Aerosol optical depth estimates based on nephelometer measurements at the SGP arm site
- NOAA Climate Monitoring and Diagnostics Laboratory, Boulder, CO (United States)
- Brookhaven National Laboratory, Upton, NY (United States); and others
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.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Oceanic and Atmospheric Administration, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 226419
- Report Number(s):
- BNL-62603; CONF-9603149-2; ON: DE96009696; TRN: 96:002815
- Resource Relation:
- Conference: 6. Atmospheric Radiation Measurement (ARM) science team meeting, San Antonio, TX (United States), 4-7 Mar 1996; Other Information: PBD: Mar 1996
- Country of Publication:
- United States
- Language:
- English
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