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Author : Daniel H. Moser
Release : 2017
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis A Numerical Modeling Investigation of Entrainment in Cumulus Congestus Clouds and Its Effects Upon Precipitation by : Daniel H. Moser
Download or read book A Numerical Modeling Investigation of Entrainment in Cumulus Congestus Clouds and Its Effects Upon Precipitation written by Daniel H. Moser. This book was released on 2017. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Su-Tzai Soong
Release : 1985
Genre : Convection (Meteorology)
Kind : eBook
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Book Synopsis A Study of Cumulus Arameterization in a Global Circulation Model by : Su-Tzai Soong
Download or read book A Study of Cumulus Arameterization in a Global Circulation Model written by Su-Tzai Soong. This book was released on 1985. Available in PDF, EPUB and Kindle. Book excerpt: Objectives of this research are: (1) to critically evaluate the Kuo and Arakawa Schubert (A-S) cumulus parameterization schemes for numerical weather prediction; and (2) to improve these parameterization schemes to improve precipitation forecasts on the global scale. Major improvements to the Kuo scheme include prediction of cloud top height and incorporation of the effect of entrainment on cloud temperature and mixing ratio profiles. This enables the Kuo scheme to parameterize shallow to medium clouds as well as deep clouds. Tests of the Kuo scheme using a semi-prognostic approach and a cloud cluster model indicate that the improved version verifies better with observation during weaker convective periods. Experimental predictions were made and the results clearly demonstrated the ability of the AFGL model to predict large-scale stratiform precipitation. With incorporation of the modified Kuo scheme, the area of convective precipitation can also be well predicted. However, the predicted convective precipitation area is generally broader and the amount of rainfall smaller than observed which may be attributed to the resolution of the AFGL model in that it cannot resolve the narrow band of the cold front, ther major mesoscale rain-producing system. Implementation of the A-S scheme in the AFGL model also produced a reasonable distribution of convective precipitation but the precipitation area is more concentrated and sometimes is produced in an observed clear area. This result may be caused by the current implementation of the A-S scheme in the AFGL model, in which the cloud base is assumed to be 500 m above the ground surface.
Author : John Y. Liu
Release : 1968
Genre : Cloud physics
Kind : eBook
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Book Synopsis Numerical Modeling of Precipitation Effects on a Cumulus Cloud by : John Y. Liu
Download or read book Numerical Modeling of Precipitation Effects on a Cumulus Cloud written by John Y. Liu. This book was released on 1968. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kerry Emanuel
Release : 2015-03-30
Genre : Science
Kind : eBook
Book Rating : 133/5 ( reviews)
Book Synopsis The Representation of Cumulus Convection in Numerical Models by : Kerry Emanuel
Download or read book The Representation of Cumulus Convection in Numerical Models written by Kerry Emanuel. This book was released on 2015-03-30. Available in PDF, EPUB and Kindle. Book excerpt: This book presents descriptions of numerical models for testing cumulus in cloud fields. It is divided into six parts. Part I provides an overview of the problem, including descriptions of cumulus clouds and the effects of ensembles of cumulus clouds on mass, momentum, and vorticity distributions. A review of closure assumptions is also provided. A review of "classical" convection schemes in widespread use is provided in Part II. The special problems associated with the representation of convection in mesoscale models are discussed in Part III, along with descriptions of some of the commonly used mesoscale schemes. Part IV covers some of the problems associated with the representation of convection in climate models, while the parameterization of slantwise convection is the subject of Part V.
Author : Charles Cohen
Release : 2013-08
Genre :
Kind : eBook
Book Rating : 128/5 ( reviews)
Book Synopsis A Quantitative Investigation of Entrainment and Detrainment in Numerically Simulated Convective Clouds, Pt 1 by : Charles Cohen
Download or read book A Quantitative Investigation of Entrainment and Detrainment in Numerically Simulated Convective Clouds, Pt 1 written by Charles Cohen. This book was released on 2013-08. Available in PDF, EPUB and Kindle. Book excerpt: A method is developed which uses numerical tracers to make accurate diagnoses of entraimnent and detrainment rates and of the properties of the entrained and detrained air in numerically simulated clouds. The numerical advection scheme is modified to make it nondispersive, as required by the use of the tracers. Tests of the new method are made, and an appropriate definition of clouds is selected. Distributions of mixing fractions in the model consistently show maximums at the end points, for nearly undilute environmental air or nearly undilute cloud air, with a uniform distribution between. The cumulonimbus clouds simulated here entrain air that had been substantially changed by the clouds, and detrained air that is not necessarily representative of the cloud air at the same level.
