A Three-Parameter Model for Limited Area Forecasting
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Authors
Bengtsson, L.
Subjects
Atmosphere
Atmospheric Prediction
Numerical
Limited Area Forecasting
Atmospheric Circulation
Atmospheric Prediction
Numerical
Limited Area Forecasting
Atmospheric Circulation
Advisors
Date of Issue
1974-03
Date
Publisher
Language
Abstract
This report describes an operational quasi-geostrophic three-parameter model. The original model was developed by Dr. L. Bengtsson and has been used operationally for several years at the Swedish Meteorological and Hydrological Institute. The improved model described in this report incorporates an Ekman function and the effect of the flow over mountains as well as sensible and latent heat sources. Humidity and precipitation are also predicted by the model. An additional feature is the optional inclusion in the vorticity equation of the terms which are usually considered negligible: (1) the advection of vorticity by the divergent wind, (2) the product of relative vorticity and divergence, (3) the vertical advection of vorticity, and (4) the twisting term. The model can easily be adapted for different geographical areas with different grid lengths and also be integrated over different vertical layers. The lateral boundary values can be fixed or allowed to vary in time and thus it is possible to apply the so called nesting or telescoping technique. A special, relatively simple method to apply the nesting techniques is described.
Type
Report
Description
Series/Report No
Department
Organization
Environmental Prediction Research Facility
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
116 p.
Citation
Bengtsson, Lennart. A three-parameter model for limited area forecasting. NAVAL ENVIRONMENTAL PREDICTION RESEARCH FACILITY MONTEREY CA, 1974.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.