Santha Akella

Santha Akella

  • RESEARCH AST, OCEANOGRAPHIC STUDIES
  • 301.614.5687
  • NASA/GSFC
  • Mail Code: 610.1
  • Greenbelt , MD 20771
  • Employer: NASA
  • Brief Bio

    Dr. Akella works at the Global Modeling and Assimilation Office (GMAO). His research focuses on the development, testing and operational integration of the next generation atmosphere-ocean coupled, Integrated Earth Analysis System (IESA), with emphasis on the ocean and ocean-atmosphere coupling.

    Education

    • Ph.D., Applied Mathematics & Computational Science, Florida State Univ., 2006
    • M.S., Mathematics, Florida State Univ., 2002
    • B.S., Ocean Eng. & Naval Architecture, India, 2000

    Positions/Employment

    10/2018 - Present

    Research Oceanographer

    GSFC, NASA
    12/2010 - 10/2018

    Support Scientist

    SSAI Inc., GSFC, NASA
    4/2008 - 11/2010

    Postdoc Researcher

    Johns Hopkins Univ., Baltimore, MD
    4/2007 - 3/2008

    Postdoc Researcher

    Texas A&M Univ., College Station, TX
    6/2006 - 3/2007

    Postdoc Researcher

    University of Pennsylvania, Philadelphia, PA
    8/2000 - 5/2006

    Teaching and Graduate Research Assistant

    Florida State Univ., Tallahassee, FL

    Publications

    Refereed

    Gentemann, C. L., and S. Akella. 2018. "Evaluation of NASA GEOS-ADAS Modeled Diurnal Warming Through Comparisons to SEVIRI and AMSR2 SST Observations." Journal of Geophysical Research: Oceans, [10.1002/2017jc013186]

    Akella, S., R. Todling, and M. J. Suarez. 2017. "Assimilation for skin SST in the NASA GEOS atmospheric data assimilation system." Quarterly Journal of the Royal Meteorological Society, 143 (703): 1032-1046 [10.1002/qj.2988]

    Gelaro, R., W. McCarty, M. J. Suárez, et al. R. Todling, A. Molod, L. Takacs, C. Randles, A. Darmenov, M. G. Bosilovich, R. Reichle, K. Wargan, L. Coy, R. Cullather, C. Draper, S. Akella, V. Buchard, A. Conaty, A. da Silva, W. Gu, G.-K. Kim, R. Koster, R. Lucchesi, D. Merkova, J. E. Nielsen, G. Partyka, S. Pawson, W. Putman, M. Rienecker, S. D. Schubert, M. Sienkiewicz, and B. Zhao. 2017. "The Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2)." Journal of Climate, 30: 5419–5454 [10.1175/jcli-d-16-0758.1]

    Brassington, G., M. Martin, H. Tolman, et al. S. Akella, M. Balmeseda, C. Chambers, E. Chassignet, J. Cummings, Y. Drillet, P. Jansen, P. Laloyaux, D. Lea, A. Mehra, I. Mirouze, H. Ritchie, G. Samson, P. Sandery, G. Smith, M. Suarez, and R. Todling. 2015. "Progress and challenges in short- to medium-range coupled prediction." Journal of Operational Oceanography, 8 (sup2): s239-s258 [10.1080/1755876x.2015.1049875]

    Vernieres, G. R., R. M. Kovach, C. L. Keppenne, et al. S. R. Akella, L. Brucker, and E. P. Dinnat. 2014. "The impact of the assimilation of Aquarius sea surface salinity data in the GEOS ocean data assimilation system." J. Geophys. Res. Oceans, 119 (10): 6974-6987 [10.1002/2014JC010006]

    Akella, S., A. Datta-Gupta, and Y. Efendiev. 2011. "ASSIMILATION OF COARSE-SCALEDATAUSINGTHE ENSEMBLE KALMAN FILTER." International Journal for Uncertainty Quantification, 1 (1): 49-76 [10.1615/int.j.uncertaintyquantification.v1.i1.40]

    Chen, X., S. Akella, and I. M. Navon. 2011. "A dual-weighted trust-region adaptive POD 4-D Var applied to a finite-volume shallow water equations model on the sphere." International Journal for Numerical Methods in Fluids, 68 (3): 377-402 [10.1002/fld.2523]

