Dr. Ricardo Todling works for the NASA Global Modeling and Assimilation Office (GMAO; former Data Assimilation Office, DAO). He started at NASA/DAO under a National Research Council fellowship in 1992, followed by a fellowship from the Universities Space Research Association in 1994, and subsequently joined Science Applications International Corporation as a contractor working for NASA's DAO and GMAO. In 2009, Dr. Todling was hired as a civil servant working for NASA/GMAO as Research Meteorologist.
Since 1996, Dr. Todling has been directly involved in developments associated with the DAO and GMAO data assimilation systems. He is one of the primary developers of the first NASA/DAO near-real-time data assimilation system built to support NASA's Earth Observing System program in the late 1990's and beyond. Since then, he has been in the role of Leading the data assimilation development in the Goddard Earth Observing System. This system provides data for NASA Instrument Teams to validate and calibrate their products as well as supports Modern-Era Retrospective analysis for Research and Applications efforts. Dr. Todling has served as liaison between GMAO and NOAA's National Centers for Environmental Prediction since the initial days of GMAO. He has directly contributed to the development of the Gridpoint Statistical Interpolation analysis system; this is the system supporting data assimilation efforts at GMAO, NCEP and their Joint Center for Satellite Data Assimilation partners. More recently, Dr. Todling has led the development and implementation of the GMAO Hybrid four-dimensional Ensemble-Variational Data Assimilation System. Dr. Todling has also been the lead developer of the GMAO adjoint-based tool for assessing observation impact to forecasts. More recently, Dr. Todling has been involved in testing components of JEDI, the future NASA/NOAA data assimilation system.
2009
-
Present
Research Meteorologist
National Aeronautics and Space Administration,
Goddard Space Flight Center
1996
-
2009
Senior Research Scientist
Science Applications International Corporation,
NASA/Goddard Space Flight Center
1994
-
1996
Visiting Research Scientist
Universities Research Association,
NASA/Goddard Space Flight Center
1992
-
1994
Post-Doctoral Reseacher
National Research Council, National Academy of Sciences,
NASA/Goddard Space Flight Center
Foundations of Atmospheric Data Assimilation. September 22-26, 1997: National Laboratory for Computational Sciences, Rio de Janeiro.
Estimation Theory and Atmospheric Data Assimilation. Winter 1997, semester course at University of Maryland's Meteorology Department.
Estimation Theory and Atmospheric Data Assimilation. January 22 to February 2, 1996, Institute for Pure and Applied Mathematics, Rio de Janeiro, Brazil.
Teaching Assistant, from March to December 1984, at the Mathematics Department at Pontificia Universidade Catolica, Rio de Janeiro, Brazil.
1992 Ph. D. Atmospheric Sciences, University of California Los Angeles, USA
1990 M. Sc. Atmospheric Sciences, University of California Los Angeles, USA
1986 M. Sc. Physics, Pontificia Universidade Catolica, Rio de Janeiro, Brasil
1983 B. Sc. Chemistry, Pontificia Universidade Catolica, Rio de Janeiro, Brasil
American Meteorological Society,
1992
-
Present
2014 - American Meteorological Society, Monthly Weather Review: For providing thorough, insightful, and high-quality reviews of manuscripts.
2013 - NASA Performance Award, Summary Rating of Distinguished for Performance Year 2012-2013.
2012 - NASA Performance Award, Summary Rating of Distinguished for Performance Year 2011-2012.
2011 - NASA Performance Award, In recognition and appreciation for a fully successful performance rating for 2009-2010.
2010 - Group Achievement, NASA, for delivery of the Modern Era Retrospective-analysis for Research and Applications (MERRA), a new meteorological analysis placing NASA's EOS data in a climate context.
2007 - Outstanding Performance, NASA/SAIC, for extraordinary accomplishment in the rapid development of a 4DVAR data assimilation system that includes advanced extensions of a weak-constraint formulation and built-in adjoint capability.
2005 - Outstanding Performance, NASA/SAIC, for outstanding work in integrating the GEOS-5 DAS to meet multiple high-priority GMAO objectives.
2004 - Group Achievement, NASA/SAIC, in recognition of the hard work, dedication, and outstanding teamwork in assembling components for the GEOS-5 DAS, and undertaking the initial tests on an accelerated cycle to transition to operations.
