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Purposes of USDA UVB Monitoring and Research Program

Detecting Smoke from Forest Fires Using USDA Shadow-band Radiometers James Slusser USDA UV-B Monitoring and Research Program Natural Resource Ecology Laboratory Colorado State University. Purposes of USDA UVB Monitoring and Research Program.

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Purposes of USDA UVB Monitoring and Research Program

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  1. Detecting Smoke from Forest Fires Using USDA Shadow-band RadiometersJames SlusserUSDA UV-B Monitoring and Research ProgramNatural Resource Ecology LaboratoryColorado State University

  2. Purposes of USDA UVB Monitoring and Research Program • Furnishes basic information necessary to support research on potential damaging effects of UVB on agriculture, forests, and livestock • Provides UV climatology data to agricultural and scientific researchers • Supplies ground truth for satellite retrievals and model development • Establishes long-term record of UVB to assess trends

  3. Quebec Fires, 7 July 2002

  4. SeaWIFS image 7 July 2002 showing USDA sites

  5. Three measures of aerosol and smoke loading are: Aerosol optical depth (AOD) quantifies the attenuation of the direct Solar beam. The AOD is proportional to total column loading of particles of the same size. Angstrom exponent gives the wavelength dependence of the AOD. Large particles (such as cloud drops or ice crystals) are spectrally neutral (alpha close to 0). The very smallest particles , molecules, have an inverse (wavelength) to the fourth dependence (alpha equal to 4). Most aerosols have alpha between 1 and 3. Single scattering albedo is the ratio of scattering to scattering plus absorption. For non absorbing particles it equals 1.0.

  6. Effects of thick urban haze on irradiances Model no aerosols Beltsville, MD July 17, 1999

  7. Non-absorbing aerosols

  8. TOMS Aerosol Index for May 15, 1998

  9. Effects of thick smoke on 368 nm UV irradiances Baton Rouge, LA May 15, 1998

  10. Absorbing aerosols

  11. Direct Diffuse Total Direct to diffuse ratio

  12. Begin Beltsville Slides

  13. Beltsville, MD

  14. Begin New York Slides

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