Dr. Thomas Fauchez

Dr. Thomas Fauchez

  • RESEARCH SCIENTIST
  • 301.614.6230
  • NASA/GSFC
  • Mail Code: 699
  • Greenbelt , MD 20771
  • Employer: UNIVERSITIES SPACE RESEARCH ASSOCIATION
  • Brief Bio

    Thomas Fauchez is a space research scientist employed by GESTAR/USRA at NASA GSFC in the Planetary Environments Laboratory. His research interest involve the modeling of exoplanetary atmospheres and particularly the impact of cloud coverage in simulated transmission spectra that can be observed by the future JWST NASA mission.

    Before his space research scientist position, Thomas Fauchez was a NASA Postdoctoral Program (NPP) fellow at NASA GSFC, in the Climate and Radiation laboratory under the supervision of Steven Platnick. He worked on cirrus cloud heterogeneity impacts for MODIS cloud property retrievals, in the visible and thermal infrared.

    He received his PhD in atmospheric physics at Lille University in the Laboratoire d'Optique Atmospherique (LOA) under the supervision of Pr. Philippe Dubuisson, Dr Celine Cornet and Dr Frederic Szczap (LaMP). He studied cirrus cloud heterogeneities and their impacts on the thermal infrared radiative transfer and cloud property retrievals.

    Thomas Fauchez also received a master's degree in space sciences, speciality astrophysics. His master's thesis involved the study of massive star binary systems with colliding winds in the X-rays using XMM Newton data with the GAPHE group at Liege University, Belgium.
     

    Research Interests

    Rocky exoplanet characterization

    Dr. Fauchez research interests are focused on rocky exoplanet characterization. He runs 3D GCMs (ROCKE3D, LMDG, CAM) and 1D GCM (ATMOS) to predict possible atmospheric states and habitability of rocky exoplanets. One of his favorite systems is TRAPPIST-1. He is using his background in cloud modeling to assess how clouds and hazes may be obstacles to atmospheric characterization. Clouds and hazes may inded block partially or totally the light passing through a planetary atmosphere during a transit.

    Dr. Fauchez is also interested in the possibilities that offers spectropolarimetry to characterize exoplanets and has worked on the O2 detection in Earth like exoplanets as a function of the cloud coverage and surface properties.



     

    3D cloud modelling and radiative transfer

    Dr. Fauchez is very interested in cloud modelling, as well as on the radiative transfer in various domains.
    Since 2010 he has been working on 3D cloud modelling, particularly on cirrus clouds. He has developed, along with one of his  supervisor, Frederic Szczap (LaMP laboratory), a cloud generator named 3DCLOUD. This model is designed to generate cloud fields that share some statistical properties observed in real clouds such as the inhomogeneity parameter ρ (standard deviation normalized by the mean of the studied quantity), the Fourier spectral slope β close to -5/3 between the smallest scale of the simulation to the outer Lout (where the spectrum becomes flat).

    He has also developed with his second PhD advisor (Celine Cornet, LOA), a 3D Monte-Carlo radiative transfer model (3DMCPOL) to simulate radiative quantities from the infrared to the visible included polarization.

    Combining the 3D cloud generator and the 3D Monte Carlo radiative transfer model allow him to study the impact of cloud heterogeneities on the radiances, brightness temperatures of fluxes as well as their impacts on the cloud property retrievals (optical thickness, ice crystal effective diameter) from space radiometers such as MODIS, VIIRS, IIR, etc.
     

    Teaching Experience

    During the 3 years of his PhD thesis work, he taught optics, fluids mechanics, and solid mechanics to bachelor students in sciences.

    Several times per year,  at the astronomy/astrophysics exhibition center in France (Palais de l'Univers et des Sciences), he presented talks to the genral public regarding initiation to the astronomy.
     

    Dr. Fauchez gives also weekly free online courses on astronomy to a small group of students.

    Education

    Ph.D. in atmospheric physics Oct. 2010 - Sep. 2013
    University of Lille 1, Villeneuve D’Ascq, France.
    Thesis: “Effects of cloud heterogeneities on the optical and microphysical properties of cirrus clouds retrieved by the A-train captors”.
    Supervisors: Philippe Dubuisson, Céline Cornet, Frédéric Szczap.

