Download or read book A Study of Wind Field Retrieval from Single Doppler Radar Data written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Wind Field Retrieval from Single Doppler Radar Data written by Ramón De Elía and published by . This book was released on 1997 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A variational semi-Lagrangian wind retrieval algorithm from single-Doppler radar data is studied both analytically and numerically, in order to understand its responses as well as limitations. The theoretical background on which the algorithm is based, is described in detail. A new approximation of the conservation equation of reflectivity for wind retrieval purposes is derived. It is shown that, in general, a unique wind field may not be available for the entire domain. However, some ways of minimizing this inconvenience are presented. The existence of a spurious solution when the conservation equation of a tracer is discretized is found analytically. A real case (a storm characterized by a mesocyclonic circulation) is used in order to illustrate the problem of the non-uniqueness of the solution. This is carried out through the study of the sensitivity of the algorithm to the moving frame and the initial guess. In addition, the influence of each one of the constraints used (conservation of reflectivity, continuity equation, smoothness constraint) in the retrieved wind field are analyzed. It is concluded that in spite of the sources of error described, the results may be meaningful." --
Download or read book Variational Analysis Methods for Retrieval of Wind Field from Single doppler Radar Data written by Stéphane Laroche and published by . This book was released on 1994 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The variational analysis methods are applied to retrieve the steady state wind field from single-Doppler radar data. The wind field is retrieved by fitting, in the least-squares sense, constraining model equations to observations measured during a short assimilation period (2 or 3 time sequences). The weak and strong constraint formalisms are reviewed and examined using the one-dimensional linear advection equation as a constraint. It is shown that the retrieval is not unique, but the problem can be controlled by a smoothness constraint. Variational two-dimensional and three-dimensional wind retrieval algorithms are developed and tested using actual dual-Doppler radar data. The conservation of reflectivity and the radial momentum equation are used as weak constraints in both algorithms. The anelastic form of the continuity equation is also included as a strong constraint in the three-dimensional algorithm. The two-dimensional algorithm is tested and compared to echo tracking methods using Doppler radar observations in the clear-air planetary boundary layer. The resolution at which the methods can effectively retrieve the horizontal wind field is examined in detail. The variational algorithm can properly retrieve wind structures greater than 10 km wavelength. The three-dimensional algorithm is tested using observations of a precipitating microburst. It is demonstrated that the three-dimensional wind field can be retrieved, but the method fails near the ground level. In addition, the retrieval is sensitive to the radar position relative to the observational domain due to systematic model errors. The computational efficiency of the three-dimensional wind retrieval algorithm allows its semi-operational implementation at the J. S. Marshall Radar Observatory of McGill University." --
Download or read book Variational Analysis Methods for Retrieval of Wind Field from Single Doppler Radar Data microform written by Stéphane Laroche and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1994 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Retrieval of Three dimensional Wind and Temperature Fields from Single Doppler Radar Data written by Dawn Gustine Wolfsberg and published by . This book was released on 1987 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radar Meteorology written by Robert M. Rauber and published by John Wiley & Sons. This book was released on 2018-05-29 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive introduction to the current technology and application of radar in meteorology and atmospheric sciences Written by leading experts in the field, Radar Meteorology, A first Course offers an introduction to meteorological radar systems and applications, with emphasis on observation and interpretation of physical processes in clouds and weather systems. This comprehensive introduction to the subject offers an overview of the quantities essential to radar meteorology including the radar reflectivity factor, and Doppler, dual-polarization, and multi-wavelength radar variables. The authors highlight wind retrieval from single and multiple Doppler radars, precipitation estimation and hydrometeorological applications, with chapters dedicated to interpretation of radar data from warm season mid-latitude severe weather, winter storms, tropical cyclones and more. In addition, Radar Meteorology highlights research applications of this burgeoning technology, exploring dynamic applications such as space-borne and ground-based vertically pointing radar systems, and cloud, airborne and mobile radars. As meteorological radars are increasingly used professionally for weather observation, forecasting and warning, this much-needed text: • Presents an introduction to the technical aspects and current application of radar as used in the meteorology and atmospheric sciences • Contains full-colour illustrations that enhance the understanding of the material presented • Examines the wide-range of meteorological applications of radar • Includes problems at the end of each chapter as a helpful review of the contents • Provides full instructor support with all illustrations and answers to problems available via the book’s instructor website. Radar Meteorology offers a much-needed introductory text to the study of radar as applied to meteorology. The text was designed for a one semester course based on the authors’ own course in Radar Meteorology at the University of Illinois at Urbana-Champaign.