2003 - Group Achievement, NASA/SAIC, in recognition of the successful developments, evaluation and operational transition of an improved GEOS-4 analysis system in support of CERES and other GMAO customers. Group award.
2002 - Outstanding Performance, NASA/SAIC, for the many scientific contributions to several areas of critical development and cutting-edge research, including retrospective data assimilation, analysis error estimation, and forecast bias correction.
2002 - Group Achievement, NASA/SAIC, for outstanding work on developing the adjoint of the finite-volume GCM and providing invaluable support for adjoint-based scientific applications. Joint award with R. Giering and T. Kaminski.
2001 - Outstanding Performance, NASA/GSC, for work in developing an MPI version of the GEOS DAS, and for integrating various multi-disciplinary science development paths into the DAO's operational system. Joint award with L. L. Takacs.
2000 - Outstanding Performance, NASA/GSC, for scientific achievement in developing and implementing a moisture bias correction procedure in the NASA/GEOS Terra data assimilation system. Joint award with D. P. Dee.
1998 - Outstanding Performance, NASA/Goddard Space Flight Center, for system engineering and integration in the migration of GEOS data assimilation system to the Origin 2000 platforms.
1997 - Outstanding Performance, NASA/GSC, for leadership during the first migration of GEOS DAS to parallel computing architecture, as a crucial step toward the DAO's operational support of EOS AM1.
1994 - Outstanding Performance, NASA/Universities Space Research Association, for developing and testing advanced data assimilation schemes.
1991 - Outstanding Performance, Associated Students UCLA, in recognition of exceptional achievement as a student employee.
10/01/2009 -
09/30/2013
Exploring Model Error Formulations in the GEOS Weak-Constraint 4DVAR.,
NASA
PI
10/01/2010 -
09/30/2015
A Next--generation Integrated Earth System Analysis Coupling between the Ocean and Atmosphere.,
NASA
Co-I, turned PI.
10/01/2013 -
09/30/2016
Modeling, Analysis, and Prediction Program,
NASA , NASA NRA #: Modeling, Analysis, and Prediction Program
Error Covariance Diagnosis and Forecast Impact Estimation in NASA GEOS DAS.
;
Co-I
Refereed
Reichle, R. H., S. Q. Zhang, J. Kolassa, Q. Liu, and R. Todling. 2023. "A Weakly-Coupled Land Surface Analysis With SMAP Radiance Assimilation Improves GEOS Medium-Range Forecasts of Near-Surface Air Temperature and Humidity."
Quarterly Journal of the Royal Meteorological Society,
(In Press)
[10.1002/qj.4486]
Akkraoui, A. E., N. C. Privé, R. M. Errico, and R. Todling. 2023. "The GMAO Hybrid 4D-EnVar Observing System Simulation Experiment framework."
Monthly Weather Review,
(In Press)
[10.1175/mwr-d-22-0254.1]
Lee, E., R. Todling, B. M. Karpowicz, et al. 2022. "Assessment of Geo-Kompsat-2A Atmospheric Motion Vector Data and Its Assimilation Impact in the GEOS Atmospheric Data Assimilation System."
Remote Sensing,
14
(21):
5287
[10.3390/rs14215287]
Todling, R., N. Semane, R. Anthes, and S. Healy. 2022. "The relationship between two methods for estimating uncertainties in data assimilation."
Quarterly Journal of the Royal Meteorological Society,
148
(747):
2942-2954
[10.1002/qj.4343]
Zhu, Y., R. Todling, and N. Arnold. 2022. "Observation Impact and Information Retention in the Lower Troposphere of the GMAO GEOS Data Assimilation System."
Monthly Weather Review,
[10.1175/MWR-D-21-0334.1]
Reichle, R., S. Zhang, Q. Liu, et al. 2021. "Assimilation of SMAP Brightness Temperature Observations in the GEOS Land-Atmosphere Data Assimilation System."
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing,
14:
10628-10643
[10.1109/jstars.2021.3118595]
Privé, N. C., R. M. Errico, R. Todling, and A. El Akkraoui. 2020. "Evaluation of adjoint‐based observation impacts as a function of forecast length using an Observing System Simulation Experiment."