    Akella, S. R. 2011. "Reservoir Multiscale Data Assimilation Using the Ensemble Kalman Filter." Applied Mathematics, 02 (02): 165-180 [10.4236/am.2011.22019]

    Akella, S., and I. M. Navon. 2008. "Different approaches to model error formulation in 4D-Var: a study with high-resolution advection schemes." Tellus A, 61 (1): 112-128 [10.1111/j.1600-0870.2008.00362.x]

    Akella, S., and I. M. Navon. 2005. "A comparative study of the performance of high resolution advection schemes in the context of data assimilation." International Journal for Numerical Methods in Fluids, 51 (7): 719-748 [10.1002/fld.1145]

    Mandal, N., and S. R. Akella. 2000. "A Finite Difference Model for Prediction of Welding Thermal History (Part 1)." Journal of the Mechanical Behavior of Materials, 11 (5): [10.1515/jmbm.2000.11.5.381]

    Non-Refereed

    Kim, J. G., S. R. Akella, A. M. Da Silva, R. Todling, and W. R. Mccarty. 2018. "Preliminary evaluation of influence of aerosols on the simulation of brightness temperature in the NASA’s Goddard Earth Observing System Atmospheric Data Assimilation Syste." NASA Technical Report Series on Global Modeling and Data Assimilation, NASA/TM-2018-104606 49: 44pp.

    Akella, S., and M. Suarez. 2018. "The Atmosphere-Ocean Interface Layer of NASA’s Goddard Earth Observing System Model and Data Assimilation System." NASA Technical Report Series on Global Modeling and Data Assimilation 51 (NASA/TM-2018-104606): 42pp.

    Akella, S. R., R. Todling, and M. J. Suarez. 2016. "Estimation of the Ocean Skin Temperature using the NASA GEOS Atmospheric Data Assimilation System." NASA Technical Report Series on Global Modeling and Data Assimilation, NASA/TM-2016-10460 44: 88pp.

    Bosilovich, M. G., S. R. Akella, L. Coy, et al. R. I. Cullather, C. S. Draper, R. Gelaro, R. M. Kovach, Q. Liu, A. M. Molod, P. M. Norris, K. Wargan, C. Yang, R. H. Reichle, L. L. Takacs, Y. V. Vikhliaev, S. C. Bloom, A. Collow, S. Firth, G. J. Labow, G. S. Partyka, S. Pawson, O. Reale, S. D. Schubert, and M. J. Suarez. 2015. "MERRA-2: Initial Evaluation of the Climate." NASA Technical Report Series on Global Modeling and Data Assimilation 43 (NASA/TM–2015–10): 139 pp.

    Awards

    • Travel award to present invited talk ``Skin SST assimilation using GEOS-ADAS" at the International workshop on coupled data assimilation, Toulouse, France, October, 2016 [http://www.meteo.fr/cic/meetings/2016/CDAW2016/]
    • Scientific achievement award for successfully implementing skin temperature analysis in GEOS-5, January, 2016

     

    Brief Bio

    Dr. Akella works at the Global Modeling and Assimilation Office (GMAO). His research focuses on the development, testing and operational integration of the next generation atmosphere-ocean coupled, Integrated Earth Analysis System (IESA), with emphasis on the ocean and ocean-atmosphere coupling.

    Publications

    Refereed

    Gentemann, C. L., and S. Akella. 2018. "Evaluation of NASA GEOS-ADAS Modeled Diurnal Warming Through Comparisons to SEVIRI and AMSR2 SST Observations." Journal of Geophysical Research: Oceans [10.1002/2017jc013186]

    Akella, S., R. Todling, and M. J. Suarez. 2017. "Assimilation for skin SST in the NASA GEOS atmospheric data assimilation system." Quarterly Journal of the Royal Meteorological Society 143 (703): 1032-1046 [10.1002/qj.2988]

    Gelaro, R., W. McCarty, M. J. Suárez, et al. R. Todling, A. Molod, L. Takacs, C. Randles, A. Darmenov, M. G. Bosilovich, R. Reichle, K. Wargan, L. Coy, R. Cullather, C. Draper, S. Akella, V. Buchard, A. Conaty, A. da Silva, W. Gu, G.-K. Kim, R. Koster, R. Lucchesi, D. Merkova, J. E. Nielsen, G. Partyka, S. Pawson, W. Putman, M. Rienecker, S. D. Schubert, M. Sienkiewicz, and B. Zhao. 2017. "The Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2)." Journal of Climate 30 5419–5454 [10.1175/jcli-d-16-0758.1]

