Sciences and Exploration Directorate

Jules Kouatchou

(COMPUTATIONAL SCIENTIST)

 jules.kouatchou-1@nasa.gov

 301.286.6059

Org Code: 606

NASA/GSFC
Mail Code: 606
Greenbelt, MD 20771

Employer: SCIENCE SYSTEMS AND APPLICATIONS INC

Positions/Employment


Chief Programmer/Analyst

SSAI - Lanham, MD

May 2012 - Present

  • Create a GEOS-5 module that runs as a CTM (GEOS-5 CTM)
  • Maintain the GEOS-5 CTM code to include new components and to facilitate the use of new forcing datasets
  • Perform GEOS-5 CTM production runs to validate code changes
  • Write Python scripts to visualize GEOS-5 CTM output data
  • Maintain the GMI code to include new capabilities
  • Maintain a Python distribution for scientific computing and data analysis
  • Write technical documentations


Computational Scientist

AMTI - Arlington, VA

January 2004 - April 2012

  • Analyzed the parallel performance of the GMI code
  • Profiled and ported the GMI code on available parallel computers
  • Studied of the GMI code reproducibility
  • Componentized the GMI code to make it ESMF compliant
  • Incorporated new modules and adding new diagnostics capabilities to the GMI code
  • Added GMI related modules in GEOS-5
  • Modified GEOS-5 to be able to run several instances of GMI
  • Wrote technical documentations related to the GMI code modifications and use


Research Scientist

Morgan State University - Baltimore, MD

January 1998 - January 2004

Worked at NASA Goddard Space Flight Center on projects related to

  • The benchmarking of weather/climate model codes on parallel computers
  • The development of parallel algorithms for the numerical solution of steady-state partial differential equations
  • The implementation of numerical atmospheric models on high performance computers

Teaching Experience


Instructor, School of Engineering, Morgan State University
Responsible of the undergraduate course Discrete Systems (EEGR.322, Fall 2001, 2002, 2003 and Spring 2002, 2003)
Responsible of the computational section of the graduate course Advanced Analytical and Computational Engineering Mathematics (EEGR.505, Fall 1998, 1999, 2000, 2001, 2002 and 2003).

Teaching Assistant, Department of Mathematics, The George Washington University
Conduct recitations and grade quizzes. (01/1994 -05/1997).

Instructor, Department of Mathematics, The George Washington University
Responsible of the courses General Mathematics (Summer 94), and Pre-Calculus (Summer 95).

Education


PhD, Scientific Computing, Department of Mathematics, The George Washington University, 1/98
MS, Electrical Engineering, Telecom Paris, 7/93
BS, Applied Mathematics, Université de Montpellier II, 6/91

Awards


  1. Tetra Tech AMT, Achievement Award, 2011
  2. NASA RHG Exceptional Achievement SCIENCE TEAM, 2010
  3. Advanced Management Technology Inc. Achievement Award, 2005

Publications


Refereed

Eastham, S. D., M. S. Long, C. A. Keller, et al. E. Lundgren, R. M. Yantosca, J. Zhuang, C. Li, C. J. Lee, M. Yannetti, B. M. Auer, T. L. Clune, J. Kouatchou, W. M. Putman, M. A. Thompson, A. L. Trayanov, A. M. Molod, R. V. Martin, and D. J. Jacob. 2018. GEOS-Chem High Performance (GCHP v11-02c): a next-generation implementation of the GEOS-Chem chemical transport model for massively parallel applications Geoscientific Model Development 11 (7): 2941-2953 [10.5194/gmd-11-2941-2018]

Kouatchou, J., T. L. Clune, B. M. Auer, J. E. Nielsen, and A. M. Molod. 2017. Parallel Performance Analysis of Two Infrastructure Frameworks for GMI Chemistry American Meteorological Society’s Third Symposium on High Performance Computing for Weather, Water, and Climate

Liu, H., D. B. Considine, L. W. Horowitz, et al. J. H. Crawford, J. M. Rodriguez, S. E. Strahan, M. R. Damon, S. D. Steenrod, X. Xu, J. Kouatchou, C. Carouge, and R. M. Yantosca. 2016. Using beryllium-7 to assess cross-tropopause transport in global models Atmos. Chem. Phys. Discuss. 15 (18): 26131-26189 [10.5194/acp-16-4641-2016]

Elshorbany, Y. F., B. Duncan, S. Strode, J. Wang, and J. Kouatchou. 2016. The description and validation of the computationally Efficient CH4–CO–OH (ECCOHv1.01) chemistry module for 3-D model applications Geoscientific Model Development 9 799-822 [doi:10.5194/gmd-9-799-2016]

Strode, S. A., B. N. Duncan, E. A. Yegorova, et al. J. Kouatchou, J. R. Ziemke, and A. R. Douglass. 2015. Implications of carbon monoxide bias for methane lifetime and atmospheric composition in chemistry climate models Atmospheric Chemistry and Physics 15 11789–11805 [10.5194/acp-15-11789-2015]

