Ocean color measurements onboard a jet ski: consistency for calval exercise of high-resolution satellite imagery?
2008
An original data set has been acquired on the 5 th of April 2008 during the international field experiment ECORS-Truc
Vert 2008 (SW France) in the nearshore zone over a complex bathymetry and in moderate turbid waters (SPM l10
mg/l). This data set synchronizes in-situ reflectance measurements onboard a jet-ski, bathymetric surveys and a
Formosat-2 high-resolution satellite acquisition.
The jet-ski provides an interesting mean to gather optical data in shallow waters and in environments hard to sample with
traditional coastal ships. An experimental device has been implemented on the jet-ski, equipped with two TRIOS
RAMSES sensors which measure simultaneous atmospheric downwelling irradiances E d and in-water upwelling
radiances Lu in the 350-950nm range. Water samples have also been collected at different stages of the jet-ski trajectory
(3-25m water depth) in order to assess the concentrations of the ocean constituents (SPM and Chl-a).
In the current study we present a methodology to validate FORMOSAT-2 high-resolution ocean color data using "jetski"
reflectance measurements, which first require a detailed analysis. The reflectance spectra measurements are shown
to be consistent: (i) they are typical of the presence of mineral particles with light absorption at short wavelengths; (ii)
their shape and magnitude depend on the depth and the water type (turbidity); (iii) some of them, especially in low
turbid waters, are similar to other reflectance spectra measured northward from a ship (Gironde mouth). Thus, the use of
"jet-ski" ocean color measurements appears to be adequate for remote sensing calval activities in shallow case-2 waters.
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