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RISA Generalization of Using an Adjoint Model in Intermittent Data Assimilation Systems
Publisher: American Meteorological Society
Abstract: A generalized setup is proposed for the poor man?s 4D variational data assimilation system (PMV) of Huang et al. The new scheme is referred to as a generalization of PMV (GPV) and has the same basic idea as that of PMV, ...
Variational Analysis Using Spatial Filters
Publisher: American Meteorological Society
Abstract: In this paper the standard variational analysis scheme is modified, through a simple transform, to avoid the inversion of the background error covariance matrix. A close inspection of the modified scheme reveals that it ...
Initialization of Cloud Water Content in a Data Assimilation System
Publisher: American Meteorological Society
Abstract: Cloud water content (CWC) is not treated in most operational objective analyses and initialization schemes. When CWC is used as a prognostic variable in a forecast model, it is necessary to define this variable at the ...
Initialization of Cloud Water Content and Cloud Cover for Numerical Prediction Models
Publisher: American Meteorological Society
Abstract: An initialization scheme for numerical models containing treatment of cloudiness is presented. The dynamic type of initialization scheme is based on the digital filtering technique, which requires integration of the model ...
Digital Filter Initialization for MM5
Publisher: American Meteorological Society
Abstract: In this paper several configurations of the fifth-generation Pennsylvania State University?National Center for Atmospheric Research (PSU?NCAR) Mesoscale Model (MM5), which is implemented at Beijing Institute of Urban ...
Initialization of the HIRLAM Model Using a Digital Filter
Publisher: American Meteorological Society
Abstract: Spurious high-frequency oscillations occur in forecasts made with the primitive equations if the initial fields of mass and wind are not in an appropriate state of balance with each other. These oscillations are due to ...
Diabatic Digital-Filtering Initialization: Application to the HIRLAM Model
Publisher: American Meteorological Society
Abstract: A digital-filtering initialization scheme, which includes the effects of diabatic processes, has been formulated. This scheme gives a lower noise level in the forecast and a better organized initial pressure-tendency field ...
A Comparison between Digital Filtering Initialization and Nonlinear Normal-Mode Initialization in a Data Assimilation System
Publisher: American Meteorological Society
Abstract: The objective of this study is to examine the performance of the adiabatic digital filtering initialization scheme of Lynch and Huang, the diabatic digital filtering initialization scheme of Huang and Lynch, and the diabatic ...
Development of the Upgraded Tangent Linear and Adjoint of the Weather Research and Forecasting (WRF) Model
Publisher: American Meteorological Society
Abstract: he authors propose a new technique for parallelizations of tangent linear and adjoint codes, which were applied in the redevelopment for the Weather Research and Forecasting (WRF) model with its Advanced Research WRF dynamic ...
Indirect Assimilation of Radar Reflectivity with WRF 3D-Var and Its Impact on Prediction of Four Summertime Convective Events
Publisher: American Meteorological Society
Abstract: n indirect radar reflectivity assimilation scheme has been developed within the Weather Research and Forecasting model three-dimensional data assimilation system (WRF 3D-Var). This scheme, instead of assimilating radar ...