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RISA Simple Parameterization Scheme of Evapotranspiration over Land for the NMC Medium-Range Forecast Model
Publisher: American Meteorological Society
Abstract: The use of a simple bucket method to parameterize the evapotranspiration over land has been found to overestimate the latent heat flux in the global spectral model at the National Meteorological Center. A new parameterization ...
Sensitivity of Hurricane Intensity Forecast to Convective Momentum Transport Parameterization
Publisher: American Meteorological Society
Abstract: A parameterization of the convection-induced pressure gradient force (PGF) in convective momentum transport (CMT) is tested for hurricane intensity forecasting using NCEP's operational Global Forecast System (GFS) and its ...
Revision of Convection and Vertical Diffusion Schemes in the NCEP Global Forecast System
Publisher: American Meteorological Society
Abstract: new physics package containing revised convection and planetary boundary layer (PBL) schemes in the National Centers for Environmental Prediction?s Global Forecast System is described. The shallow convection (SC) scheme ...
Convective Trigger Function for a Mass-Flux Cumulus Parameterization Scheme
Publisher: American Meteorological Society
Abstract: A precipitation physics package for the National Centers for Environmental Prediction Regional Spectral Model designed to improve the skill of precipitation forecasts is proposed. The package incorporates a prognostic ...
Nonlocal Boundary Layer Vertical Diffusion in a Medium-Range Forecast Model
Publisher: American Meteorological Society
Abstract: In this paper, the incorporation of a simple atmospheric boundary layer diffusion scheme into the NCEP Medium-Range Forecast Model is described. A boundary layer diffusion package based on the Troen and Mahrt nonlocal ...
Improvement of the NCEP Global Model over the Tropics: An Evaluation of Model Performance during the 1995 Hurricane Season
Publisher: American Meteorological Society
Abstract: An evaluation of the performance of the National Centers for Environmental Prediction Medium-Range Forecast Model was made for the large-scale tropical forecasts and hurricane track forecasts during the 1995 hurricane ...
Downstream Amplification and Formation of Monsoon Disturbances
Publisher: American Meteorological Society
Abstract: In this paper we present many examples (based on 43 years of data) of a phenomenon of downstream amplification over the monsoonal belt. The specific finding here is the following sequence of events: 1) During northern ...
On Simultaneous Surges in the Trades
Publisher: American Meteorological Society
Abstract: In this note we present an interesting phenomenon involving the near-simultaneous intensification and weakening of the trades. The major data source for this study are low-cloud motion vectors obtained from the geosynchronous ...
Numerical Simulation of the Somali Jet
Publisher: American Meteorological Society
Abstract: In this study we show that many of the observed features of the cross-equatorial low-level jet of the Arabian Sea, Indian Ocean and Somalia can be numerically simulated by including 1) the cast African and Madagascar ...
Comparison of NCEP-NCAR Reanalysis with 1987 FIFE Data
Publisher: American Meteorological Society
Abstract: Data from the FIFE experiment of the summer of 1987 are used to assess the diurnal and seasonal cycles of the surface energy budget and boundary layer in the NCEP-NCAR reanalysis, which used the summer 1995 version of the ...