Quarterly Journal of the Royal Meteorological Society,
qj.3909
[10.1002/qj.3909]
Kim, M.-J., J. Jin, A. El Akkraoui, et al. 2020. "The Framework for Assimilating All-Sky GPM Microwave Imager Brightness Temperature Data in the NASA GEOS Data Assimilation System."
Monthly Weather Review,
148:
2433-2455
[10.1175/MWR-D-19-0100.1]
Diniz, F. L., R. Todling, and D. L. Herdies. 2020. "A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon Basin."
Earth and Space Science,
7
(3):
[10.1029/2019ea000779]
Diniz, F. L., and R. Todling. 2020. "Assessing the impact of observations in a multi-year reanalysis."
Quarterly Journal of the Royal Meteorological Society,
147
(727):
724-747
[10.1002/qj.3705]
Takacs, L. L., M. J. Suarez, and R. Todling. 2018. "The Stability of Incremental Analysis Update."
Monthly Weather Review,
146
(10):
3259-3275
[10.1175/MWR-D-18-0117.1]
Gelaro, R., W. McCarty, M. J. Suárez, et al. 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]
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]
Takacs, L. L., M. J. Suarez, and R. Todling. 2016. "Maintaining atmospheric mass and water balance in reanalyses."
Quarterly Journal of the Royal Meteorological Society,
142:
1565-1573
[10.1002/qj.2763]
Brassington, G., M. Martin, H. Tolman, et al. 2015. "Progress and challenges in short- to medium-range coupled prediction."
Journal of Operational Oceanography,
8
(sup2):
s239-s258
[10.1080/1755876x.2015.1049875]
Todling, R. 2015. "A lag-1 smoother approach to system-error estimation: sequential method."
Q.J.R. Meteorol. Soc.,
141
(690):
1502-1513
[10.1002/qj.2460]
Todling, R. 2015. "A complementary note to ‘A lag-1 smoother approach to system-error estimation’: the intrinsic limitations of residual diagnostics."
Q.J.R. Meteorol. Soc.,
141
(692):
2917-2922
[10.1002/qj.2546]
Todling, R. 2013. "Comparing Two Approaches for Assessing Observation Impact."
Mon. Weather Rev.,
141
(5):
1484-1505
[10.1175/MWR-D-12-00100.1]
El Akkraoui, A., Y. Tremolet, and R. Todling. 2013. "Preconditioning of variational data assimilation and the use of a bi-conjugate gradient method."
Q.J.R. Meteorol. Soc.,
139
(672):
731-741
[10.1002/qj.1997]
Errico, R. M., R. Yang, N. C. Prive, et al. 2013. "Development and validation of observing-system simulation experiments at NASA's Global Modeling and Assimilation Office."
Q.J.R. Meteorol. Soc.,
139
(674):
1162-1178
[10.1002/qj.2027]
Rienecker, M. M., M. J. Suarez, R. Gelaro, et al. 2011. "MERRA: NASA’s Modern-Era Retrospective Analysis for Research and Applications."
J. Climate,
24
(14):
3624-3648
[10.1175/JCLI-D-11-00015.1]
Daescu, D. N., and R. Todling. 2010. "Adjoint sensitivity of the model forecast to data assimilation system error covariance parameters."
Quarterly Journal of the Royal Meteorological Society,
136
(653):
2000-2012
[10.1002/qj.693]
Gelaro, R., R. H. Langland, S. Pellerin, and R. Todling. 2010. "The THORPEX Observation Impact Intercomparison Experiment."
Mon. Wea. Rev.,
138
(11):
4009-4025
[10.1175/2010MWR3393.1]
Daescu, D. N., and R. Todling. 2009. "Adjoint Estimation of the Variation in Model Functional Output due to the Assimilation of Data."
Mon. Weather Rev.,
137
(5):
1705-1716
[10.1175/2008MWR2659.1]
Errico, R. M., R. Gelaro, E. Novakovskaia, and R. Todling. 2007. "General characteristics of stratospheric singular vectors."
Meteorol. Z.,
16
(6):
621-634
[10.1127/0941-2948/2007/0245]
Stajner, I., C. Benson, H.-C. Liu, et al. 2007. "Ice polar stratospheric clouds detected from assimilation of Atmospheric Infrared Sounder data."
