- Solar System Exploration Data Services Office (690.1)
- Space Geodesy Project Office (690.2)
- Astrochemistry Laboratory (691)
- Planetary Systems Laboratory (693)
- Laser Remote Sensing Laboratory (694)
- Planetary Magnetospheres Laboratory (695)
- Planetary Geology, Geophysics, and

Geochemistry Laboratory (698) (698) - Planetary Environments Laboratory (699)

- High Energy Astrophysics Science Archive Research Center Office (660.1)
- Office of Scientific Computing (660.2)
- Instrument Development Group (660.3)
- Astroparticle Physics (661)
- X-ray Astrophysics (662)
- Gravitational Astrophysics (663)
- Observational Cosmology (665)
- ExoPlanets and Stellar Astrophysics (667)

- Global Modeling and Assimilation Office (610.1)
- Global Change Data Center (610.2)
- Field Support Office (610.W)
- Goddard Institute for Space Studies (611)

- RESEARCH ASSOCIATE

- 301.614.6158

- Org Code: 610.1

- NASA/GSFC
- Mail Code: 610.1
- Greenbelt , MD 20771

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.

Daniel received his PhD in mathematics from the University of Exeter in the UK. Prior to that he undertook MSc and BSc degrees in Computational Science and Modelling and Mathematics respectively, both from Exeter.

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]

GE Whitney Symposium
10
/
12
/
2015

JCSDA Summer Colloquium
8
/
4
/
2015

AGU Fall Meeting 2015

12 / 16 / 2016Investigating troposphere-stratosphere coupling during the southern hemisphere sudden stratospheric warming using an adjoint model.

AMS Annual Meeting 2016

1 / 14 / 2016Investigating Sensitivity to Saharan Dust in Atlantic Hurricane Formation Using the GEOS-5 Adjoint Model

Goddard Young Scientist Forum
7
/
15
/
2015

Eurpoean Geosciences Union Annual Meeting
4
/
13
/
2015

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

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.

Daniel received his PhD in mathematics from the University of Exeter in the UK. Prior to that he undertook MSc and BSc degrees in Computational Science and Modelling and Mathematics respectively, both from Exeter.

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]