engleski

INTER-SENSOR AND MULTI-ALGORITHM COMPARISON OF THE ADRIATIC SATELLITE-DERIVED SST

In this study, focused on the Adriatic Sea and the year 2006, the SST derived from the AVHRR sensor on NOAA 17 and MODIS sensor on Terra is compared with the reference SST data derived from AATSR sensor on the ENVISAT platform. Four AVHRR coefficient sets for NLSST split algorithm during daytime and MCSST triple during nighttime were used in the comparison: NOAA/NESDIS global, Adriatic drifter-derived, Adriatic ERA40-derived, and Adriatic AATSR-regressed. The AVHRR HRPT data stream has been received locally and processed to L2, whereas the MODIS and AATSR data were retrieved as L2 products from the GSFC OBPG and GHRSST-PP/Medspiration respectively. Comparison shows that the overall biases are in the range between -0.3°C and +0.3°C depending on the sensor and algorithm used. AVHRR daytime standard deviations are between 0.6°C and 0.7°C and nighttime standard deviations are below 0.4°C for all set of coefficients. MODIS standard deviations are the lowest for both day (0.44°C) and night (0.23°C). Additional AVHRR daytime filtering, based on the coincident MODIS data, reduces the standard deviation to 0.35°C. Compared to AVHRR global daytime NLSST split algorithm, local (drifter-derived) NLSST split coefficients did not show higher water-vapor dependence with increasing temperature.

SST; AVHRR; MODIS; AATSR; Adriatic Sea; algorithms

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