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Job Offer - Lidar

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Development of a new standardized and fully automated algorithm for lidar characterization of PBL vertical structure at ICOS-atmospheric stations. Introduction This job is proposed by the Department of Physical Sciences (DSM) of the Atomic Energy and Alternative Energies Commission (CEA) in Saclay (near Paris), in close collaboration with the Laboratory of Dynamic Meteorology (LMD) of Ecole Polytechnique. Within CEA/DSM, LSCE (Laboratory of Climate Sciences and the Environment), laboratory CEA/CNRS/UVSQ, is a European leader in atmospheric measurements of greenhouse gas and modeling of biogeochemical cycles and climate. It employs nearly 300 scientists and associated personnel. Background ICOS (Integrated Carbon Observation System) is a new European research infrastructure that aims to better understand and quantify the budget of greenhouse gas emissions by performing long-term observations. The Atmosphere Thematic Center (ATC) of ICOS, operated by LSCE is responsible for the processing and distribution of atmospheric measurements. Atmospheric Boundary Layer Height (BLH) is the first-order control on the relationship between trace gas fluxes at the surface and the resulting change in atmospheric tracer mixing ratio. A correct representation of BLH in a tracer transport model is of key importance for interpreting mixing ratio measurements from atmospheric stations. Therefore mixing height observations, retrieved from lidar backscatter profiles, have been made a core parameter of ICOS stations, and will be processed at ATC. Within the framework of the European project ICOS – INWIRE , we will develop a new automatic retrieval of atmospheric boundary layer height by lidar measurement that is machine-independent. Mission Within the RAMCES team at LSCE and in collaboration with the SIRTA LMD, the candidate in collaboration with a SIRTA engineer, will develop algorithms dedicated to the retrieval of boundary layer height from lidar measurements, will conduct research and tests to validate the system for estimating the height of the boundary layer, and will take care of the management and maintenance of the lidar instruments from ICOS. Main activities Signal processing and algorithm. The candidate will use a recently developed algorithm at LMD for restitution of atmospheric boundary layer height from backscatter lidar data coupled with ground turbulent flow algorithm to test and adapt to several families of instruments, at several sites, and assess their performance. The next step is to adapt the scripts to manage the flow of data in the database of the ICOS ATC. Site maintenance of lidar measurements from the ICOS France network. The ICOS network has three lidar deployed or soon to be deployed on the network. The candidate will ensure the proper functioning of equipment and reliability of the automatic transfer of data from the stations to the data center ICOS ATC, for their integration into the database and their automatic processing. Compétences requises : Engineering/master degree or PhD in atmospheric science, instrumentation, measurement physics, or related subject Knowledge of lidar measurement techniques Strong skills in scientific Computing interpreted language: Matlab / Python / R or other. Work environment: Linux/Windows. Good writting skills and good level of English (written and oral) Rémunération : Salary following CEA salary grid and graduation level Contact : Jérôme Tarniewicz - LSCE/IPSL – CEA Orme des Merisiers - Bât.703P, pce.14 point e 129, F- 91191 Gif -sur- Yvette Cedex , France Martial Haeffelin - IPSL / Laboratory of Dynamic Meteorology - Ecole Polytechnique - LMD / IPSL - Ecole Polytechnique - 91128 Palaiseau Cedex , France
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