engleski

Contrasting global and local satellite-derived SST estimates in a marginal sea

Global SST estimates commonly exhibit near-zero bias almost independently of the sensor used. Going down to regional scale can notably increase it, suggesting spatial dependencies in retrieval accuracies. To assess the performance of IR radiometers in the Adriatic Sea a validation exercise with extensive set of drifter-derived SST was performed for the year 2003, whereas platform-measured SST was used for the year 2004. Validation results for the SST derived from locally-received NOAA 16 and 17 HRPT telemetry have been also compared to Level2 MODIS Aqua and Terra as well as Pathfinder v5 SST products. Night time results have consistently shown small standard deviation of 0.3°C and rather large negative bias around 0.3°C when the short IR channels are used in deriving the SST. Day time results exhibit high seasonality with the positive overall bias of order 0.4°C and standard deviation of 0.6°C. Lacking comparable in situ data for the following years, we selected the GHRSST-PP AATSR-derived L2P SST as a surrogate reference. Influence of the atmospheric and diurnal warming effects has been scrutinized in explaining the observed co-variability and discrepancies.

SST; AVHRR; MODIS; AATSR; Pathfinder; Adriatic Sea

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