    Brassington, G., M. Martin, H. Tolman, et al. S. Akella, M. Balmeseda, C. Chambers, E. Chassignet, J. Cummings, Y. Drillet, P. Jansen, P. Laloyaux, D. Lea, A. Mehra, I. Mirouze, H. Ritchie, G. Samson, P. Sandery, G. Smith, M. Suarez, and R. Todling. 2015. "Progress and challenges in short- to medium-range coupled prediction." Journal of Operational Oceanography 8 (sup2): s239-s258 [10.1080/1755876x.2015.1049875]

    Vernieres, G. R., R. M. Kovach, C. L. Keppenne, et al. S. R. Akella, L. Brucker, and E. P. Dinnat. 2014. "The impact of the assimilation of Aquarius sea surface salinity data in the GEOS ocean data assimilation system." J. Geophys. Res. Oceans 119 (10): 6974-6987 [10.1002/2014JC010006]

    Akella, S., A. Datta-Gupta, and Y. Efendiev. 2011. "ASSIMILATION OF COARSE-SCALEDATAUSINGTHE ENSEMBLE KALMAN FILTER." International Journal for Uncertainty Quantification 1 (1): 49-76 [10.1615/int.j.uncertaintyquantification.v1.i1.40]

    Chen, X., S. Akella, and I. M. Navon. 2011. "A dual-weighted trust-region adaptive POD 4-D Var applied to a finite-volume shallow water equations model on the sphere." International Journal for Numerical Methods in Fluids 68 (3): 377-402 [10.1002/fld.2523]

    Akella, S. R. 2011. "Reservoir Multiscale Data Assimilation Using the Ensemble Kalman Filter." Applied Mathematics 02 (02): 165-180 [10.4236/am.2011.22019]

    Akella, S., and I. M. Navon. 2008. "Different approaches to model error formulation in 4D-Var: a study with high-resolution advection schemes." Tellus A 61 (1): 112-128 [10.1111/j.1600-0870.2008.00362.x]

    Akella, S., and I. M. Navon. 2005. "A comparative study of the performance of high resolution advection schemes in the context of data assimilation." International Journal for Numerical Methods in Fluids 51 (7): 719-748 [10.1002/fld.1145]

    Mandal, N., and S. R. Akella. 2000. "A Finite Difference Model for Prediction of Welding Thermal History (Part 1)." Journal of the Mechanical Behavior of Materials 11 (5): [10.1515/jmbm.2000.11.5.381]

    Non-Refereed

    Kim, J. G., S. R. Akella, A. M. Da Silva, R. Todling, and W. R. Mccarty. 2018. "Preliminary evaluation of influence of aerosols on the simulation of brightness temperature in the NASA’s Goddard Earth Observing System Atmospheric Data Assimilation Syste." NASA Technical Report Series on Global Modeling and Data Assimilation, NASA/TM-2018-104606 49 44pp

    Akella, S., and M. Suarez. 2018. "The Atmosphere-Ocean Interface Layer of NASA’s Goddard Earth Observing System Model and Data Assimilation System." NASA Technical Report Series on Global Modeling and Data Assimilation 51 (NASA/TM-2018-104606): 42pp.

    Akella, S. R., R. Todling, and M. J. Suarez. 2016. "Estimation of the Ocean Skin Temperature using the NASA GEOS Atmospheric Data Assimilation System." NASA Technical Report Series on Global Modeling and Data Assimilation, NASA/TM-2016-10460 44 88pp

    Bosilovich, M. G., S. R. Akella, L. Coy, et al. R. I. Cullather, C. S. Draper, R. Gelaro, R. M. Kovach, Q. Liu, A. M. Molod, P. M. Norris, K. Wargan, C. Yang, R. H. Reichle, L. L. Takacs, Y. V. Vikhliaev, S. C. Bloom, A. Collow, S. Firth, G. J. Labow, G. S. Partyka, S. Pawson, O. Reale, S. D. Schubert, and M. J. Suarez. 2015. "MERRA-2: Initial Evaluation of the Climate." NASA Technical Report Series on Global Modeling and Data Assimilation 43 (NASA/TM–2015–10) 139 pp.

                                                                                                                                                                                            
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