Surface Insolation from AVHRR Data by Means of a Three-Dimensional Histogram Separation

Details Surface Insolation from AVHRR Data by Means of a Three-Dimensional Histogram Separation Surface Insolation from AVHRR Data by Means of a Three-Dimensional Histogram Separation

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..24..963k&link_type=abstract

Advances in Space Research, Volume 24, Issue 7, p. 963-966.

Computer Science

Scientific paper

An analysis has been carried out to investigate the possibilities of the retrieval of surface insolation in the Baltic Sea region from satellite data. For this purpose, radiation measurements in three channels of AVHRR (CH1, CH2 and CH4) during eight overpasses of NOAA-11 have been used. The method is based on the idea that the outgoing radiation contains sufficient information on the cloud cover. Three-dimensional radiation histograms over target areas of approximately 200×200 km2 were approached by means of mixtures of Gaussian components that can be ascribed to different cloud layers or surface areas. Use of the ratio of CH2CH1 radiances as the third variable permits to separate clear and cloudy components better. Therefore, an advanced threshold scheme can be built in comparison with a two-dimensional case that uses only CH1 and CH4 data and needs additional information on the temperature profiles. The method enables one to derive surface insolation over large areas. To get better results, ground-based measurements in sparse actinometric stations could be used to tune the retrieval

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