nke instrumentation

nke instrumentation launched two new products the DEEP ARVOR and the NOSS.

The DEEP ARVOR provides salinity, temperature and pressure profiles up to 4000 meters depth, using proven ARGO sensors. Data are transmitted by IRIDIUM satellite system and the float is GPS positioned. With self-ballast and light design, DEEP ARVOR allows easy deployment, without ballasting set up. ISA algorithm (Ice sensing algorithm) with untransmitted profiles storage and delayed transmission capability will be implemented in 2016. The Deep Arvor is able to make 150 “CTD” cycles at 4000 meters depth.

Design has been performed by Ifremer with well qualified Arvor subassemblies and new hull technologies. nke instrumentation achieves the industrial, production and commercialization.

By mid-January 2016, nke Instrumentation will have delivered 22 DEEP ARVOR, 12 of which were deployed, and six of them were still in action. At the beginning of this year, nke instrumentation recorded a total of 550 successful cycles.

NOSS profiling floats: In recent years, the Thermodynamic Equations of Seawater have been redefined and it has introduced the concept of absolute salinity in the calculation of seawater density. In contrast to practical salinity (depending on conductivity), absolute salinity is expressed in SI units and it includes the influence of the small spatial variations of seawater composition in the global ocean. The traceability of its measurement to the SI has become crucial.

An in situ salinity-density sensor (called NOSS) has been designed and manufactured by nke Instrumentation. This sensor based on refractive index measurement of the seawater has been characterized and qualified in relevant environment. Laboratory performances are compliant with the target in terms of measurements uncertainties. Since then, two Argo profiling floats were equipped with NOSS sensors, in addition to the usual temperature, pressure and conductivity sensors fitting out these floats.

They were deployed in the northwestern Mediterranean during spring 2015 in order to complete the evaluation of the NOSS sensor in real conditions. Time series of temperature, conductivity, pressure and refractive index were recorded, and absolute salinity and in situ density were calculated, at a high vertical resolution of about 2 m in the 0 - 2000 m layer. These data were analysed to characterize the mixed layer depth and evaluate the potential anomalies of composition in the area. www.nke.fr


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