A New Instrument for Measurement of the Solar Aureole Radiance Distribution from Unstable Platforms

Joseph M. Ritter Physics Department, University of Miami, Coral Gables, Florida

Search for other papers by Joseph M. Ritter in
Current site
Google Scholar
PubMed
Close
and
Kenneth J. Voss Physics Department, University of Miami, Coral Gables, Florida

Search for other papers by Kenneth J. Voss in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

A novel imaging solar aureole radiometer, which can obtain absolute radiometric measurements of the solar aureole when operated on an unstable platform, is described. A CCD array is used to image the aureole, while a neutral density occulter on a long pole blocks the direct solar radiation. This ensures accurate direction registration as the sun appears in acquired images, and the total circumsolar region is measured simultaneously. The imaging nature of this instrument along with a special triggering device permit acquisition of the circumsolar sky radiance within 7.5° of the center of the solar disk, and within 1° of the edge of the solar disk. This innovation makes possible, for the first time, reliable and accurate radiometric measurements of the solar aureole from unstable mobile platforms such as ships. This allows determination of the small angle atmospheric light scattering. The instrument has been used in field studies of atmospheric aerosols and will be used in satellite validation and calibration campaigns.

* Current affiliation: Space Optics Manufacturing Technology Center, Advanced Optical Systems Development, NASA MSFC, Huntsville, Alabama.

Corresponding author address: Space Optics Manufacturing Technology Center, Advanced Optical Systems Development SD 71, NASA MSFC, Huntsville, Alabama 35812.

Email: Joe.Ritter@msfc.NASA.gov

Abstract

A novel imaging solar aureole radiometer, which can obtain absolute radiometric measurements of the solar aureole when operated on an unstable platform, is described. A CCD array is used to image the aureole, while a neutral density occulter on a long pole blocks the direct solar radiation. This ensures accurate direction registration as the sun appears in acquired images, and the total circumsolar region is measured simultaneously. The imaging nature of this instrument along with a special triggering device permit acquisition of the circumsolar sky radiance within 7.5° of the center of the solar disk, and within 1° of the edge of the solar disk. This innovation makes possible, for the first time, reliable and accurate radiometric measurements of the solar aureole from unstable mobile platforms such as ships. This allows determination of the small angle atmospheric light scattering. The instrument has been used in field studies of atmospheric aerosols and will be used in satellite validation and calibration campaigns.

* Current affiliation: Space Optics Manufacturing Technology Center, Advanced Optical Systems Development, NASA MSFC, Huntsville, Alabama.

Corresponding author address: Space Optics Manufacturing Technology Center, Advanced Optical Systems Development SD 71, NASA MSFC, Huntsville, Alabama 35812.

Email: Joe.Ritter@msfc.NASA.gov

Save
  • Charlson, R. J., S. E. Schwartz, J. M. Hales, R. D. Cess, J. A. Coakley Jr., J. E. Hansen, and D. J. Hofmann, 1992: Climate forcing by anthropogenic aerosols. Science,255, 423–430.

    • Crossref
    • Export Citation
  • Clark, D. K., H. R. Gordon, K. J. Voss, Y. Ge, W. Broenkow, and C. Trees, 1997: Validation of atmospheric correction over the oceans. J. Geophys. Res.,102, 17 209–17 217.

    • Crossref
    • Export Citation
  • Gordon, H. R., 1997: Atmospheric correction of ocean color imagery in the Earth Observing System era. J. Geophys. Res.,102, 17 081–17 106.

    • Crossref
    • Export Citation
  • Holben, B., A. Setzer, T. F. Eck, A. Pereira, and I. Slutsker, 1996: Effect of dry-season biomass burning on Amazon Basin aerosol concentrations and optical properties. J. Geophys. Res.,101, 1992–1994.

    • Crossref
    • Export Citation
  • Houghton, J. T., L. G. Meira Filho, B. A. Callendar, N. Harris, A. Kattenberg, and K. Maskell, Eds., 1996: Climate Change 1995: The Science of Climate Change. Cambridge University Press, 572 pp.

  • McGuckin, B. T., D. A. Haner, and R. T. Menzies, 1997: Multiangle imaging spectroradiometer: Optical characterization of the calibration panels. Appl. Opt.,36, 7016–7022.

    • Crossref
    • Export Citation
  • Moore, K. D., K. J. Voss, and H. R. Gordon, 1998: Spectral reflectance of whitecaps: Instrumentation, calibration, and performance in coastal waters. J. Atmos. Oceanic Technol.,15, 496–509.

    • Crossref
    • Export Citation
  • Nakajima, T., M. Tanaka, and T. Yamauchi, 1983: Retrieval of the optical properties of aerosols from aureole and extinction data. Appl. Opt.,22, 2951–2959.

    • Crossref
    • Export Citation
  • ——, G. Tonna, R. Rao, P. Boi, Y. J. Kaufman, and B. Holben, 1996: Use of sky brightness measurements from ground for remote sensing of particulate polydispersions. Appl. Opt.,35, 2672–2686.

    • Crossref
    • Export Citation
  • Ritter, J. M., 1998: Remote measurement of aerosol scattering properties and the development of a novel imaging solar aureole radiometer. Ph.D. thesis, University of Miami.

  • ——, K. J. Voss, and H. R. Gordon, 1997a: A new instrument for shipborne radiometric measurements of the solar aureole. 1997 Spring Meeting, Baltimore, MD, Amer. Geophys. Union, Mineralogical Society of America, and Geochemical Society.

  • ——, ——, ——, D. Clark, and L. Koval, 1997b: Solar aureole measurements of volcanic aerosol in the Kilauea plume. 1997 Fall Meeting, San Francisco, CA, Amer. Geophys. Union.

  • Twomey, S., 1977: The influence of pollution on the shortwave albedo of clouds. J. Atmos. Sci.,34, 1149–1152.

    • Crossref
    • Export Citation
  • Wang, M., and H. R. Gordon, 1993: Retrieval of the columnar aerosol phase function and single-scattering albedo from sky radiance over the ocean: Simulations. Appl. Opt.,32, 4598–4609.

    • Crossref
    • Export Citation
  • Zibordi, G., and K. J. Voss, 1989: Geometric and spectral distribution of sky radiance: Comparison between simulations and field measurements. Remote Sens. Environ.,27, 343–358.

    • Crossref
    • Export Citation
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 328 84 3
PDF Downloads 135 39 6