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CHARACTERIZING COLD AIR POOL DYNAMICS USING THERMAL IMAGERY

This presentation by Chris Johnson from The University of Utah details the methodology for characterizing cold air pool dynamics through thermal imagery. It covers the essential steps of filtering, georeferencing, and orthorectifying thermal images to obtain accurate temperature data associated with specific Earth positions and elevations. Additionally, it discusses the use of SODAR technology to validate temperature profiles and cold air pool depth by analyzing sound backscattering and its relationship to various atmospheric structure parameters.

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CHARACTERIZING COLD AIR POOL DYNAMICS USING THERMAL IMAGERY

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  1. BIOMICROMETEOROLOGY GROUP CHARACTERIZING COLD AIR POOL DYNAMICS USING THERMAL IMAGERY PRESENTED BY CHRIS JOHNSON

  2. Photo Credit: The University of Utah

  3. DESIGN OF EXPERIMENT SODAR

  4. THERMAL IMAGERY TO MAP COLD AIR POOL DYNAMICS Each pixel of temperature information will be associated with a position on the Earth and an elevation. But first the thermal imagery must be filtered, georeferenced, and orthorectified.

  5. GEOREFERENCING THERMAL IMAGERY Known Object and Location • Identify objects in the image • Obtain accurate locations • Use known objects as Ground Control Points Ground Control Point

  6. ORTHORECTIFICATION Data Gap

  7. VALIDATION – Temperature Profile • Basic Functions: • Emits a sound pulse • Measures properties of sound backscattered from turbulent fluctuations • Emitted pulse frequency • Backscattered sound frequency • Intensity of backscattered sound • Relationship to IR Measurements: • Atmospheric Structure Parameters • Refractive Index Structure Parameter(CN2) • Temperature Structure Parameter (CT2) • Intensity related to CN2 • CN2 related to CT2 • CT2 directly calculated from temperature gradient

  8. VALIDATION – Cold Air Pool Depth Assumption: The depth of the cold air pool is equal to the inversion height. Backscatter Intensity Potential Temperature ABL Conditions for Plot: Weak wind, surface radiatively cooling. Plot Credit: Beyrich, F., 1997. Mixing Height Estimation from SODAR Data. Atmospheric Environment 31, 3941-3953.

  9. DESIGN OF EXPERIMENT SODAR

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