Kouatchou, J., A. Da Silva, and A. Oloso. 2015. SIVO-PyD: A Python Distribution for Scientific Computing Visualization NASA Tech Brief GSC-16530-1

Kouatchou, J., and A. O. Oloso. 2014. Portable Distributed Scripts (PoDS) NASA Tech Brief GSC-16531-1

Clune, T. L., K.-S. Kuo, S. Freeman, et al. R. Burns, C. A. Cruz, and J. Kouatchou. 2013. Tool for Automated Retrieval of Generic Event Tracks (TARGET) NASA Tech Brief GSC-16665-1

Meskhidze, N., R. Sotiropoulou, A. Nenes, J. Kouatchou, and J. M. Rodriguez. 2007. Aerosol-cloud interactions in the NASA GMI: model development and indirect forcing assessments Atmospheric Chemistry and Physics [10.5194/acpd-7-14295-2007]

Kouatchou, J. 2003. Comparison of time and spatial collocation methods for the heat equation Journal of Computational and Applied Mathematics 150 (1): 129-141 [10.1016/s0377-0427(02)00656-8]

Zhang, J., J. Kouatchou, and M. Othman. 2002. On cyclic reduction and finite difference schemes Journal of Computational and Applied Mathematics 145 (1): 213-222 [10.1016/s0377-0427(01)00576-3]

Zhang, J., J. Kouatchou, and L. Ge. 2002. A family of fourth-order difference schemes on rotated grid for two-dimensional convection–diffusion equation Mathematics and Computers in Simulation 59 (5): 413-429 [10.1016/s0378-4754(01)00418-9]

Halem, M., J. Kouatchou, P. M. Norris, M. Rancic, and J. V. Geiger. 2002. Cloud field assimilation using simulated Triana satellite data Advances in Space Research 30 (11): 2447-2454

Kouatchou, J. 2001. Finite differences and collocation methods for the solution of the two-dimensional heat equation Numerical Methods for Partial Differential Equations 17 (1): 54-63

Kouatchou, J. 2001. Parallel implementation of a high-order implicit collocation method for the heat equation Mathematics and Computers in Simulation 54 (6): 509-519 [10.1016/s0378-4754(00)00280-9]

Halem, M., A. Hudson, and J. Kouatchou. 2001. Chapter 5 A retrospective analysis of the pioneering data assimilation experiments with the Mintz-Arakawa general circulation model Circulation Model Development 165-179 [10.1016/s0074-6142(00)80053-4]

Kouatchou, J., M. Rancic, P. Norris, and J. Geiger. 2000. Implementation of an eta belt domain on parallel systems Proceedings 15th International Parallel and Distributed Processing Symposium. IPDPS 2001 [10.1109/ipdps.2001.925173]

Zhang, J., L. Ge, and J. Kouatchou. 2000. A two colorable fourth-order compact difference scheme and parallel iterative solution of the 3D convection diffusion equation Mathematics and Computers in Simulation 54 (1-3): 65-80 [10.1016/s0378-4754(00)00205-6]

Kouatchou, J., and J. Zhang. 2000. Optimal injection operator and high order schemes for multigrid solution of 3D poisson equation International Journal of Computer Mathematics 76 (2): 173-190 [10.1080/00207160008805018]

Halem, M., J. Kouatchou, and A. Hudson. 2000. A Retrospective Analysis of the Pioneering Data Assimilation Experiments with the Mintz-Arakawa General Circulation Model General Circulation Model Development: Past, Present, and Future 54 165-179

Dorband, J., J. Kouatchou, J. Michalakes, and U. Ranawake. 1999. Implementing MM5 on NASA Goddard Space Flight Center computing systems: a performance study Proceedings. Frontiers '99. Seventh Symposium on the Frontiers of Massively Parallel Computation [10.1109/fmpc.1999.750601]

Kouatchou, J. 1998. Asymptotic Stability Of A 9-Point Multigrid Algorithm For Convection-Diffusion Equations Electronic transactions on numerical analysis 6

Kouatchou, J. 1998. A dynamic injection operator in a multigrid solution of convection-diffusion equations Inter. Journal for Numerical Methods in Fluids 26 (10): 1205-1216

Gupta, M. M., J. Kouatchou, and J. Zhang. 1997. Comparison of Second- and Fourth-Order Discretizations for Multigrid Poisson Solvers Journal of Computational Physics 132 (2): 226-232 [10.1006/jcph.1996.5466]

Liau, B., J. Lutton, and J. Kouatchou. 1994. Pricing a network service in a competitive environment Teletraffic Science and Engineering 1195-1206 [10.1016/b978-0-444-82031-0.50121-9]

Non-Refereed

Kouatchou, J., A. Molod, J. E. Nielsen, and T. Clune. 2015. GEOS-5 Chemistry Transport Model User's Guide GMAO Office Note 8

Sotiropoulou, R., N. Meskhidze, J. Kouatchou, and A. Nenes. 2011. Sensitivity of cloud radiative forcing to cloud formation parameterization under three different meteorological fields 2011 European Aerosol Conference