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Ocean Science An interactive open-access journal of the European Geosciences Union

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Ocean Sci., 13, 13-29, 2017
http://www.ocean-sci.net/13/13/2017/
doi:10.5194/os-13-13-2017
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
13 Jan 2017
Observability of fine-scale ocean dynamics in the northwestern Mediterranean Sea
Rosemary Morrow1, Alice Carret1, Florence Birol1, Fernando Nino1, Guillaume Valladeau2, Francois Boy3, Celine Bachelier4, and Bruno Zakardjian5,6 1LEGOS, IRD, CNRS, Université de Toulouse, Toulouse, 31400, France
2CLS Ramonville, St.-Agne, 31520, France
3CNES, Toulouse, 31400, France
4IRD, Brest, 29280, France
5Université de Toulon, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 83957 La Garde, France
6Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille, France
Abstract. Technological advances in the recent satellite altimeter missions of Jason-2, SARAL/AltiKa and CryoSat-2 have improved their signal-to-noise ratio, allowing us to observe finer-scale ocean processes with along-track data. Here, we analyse the noise levels and observable ocean scales in the northwestern Mediterranean Sea, using spectral analyses of along-track sea surface height from the three missions. Jason-2 has a higher mean noise level with strong seasonal variations, with higher noise in winter due to the rougher sea state. SARAL/AltiKa has the lowest noise, again with strong seasonal variations. CryoSat-2 is in synthetic aperture radar (SAR) mode in the Mediterranean Sea but with lower-resolution ocean corrections; its statistical noise level is moderate with little seasonal variation. These noise levels impact on the ocean scales we can observe. In winter, when the mixed layers are deepest and the submesoscale is energetic, all of the altimeter missions can observe wavelengths down to 40–50 km (individual feature diameters of 20–25 km). In summer when the submesoscales are weaker, SARAL can detect ocean scales down to 35 km wavelength, whereas the higher noise from Jason-2 and CryoSat-2 blocks the observation of scales less than 50–55 km wavelength.

This statistical analysis is completed by individual case studies, where filtered along-track altimeter data are compared with co-located glider and high-frequency (HF) radar data. The glider comparisons work well for larger ocean structures, but observations of the smaller, rapidly moving dynamics are difficult to co-locate in space and time (gliders cover 200 km in a few days, altimetry in 30 s). HF radar surface currents at Toulon measure the meandering Northern Current, and their good temporal sampling shows promising results in comparison to co-located SARAL altimetric currents. Techniques to separate the geostrophic component from the wind-driven ageostrophic flow need further development in this coastal band.


Citation: Morrow, R., Carret, A., Birol, F., Nino, F., Valladeau, G., Boy, F., Bachelier, C., and Zakardjian, B.: Observability of fine-scale ocean dynamics in the northwestern Mediterranean Sea, Ocean Sci., 13, 13-29, doi:10.5194/os-13-13-2017, 2017.
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Short summary
Spectral analyses of along-track altimetric data are used to estimate noise levels and observable ocean scales in the NW Mediterranean Sea. In winter, all altimetric missions can observe wavelengths down to 40–50 km (individual feature diameters of 20–25 km). In summer, SARAL can detect scales down to 35 km, whereas Jason-2 and CryoSat-2 with higher noise can only observe scales less than 50–55 km. Along-track altimeter data are also compared with collocated glider and coastal HF radar data.
Spectral analyses of along-track altimetric data are used to estimate noise levels and...
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