Sciences and Exploration Directorate

Jelena Marshak


Org Code: 613

Mail Code: 610.1
Greenbelt, MD 20771


Brief Bio

Support the Science Data Processing Branch within the Software Engineering Division through the collaboration with the GMAO project.  The major task consists of setting up and performing seasonal climate prediction experiments using GEOS-5 forecast system on high-end computing resources.  The GEOS-5 Atmosphere-Ocean coupled GCM near real-time coupled ensemble forecasts are conducted on a weekly to monthly basis to study seasonal climate prediction.  Previous experience includes over 20 years of scientific programming, data management, visualization, and parallel processing experience working for NASA: support for modeling studies of Arctic Ocean and high latitude oceanic climate variability including the application of parallel processing techniques, help desk activities for NCCS Thunderhead dual Xeon Beowulf Cluster Machine, compiling the first version of Hilbert-Huang Transform data analysis and visualization package of MATLAB routines.


Computer scientist

NASA GSFC - Greenbelt, MD

June 2001 - Present


Sr. scientific programmer/analyst

General Sciences Corporation - Beltsville, MD

December 1993 - May 2001



Tartu Bread Co. - Tartu, Estonia

June 1988 - 1989



Central Statistical Department - Tartu, Estonia

February 1979 - May 1988



B.S., Computer Information Science, University of Maryland UC, USA
M.S., B.S. Applied Mathematics, Tartu University, Estonia


Global Modeling Assimilation Office Award, 2018
NASA GSFC Special Act TOA Award, 2013
NASA GSFC ISD 2006/2007 Performance Award, 2007
NASA GSFC Five, Ten and Fifteen Year Service Awards, 2006, 2011, 2016
NASA GSFC Performance Awards, 2003-2018
The award in recognition of performance and service to GSC during fiscal year 2000
The award in recognition of performance and service to GSC during fiscal year 1999

Special Experience

Statistical Methods and Data Analysis, Applied linear statistical models, 2009, graduate courses at Applied and Computational Mathematics, Johns Hopkins University, USA
Ugro-Finnish Languages and German philology seminars, 1991,  Department of History-Philology Sciences, Goettingen University, Germany



Borovikov, A., R. Cullather, R. Kovach, et al. J. Marshak, G. Vernieres, Y. Vikhliaev, B. Zhao, and Z. Li. 2017. GEOS-5 seasonal forecast system Climate Dynamics [10.1007/s00382-017-3835-2]

Kirtman, B. P., D. Min, J. M. Infanti, et al. I. J. Kinter, D. A. Paolino, Q. Zhang, H. van den Dool, S. Saha, M. Pena Mendez, E. Becker, P. Peng, P. Tripp, J. Huang, D. G. DeWitt, M. K. Tippett, A. G. Barnston, S. Li, A. Rosati, S. D. Schubert, M. Rienecker, M. J. Suarez, Z. Li, J. Marshak, Y.-K. Lim, J. Tribbia, K. Pegion, W. J. Merryfield, B. Denis, and E. F. Wood. 2014. The North American Multimodel Ensemble: Phase-1 Seasonal-to-Interannual Prediction; Phase-2 toward Developing Intraseasonal Prediction Bull. Amer. Meteor. Soc 95 (4): 585-601 [10.1175/BAMS-D-12-00050.1]

Ham, Y.-G., M. M. Rienecker, M. J. Suarez, et al. Y. V. Vikhliaev, B. Zhao, J. Marshak, G. R. Vernieres, and S. D. Schubert. 2014. Decadal prediction skill in the GEOS-5 forecast system Clim Dyn 42 (1-2): 1-20 [10.1007/s00382-013-1858-x]