    M.S. in spatial sciences Sep. 2008 – Jul. 2010
    Liège University Liège, Belgium.
    Thesis: The X-ray emission of the colliding wind binary V444 Cyg.
    Supervisors: Michael De Becker, Yael Naze

    B.S. in physic Sep. 2005 – Jui. 2008
    ULCO University Calais, France.
    Thesis: Study of the multiple/binary system HD150136.
    Supervisors: Eric Gosset, Yael Naze
     

    Awards

    Best PhD student talk presentation for the IREPSE 2013

    Grants

    11/01/2014 - 10/31/2016 NASA Postdoctoral Program Fellowship, NASA Postdoctoral Program, Universities Space Research Association (USRA)
    Post Doctoral researcher in Earth sciences

    Selected Publications

    Refereed

    Fauchez, T., S. Platnick, K. Meyer, et al. C. Cornet, F. Szczap, and T. Várnai. 2017. "Scale dependence of cirrus horizontal heterogeneity effects on TOA measurements – Part I: MODIS brightness temperatures in the thermal infrared." Atmospheric Chemistry and Physics, 17 (13): 8489-8508 [10.5194/acp-17-8489-2017]

    Fauchez, T., L. Rossi, and D. M. Stam. 2017. "The O2 A-Band in the Fluxes and Polarization of Starlight Reflected by Earth-Like Exoplanets." The Astrophysical Journal, 842 (1): 41 [10.3847/1538-4357/aa6e53]

    Fauchez, T. J., S. E. Platnick, O. Sourdeval, K. G. Meyer, and C. C. . 2017. " Cirrus heterogeneity effects on cloud optical properties retrieved with an optimal estimation method from MODIS VIS to TIR channels." AIP Conference Proceedings, 1810 (1): [10.1063/1.4975504 ]

    Fauchez, T., A. B. Davis, C. Cornet, et al. F. Szczap, S. Platnick, P. Dubuisson, and F. Thieuleux. 2017. "A fast hybrid (3-D/1-D) model for thermal radiative transfer in cirrus via successive orders of scattering." Journal of Geophysical Research: Atmospheres, 122 (1): 344-366 [10.1002/2016jd025607]

    Fauchez, T., P. Dubuisson, C. Cornet, et al. F. Szczap, A. Garnier, J. Pelon, and K. G. Meyer. 2015. "Impacts of cloud heterogeneities on cirrus optical properties retrieved from space-based thermal infrared radiometry." Atmospheric Measurement Techniques, 8 (2): 633-647 [10.5194/amt-8-633-2015]

    Fauchez, T., C. Cornet, P. Dubuisson, F. Szczap, and T. Rosambert. 2014. "Impact of cirrus clouds heterogeneities on top-of-atmosphere thermal infrared radiation ." Atmos. Chem. Phys., 14: 5599-5615 [10.5194/acp-14-5599-2014]

    Szczap, F., G. Yaya, T. Fauchez, et al. C. Cornet, T. Faure, O. Jourdan, and P. Dubuisson. 2014. "A flexible three-dimensional stratocumulus, cumulus and cirrus cloud generator (3DCLOUD) based on drastically simplified atmospheric equations and the Fourier transform framework ." Geosci. Model. Dev., 7: 1779-1801 [10.5194/gmdd-7-295-2014]

    Fauchez, T., C. Cornet, F. Szczap, and P. Dubuisson. 2013. "Assessment of Cloud Heterogeneities Effects on Brightness Temperatures Simulated with a 3D Monte-Carlo Code in the Thermal Infrared." AIP Conf. Proc. , 1531: 75-78 [DOI: 10.1063/1.4804711]

    Cornet, C., F. Szczap, L. C. Labonnote, et al. T. Fauchez, F. Parol, F. Thieuleux, J. Riedi, P. Dubuisson, and N. Ferlay. 2013. "Evaluation of cloud heterogeneities effects on total and polarized visible radiances as measured by POLDER/PARASOL and consequences on retrieved cloud properties." AIP Conf. Proc., 1531: 99-102 [DOI: 10.1063/1.4804717]

    Fauchez, T., M. De Becker, and Y. Naze. 2011. "The X-ray emission of the colliding wind binary V444 Cyg." Bulletin de la Société Royale des Sciences de Liège, 80: 673-677.

    Mahy, L., E. Gosset, H. Sana, et al. G. Rauw, T. Fauchez, and C. Nitschelm. 2010. "HD 150136: towards one of the most massive systems?" Proceedings of the International Astronomical Union, 6 (Symposium S272): 521-522 [DOI: 10.1017/S1743921311011276]

    Brief Bio

    Thomas Fauchez is a space research scientist employed by GESTAR/USRA at NASA GSFC in the Planetary Environments Laboratory. His research interest involve the modeling of exoplanetary atmospheres and particularly the impact of cloud coverage in simulated transmission spectra that can be observed by the future JWST NASA mission.

