Francois Mercier

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Francois MERCIER

PhD student at LATMOS
Laboratoire Atmosphères, Milieux, Observations Spatiales
Research team SPACE
Statistiques, Processus, Aérosols, Cycle de l'Eau


 

 



Adress :
LATMOS / OVSQ
Office 1145
11 boulevard d'Alembert
78280 Guyancourt, FRANCE

Email : francois.mercier@latmos.ipsl.fr

Phone : +33 (0)1 80 28 52 17

Research activities

  • I am a PhD student at LATMOS since October 2013, under the supervision of Drs. Laurent Barthès, Aymeric Chazottes and Cécile Mallet. I study the vertical variability of the rain drop size distribution (DSD) from radar and in-situ observations. Specifically, I develop a 4D-VAR data assimilation algorithm. Its goal is to retrieve the DSD and wind field by coupling a numerical propagation model with observations of different natures (Doppler radar spectra and ground disdrometer measurements). The propagation model is able to take into account different physical phenomena occurring during the rain drops fall (gravity, wind, evaporation, collisions between drops). The aims of the work are to merge and make comparable very different observations and to study the relative importance of the phenomena impacting the DSD and their parameterization in the models. .

  • I have also previously worked at LATMOS on another data assimilation algorithm. Its aim was to retrieve rainfall maps at small scale (0.5*0.5km² / 1 minute) from measurements of rain attenuation over broadcast TV satellite links in the Ku-band.

  • Publications

  • Mercier F., Chazottes A., Barthès L., Mallet C. (2015) : 4-D-VAR assimilation of disdrometer data and radar spectral reflectivities for rain drop size distribution and vertical wind retrievals, Atmospheric Measurement Techniques, European Geosciences Union, 2015, (in press). [discussion paper]

  • Mercier F., Barthès L., Mallet C. (2015) : Estimation of fine-scale rainfall fields using broadcast TV-SAT links and 4D-VAR assimilation method, Journal of Atmospheric and Oceanic Technology, American Meteorological Society, 2015, 32(10), pp.1709-1728. [HAL] [AMS]

  • Brown J. M., Amoudry L. O., Mercier F., Souza, A. J. (2013) : Intercomparison of the Charnock and COARE bulk wind stress formulations for coastal ocean modelling Ocean Science, 2013, 9(4), pp.721-729. [Ocean Science]

  • Communications

  • Akrour N., Mercier F., Mallet C., Barthès L. : Rainfall at Urban Hydrological Scales : Opportunist use of TV-SAT Receivers Network. Raingain Conference "Researchers & Water Managers Preparating Cities for a Changing Climate" in the Framework of the COP21 Preparation, June 2015, Marne-La-Vallée, France. [poster]

  • Mercier F., Barthès L., Chazottes A., Mallet C. : 4D-VAR assimilation of radar and in-situ data for studying parameterization and dynamics of the raindrop size distribution. EGU general assembly, April 2015, Vienna, Austria. [poster]

  • Mercier F., Barthès L., Mallet C. : Rainfall fields estimation by data fusion of microwave links and rain gauges based on a variationnal 4D-VAR assimilation technic. 7th HyMeX Workshop, Oct 2013, Cassis, France. [poster]

  • Mercier F., Barthès L., Mallet C. : Rainfall fields estimation by data fusion based on a variational 4D-VAR assimilation technic of rain gauges and microwave links. 1st Megha Tropiques Ground Validation Workshop on Rainfall Products Validation and Hydrological Applications in the Tropics, Sep 2013, Toulouse, France. [abstract]

    Curriculum

  • 2013 - 2016 : PhD student at LATMOS / Université de Versailles St-Quentin-en-Yvelines, Guyancourt, France.
      06-07/2015 : visiting Dr. Alain Protat at Bureau of Meteorology, Melbourne, Australia.

  • 2009 - 2013 : Student at Ecole Centrale de Lyon, specializing in applied mathematics, Lyon, France.
    • 04/2013 - 09/2013 : 6-months internship at LATMOS, Guyancourt, France, under the supervision of Drs. Laurent Barthès and Cécile Mallet.
      Estimation of finescale rainfall fields using broadcast TV satellite links and a 4D-VAR data assimilation method
    • 03/2012 - 08/2012 : 6-months internship at National Oceanography Centre, Liverpool, UK, under the supervision of Drs. Laurent Amoudry, Jenny Brown and Alex Souza.
      Development of numerical predictions in Liverpool Bay : Impact of river inputs and boundary and initial conditions on hydrodynamic predictions Modelling sediment transport and morphological evolution

  • 2007-2009 : Student in math preparatory classes (MPSI-MP*), lycée Blaise Pascal, Clermont-Ferrand.