Diagnostics for and Evaluations of New Physical Parameterization Schemes for Global NWP Models

Diagnostics for and Evaluations of New Physical Parameterization Schemes for Global NWP Models PDF Author: Chien-Hsiung Yang
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 284

Get Book Here

Book Description
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

Diagnostics for and Evaluations of New Physical Parameterization Schemes for Global NWP Models PDF Author: Chien-Hsiung Yang
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 284

Get Book Here

Book Description
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

Diagnostics for and Evaluations of New Physical Parameterization Schemes for Global NWP Models PDF Author:
Publisher:
ISBN:
Category : Atmospheric physics
Languages : en
Pages : 282

Get Book Here

Book Description


Environmental Research Papers

Environmental Research Papers PDF Author:
Publisher:
ISBN:
Category : Environmental geology
Languages : en
Pages : 382

Get Book Here

Book Description


Development of a Cloud Forecast Scheme for the GL Baseline Global Spectral Model

Development of a Cloud Forecast Scheme for the GL Baseline Global Spectral Model PDF Author: Kenneth E. Mitchell
Publisher:
ISBN:
Category : Cloud forecasting
Languages : en
Pages : 166

Get Book Here

Book Description
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

Phillips Laboratory Global Spectral Numerical Weather Prediction Model PDF Author: Donald C. Norquist
Publisher:
ISBN:
Category : Long-range weather forecasting
Languages : en
Pages : 168

Get Book Here

Book Description


Boundary Layer Parameterization for a Global Spectral Model

Boundary Layer Parameterization for a Global Spectral Model PDF Author: Larry Mahrt
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 192

Get Book Here

Book Description
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

Performance Statistics Bulletin PDF Author:
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 520

Get Book Here

Book Description


Modifications to the Representation of the Surface Layer Processes in the Phillips Laboratory Global Spectral Model

Modifications to the Representation of the Surface Layer Processes in the Phillips Laboratory Global Spectral Model PDF Author:
Publisher:
ISBN:
Category : Boundary layer (Meteorology)
Languages : en
Pages : 92

Get Book Here

Book Description


Meteorological and Geoastrophysical Abstracts

Meteorological and Geoastrophysical Abstracts PDF Author:
Publisher:
ISBN:
Category : Astrophysics
Languages : en
Pages : 494

Get Book Here

Book Description


Government Reports Announcements & Index

Government Reports Announcements & Index PDF Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 934

Get Book Here

Book Description