Dr. Joël Arnault

research associate
Regional Climate and Hydrology
Phone: +49 8821 183-253

Research topics and accomplishments

  • Land-atmosphere interactions and hydrologic cycle at regional scale

  • Atmospheric-hydrological modeling improvement with cosmic-ray neutron soil moisture information

  • Development of a water tracing procedure and a water budget calculation tool in a coupled regional model

  • Development of a stable water isotopologue modeling procedure in a coupled regional model

  • Gravity wave dynamics and turbulence

  • Tropical cyclogenesis

  • Development of momentum, energy and vorticity budget calculation tools in a regional model

current research projects

List of first author publications

Arnault J., A. M. Mwanthi, T. Portele, L. Li, T. Rummler, B. Fersch, M. A. Hassan, T. K. Bahaga, Z. Zhang, E. M. Mortey, I. C. Achugbu, H. Moutahir, S. Sy, J. Wei, P. Laux, S. Sobolowski, and H. Kunstmann, 2023: Regional water cycle sensitivity to afforestation: synthetic numerical experiments for tropical Africa. Front. Clim. 5:1233536. https://doi.org/10.3389/fclim.2023.1233536


Arnault J., K. Niezgoda, G. Jung, A. Hahn, M. Zabel, E. Schefuß, and H. Kunstmann, 2022: Disentangling the contribution of moisture source change to isotopic proxy signatures: Deuterium tracing with WRF-Hydro-iso-tag and application to southern African Holocene sediment archives, J. Clim., 35, 3855-3879. https://doi.org/10.1175/JCLI-D-22-0041.1


Arnault J., G. Jung, B. Haese, B. Fersch, T. Rummler, J. Wei, Z. Zhang, H. Kunstmann, 2021: A joint soil-vegetation-atmospheric modeling procedure of water isotopologues: Implementation and application to different climate zones with WRF-Hydro-iso. J. Adv. Model. Earth Syst., 13, e2021MS002562. https://doi.org/10.1029/2021MS002562


Arnault J., B. Fersch, T. Rummler, Z. Zhang, G. M. Quenum, J. Wei, M. Graf, P. Laux, and H. Kunstmann, 2021: Lateral terrestrial water flow contribution to summer precipitation at continental scale – A comparison between Europe and West Africa with WRF-Hydro-tag ensembles. Hydrol. Process. 35, e14183. https://doi.org/10.1002/hyp.14183


Arnault J., J. Wei, T. Rummler, B. Fersch, Z. Zhang, G. Jung, S. Wagner, and H. Kunstmann, 2019: A joint soilvegetationatmospheric water tagging procedure with WRFHydro: Implementation and application to the case of precipitation partitioning in the upper Danube river basin. Water Resour. Res., 55, 6217-6243. https://doi.org/10.1029/2019WR024780


Arnault J., T. Rummler, F. Baur, S. Lerch, S. Wagner, B. Fersch, Z. Zhang, N. Kerandi, C. Keil, and H. Kunstmann, 2018: Precipitation sensitivity to the uncertainty of terrestrial water flow in WRF-Hydro – An ensemble analysis for Central Europe. J. Hydrometeor., 19, 1007–1025. https://doi.org/10.1175/JHM-D-17-0042.1


Arnault, J., R. Knoche, J. Hui, and H. Kunstmann, 2016: Evaporation tagging and atmospheric water budget analysis with WRF: A regional precipitation recycling study for West Africa, Water Resour. Res., 52, 1544–1567. https://doi.org/10.1002/2015WR017704


Arnault, J., S. Wagner, T. Rummler, B. Fersch, J. Bliefernicht, S. Andresen, and H. Kunstmann, 2016: Role of runoff-infiltration partitioning and resolved overland flow on land-atmosphere feedbacks: A case-study with the WRF-Hydro coupled modeling system for West Africa, J. Hydrometeor., 17, 1489–1516. https://doi.org/10.1175/JHM-D-15-0089.1


Arnault, J., 2013: Large-scale dynamical influence of a gravity wave generated over the Antarctic Peninsula - regional modelling and budget analysis, Tellus A, 65, 20254. https://doi.org/10.3402/tellusa.v65i0.20254


Arnault, J., and S. Kirkwood, 2012: Dynamical influence of gravity waves generated by the Vestfjella Mountains in Antarctica: radar observations, fine-scale modeling and kinetic energy budget analysis, Tellus A, 64, 17261. https://doi.org/10.3402/tellusa.v64i0.17261


Arnault, J., and F. Roux, 2011: Characteristics of African easterly waves associated with tropical cyclogenesis in the Cape Verde islands region in July – August – September of 2004-2008, Atm. Res., 100, 61-82. https://doi.org/10.1016/j.atmosres.2010.12.028


Arnault, J., and F. Roux, 2010: Comparison between two case-studies of developing and non-developing African easterly waves: absolute vertical vorticity budget, Mon. Wea. Rev., 138, 1420-1445. https://doi.org/10.1175/2009MWR3120.1


Arnault, J., and F. Roux, 2010: Failed cyclogenetic evolution of a West-African monsoon perturbation observed during AMMA SOP-3, J. Atmos. Sci., 67, 1863-1883. https://doi.org/10.1175/2010JAS3203.1


Arnault, J., and F. Roux, 2009: Case-study of a developing African easterly wave: an energetic point of view, J. Atmos. Sci., 66, 2991-3020. https://doi.org/10.1175/2009JAS3009.1


complete publication list via ORCID

Curriculum vitae

  • 2022-2025 (5th Postdoc): Coupled distributed modeling of soil moisture, snow and atmosphere interactions – tuned by cosmic-ray neutron sensing, Augsburg University (DFG, Cosmic Sense, FOR 2694)
  • 2019-2022 (4th Postdoc): Investigating southern African Holocene climate - bridging from the early Holocene to today, KIT/IMK-IFU, Garmisch-Partenkirchen (DFG, grant AR 1183/2-1)
  • 2015-2019 (3rd Postdoc): Role of terrestrial hydrology on precipitation, KIT/IMK-IFU, Garmisch-Partenkirchen (DFG, Waves to Weather, SFB 165)
  • 2013-2015 (2nd Postdoc): Improving the representation of West African climate with a fully coupled atmospheric-hydrological modeling system, Augsburg University (BMBF, WASCAL)
  • 2011-2013 (1st Postdoc): Dynamical influence of gravity waves observed in polar regions, Swedish Institute of Space Physics (IRF), Kiruna, Sweden
  • 2009-2010: World tour - on foot, by bike, on horseback, by camel from Marseille to Zavkhanmadal ( link)
  • 2006-2009 (PhD thesis): Cyclogenetic evolution of West African / East Atlantic convective disturbances, discipline Océan/Atmosphère, Université Paul Sabatier, Laboratoire d’Aérologie, Toulouse, France, PhD supervisor: Pr. Frank Roux
  • 2006 (Master thesis): Imaging of atmospheric waves and fine-scale structures using radar interferometry, IRF, Kiruna, Sweden
  • 2005-2006 (Master of Research): Signal Image Acoustique Optimisation
  • 2002-2006 (Ecole Nationale Supérieure de l’Aéronautique et de l’Espace, SUPAERO): the French Engineering School of Aeronautics and Space in Toulouse, France – Space Imaging In-depth course
  • 2001-2002: Special preparation in Math and Physics for the entrance exam to French Engineering Schools ("Grandes Ecoles"), Lycée Thiers, Marseille, France