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RISMismatching Perturbations at the Lateral Boundaries in Limited-Area Ensemble Forecasting: A Case Study
Publisher: American Meteorological Society
Abstract: n experimental convection-permitting ensemble prediction system (EPS) has recently been developed at the Met Office where the analysis uncertainty is estimated by means of an ensemble transform Kalman filter (ETKF). In ...
An Examination of the Incremental Balance in a Global Ensemble-Based 3D-Var Data Assimilation System
Publisher: American Meteorological Society
Abstract: This study examines the modification to the balance properties of the analysis increments in a global three-dimensional variational data assimilation scheme when using flow-dependent background-error covariances derived ...
An Examination of Background Error Correlations between Mass and Rotational Wind over Precipitation Regions
Publisher: American Meteorological Society
Abstract: The differences in the balance characteristics between dry and precipitation areas in estimated short-term forecast error fields are investigated. The motivation is to see if dry and precipitation areas need to be treated ...
Scale-Dependent Background Error Covariance Localization: Evaluation in a Global Deterministic Weather Forecasting System
Publisher: American Meteorological Society
Abstract: AbstractScale-dependent localization (SDL) consists of applying the appropriate (i.e., different) amount of localization to different ranges of background error covariance spatial scales while simultaneously assimilating ...
The Characteristics of Key Analysis Errors. Part III: A Diagnosis of Their Evolution
Publisher: American Meteorological Society
Abstract: This paper presents a diagnostic study of the evolution of initial corrections obtained from the key analysis error algorithm that minimizes the short-range (24 h) forecast errors for four specific events poorly forecasted ...
The Characteristics of Key Analysis Errors. Part II: The Importance of the PV Corrections and the Impact of Balance
Publisher: American Meteorological Society
Abstract: This study examines a few approaches to isolate the balanced component of the initial corrections from the Canadian Meteorological Centre energy-norm-based key analysis error algorithm, in an attempt to capture the part ...
The Characteristics of Key Analysis Errors. Part I: Dynamical Balance and Comparison with Observations
Publisher: American Meteorological Society
Abstract: The characteristics of the initial corrections obtained from the Canadian Meteorological Centre (CMC) energy-norm-based key analysis error algorithm that minimizes short-range (24 h) forecast errors were investigated for ...
Improving Background Error Covariances in a 3D Ensemble–Variational Data Assimilation System for Regional NWP
Publisher: American Meteorological Society
Abstract: Following the recent development of a three-dimensional ensemble?variational (3DEnVar) data assimilation algorithm for the AROME-France NWP system, this paper examines different approaches to reduce the sampling noise in ...
Implementation of Deterministic Weather Forecasting Systems Based on Ensemble–Variational Data Assimilation at Environment Canada. Part II: The Regional System
Publisher: American Meteorological Society
Abstract: he modifications to the data assimilation component of the Regional Deterministic Prediction System (RDPS) implemented at Environment Canada operations during the fall of 2014 are described. The main change is the replacement ...
The Canadian Regional Data Assimilation and Forecasting System
Publisher: American Meteorological Society
Abstract: This paper describes the recent changes to the regional data assimilation and forecasting system at the Canadian Meteorological Center. A major aspect is the replacement of the currently operational global variable resolution ...