Aerosol optical depth estimates based on nephelometer measurements at the SGP arm site

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The scattering of shortwave radiation by anthropogenic aerosols during clear-sky conditions, termed direct aerosol forcing, has been estimated to be roughly 1 W/m{sup 2} on a global annual average and may be as high as 50 W/m{sup 2} locally and instantaneously new source regions. The extent of the direct aerosol forcing effect at a given time and place depends primarily in the aerosol optical depth, {tau}, as well as on other factors including the solar zenith angle, aerosol upscatter fraction, and the single scatter albedo (ratio of light scattering to total extinction). The aerosol optical depth at a given wavelength ... continued below

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8 p.

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Bergin, M. H.; Ogren, J. A. & Halthore, R. March 1996.

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The scattering of shortwave radiation by anthropogenic aerosols during clear-sky conditions, termed direct aerosol forcing, has been estimated to be roughly 1 W/m{sup 2} on a global annual average and may be as high as 50 W/m{sup 2} locally and instantaneously new source regions. The extent of the direct aerosol forcing effect at a given time and place depends primarily in the aerosol optical depth, {tau}, as well as on other factors including the solar zenith angle, aerosol upscatter fraction, and the single scatter albedo (ratio of light scattering to total extinction). The aerosol optical depth at a given wavelength ({tau}{sub {lambda}}) can be written as the integral with height to the top of the atmosphere (toa) of the aerosol extinction coefficient, b{sub ext,p}. Where b{sub ext,p} is the sum of the aerosol extinction (b{sub ap}) and scattering (b{sub sp}) coefficients. The objectives of this research are to use nephelometer measurements of the scattering coefficient to estimate the aerosol optical depth at a specific wavelength (530 nm), and to compare these results with optical depths measured by a Multi-Filter Rotating Shadowband Radiometer (MFRSR) and Cimel Sun Photometer. This comparison will used to determine if all of the key parameters related to aerosol optical depth are being measured at the SGP ARM site.

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8 p.

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OSTI as DE96009696

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  • 6. Atmospheric Radiation Measurement (ARM) science team meeting, San Antonio, TX (United States), 4-7 Mar 1996

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  • Other: DE96009696
  • Report No.: BNL--62603
  • Report No.: CONF-9603149--2
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 226419
  • Archival Resource Key: ark:/67531/metadc671169

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  • March 1996

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  • June 29, 2015, 9:42 p.m.

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  • Nov. 18, 2015, 12:02 p.m.

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Bergin, M. H.; Ogren, J. A. & Halthore, R. Aerosol optical depth estimates based on nephelometer measurements at the SGP arm site, article, March 1996; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc671169/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.