Publication Abstracts

Krotkov et al. 2002

Krotkov, N., J. Herman, P.K. Bhartia, C. Seftor, A. Arola, J. Kaurola, S. Kalliskota, P. Taalas, and I.V. Geogdzhayev, 2002: Version 2 total ozone mapping spectrometer ultraviolet algorithm: Problems and enhancements. Opt. Eng., 31, 3028-3039, doi:10.1117/1.1519541.

Satellite instruments provide global maps of surface UV irradiance by combining backscattered radiance measurements with radiative transfer models. The accuracy of the models is limited by uncertainties in input parameters representing the atmosphere and the Earth's surface. To reduce these uncertainties, we have made enhancements to the currently operational TOMS surface UV irradiance algorithm (Version 1) by including the effects of diurnal variations of cloudiness, an improved treatment of snow/ice, and a preliminary aerosol correction. We compare results of the version 1 TOMS UV algorithm and the proposed version. We evaluate different approaches for improved treatment for average cloud attenuation within a satellite pixel, with and without snow/ice on the ground. In addition to treating cloud transmission based only on the measurements at the local time of the TOMS observations, the results from other satellites and weather assimilation models can be used to estimate atmospheric UV irradiance transmission throughout the day. A new method is proposed to obtain a more realistic treatment of the effects from snow-covered terrain. The method is based on an empirical relation between UV reflectivity and measured snow depth. The new method reduces the bias between the TOMS UV estimations and ground-based UV measurements for snow periods. We also briefly discuss the complex problem of estimating surface UV radiation in presence of UV-absorbing aerosols. The improved (Version 2) algorithm can be applied to reprocess the existing TOMS UV irradiance and exposure estimates (since November 1978) and to future satellite sensors (e.g., GOME-2, OMI on EOS/Aura, and Triana/EPIC).

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BibTeX Citation

  author={Krotkov, N. and Herman, J. and Bhartia, P. K. and Seftor, C. and Arola, A. and Kaurola, J. and Kalliskota, S. and Taalas, P. and Geogdzhayev, I. V.},
  title={Version 2 total ozone mapping spectrometer ultraviolet algorithm: Problems and enhancements},
  journal={Opt. Eng.},

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RIS Citation

ID  - kr01000b
AU  - Krotkov, N.
AU  - Herman, J.
AU  - Bhartia, P. K.
AU  - Seftor, C.
AU  - Arola, A.
AU  - Kaurola, J.
AU  - Kalliskota, S.
AU  - Taalas, P.
AU  - Geogdzhayev, I. V.
PY  - 2002
TI  - Version 2 total ozone mapping spectrometer ultraviolet algorithm: Problems and enhancements
JA  - Opt. Eng.
VL  - 31
SP  - 3028
EP  - 3039
DO  - 10.1117/1.1519541
ER  -

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