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Languages : en
Pages : 0
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We have successfully implemented an explicit cloud scheme within the Florida State University Global Spectral Model. This includes the liquid water mixing ratio and cloud fractions as two additional dependant variables. The main purpose of this extension is two fold: we wished to improve our global cloud forecasting capability (low, medium and high clouds) and to have a better definition of the cloud radiative effects. A band model is being used for the short and long wave radiative transfer. A major component of this study is the initialization of clouds. For this purpose we have utilized the U.S. Air Force Real-Time Nephanalysis product called RTNEPH. The microwave radiances from the U.S. Air Force fleet of DMSP satellites is another source of data. These are the special sensor microwave instruments carried by these satellites. This information provides measures of vertically integrated liquid water mixing ratios. The liquid water mixing ratios are vertically partitioned using weights from the RTNEPH; this provides an initial definition of clouds and cloud fractions. These were further initialized using the procedure of physical initialization. The impact studies of this cloud specification and initialization appear very promising.
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Category :
Languages : en
Pages : 0
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Book Description
We have successfully implemented an explicit cloud scheme within the Florida State University Global Spectral Model. This includes the liquid water mixing ratio and cloud fractions as two additional dependant variables. The main purpose of this extension is two fold: we wished to improve our global cloud forecasting capability (low, medium and high clouds) and to have a better definition of the cloud radiative effects. A band model is being used for the short and long wave radiative transfer. A major component of this study is the initialization of clouds. For this purpose we have utilized the U.S. Air Force Real-Time Nephanalysis product called RTNEPH. The microwave radiances from the U.S. Air Force fleet of DMSP satellites is another source of data. These are the special sensor microwave instruments carried by these satellites. This information provides measures of vertically integrated liquid water mixing ratios. The liquid water mixing ratios are vertically partitioned using weights from the RTNEPH; this provides an initial definition of clouds and cloud fractions. These were further initialized using the procedure of physical initialization. The impact studies of this cloud specification and initialization appear very promising.
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Category :
Languages : en
Pages : 116
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The completed research is in the area of cloud prediction with a high resolution global model. We have extended our studies on the handling of implicit clouds (i.e. clouds specified as a function of prevailing humidity). We have also examined this problem in the context of rainfall initialization (called physical initialization). We demonstrate a strong positive impact on cloud forecasts from such an initialization. We have also made a start on the problem of explicit cloud forecasts using cloud water mixing ratio and cloud fractions as basic forecast variables. Our preliminary results, described in the final report, are very encouraging. Mannoji (1994) has in fact noted a slight superiority of the explicit over the implicit scheme. That work was performed using a low resolution global model. Further work on the improvement of the explicit scheme at higher resolution is required. Cloud prediction, Global modelling of clouds.
Author: Donald C. Norquist
Publisher:
ISBN:
Category : Cloud forecasting
Languages : en
Pages : 154
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ISBN:
Category :
Languages : en
Pages : 1046
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Author: United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Defense
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Category : History
Languages : en
Pages : 1040
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Author:
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ISBN:
Category : Numerical weather forecasting
Languages : en
Pages : 156
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Author: United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Defense
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Category : United States
Languages : en
Pages : 1030
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Author: United States. Congress. House. Committee on Appropriations. Subcommittee on Foreign Operations, Export Financing, and Related Programs
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Category : Economic assistance, American
Languages : en
Pages : 808
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Category :
Languages : en
Pages : 0
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This is a study of diagnostic cloud schemes to examine the variability of cloud fractions in monsoon systems. Includes simulation the middle tropospheric cyclone (MTC) of the Asian monsoon. Cloud radiation is a key factor in the thermodynamic control of the local east-west circulation. Also showed is the coalescence of small vorticity elements; these coalesce to form a parent large scale mid-tropospheric cyclone The study of thermodynamics of this system constitutes this research. Various methods for determining precipitation rates associated with the MTC are included and precipitation is shown to be due to convective processes rather than stable processes which are characterized by the general monsoon pattern.
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Category : Environmental geology
Languages : en
Pages : 166
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