56 research outputs found
Météo-France/E-SURFMAR HRSST (re)calibration
No full textThis presentation was given at the Scientific and technical workshop on traceability of drifter SST measurements in La Jolla, CA. It revisits the data collected by HRSST drifting buoys, comparing the data to ERA-Interim, and shows results of a calibration control of three HRSST probes recovered after nearly 2 years of operation at sea
Développement et essais d'un salinomètre optique
No full textInternational audienceSalinity is the essential parameter for ocean dynamics studies. Its definition and using in the equations used to calculate the thermodynamic properties of seawater, have been revised in 2010, opening the possibility of new sensors developments. In this context, NOSS (NKE Optical Salinity Sensor) has emerged as one of the first underwater instrument for in situ refractive index measurement in the past years open up the scope of possibilities to access to density parameter. This achievement is the fruit of the cooperation between several institutions and the fruit of several years of developments and trials. NOSS sensor has been designed to be deployed in coastal environment and open-ocean waters up to 2000 m, especially on profiling floats of the Argo network.</p
Transmission of Botrytis cinerea to grapes by grape berry moth larvae
No full textInternational audienc
Role des larves de Lobesia botrana dans la dissemination de la pourriture grise de la vigne
No full textNational audienc
Mise en evidence de la vection des spores de Botrytis cinerea par les larves de Lobesia botrana
No full textInternational audienc
Velocity Calibration of Doppler Current Profiler Transducers
No full textDoppler current profilers are used in oceanography to measure oceanic circulation but also in hydrology to calculate the flow of rivers. They allow the retrieval of water mass profiles in terms of velocity and direction. Direction is obtained via an electronic compass and tilt sensors, while velocity is obtained by measuring Doppler pulse shifts back-scattered by particles located in water cells allocated along the instrument’s measurement range. Current meters are usually tested in towing basins or hydrodynamic channels, but these facilities present limits in terms of the measurement range, particles concentration and time costs. This paper presents a novel method developed to test the trueness of these velocity measurements in the laboratory, along with the uncertainty of this test and the results obtained with current meters and stand-alone profilers. The method is based on the measurement of the frequency of pulses emitted by each transducer of the instrument independently, and on the simulation of received echoes by a variable frequency sinusoidal signal
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