Details for Combined analysis of LOGMEC16 oceanographic glider and satellite data and their correlation

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Name:Combined analysis of LOGMEC16 oceanographic glider and satellite data and their correlation
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Combined analysis of LOGMEC16 oceanographic glider and satellite data and their correlations. Borrione, Ines; Oddo, Paolo; Russo, Aniello; Coelho, Emanuel. CMRE-MR-2017-003. April 2017.

During the LOGMEC16 (Long-Term Glider Mission for Environmental Characterisation) sea trial carried out in the eastern Ligurian Sea (North-western Mediterranean Sea), two oceanographic gliders rated to a maximum depth of 1000m were operating continuously from 3 May to 27 June 2016. When possible, glider tracks were synchronised with the footprints of contemporaneous altimeters (i.e., Jason 2, SARAL/AltiKa and CryoSat-2). Temperature and salinity measured by the gliders that were co-localised with the altimeter passages, were used to calculate along-track dynamic heights. The latter were then compared with the near-real time absolute sea level CMEMS-TAPAS (Copernicus Marine Environment Monitoring Service - Tailored Altimetry Products for Assimilation Systems) product. Where available, the CMEMS near-real time 1 km resolution, Aqua-MODIS ocean colour data was also used as a tracer of the main oceanographic features of the region. Comparison between SLA derived from gliders and TAPAS along common transects, shows that patterns, variability, and scales in the filtered SLA are comparable to those obtained from glider measurements. Differences are mostly explained by the fact that gliders have sampled at different times the same structures, which were moving northwards at ~ 0.16 m s-1. Conversely, the unfiltered SLA shows a variability that is not fully captured by the in situ measurements. Both gliders and SLA provide evidence of mesoscale variability (i.e., meanders) likely due to the baroclinic instability of the Northern Current. The scales of these structures (i.e., amplitude of 39 km, and propagation speed of 0.16 m s-1) are in agreement with those previously described in literature, and are confirmed by the larger scale ocean colour measurements.

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Created On: 05/23/2017 12:38
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