Diagnostics For And Evaluations Of New Physical Parameterization Schemes For Global Nwp Models
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Diagnostics For And Evaluations Of New Physical Parameterization Schemes For Global Nwp Models
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Author : Chien-Hsiung Yang
language : en
Publisher:
Release Date : 1990
Diagnostics For And Evaluations Of New Physical Parameterization Schemes For Global Nwp Models written by Chien-Hsiung Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Atmospheric models categories.
The procedures and results of a study undertaken to evaluate and assess the impacts of three new parameterization schemes for the GL global spectral model as a 3-4 day range forecast model are described. The tree parameterization schemes are one each for the boundary-layer physics, moist convection and heating due to solar and terrestrial radiations. These schemes are incorporated either singly or jointly into a rhomboidal-30, 12-layer global spectral model for four-day simulations using FGGE III- a data as input. Evaluation and assessment are made on the basis of two kinds of global statistics: mean and root-mean-square errors, and on their magnitudes and distributions. The statistics are generated for both the primary, that is, prognostic, variables, and supplementary variables such as zonal-mean and zonal-eddies energy densities. The new moist convection scheme has been found to increase convective activity significantly and maintain it throughout the four-day period. It also warms and dries the middle troposphere, but produces rainfall far in excess of the climatology. The radiation parameterization has been found to cool the atmosphere and reduce its specific humidity. It counterbalances enhanced heating and moistening brought about by the new boundary-layer and moist convection schemes and eliminates the systematic warming of the old model.
Diagnostics For And Evaluations Of New Physical Parameterization Schemes For Global Nwp Models
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Author :
language : en
Publisher:
Release Date : 1990
Diagnostics For And Evaluations Of New Physical Parameterization Schemes For Global Nwp Models written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Atmospheric physics categories.
Environmental Research Papers
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Author :
language : en
Publisher:
Release Date :
Environmental Research Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Environmental geology categories.
Development Of A Cloud Forecast Scheme For The Gl Baseline Global Spectral Model
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Author : Kenneth E. Mitchell
language : en
Publisher:
Release Date : 1989
Development Of A Cloud Forecast Scheme For The Gl Baseline Global Spectral Model written by Kenneth E. Mitchell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Cloud forecasting categories.
Using forecast relative humidity (RH) from a global model, several pre-existing diagnostic RH-to-cloud schemes were tested to forecast global fractional cloud cover in a postprocessor format. Since none of the schemes tested provided a superior cloud forecast when compared to Air Force Global Weather Central's (AFGWC) operational 5LAYER cloud forecasts, a new RH-to-cloud scheme was developed by relating cumulative frequencies of forecast RH to cumulative frequencies of analyzed cloud cover from the AFGWC RTNEPH cloud analysis. This scheme creates a series of forecast time-dependent RH-to-cloud curves that can be temporally updated to account for changes in season, cloud analysis, or forecast model, The global model used was a spectral-type developed by the Geophysics Laboratory (GL) using parameterized diabatic physics presently incorporated in the operational GSM (global spectral model) at AFGWC.
Phillips Laboratory Global Spectral Numerical Weather Prediction Model
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Author : Donald C. Norquist
language : en
Publisher:
Release Date : 1992
Phillips Laboratory Global Spectral Numerical Weather Prediction Model written by Donald C. Norquist and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Long-range weather forecasting categories.
Boundary Layer Parameterization For A Global Spectral Model
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Author : Larry Mahrt
language : en
Publisher:
Release Date : 1987
Boundary Layer Parameterization For A Global Spectral Model written by Larry Mahrt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Atmospheric models categories.
Much of the work has concentrated on interactions between the soil model and the model of the atmospheric boundary layer and the behavior of the boundary-layer package within the Air Force Global Spectral Model. Such studies have underscored the importance of the formulation of surface properties and transport within the underlying soil. Work during the contract period also focussed on elimination of several inadequacies of boundary-layer modelling. The inclusion of the statistical impact of subgrid variations of surface properties leads to a surface exchange coefficient which varies more smoothly with stability and does not decrease as rapidly with very stable conditions. Such modifications reduce the nocturnal cooling which is usually overestimated in boundary-layer models. Other improvements of the boundary-layer model in stable conditions have resulted from increasing the critical Richardson number in the boundary-layer depth formulation and adopting the Kondo formulation for the eddy diffusivity. The development of a formulation for boundary-layer cumulus has allowed inclusion of cloud-induced drying. Although this formulation leads to significant improvement of the boundary-layer predictions in cloudy situations, the general problem is far from solved. Keywords: Atmospheric boundary layer; Surface energy balance; Soil model; Stable layer parameterization; Surface fluxes. (jhd).
Performance Statistics Bulletin
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Author :
language : en
Publisher:
Release Date : 1992
Performance Statistics Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Ionospheric radio wave propagation categories.
Modifications To The Representation Of The Surface Layer Processes In The Phillips Laboratory Global Spectral Model
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Author :
language : en
Publisher:
Release Date : 1995
Modifications To The Representation Of The Surface Layer Processes In The Phillips Laboratory Global Spectral Model written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Boundary layer (Meteorology) categories.
Diagnostics For And Evaluations Of New Physical Parameterization Schemes For Global Nwp Models
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Author :
language : en
Publisher:
Release Date : 1900
Diagnostics For And Evaluations Of New Physical Parameterization Schemes For Global Nwp Models written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1900 with categories.
Meteorological And Geoastrophysical Abstracts
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Author :
language : en
Publisher:
Release Date : 1997
Meteorological And Geoastrophysical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Astrophysics categories.