Dr. Daniel Holdaway

Dr. Daniel Holdaway

  • RESEARCH ASSOCIATE
  • 301.614.6158
  • NASA/GSFC
  • Mail Code: 610.1
  • Greenbelt , MD 20771
  • Employer: UNIVERSITIES SPACE RESEARCH ASSOCIATION
  • Brief Bio

    Daniel Holdaway joined NASA's Global Modeling and Assimilation Office in February 2011. Since then he has worked in the atmospheric data assimilation group and specializes in the development of the tangent linear and adjoint versions of GEOS-5. He has developed the linearizations of the convection, cloud, radiation, aerosol and boundary layer schemes as well as implemented a new tracer advection linearization. The adjoint of GEOS-5 is one of the most capable in the World and is used for computing observations impacts, sensitivity to initial conditions and for 4DVAR data assimilation.

    Daniel collaborates with researchers within NASA and at other institutions on a range of sensitivity studies. He looks at the events that lead to sudden stratospheric warming, how dust interacts with forming tropical cyclones over Saharan Africa and how upper level winds affect the steering of Atlantic hurricanes.

    Publications

    Refereed

    Holdaway, D., and Y. Yang. 2016. "Study of the Effect of Temporal Sampling Frequency on DSCOVR Observations Using the GEOS-5 Nature Run Results (Part I): Earth’s Radiation Budget." Remote Sens., 8 (2): 98 [10.3390/rs8020098]

    Holdaway, D., and Y. Yang. 2016. "Study of the Effect of Temporal Sampling Frequency on DSCOVR Observations Using the GEOS-5 Nature Run Results (Part II): Cloud Coverage." Remote Sensing, 8 (5): [10.3390/rs8050431]

    Holdaway, D. R., and J. Kent. 2015. "Assessing the tangent linear behaviour of common tracer transport schemes and their use in a linearised atmospheric general circulation model ." Tellus A, 67: 27895 [10.3402/tellusa.v67.27895]

    Holdaway, D., R. M. Errico, R. Gelaro, J. G. Kim, and R. B. Mahajan. 2015. "A Linearized Prognostic Cloud Scheme in NASA’s Goddard Earth Observing System Data Assimilation Tools." Monthly Weather Review, 143 (10): 4198-4219 [10.1175/MWR-D-15-0037.1]

    Holdaway, D. R., and R. M. Errico. 2014. "Using Jacobian sensitivities to assess a linearization of the relaxed Arakawa-Schubert convection scheme." Q.J.R. Meteorol. Soc., 140 (681): 1319-1332 [10.1002/qj.2210]

    Holdaway, D. R., R. M. Errico, R. Gelaro, and J. G. Kim. 2014. "Inclusion of Linearized Moist Physics in NASA’s Goddard Earth Observing System Data Assimilation Tools." Mon. Weather Rev., 142 (1): 414-433 [10.1175/MWR-D-13-00193.1]

    Holdaway, D. R., J. Thuburn, and N. Wood. 2013. "Comparison of Lorenz and Charney–Phillips vertical discretisations for dynamics–boundary layer coupling. Part II: Transients." Quarterly Journal of the Royal Meteorological Society, 139 (673): 1087–1098 [10.1002/qj.2017]

    Holdaway, D. R., J. Thuburn, and N. Wood. 2013. "Comparison of Lorenz and Charney–Phillips vertical discretisations for dynamics–boundary layer coupling. Part I: Steady states." Quarterly Journal of the Royal Meteorological Society, 139 (673): 1073-1086 [10.1002/qj.2016]

    Holdaway, D. R., J. Thuburn, and N. Wood. 2007. "On the relation between order of accuracy, convergence rate and spectral slope for linear numerical methods applied to multiscale problems." International Journal for Numerical Methods in Fluids, 56 (8): 1297-1303 [10.1002/fld.1644]

    Talks, Presentations and Posters

    Invited

     GE Whitney Symposium 10 / 12 / 2015
     Data assimilation and observation analysis for numerical weather prediction at NASA
     JCSDA Summer Colloquium 8 / 4 / 2015
     Presented lecture on "Adjoint Model Basics"

    Other

    AGU Fall Meeting 2015

    12 / 16 / 2016

    Investigating troposphere-stratosphere coupling during the southern hemisphere sudden stratospheric warming using an adjoint model.

