Brest, 29th November 2012
Deep Arvor prototype is a technical challenge
In order to allow the Deep Arvor to measure deeper and to resist increasing pressure of 360 bars (pressure of 360kg/cm²), major improvements have been made on the float: salinity and temperature sensors, hydraulic engine, satellite, antenna, energy, etc.
The main innovation is the use of a light composite tube easy to manufacture. The float weight is 20-26 kg only and the measurement depth has been increased of 70% (from 2,000 to 3,500 meters).
Deep Arvor includes new features such as remote control, high resolution (sampling profile every meter). In addition to salinity and temperature, it is able to perform measurements of oxygen.
Deep Arvor should perform 150 cycles generating 150 profiles salinity, temperature and oxygen in a four year life time. Ifremer will transfer the Deep Arvor technology to its industrial partner NKE, who will manufacture and test two prototypes in 2013. A series of 24 deep floats will be tested by Ifremer in the North Atlantic Ocean in 2014.
NAOS strengthens Argo
The first objective of NAOS is to consolidate the French and European contribution to the Argo global observation system by deploying 10 to 15 additional floats each year from 2012 to 2019. Technological developments will be implemented to improve the reliability, lifetime, data transmission, energy efficiency and cost effectiveness and to expand on the operational capacity of the floats. They will be able to take deeper measurements and operate under ice in polar waters. Equipped with different sensors, they will perform more observations (dissolved oxygen, chlorophyll, nitrate).
NAOS benefits from a state aid from the French programme « Investissements d'Avenir » operated by the National Research Agency (ANR-10-EQPX-40).
Argo revolutionizes ocean research
Argo data, which are automatically transmitted by satellite to the Coriolis database available on the Internet, are effectively complementing satellite data to observe, understand, and, eventually, forecast the role of the ocean on the earth climate. They have already contributed to great improvements in the estimation of heat stored in the oceans. Argo data have been used to better understand mean sea level rise and to analyse large scale ocean circulation variations and deep convection areas. More than 200 scientific papers related to Argo data are published every year. This demonstrates the outstanding contribution of these new observations for ocean and climate research.
Key dates :
End of 1999 : First deployments of Argo floats.
November 2007 : The objective of 3000 deployed floats is reached. Since then, the number of operational floats has never been under 3000. They provide every year 100 000 temperature and salinity profiles.
January 2011 : NAOS successfully passed the first round of calls for proposals under the "Equipment of Excellence" (EQUIPEX) funding scheme.
June 2011 : EQUIPEX-NAOS project kick off.
June 2012 : First annual meeting of NAOS project in Brest.
Summer 2012 : Deep-Arvor, new generation float prototype, successfully tested.
December 2019 : End of NAOS project
"Les Nouvelles de l'Ifremer" n°133 - July 2012 (in French) : http://wwz.ifremer.fr/institut/Les-ressources-documentaires/Medias/Les-Nouvelles-de-l-Ifremer
(1) Marine oceanographic and hydrographic services - www.shom.fr
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