    Before his space research scientist position, Thomas Fauchez was a NASA Postdoctoral Program (NPP) fellow at NASA GSFC, in the Climate and Radiation laboratory under the supervision of Steven Platnick. He worked on cirrus cloud heterogeneity impacts for MODIS cloud property retrievals, in the visible and thermal infrared.

    He received his PhD in atmospheric physics at Lille University in the Laboratoire d'Optique Atmospherique (LOA) under the supervision of Pr. Philippe Dubuisson, Dr Celine Cornet and Dr Frederic Szczap (LaMP). He studied cirrus cloud heterogeneities and their impacts on the thermal infrared radiative transfer and cloud property retrievals.

    Thomas Fauchez also received a master's degree in space sciences, speciality astrophysics. His master's thesis involved the study of massive star binary systems with colliding winds in the X-rays using XMM Newton data with the GAPHE group at Liege University, Belgium.
     

    Selected Publications

    Refereed

    Fauchez, T., S. Platnick, K. Meyer, et al. C. Cornet, F. Szczap, and T. Várnai. 2017. "Scale dependence of cirrus horizontal heterogeneity effects on TOA measurements – Part I: MODIS brightness temperatures in the thermal infrared." Atmospheric Chemistry and Physics 17 (13): 8489-8508 [10.5194/acp-17-8489-2017]

    Fauchez, T., L. Rossi, and D. M. Stam. 2017. "The O2 A-Band in the Fluxes and Polarization of Starlight Reflected by Earth-Like Exoplanets." The Astrophysical Journal 842 (1): 41 [10.3847/1538-4357/aa6e53]

    Fauchez, T. J., S. E. Platnick, O. Sourdeval, K. G. Meyer, and C. C. . 2017. " Cirrus heterogeneity effects on cloud optical properties retrieved with an optimal estimation method from MODIS VIS to TIR channels." AIP Conference Proceedings 1810 (1): [10.1063/1.4975504 ]

    Fauchez, T., A. B. Davis, C. Cornet, et al. F. Szczap, S. Platnick, P. Dubuisson, and F. Thieuleux. 2017. "A fast hybrid (3-D/1-D) model for thermal radiative transfer in cirrus via successive orders of scattering." Journal of Geophysical Research: Atmospheres 122 (1): 344-366 [10.1002/2016jd025607]

    Fauchez, T., P. Dubuisson, C. Cornet, et al. F. Szczap, A. Garnier, J. Pelon, and K. G. Meyer. 2015. "Impacts of cloud heterogeneities on cirrus optical properties retrieved from space-based thermal infrared radiometry." Atmospheric Measurement Techniques 8 (2): 633-647 [10.5194/amt-8-633-2015]

    Fauchez, T., C. Cornet, P. Dubuisson, F. Szczap, and T. Rosambert. 2014. "Impact of cirrus clouds heterogeneities on top-of-atmosphere thermal infrared radiation ." Atmos. Chem. Phys. 14 5599-5615 [10.5194/acp-14-5599-2014]

    Szczap, F., G. Yaya, T. Fauchez, et al. C. Cornet, T. Faure, O. Jourdan, and P. Dubuisson. 2014. "A flexible three-dimensional stratocumulus, cumulus and cirrus cloud generator (3DCLOUD) based on drastically simplified atmospheric equations and the Fourier transform framework ." Geosci. Model. Dev. 7 1779-1801 [10.5194/gmdd-7-295-2014]

    Fauchez, T., C. Cornet, F. Szczap, and P. Dubuisson. 2013. "Assessment of Cloud Heterogeneities Effects on Brightness Temperatures Simulated with a 3D Monte-Carlo Code in the Thermal Infrared." AIP Conf. Proc. 1531 75-78 [DOI: 10.1063/1.4804711]

    Cornet, C., F. Szczap, L. C. Labonnote, et al. T. Fauchez, F. Parol, F. Thieuleux, J. Riedi, P. Dubuisson, and N. Ferlay. 2013. "Evaluation of cloud heterogeneities effects on total and polarized visible radiances as measured by POLDER/PARASOL and consequences on retrieved cloud properties." AIP Conf. Proc. 1531 99-102 [DOI: 10.1063/1.4804717]

    Fauchez, T., M. De Becker, and Y. Naze. 2011. "The X-ray emission of the colliding wind binary V444 Cyg." Bulletin de la Société Royale des Sciences de Liège 80 673-677

    Mahy, L., E. Gosset, H. Sana, et al. G. Rauw, T. Fauchez, and C. Nitschelm. 2010. "HD 150136: towards one of the most massive systems?" Proceedings of the International Astronomical Union 6 (Symposium S272): 521-522 [DOI: 10.1017/S1743921311011276]

                                                                                                                                                                                            
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