    AMS Annual Meeting 2016

    1 / 14 / 2016

    Investigating Sensitivity to Saharan Dust in Atlantic Hurricane Formation Using the GEOS-5 Adjoint Model

     Goddard Young Scientist Forum 7 / 15 / 2015
     Investigating sensitivity to Saharan dust in tropical cyclone formation using the adjoint of GEOS-5
     Eurpoean Geosciences Union Annual Meeting 4 / 13 / 2015
    Talk on "Investigating sensitivity to Saharan dust in tropical cyclone formation using NASA’s adjoint model."
    Poster on "Comparison of the tangent linear properties of tracer transport schemes applied to geophysical problems."
     Workshop on Meteorological Sensitivity Analysis and Data Assimilation 1 / 6 / 2015
     Investigating sensitivity to dust in tropical cyclone formation using the GEOS-5 adjoint model

    Brief Bio

    Daniel Holdaway joined NASA's Global Modeling and Assimilation Office in February 2011. Since then he has worked in the atmospheric data assimilation group and specializes in the development of the tangent linear and adjoint versions of GEOS-5. He has developed the linearizations of the convection, cloud, radiation, aerosol and boundary layer schemes as well as implemented a new tracer advection linearization. The adjoint of GEOS-5 is one of the most capable in the World and is used for computing observations impacts, sensitivity to initial conditions and for 4DVAR data assimilation.

    Daniel collaborates with researchers within NASA and at other institutions on a range of sensitivity studies. He looks at the events that lead to sudden stratospheric warming, how dust interacts with forming tropical cyclones over Saharan Africa and how upper level winds affect the steering of Atlantic hurricanes.

    Publications

    Refereed

    Holdaway, D., and Y. Yang. 2016. "Study of the Effect of Temporal Sampling Frequency on DSCOVR Observations Using the GEOS-5 Nature Run Results (Part I): Earth’s Radiation Budget." Remote Sens. 8 (2): 98 [10.3390/rs8020098]

    Holdaway, D., and Y. Yang. 2016. "Study of the Effect of Temporal Sampling Frequency on DSCOVR Observations Using the GEOS-5 Nature Run Results (Part II): Cloud Coverage." Remote Sensing 8 (5): [10.3390/rs8050431]

    Holdaway, D. R., and J. Kent. 2015. "Assessing the tangent linear behaviour of common tracer transport schemes and their use in a linearised atmospheric general circulation model ." Tellus A 67 27895 [10.3402/tellusa.v67.27895]

    Holdaway, D., R. M. Errico, R. Gelaro, J. G. Kim, and R. B. Mahajan. 2015. "A Linearized Prognostic Cloud Scheme in NASA’s Goddard Earth Observing System Data Assimilation Tools." Monthly Weather Review 143 (10): 4198-4219 [10.1175/MWR-D-15-0037.1]

    Holdaway, D. R., and R. M. Errico. 2014. "Using Jacobian sensitivities to assess a linearization of the relaxed Arakawa-Schubert convection scheme." Q.J.R. Meteorol. Soc. 140 (681): 1319-1332 [10.1002/qj.2210]

    Holdaway, D. R., R. M. Errico, R. Gelaro, and J. G. Kim. 2014. "Inclusion of Linearized Moist Physics in NASA’s Goddard Earth Observing System Data Assimilation Tools." Mon. Weather Rev. 142 (1): 414-433 [10.1175/MWR-D-13-00193.1]

    Holdaway, D. R., J. Thuburn, and N. Wood. 2013. "Comparison of Lorenz and Charney–Phillips vertical discretisations for dynamics–boundary layer coupling. Part II: Transients." Quarterly Journal of the Royal Meteorological Society 139 (673): 1087–1098 [10.1002/qj.2017]

    Holdaway, D. R., J. Thuburn, and N. Wood. 2013. "Comparison of Lorenz and Charney–Phillips vertical discretisations for dynamics–boundary layer coupling. Part I: Steady states." Quarterly Journal of the Royal Meteorological Society 139 (673): 1073-1086 [10.1002/qj.2016]

    Holdaway, D. R., J. Thuburn, and N. Wood. 2007. "On the relation between order of accuracy, convergence rate and spectral slope for linear numerical methods applied to multiscale problems." International Journal for Numerical Methods in Fluids 56 (8): 1297-1303 [10.1002/fld.1644]

                                                                                                                                                                                            
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