Publications

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2008

···> submitted

Recent Developments in Predictability and Dynamical Processes (PDP) Research: A Report by the THORPEX PDP Working Group
Istvan Szunyogh, Heini Wernli, Jan Barkmeijer, Craig H. Bishop, Edmund Chang, Patrick Harr, Sarah Jones, Thomas Jung, Naoko Kitabatake, Peter Knippertz, Shuhei Maeda, Sharanya Majumdar, Conny Schwierz, Olivier Talagrand, Frederic Vitart
Submitted to BAMS

···> in press

A Simulation Study Using a Local Ensemble Transform Kalman Filter for Data Assimilation in New York Harbor
R. N. Hoffman, R. M. Ponte, E. J. Kostelich, A. Blumberg, I. Szunyogh, S. V. Vinogradov, J. M. Henderson
Journal of Atmosphere and Ocean Technology

2007

···> submitted

Simultaneous estimation of covariance inflation and observation errors within ensemble Kalman filter
H. Li, E. Kalnay, and T. Miyoshi
Submitted to Quarterly Journal

Observation Bias Correction with an Ensemble Kalman Filter
E. J. Fertig, S.-J. Baek , B. R. Hunt , E. Ott, I. Szunyogh, J. A. Aravequia, E. Kalnay, H. Li, and J. Liu
Submited to Tellus

Comparison of ensemble-based and variational-based data assimilation schemes in a quasi-geostrophic model.
Yang, S-C, M. Corazza, A. Carrassi, E. Kalnay, and T. Miyoshi
Submitted to Mon. Wea. Rev.

Bred vectors and forecast errors in the NASA coupled general circulation model
Yang, S-C, E. Kalnay, M. Cai and M. Rienecker
Submitted to Mon. Wea. Rev., revised

···> in press

Using Singular Value Decomposition to Parameterize State-Dependent Model Errors
C. M. Danforth and E. Kalnay
JAS

Simple Doppler Wind Lidar adaptive observation experiments with 3D-Var and an ensemble Kalman filter in a global primitive equations model
J. Liu and E. Kalnay
GRL

···> Articles in refereed journals

A local ensemble transform Kalman filter data assimilation system for the NCEP global model
I. Szunyogh, E. J. Kostelich, G. Gyarmati, Eugenia Kalnay, B. R. Hunt, E. Ott, E. Satterfield, and J. A. Yorke
Tellus, 60A, 113-130

Assimilating Nonlocal Observations with a Local Ensemble Kalman Filter
E. Fertig, B. R. Hunt, E. Ott, and I. Szunyogh
Tellus, 59A, 719-739

4D-Var or Ensemble Kalman Filter?
Eugenia Kalnay, Hong Li, Takemasa Miyoshi, Shu-Chih Yang, and Joaquim Ballabrera-Poy
Tellus, 59A, 758-773

Discussion
Nils Gustafsson
Tellus, 59A,774-777
Response to the Discussion on ‘4D-Var or EnKF?’ by Nils Gustaffson
Tellus, 59A, 778-780

Efficient data assimilation for spatiotemporal chaos: a local ensemble transform Kalman filter
B. Hunt, E. Kostelich, I. Szunyogh
Physica D 230, pp. 112-126

Assessing Predictability with a Local Ensemble Kalman Filter
D. Kuhl, I. Szunyogh, E. J. Kostelich, D. J. Patil, G. Gyarmati, M. Oczkowski, B. R. Hunt, E. Kalnay, E. Ott, J. A. Yorke
Journal of the Atmospheric Sciences 64, 1116-1140

Estimating and Correcting Global Weather Model Error
C. M. Danforth, E. Kalnay, T. Miyoshi
Monthly Weather Review, 135, pp. 281-299, 2007

An implementation of the Local Ensemble Kalman Filter in a quasigeostrophic model and comparison with 3D-Var
M. Corazza, E. Kalnay, and S. C. Yang
Nonlin. Processes Geophys., 14, 89-101, 2007

A comparative Study of 4D-VAR and 4D Ensemble Kalman Filter: Perfect Model Simulations with Lorenz-96
E. Fertig, J. Harlim, and B. R. Hunt
Tellus, Vol. 59, pp. 96-101, 2007