Geophys. Res. Lett,
34
(16):
L16802
[10.1029/2007GL029415]
Bosilovich, M. G., J. Radakovich, A. M. Da Silva, R. Todling, and F. Verter. 2007. "Skin Temperature Analysis and Bias Correction in a Coupled Land-Atmosphere Data Assimilation System."
Journal of the Meteorological Society of Japan,
85A:
Le Marshall, J., J. Jung, J. Derber, et al. 2005. "Impact of atmospheric infrared sounder observations on weather forecasts."
Eos, Transactions American Geophysical Union,
86
(11):
109-116
[10.1029/2005EO110002]
LeMarshall, J., J. Jung, J. Derber, et al. 2005. "AIRS hyperspectral data improves southern hemisphere forecasts."
Austral Met Mag,
54:
57-60.
LeMarshall, J., J. Jung, J. Derber, et al. 2005. "Impact of atmospheric infrared sounder observations on weather forecasts."
Eos,
86:
109-116.
Zhu, Y., R. Todling, J. Guo, et al. 2003. "The GEOS-3 Retrospective Data Assimilation System: The 6-Hour Lag Case."
Mon. Weather Rev.,
131
(9):
2129-2150
[10.1175/1520-0493(2003)131<2129:TGRDAS>2.0.CO;2]
Dee, D. P., L. Rukhovets, R. Todling, A. M. da Silva, and J. W. Larson. 2001. "An adaptive buddy check for observational quality control."
Quarterly Journal of the Royal Meteorological Society,
127
(577):
2451-2471
[10.1002/qj.49712757714]
Dee, P. D., and R. Todling. 2000. "Data Assimilation in the Presence of Forecast Bias: The GEOS Moisture Analysis."
Monthly Weather Review,
128
(9):
3268-3282
[http://dx.doi.org/10.1175/1520-0493(2000)128<3268:]
Tippett, M. K., S. E. Cohn, R. Todling, and D. Marchesin. 2000. "Low-dimensional representation of error covariance."
Tellus,
52A
(5):
533-553.
Tippett, M. K., S. E. Cohn, R. Todling, and D. Marchesin. 2000. "Conditioning of the Stable, Discrete-Time Lyapunov Operator."
SIAM. J. Matrix Anal. & Appl.,
22
(1):
56-65
[10.1137/S0895479899354822]
Todling, R., S. E. Cohn, and N. S. Sivakumaran. 1998. "Suboptimal Schemes for Retrospective Data Assimilation Based on the Fixed-Lag Kalman Smoother."
Monthly Weather Review,
126
(8):
2274-2286
[http://dx.doi.org/10.1175/1520-0493(1998)126<2274:]
Ghil, M., and R. Todling. 1996. "Tracking Atmospheric Instabilities with the Kalman Filter. Part II: Two-Layer Results."
Monthly Weather Review,
124
(10):
2340-2352
[http://dx.doi.org/10.1175/1520-0493(1996)124<2340:]
Cohn, S. E., and R. Todling. 1996. "Approximate data assimilation schemes for stable and unstable dynamics."
JOURNAL-METEOROLOGICAL SOCIETY OF JAPAN SERIES 2,
74:
63--75.
Todling, R., and S. E. Cohn. 1994. "Suboptimal Schemes for Atmospheric Data Assimilation Based on the Kalman Filter."
Monthly Weather Review,
122
(11):
2530-2557
[http://dx.doi.org/10.1175/1520-0493(1994)122<2530:]
Cohn, S. E., N. S. Sivakumaran, and R. Todling. 1994. "A fixed-lag Kalman smoother for retrospective data assimilation."
Monthly Weather Review,
122
(12):
2838-2867
[http://dx.doi.org/10.1175/1520-0493(1994)122<2838:]
Todling, R., and M. Ghil. 1994. "Tracking Atmospheric Instabilities with the Kalman Filter. Part 1: Methodology and One-Layer Resultst."
Monthly Weather Review,
122
(1):
183-204
[http://dx.doi.org/10.1175/1520-0493(1994)122<0183:]
Non-Refereed
Todling, R., and A. El Akkraoui. 2018. "The GMAO Hybrid Ensemble-Variational Atmospheric Data Assimilation System: Version 2.0."
NASA/TM-2018-104606
50:
184pp
[Full Text (Link)]
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 System."
