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Reference : UMR7093-EDOLEY-002
Workplace : VILLEFRANCHE SUR MER
Date of publication : Wednesday, November 21, 2018
Type of Contract : FTC Technical / Administrative
Contract Period : 12 months
Expected date of employment : 1 February 2019
Proportion of work : Full time
Remuneration : 29 to 37 keuros gross annual salary
Desired level of education : Higher than 5-year university degree
Experience required : Indifferent
A new kind of profiling float has been developed at the Laboratoire d'Océanographie de Villefranche (LOV) with the objective to provide a new autonomous platform for in situ radiometric measurements. The ProVal float is a unique Argo float dedicated to radiometric measurements for Ocean Color Cal/Val activities. It allows to retrieve 4 remote sensing reflectance (Rrs) spectra per radiometric profile from 2 sets of radiometers symmetrically mounted on 2 arms and from 2 phases of acquisition (profiling and buoy modes). Several floats have already been deployed in the Mediterranean Sea and Southern Ocean and acquired more than 600 profiles (ongoing).
The procedures to retrieve the most accurate Rrs spectrum representative of each profile, as well as other ocean color products (e.g., diffuse attenuation coefficients), have to be developed for this new platform along with dedicated Quality Control protocols. Estimation of uncertainties as well as match-up analyses of Ocean Color satellite data will also be conducted with the ultimate goal to establish the potential role of such platform for the calibration and validation of ocean color sensors and produce an “operational method” to provide data in near real time to space agencies.
Set up of a processing protocol of the ProVal data, including:
- correction for self-shading and relative drift
- creation of automated QC flags
Analysis of uncertainties, including: theoretical (simulation) analysis of external factors (clouds, …) impact on uncertainties
Publication of methods and results
Distribution of the Data (database: ODATIS)
Participation to logistical aspects of float deployments/recovery
PhD (or engineering school) in Computational science, earth-science, radiative transfer or oceanography.
Knowledge in ocean-optics and data processing of in situ radiometric data is strongly encouraged as well as experience with the HydroLight radiative transfer model.
Very good capabilities of programming. Knowledge of the R programming software appreciated.
Scientific English (level B2)
A 1-year position, funded by the CNES (French space agency), will be open at the Laboratoire d'Océanographie de Villefranche (LOV, FRANCE) to work on the data processing and Quality Control (QC) of the ProVal data set. The successful candidate will benefit from the dynamic environment of the OMTAB team at LOV which has a long history of high quality research in each of the topics related to this project: marine optics, in situ radiometric measurements and vicarious calibration (BOUSSOLE project: www.obs-vlfr.fr/Boussole/) and BGC-Argo floats (www.biogeochemical-argo.org). Our team is composed of 7 researchers, 6 engineers, 3 post-doctoral fellows and 4 PhD students. The person recruited will be under the responsibility of Edouard Leymarie in charge of the ProVal project. He/She will work closely with Vincenzo VELLUCCI in charge of the BOUSSOLE project. International collaborations will also be possible (M. Lewis, Dalhousie University, Halifax and E. Boss, University of Maine, USA).
Constraints and risks
Possibility of working at sea on day trips.
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