···> Online Publications

Comparison between Local Ensemble Transform Kalman Filter and PSAS in the NASA finite volume GCM: perfect model experiments
Junjie Liu, Elana Judith Fertig, Hong Li, Eugenia Kalnay, Brian R. Hunt, Eric J. Kostelich, Istvan Szunyogh, Ricardo Todling
arXiv.org

···> Conference papers

The Local Ensemble Transform Kalman Filter and its implementation on the NCEP global model at the University of Maryland
I. Szunyogh, E. A. SatterďŹeld, J. A. AravĂŠquia, E. J. Fertig, G. Gyarmati, E. Kalnay, B. R. Hunt, E. J. Kostelich, D. D. Kuhl, E. Ott, and J. A. Yorke
ECMWF Workshop on Flow-dependent aspects of data assimilation

2006

···> Articles in refereed journals

Making Forecasts for Chaotic Physical Processes
C. M. Danforth, J. A. Yorke
Physical Review Letters, 96, 144102, 2006

Data assimilation as synchronization of truth and model: experiments with the 3-variable Lorenz system
Yang, S.-C., D. Baker, H. Li, M. Huff, G. Nagpal, E. Okereke, J. Villafane, E. Kalnay and G. Duane
J. Atmos. Sci. 63, pp. 2340-2354, 2006

ENSO Bred Vectors in Coupled Ocean–Atmosphere General Circulation Models
Yang, S.-C.,M. Cai, E. Kalnay, M. Rienecker, G. Yuan, and Z. Toth
J. of Climate, 2006

Local ensemble Kalman filtering in the presence of model bias
S.-J. Baek, B. R. Hunt, E. Kalnay, E. Ott and I. Szunyogh
Tellus, Vol. 58A, pp. 293-306, 2006

Extracting Envelopes of Non-Zonally Propagating Rossby Wave Packets
Aleksey V. Zimin, Istvan Szunyogh, Brian R. Hunt, and Edward Ott
Monthly Weather Review, 134, pp. 1329-1333, 2006

2005

···> Articles in refereed journals

Assessing a Local Ensemble Kalman Filter: Perfect Model Experiments with the NCEP Global Model
I. Szunyogh, E.J. Kostelich, G. Gyarmati, D.J. Patil, B.R. Hunt,E. Kalnay, E. Ott and J.A. Yorke
Tellus, Vol. 57A, pp. 528-545, 2005

Convex Error Growth Patterns in a Global Weather Model
J. Harlim, M. Oczkowski, J. A. Yorke, E. Kalnay, and B. Hunt
Physical Review Letters, 94, 228501, 2005

Mechanisms for the Development of Locally Low Dimensional Atmospheric Dynamics
M. Oczkowski, I. Szunyogh, and D.J. Patil
Journal of the Atmospheric Sciences, Vol. 62, pp.1135-1156, 2005

2004

···> Articles in refereed journals

A Local Ensemble Kalman Filter for Atmospheric Data Assimilation
E. Ott, B.R. Hunt, I. Szunyogh, A.V. Zimin, E.J. Kostelich, M. Kostelich, M. Corazza, T. Sauer, E. Kalnay, D.J. Patil, and J.A. Yorke
Tellus, Vol. 56A, pp. 415-428, 2004

Four-Dimensional Ensemble Kalman Filtering
B.R. Hunt, E. Kalnay, E.J. Kostelich, E. Ott, D.J. Patil, T. Sauer, I. Szunyogh, J.A. Yorke, and A.V. Zimin.
Tellus, Vol. 56A, pp. 273-277, 2004

Estimating the State of Large Spatio-Temporally Chaotic Systems
E. Ott, B.R. Hunt, I. Szunyogh, A.V. Zimin, E.J. Kostelich, M. Corazza, E. Kalnay, D.J. Patil, and J.A. Yorke
Physics Letters A, Vol. 330, pp. 365-370, 2004

Localized Error Bursts in Estimating the State of Spatiotemporal Chaos
S.-J. Baek, B.R. Hunt, I. Szunyogh, A.V. Zimin, and E. Ott
Chaos, Vol. 14, pp. 1042-1049, 2004

