Results 1 - 10 of 223

Global ensemble predictions of 2009’s tropical cyclones initialized with an ensemble Kalman filter

by Thomas M. Hamill, Jeffrey S. Whitaker, Michael Fiorino, Stanley G. Benjamin - WEATHER REV , 2011
"... Verification was performed on ensemble forecasts of 2009 Northern Hemisphere summer tropical cyclones (TCs) from two experimental global numerical weather prediction ensemble prediction systems (EPSs). The first model was a high-resolution version (T382L64) of the National Centers for Environmental ..."
Abstract - Cited by 30 (4 self) - Add to MetaCart
Verification was performed on ensemble forecasts of 2009 Northern Hemisphere summer tropical cyclones (TCs) from two experimental global numerical weather prediction ensemble prediction systems (EPSs). The first model was a high-resolution version (T382L64) of the National Centers for Environmental

2009: MOS Uncertainty Estimates in an Ensemble Framework

by Bob Glahn, Matthew Peroutka, Jerry Wiedenfeld, John Wagner, Greg Zylstra - Monthly Weather Review
"... It is being increasingly recognized that the uncertainty in weather forecasts should be quantified and furnished to users along with the single-value forecasts usually provided. Probabilistic forecasts of “events” have been made in special cases; for instance, probabilistic forecasts of the event de ..."
Abstract - Cited by 7 (0 self) - Add to MetaCart
defined as 0.01 in. or more of precipitation at a point over a specified time period [i.e., the probability of precipitation (PoP)] have been disseminated to the public by the Weather Bureau/National Weather Service since 1966. Within the past decade, ensembles of operational numerical weather prediction

improve performance of the Ensembl website

by Using Caching, Anne Parker, Eugene Bragin, Simon Brent, Bethan Pritchard, James A Smith, Stephen Trevanion
"... Background: The Ensembl web site has provided access to genomic information for almost 10 years. During this time the amount of data available through Ensembl has grown dramatically. At the same time, the World Wide Web itself has become a dramatically more important component of the scientific work ..."
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technologies to overcome any issues found. Solutions included optimization of the Apache web server, introduction of caching technologies and widespread implementation of AJAX code. These improvements were successfully deployed on the Ensembl website in late 2008 and early 2009. Conclusions: Web 2

Matrix averages relating to the Ginibre ensembles

by Peter J. Forrester, Eric M. Rains , 2009
"... The theory of zonal polynomials is used to compute the average of a Schur polynomial of argument AX, where A is a fixed matrix and X is from the real Ginibre ensemble. This generalizes a recent result of Sommers and Khorozhenko [J. Phys. A 42 (2009), 222002], and furthermore allows analogous results ..."
Abstract - Cited by 3 (3 self) - Add to MetaCart
The theory of zonal polynomials is used to compute the average of a Schur polynomial of argument AX, where A is a fixed matrix and X is from the real Ginibre ensemble. This generalizes a recent result of Sommers and Khorozhenko [J. Phys. A 42 (2009), 222002], and furthermore allows analogous

2009: Coupling ensemble Kalman filter with fourdimensional variational data assimilation

by Fuqing Zhang, Meng Zhang, James A. Hansen - Advances in Atmospheric Sciences , 2008
"... This study examines the performance of coupling the deterministic four-dimensional variational assimi-lation system (4DVAR) with an ensemble Kalman filter (EnKF) to produce a superior hybrid approach for data assimilation. The coupled assimilation scheme (E4DVAR) benefits from using the state-depend ..."
Abstract - Cited by 11 (1 self) - Add to MetaCart
This study examines the performance of coupling the deterministic four-dimensional variational assimi-lation system (4DVAR) with an ensemble Kalman filter (EnKF) to produce a superior hybrid approach for data assimilation. The coupled assimilation scheme (E4DVAR) benefits from using the state

2009: Simultaneous estimation of covariance inflation and observation errors within an ensemble Kalman filter

by Hong Li, Eugenia Kalnay, Takemasa Miyoshi - Quarterly Journal of the Royal Meteorological Society
"... Covariance inflation plays an important role within ensemble Kalman filter (EnKF) in preventing filter divergence and handling model errors. However the inflation factor needs to be tuned and tuning a parameter in EnKF is expensive. Wang and Bishop (2003), followed by Miyoshi (2005), adaptively esti ..."
Abstract - Cited by 38 (1 self) - Add to MetaCart
Covariance inflation plays an important role within ensemble Kalman filter (EnKF) in preventing filter divergence and handling model errors. However the inflation factor needs to be tuned and tuning a parameter in EnKF is expensive. Wang and Bishop (2003), followed by Miyoshi (2005), adaptively

2009: Outline of the Typhoon Ensemble Prediction System at the Japan Meteorological Agency

by Munehiko Yamaguchi, Takuya Komori - RSMC Tokyo-Typhoon Center Technical Review
"... The Japan Meteorological Agency (JMA) began operation of a new Ensemble Prediction System (EPS) known as the Typhoon EPS (TEPS) in February 2008. TEPS has been designed to improve track forecast targeting for tropical cyclones (TCs) in the Regional Specialized Meteorological Center (RSMC) Tokyo- Typ ..."
Abstract - Cited by 5 (2 self) - Add to MetaCart
The Japan Meteorological Agency (JMA) began operation of a new Ensemble Prediction System (EPS) known as the Typhoon EPS (TEPS) in February 2008. TEPS has been designed to improve track forecast targeting for tropical cyclones (TCs) in the Regional Specialized Meteorological Center (RSMC) Tokyo

© 2009 Biology Reports Ltd Describing protein conformational ensembles: beyond static

by George N Phillips , 2009
"... This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial License ..."
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This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial License

Director, Living Arts Playback Theatre Ensemble

by Nanjing Massacre
"... I stood gazing at the banks of Yangtze River in October 2009 watching an old, wrinkled Chinese man casting a line into the quickly moving muddy water. Clearly a witness to the time of the Nanjing Massacre, I fantasized that the old man might be fi shing for historical memory from the wide span of th ..."
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I stood gazing at the banks of Yangtze River in October 2009 watching an old, wrinkled Chinese man casting a line into the quickly moving muddy water. Clearly a witness to the time of the Nanjing Massacre, I fantasized that the old man might be fi shing for historical memory from the wide span

Computer Model Calibration Using the Ensemble Kalman Filter

by unknown authors
"... The ensemble Kalman filter (EnKF) (Evensen, 2009a) has proven effective in quantifying uncertainty in a number of challenging dynamic, state estimation, or data assimilation, problems such as weather forecasting and ocean modeling. In these problems a high-dimensional state parameter is successively ..."
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The ensemble Kalman filter (EnKF) (Evensen, 2009a) has proven effective in quantifying uncertainty in a number of challenging dynamic, state estimation, or data assimilation, problems such as weather forecasting and ocean modeling. In these problems a high-dimensional state parameter
Results 1 - 10 of 223