NASA Technical Report Series on Global Modeling and Data Assimilation, NASA/TM-2018-104606
49:
44pp
[Full Text (Link)]
Errico, R. M., N. C. Prive, D. Carvalho, et al. 2017. "Description of the GMAO OSSE for Weather Analysis Software Package: Version 3."
NASA Technical Report Series on Global Modeling and Data Assimilation, NASA/TM-2017-104606
48:
156 pp.
[Full Text (Link)]
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.
Takacs, L. L., M. J. Suarez, and R. Todling. 2015. "Maintaining Atmospheric Mass and Water Balance Within Reanalysis."
Technical Report Series on Global Modeling and Data Assimilation (NASA TM-–2014-104606)
37:
39pp
[Full Text (Link)]
Yang, W., I. M. Navon, and R. Todling. 1997. "Documentation of the Tangent Linear and Adjoint Models of the Relaxed Arakawa-Schubert Moisture Parameterization Package of the NASA GEOS-1 GCM (Version 5.2)."
NASA/Tech. Memo. 104606
11:
40
[https://gmao.gsfc.nasa.gov/pubs/docs/Yang131.pdf]
Refereed
Reichle, R. H., S. Q. Zhang, J. Kolassa, Q. Liu, and R. Todling. 2023. "A Weakly-Coupled Land Surface Analysis With SMAP Radiance Assimilation Improves GEOS Medium-Range Forecasts of Near-Surface Air Temperature and Humidity."
Quarterly Journal of the Royal Meteorological Society
(In Press)
[10.1002/qj.4486]
Akkraoui, A. E., N. C. Privé, R. M. Errico, and R. Todling. 2023. "The GMAO Hybrid 4D-EnVar Observing System Simulation Experiment framework."
Monthly Weather Review
(In Press)
[10.1175/mwr-d-22-0254.1]
Lee, E., R. Todling, B. M. Karpowicz, et al. 2022. "Assessment of Geo-Kompsat-2A Atmospheric Motion Vector Data and Its Assimilation Impact in the GEOS Atmospheric Data Assimilation System."
Remote Sensing
14
(21):
5287
[10.3390/rs14215287]
Todling, R., N. Semane, R. Anthes, and S. Healy. 2022. "The relationship between two methods for estimating uncertainties in data assimilation."
Quarterly Journal of the Royal Meteorological Society
148
(747):
2942-2954
[10.1002/qj.4343]
Zhu, Y., R. Todling, and N. Arnold. 2022. "Observation Impact and Information Retention in the Lower Troposphere of the GMAO GEOS Data Assimilation System."
Monthly Weather Review
[10.1175/MWR-D-21-0334.1]
Reichle, R., S. Zhang, Q. Liu, et al. 2021. "Assimilation of SMAP Brightness Temperature Observations in the GEOS Land-Atmosphere Data Assimilation System."
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
14
10628-10643
[10.1109/jstars.2021.3118595]
Privé, N. C., R. M. Errico, R. Todling, and A. El Akkraoui. 2020. "Evaluation of adjoint‐based observation impacts as a function of forecast length using an Observing System Simulation Experiment."
Quarterly Journal of the Royal Meteorological Society
qj.3909
[10.1002/qj.3909]
Kim, M.-J., J. Jin, A. El Akkraoui, et al. 2020. "The Framework for Assimilating All-Sky GPM Microwave Imager Brightness Temperature Data in the NASA GEOS Data Assimilation System."
Monthly Weather Review
148
2433-2455
[10.1175/MWR-D-19-0100.1]
Diniz, F. L., R. Todling, and D. L. Herdies. 2020. "A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon Basin."
Earth and Space Science
7
(3):
[10.1029/2019ea000779]
Diniz, F. L., and R. Todling. 2020. "Assessing the impact of observations in a multi-year reanalysis."
Quarterly Journal of the Royal Meteorological Society
147
(727):
724-747
[10.1002/qj.3705]
Takacs, L. L., M. J. Suarez, and R. Todling. 2018. "The Stability of Incremental Analysis Update."
Monthly Weather Review
146
(10):
3259-3275
[10.1175/MWR-D-18-0117.1]
Gelaro, R., W. McCarty, M. J. Suárez, et al. 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]
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]
Takacs, L. L., M. J. Suarez, and R. Todling. 2016. "Maintaining atmospheric mass and water balance in reanalyses."