···> Conference papers

4D Ensemble Kalman Filtering for Assimilation of Asynchronous Observations
T. Sauer, J.A. Yorke, A.V. Zimin, E. Ott, E.J. Kostelich, I. Szunyogh, G. Gyarmati, E. Kalnay, D.J. Patil
84th AMS Annual Meeting 2004; Seattle, WA

A Local Ensemble Kalman Filter for the NCEP GFS Model
I. Szunyogh, E.J. Kostelich, G. Gyarmati, B.R. Hunt, E. Ott, A.V. Zimin, E. Kalnay, D.J. Patil, and J.A .Yorke.
84th AMS Annual Meeting 2004; Seattle, WA

The Local Ensemble Kalman Filter of the University of Maryland
E.J. Kostelich, G. Gyarmati, B.R. Hunt, E. Kalnay, E. Ott, D.J. Patil, and J.A. Yorke.
Workshop on Mesoscale and Microscale Meteorological Modeling for Military Applications Jackson State University, Jackson, Mississippi May 25-26 and AMS Symposium on the 50th Anniversary of Operational Numerical Weather Prediction" 14-17 June 2004, College Park, MD

2003

···> Articles in refereed journals

Local Predictability in a Simple Model of Atmospheric Balance
G. Gyarmati, I. Szunyogh, and D.J. Patil
Nonlinear Processes in Geophysics, Vol. 10, pp. 183-196, 2003.

Use of the Breeding Technique to Estimate the Structure of Analysis "Errors of the Day"
M. Corazza, E. Kalnay, D.J. Patil, S.-C. Yang, R. Morss, M. Cai, I. Szunyogh, B.R. Hunt, and J.A. Yorke
Nonlinear Processes in Geophysics, Vol. 10, pp. 233-243, 2003

Extracting Envelopes of Rossby Wave Packets
A.V. Zimin, I. Szunyogh, D.J. Patil, B.R. Hunt, and E. Ott
Monthly Weather Review, Vol. 131, pp. 847-853, 2003.

Using Observed Data for Testing the Statistical Consistency of Initial Ensemble Perturbations
I. Szunyogh, G. Gyarmati, and D. Devenyi
Idojaras [Quart.Jour. of the Hungarian Met. Service], Vol. 105, 2002

2002

···> Articles in refereed journals

Local Low Dimensionality and Relation to Effects of Targeted Weather Observations
D.J. Patil, I. Szunyogh, A. V. Zimin, B.R. Hunt, E. Kalnay, E. Ott, and J.A. Yorke
Seventh Experimental Chaos Conference, Aug 26-29 2002 San Diego, Ca., USA

On the Dynamical Basis of Targeting Weather Observations
I. Szunyogh, A.V. Zimin, D.J. Patil, B.R. Hunt, E. Kalnay, E. Ott, and J.A. Yorke
Proceedings on Symposium on Observations, Data Assimilation, and Probabilistic Prediction, Amer. Met. Soc. Jan. 13-17, 2002 Orlando Fl., USA

Propagation of the Effect of Targeted Observations: The 2000 Winter Storm Reconnaissance Program
I. Szunyogh, Z. Toth, A.V. Zimin, S.J. Majumdar, and A. Persson
Monthly Weather Review, Vol. 130, 2002

The Effect of Increased Horizontal Resolution on the NCEP Global Ensemble Mean Forecasts
I. Szunyogh and Z. Toth
Monthly Weather Review, Vol. 130, 2002

···> Conference Papers

Using Large Member Ensembles To Isolate Local Low Dimensionality of Atmospheric Dynamics
D.J. Patil, I. Szunyogh, B.R. Hunt, E. Kalnay, E. Ott, and J.A. Yorke
Proceedings on Symposium on Observations, Data Assimilation, and Probabilistic Prediction, Amer. Met. Soc. Jan. 13-17, 2002 Orlando Fl., USA

2001

···> Articles in refereed journals

Identifying Low-Dimensional Nonlinear Behavior in Atmospheric Data
D.J. Patil, B.R. Hunt, and J.A. Carton
Monthly Weather Review, Vol. 129, 2001

Local Low Dimensionality of Atmospheric Dynamics
D.J. Patil, B.R. Hunt, E. Kalnay, J.A. Yorke, and E. Ott
Physical Review Letters, Vol. 86 #26, 2001