Publication Abstracts

Rossow et al. 1985

Rossow, W.B., F. Mosher, E. Kinsella, A. Arking, M. Desbois, E. Harrison, P. Minnis, E. Ruprecht, G. Seze, C. Simmer, and E. Smith, 1985: ISCCP cloud algorithm intercomparison. J. Clim. Appl. Meteorol., 24, 877-903, doi:10.1175/1520-0450(1985)024<0887:ICAI>2.0.CO;2.

The International Satellite Cloud Climatology Project (ISCCP) will provide a uniform global climatology of satellite-measured radiances and derive an experimental climatology of cloud radiative properties from these radiances. A pilot study to intercompare cloud analysis algorithms was initiated in 1981 to define a state-of-the-art algorithm for ISCCP. This study compared the results of applying six different algorithms to the same satellite radiance data. The results show that the performance of all current algorithms depends on how accurately the clear sky radiances are specified; much improvement in results is possible with better methods for obtaining the clear-sky radiances. A major difference between the algorithms is caused by their sensitivity to changes in the cloud size distribution and optical properties; all methods, which work well for some cloud types or climate regions, do poorly for other situations. Therefore, the ISCCP algorithm is composed of a series of steps, each of which is designed to detect some of the clouds present in the scene. This progressive analysis is used to retrieve an estimate of the clear sky radiances corresponding to each satellite image. Application of a bispectral threshold is then used as the last step to determine the cloud fraction. Clouds radiances are interpreted in terms of a simplified model of cloud radiative effects to provide some measure of cloud radiative properties. Application of this experimental algorithm to produce a cloud climatology and field observation programs to validate the results will stimulate further research on cloud analysis techniques as part of ISCCP.

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BibTeX Citation

  author={Rossow, W. B. and Mosher, F. and Kinsella, E. and Arking, A. and Desbois, M. and Harrison, E. and Minnis, P. and Ruprecht, E. and Seze, G. and Simmer, C. and Smith, E.},
  title={ISCCP cloud algorithm intercomparison},
  journal={Journal of Applied Meteorology and Climatology},

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RIS Citation

ID  - ro08300g
AU  - Rossow, W. B.
AU  - Mosher, F.
AU  - Kinsella, E.
AU  - Arking, A.
AU  - Desbois, M.
AU  - Harrison, E.
AU  - Minnis, P.
AU  - Ruprecht, E.
AU  - Seze, G.
AU  - Simmer, C.
AU  - Smith, E.
PY  - 1985
TI  - ISCCP cloud algorithm intercomparison
JA  - J. Clim. Appl. Meteorol.
JO  - Journal of Applied Meteorology and Climatology
VL  - 24
SP  - 877
EP  - 903
DO  - 10.1175/1520-0450(1985)024%3C0887%3AICAI%3E2.0.CO;2
ER  -

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