Quarterly Journal of the Royal Meteorological Society
142
1565-1573
[10.1002/qj.2763]
Brassington, G., M. Martin, H. Tolman, et al. 2015. "Progress and challenges in short- to medium-range coupled prediction."
Journal of Operational Oceanography
8
(sup2):
s239-s258
[10.1080/1755876x.2015.1049875]
Todling, R. 2015. "A lag-1 smoother approach to system-error estimation: sequential method."
Q.J.R. Meteorol. Soc.
141
(690):
1502-1513
[10.1002/qj.2460]
Todling, R. 2015. "A complementary note to ‘A lag-1 smoother approach to system-error estimation’: the intrinsic limitations of residual diagnostics."
Q.J.R. Meteorol. Soc.
141
(692):
2917-2922
[10.1002/qj.2546]
Todling, R. 2013. "Comparing Two Approaches for Assessing Observation Impact."
Mon. Weather Rev.
141
(5):
1484-1505
[10.1175/MWR-D-12-00100.1]
El Akkraoui, A., Y. Tremolet, and R. Todling. 2013. "Preconditioning of variational data assimilation and the use of a bi-conjugate gradient method."
Q.J.R. Meteorol. Soc.
139
(672):
731-741
[10.1002/qj.1997]
Errico, R. M., R. Yang, N. C. Prive, et al. 2013. "Development and validation of observing-system simulation experiments at NASA's Global Modeling and Assimilation Office."
Q.J.R. Meteorol. Soc.
139
(674):
1162-1178
[10.1002/qj.2027]
Rienecker, M. M., M. J. Suarez, R. Gelaro, et al. 2011. "MERRA: NASA’s Modern-Era Retrospective Analysis for Research and Applications."
J. Climate
24
(14):
3624-3648
[10.1175/JCLI-D-11-00015.1]
Daescu, D. N., and R. Todling. 2010. "Adjoint sensitivity of the model forecast to data assimilation system error covariance parameters."
Quarterly Journal of the Royal Meteorological Society
136
(653):
2000-2012
[10.1002/qj.693]
Gelaro, R., R. H. Langland, S. Pellerin, and R. Todling. 2010. "The THORPEX Observation Impact Intercomparison Experiment."
Mon. Wea. Rev.
138
(11):
4009-4025
[10.1175/2010MWR3393.1]
Daescu, D. N., and R. Todling. 2009. "Adjoint Estimation of the Variation in Model Functional Output due to the Assimilation of Data."
Mon. Weather Rev.
137
(5):
1705-1716
[10.1175/2008MWR2659.1]
Errico, R. M., R. Gelaro, E. Novakovskaia, and R. Todling. 2007. "General characteristics of stratospheric singular vectors."
Meteorol. Z.
16
(6):
621-634
[10.1127/0941-2948/2007/0245]
Stajner, I., C. Benson, H.-C. Liu, et al. 2007. "Ice polar stratospheric clouds detected from assimilation of Atmospheric Infrared Sounder data."
Geophys. Res. Lett
34
(16):
L16802
[10.1029/2007GL029415]
Bosilovich, M. G., J. Radakovich, A. M. Da Silva, R. Todling, and F. Verter. 2007. "Skin Temperature Analysis and Bias Correction in a Coupled Land-Atmosphere Data Assimilation System."
Journal of the Meteorological Society of Japan
85A
Le Marshall, J., J. Jung, J. Derber, et al. 2005. "Impact of atmospheric infrared sounder observations on weather forecasts."
Eos, Transactions American Geophysical Union
86
(11):
109-116
[10.1029/2005EO110002]
LeMarshall, J., J. Jung, J. Derber, et al. 2005. "AIRS hyperspectral data improves southern hemisphere forecasts."
Austral Met Mag
54
57-60
LeMarshall, J., J. Jung, J. Derber, et al. 2005. "Impact of atmospheric infrared sounder observations on weather forecasts."
Eos
86
109-116
Zhu, Y., R. Todling, J. Guo, et al. 2003. "The GEOS-3 Retrospective Data Assimilation System: The 6-Hour Lag Case."
Mon. Weather Rev.
