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RISHurricane Predictability Analysis with Singular Vectors in the Multiresolution Global Shallow Water Model
Publisher: American Meteorological Society
An OSSE-Based Evaluation of Hybrid Variational–Ensemble Data Assimilation for the NCEP GFS. Part I: System Description and 3D-Hybrid Results
Publisher: American Meteorological Society
Abstract: n observing system simulation experiment (OSSE) has been carried out to evaluate the impact of a hybrid ensemble?variational data assimilation algorithm for use with the National Centers for Environmental Prediction (NCEP) ...
An OSSE-Based Evaluation of Hybrid Variational–Ensemble Data Assimilation for the NCEP GFS. Part II: 4DEnVar and Hybrid Variants
Publisher: American Meteorological Society
Abstract: his work describes the formulation of a hybrid four-dimensional ensemble--variational (4DEnVar) algorithm and initialization options utilized within the National Centers for Environmental Prediction global data assimilation ...
Multiple Regimes in Northern Hemisphere Height Fields via MixtureModel Clustering
Publisher: American Meteorological Society
Abstract: A mixture model is a flexible probability density estimation technique, consisting of a linear combination of k component densities. Such a model is applied to estimate clustering in Northern Hemisphere (NH) 700-mb ...
A Three-Dimensional Variational Data Assimilation Scheme for the Regional Ocean Modeling System
Publisher: American Meteorological Society
Abstract: A three-dimensional variational data assimilation (3DVAR) scheme has been developed within the framework of the Regional Ocean Modeling System (ROMS). This ROMS3DVAR enables the capability of predicting meso- to small-scale ...
Low-Frequency Variability in Shallow-Water Models of the Wind-Driven Ocean Circulation. Part I: Steady-State Solution
Publisher: American Meteorological Society
Abstract: Successive bifurcations?from steady states through periodic to aperiodic solutions?are studied in a shallow-water, reduced-gravity, 2½-layer model of the midlatitude ocean circulation subject to time-independent wind stress. ...
Low-Frequency Variability in Shallow-Water Models of the Wind-Driven Ocean Circulation. Part II: Time-Dependent Solutions
Publisher: American Meteorological Society
Abstract: The time-dependent wind-driven ocean circulation is investigated for both a rectangular and a North Atlantic?shaped basin. Multiple steady states in a 2½-layer shallow-water model and their dependence on various parameters ...
Isentropic Transport within the Antarctic Polar-Night Vortex: Rossby Wave Breaking Evidence and Lagrangian Structures
Publisher: American Meteorological Society
Abstract: he trajectories in the lower stratosphere of isopycnic balloons released from Antarctica by Vorcore and Concordiasi field campaigns during the southern springs of 2005 and 2010 showed events of latitudinal transport inside ...
Balance and Ensemble Kalman Filter Localization Techniques
Publisher: American Meteorological Society
Abstract: In ensemble Kalman filter (EnKF) data assimilation, localization modifies the error covariance matrices to suppress the influence of distant observations, removing spurious long-distance correlations. In addition to allowing ...
Routes of Transport across the Antarctic Polar Vortex in the Southern Spring
Publisher: American Meteorological Society
Abstract: ransport in the lower stratosphere over Antarctica has been studied in the past by means of several approaches, such as contour dynamics or Lyapunov exponents. This paper examines the problem by means of a new Lagrangian ...