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Abstract :
[en] A comparison between satellite and in situ sea surface temperature (SST) data in
the Western Mediterranean Sea in 1999 is shown. The aim of this study is to better understand
the differences between these two data sets, in order to compute merged maps of
SST using satellite and in situ data. When merging temperature from different platforms,
it is crucial to take the expected RMS error of the observations into account and to correct
for possible biases. Different in situ data sensors and platforms (CTD, XBT, drifter, etc)
are available for the comparison, each with specificities in the nature of the measurement
(accuracy and precision of the measures), and with different spatial and temporal distributions.
A comparison with satellite data needs to take these factors into account. Statistics
about the differences due to the hour of the day, the month of the year, the type of sensor/
platform used and the spatial distribution is therefore realised through a combination
of error measures, diagrams and statistical hypothesis testing. The data used are Advanced
Very High Resolution Radiometer (AVHRR) SST day-time and night-time satellite data,
and in situ temperature data from various databases (World Ocean Database’05, Coriolis,
Medar/Medatlas and ICES).