131
(9):
2129-2150
[10.1175/1520-0493(2003)131<2129:TGRDAS>2.0.CO;2]
Dee, D. P., L. Rukhovets, R. Todling, A. M. da Silva, and J. W. Larson. 2001. "An adaptive buddy check for observational quality control."
Quarterly Journal of the Royal Meteorological Society
127
(577):
2451-2471
[10.1002/qj.49712757714]
Dee, P. D., and R. Todling. 2000. "Data Assimilation in the Presence of Forecast Bias: The GEOS Moisture Analysis."
Monthly Weather Review
128
(9):
3268-3282
[http://dx.doi.org/10.1175/1520-0493(2000)128<3268:]
Tippett, M. K., S. E. Cohn, R. Todling, and D. Marchesin. 2000. "Low-dimensional representation of error covariance."
Tellus
52A
(5):
533-553
Tippett, M. K., S. E. Cohn, R. Todling, and D. Marchesin. 2000. "Conditioning of the Stable, Discrete-Time Lyapunov Operator."
SIAM. J. Matrix Anal. & Appl.
22
(1):
56-65
[10.1137/S0895479899354822]
Todling, R., S. E. Cohn, and N. S. Sivakumaran. 1998. "Suboptimal Schemes for Retrospective Data Assimilation Based on the Fixed-Lag Kalman Smoother."
Monthly Weather Review
126
(8):
2274-2286
[http://dx.doi.org/10.1175/1520-0493(1998)126<2274:]
Ghil, M., and R. Todling. 1996. "Tracking Atmospheric Instabilities with the Kalman Filter. Part II: Two-Layer Results."
Monthly Weather Review
124
(10):
2340-2352
[http://dx.doi.org/10.1175/1520-0493(1996)124<2340:]
Cohn, S. E., and R. Todling. 1996. "Approximate data assimilation schemes for stable and unstable dynamics."
JOURNAL-METEOROLOGICAL SOCIETY OF JAPAN SERIES 2
74
63--75
Todling, R., and S. E. Cohn. 1994. "Suboptimal Schemes for Atmospheric Data Assimilation Based on the Kalman Filter."
Monthly Weather Review
122
(11):
2530-2557
[http://dx.doi.org/10.1175/1520-0493(1994)122<2530:]
Cohn, S. E., N. S. Sivakumaran, and R. Todling. 1994. "A fixed-lag Kalman smoother for retrospective data assimilation."
Monthly Weather Review
122
(12):
2838-2867
[http://dx.doi.org/10.1175/1520-0493(1994)122<2838:]
Todling, R., and M. Ghil. 1994. "Tracking Atmospheric Instabilities with the Kalman Filter. Part 1: Methodology and One-Layer Resultst."
Monthly Weather Review
122
(1):
183-204
[http://dx.doi.org/10.1175/1520-0493(1994)122<0183:]
Non-Refereed
Todling, R., and A. El Akkraoui. 2018. "The GMAO Hybrid Ensemble-Variational Atmospheric Data Assimilation System: Version 2.0."
NASA/TM-2018-104606
50
184pp
[Full Text (Link)]
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 System."
NASA Technical Report Series on Global Modeling and Data Assimilation, NASA/TM-2018-104606
49
44pp
[Full Text (Link)]
Errico, R. M., N. C. Prive, D. Carvalho, et al. 2017. "Description of the GMAO OSSE for Weather Analysis Software Package: Version 3."
NASA Technical Report Series on Global Modeling and Data Assimilation, NASA/TM-2017-104606
48
156 pp.
[Full Text (Link)]
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
Takacs, L. L., M. J. Suarez, and R. Todling. 2015. "Maintaining Atmospheric Mass and Water Balance Within Reanalysis."
Technical Report Series on Global Modeling and Data Assimilation (NASA TM-–2014-104606)
37
39pp
[Full Text (Link)]
Yang, W., I. M. Navon, and R. Todling. 1997. "Documentation of the Tangent Linear and Adjoint Models of the Relaxed Arakawa-Schubert Moisture Parameterization Package of the NASA GEOS-1 GCM (Version 5.2)."
NASA/Tech. Memo. 104606
11
40
[https://gmao.gsfc.nasa.gov/pubs/docs/Yang131.pdf]
