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17 December 1999 AVHRR-derived surface radiation budget in the Arctic Sea during the ARTIST experiment
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A new method to estimate radiation budgets at air-sea interface by means of AVHRR data has been developed and tested in the framework of the Arctic Radiation and Turbulence Interaction Study (ARTIST). Main goal of the ARTIST project is assess the effects of clouds and of Arctic Haze on the radiative fluxes at the surface and in the atmospheric column in the European Arctic. One month of Advanced Very High Resolution Radiometer (AVHRR) data relative to the period March - April 1998 has been processed and analyzed in order to evaluate short and long wave radiation budgets in the Arctic Sea during the experiment. Remote sensing data (NOAA 14 satellite) have been acquired at the Tromso station and then processed at the Istituto Fisica dell'Atmosfera (IFA) to produce maps of surface albedo and brightness temperature of the experiment's zone. These maps were used to develop a new cloud detection algorithm for the region. Image pixels then have been classified as ice, clouds or water. The method was applied to 151 available AVHRR scenes. The pixels classification performance was verified against the analysis of an expert in satellite image. The cloud classification results to be quite accurate. In fact 99 images are classified as 'very good' by the expert and 37 images the accuracy is a little lower. The radiation budgets are then estimated using several available empirical formulae for clear sky and overcast conditions. The results were compared with in situ measurements made during the ARTIST experiment in order to define the best parameterization of the fluxes. The best estimates of shortwave incoming radiation results from the Bennet (1982) formula for clear sky condition with the Laevastu (1960) correction for overcast condition. The more accurate estimate of incoming long wave radiation in clear sky has been obtained using the Swinbank (1963) parameterization. Finally, averaged map of total radiation budget are calculated for the time period of the ARTIST experiment in the Arctic region.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christina Ananasso, Fabrizio D'Ortenzio, Rosalia Santoleri, and Salvatore Marullo "AVHRR-derived surface radiation budget in the Arctic Sea during the ARTIST experiment", Proc. SPIE 3868, Remote Sensing for Earth Science, Ocean, and Sea Ice Applications, (17 December 1999);

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