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RISOptimization of the Assimilation of Radar Data at the Convective Scale Using Specific Background Error Covariances in Precipitation
Publisher: American Meteorological Society
Abstract: his study focuses on the impact of using specific background error covariances in precipitating areas in the Application of Research to Operations at Mesoscale (AROME-France) numerical weather prediction (NWP) system that ...
Mesoscale Assimilation of Radial Velocities from Doppler Radars in a Preoperational Framework
Publisher: American Meteorological Society
Abstract: This paper presents the results of a preoperational assimilation of radial velocities from Doppler radars of the French Application Radar la Météorologie InfraSynoptique (ARAMIS) network in the nonhydrostatic model, the ...
Three-Dimensional Variational Data Analysis to Retrieve Thermodynamical and Dynamical Fields from Various Nested Wind Measurements
Publisher: American Meteorological Society
Abstract: The present study is devoted to a new analysis of wind measurements from dropsonding and/or radiosonding of Doppler information from multiple Doppler radar scanning and of other wind measurements (sodar, dynamical sensors ...
Heterogeneous Convective-Scale Background Error Covariances with the Inclusion of Hydrometeor Variables
Publisher: American Meteorological Society
Abstract: onvective-scale models used in NWP nowadays include detailed realistic parameterization for the representation of cloud and precipitation processes. Yet they still lack advanced data assimilation schemes able to efficiently ...
Simulation of a Midlatitude Convective Storm Initialized with Bistatic Doppler Radar Data
Publisher: American Meteorological Society
Abstract: An analysis is developed to initialize a cloud-resolving model from an explicit structure of a precipitating convective system derived from multiple-Doppler radar observations. The different fields of the model prognostic ...
Short-Term Numerical Forecasting of a Shallow Storms Complex Using Bistatic and Single-Doppler Radar Data
Publisher: American Meteorological Society
Abstract: A new method based on four-dimensional variational radar data assimilation into a cloud-resolving model has been developed for nowcasting purposes. This method allows for the retrieval of the model prognostic variables ...
A Tropical Squall Line Observed during TOGA COARE: Extended Comparisons between Simulations and Doppler Radar Data and the Role of Midlevel Wind Shear
Publisher: American Meteorological Society
Abstract: Results from a three-dimensional cloud model are extensively compared with airborne Doppler radar data in the case of a tropical oceanic squall line observed during the Tropical Ocean Global Atmosphere Coupled Ocean?Atmosphere ...
Using Single-Doppler Data to Obtain a Mesoscale Environmental Field
Publisher: American Meteorological Society
Abstract: A 3D wind analysis based on single-Doppler data is proposed using mass conservation and assuming a linear horizontal wind field, which is constant in a moving reference frame. Data over an assimilation period that includes ...
Linear Filtering of Sample Covariances for Ensemble-Based Data Assimilation. Part I: Optimality Criteria and Application to Variance Filtering and Covariance Localization
Publisher: American Meteorological Society
Abstract: n data assimilation (DA) schemes for numerical weather prediction (NWP) systems, the estimation of forecast error covariances is a key point to get some flow dependency. As shown in previous studies, ensemble data assimilation ...
Linear Filtering of Sample Covariances for Ensemble-Based Data Assimilation. Part II: Application to a Convective-Scale NWP Model
Publisher: American Meteorological Society
Abstract: n Part I of this two-part study, a new theory for optimal linear filtering of covariances sampled from an ensemble of forecasts was detailed. This method, especially designed for data assimilation (DA) schemes in numerical ...