the mixed layer. They also show extreme `spottiness' in the instantaneousconcentration cross-sections. |
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| Keywords: | Atmospheric dispersion Buoyant plumes Buoyant puffs Convection tank Convective boundary layer Laboratory simulations |
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