Download or read book Doppler Radar Data Analysis written by Urs Germann and published by . This book was released on 1997 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlation of Doppler radar Velocities and Reflectivities with Application to Retrieving the Transverse Wind written by Glenn Richard Smythe and published by . This book was released on 1981 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Smoothing the Doppler Radar Derived Wind Field on Perturbation Pressure Retrieval written by George Philip Rosser (Jr.) and published by . This book was released on 1986 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gridded u and v wind components derived from dual-Doppler radar data were utilized to study the behavior of the perturbation pressure field when different amounts of smoothing were applied to the wind field. Data-void areas in the wind field were filled by extrapolation. Three-point and nine-point smoothing operators were employed to smooth the wind field prior to retrieving the perturbation pressure field. Smoothing the wind field produced a nonlinear variation of the central pressure value in a meso-low with respect to the smoothing parameter. The central pressure value decreased as the smoothing parameter increased. Pressure centers less than 0.1 kPa (1 mb) in absolute magnitude tended to amplify and migrate slightly. False pressure centers created by the data-void filling technique were removed when a smoothing parameter greater than or equal to 0.4 was employed. Smoothing parameters greater than or equal to 0.5 created a false pressure center. (Author).
Download or read book Radar for Meteorological and Atmospheric Observations written by Shoichiro Fukao and published by Springer Science & Business Media. This book was released on 2013-08-16 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: Epoch-making progress in meteorology and atmospheric science has always been hastened by the development of advanced observational technologies, in particular, radar technology. This technology depends on a wide range of sciences involving diverse disciplines, from electrical engineering and electronics to computer sciences and atmospheric physics. Meteorological radar and atmospheric radar each has a different history and has been developed independently. Particular radar activities have been conducted within their own communities. Although the technology of these radars draws upon many common fields, until now the interrelatedness and interdisciplinary nature of the research fields have not been consistently discussed in one volume containing fundamental theories, observational methods, and results. This book is by two authors who, with long careers in the two fields, one in academia and the other in industry, are ideal partners for writing on the comprehensive science and technology of radars for meteorological and atmospheric observations.
Download or read book Real data Tests of a Single Doppler Radar Assimilation System written by Thomas Nehrkorn and published by . This book was released on 1994 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Doppler Radar Observations written by Joan Bech and published by BoD – Books on Demand. This book was released on 2012-04-05 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doppler radar systems have been instrumental to improve our understanding and monitoring capabilities of phenomena taking place in the low, middle, and upper atmosphere. Weather radars, wind profilers, and incoherent and coherent scatter radars implementing Doppler techniques are now used routinely both in research and operational applications by scientists and practitioners. This book brings together a collection of eighteen essays by international leading authors devoted to different applications of ground based Doppler radars. Topics covered include, among others, severe weather surveillance, precipitation estimation and nowcasting, wind and turbulence retrievals, ionospheric radar and volcanological applications of Doppler radar. The book is ideally suited for graduate students looking for an introduction to the field or professionals intending to refresh or update their knowledge on Doppler radar applications.
Download or read book Storm and Cloud Dynamics written by William R. Cotton and published by Academic Press. This book was released on 2010-12-21 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt: Storm and Cloud Dynamics focuses on the dynamics of clouds and of precipitating mesoscale meteorological systems. Clouds and precipitating mesoscale systems represent some of the most important and scientifically exciting weather systems in the world. These are the systems that produce torrential rains, severe winds including downburst and tornadoes, hail, thunder and lightning, and major snow storms. Forecasting such storms represents a major challenge since they are too small to be adequately resolved by conventional observing networks and numerical prediction models. Provides a complete treatment of clouds integrating the analysis of air motions with cloud structure, microphysics, and precipitation mechanics Describes and explains the basic types of clouds and cloud systems that occur in the atmosphere-fog, stratus, stratocumulus, altocumulus, altostratus, cirrus, thunderstorms, tornadoes, waterspouts, orographically induced clouds, mesoscale convection complexes, hurricanes, fronts, and extratropical cyclones Summarizes the fundamentals, both observational and theoretical, of atmospheric dynamics, thermodynamics, cloud microphysics, and radar meteorology, allowing each type of cloud to be examined in depth Integrates the latest field observations, numerical model simulations, and theory Supplies a theoretical treatment suitable for the advanced undergraduate or graduate level, as well as post-graduate
Download or read book Radar Meteorology written by S. Raghavan and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: As we all know, weather radar came into existence during the Second World War when aircraft detection radars had their vision limited by echoes from rain bearing clouds. What was often considered to be of nuisance value by the air force personnel trying to locate enemy aircraft was seen as an opportunity by the weather men. Thus adversity in one field was converted into an opportunity in another. Since then weather radar has found myriad applications with the increased sophistication of technology and processing systems. It has now become an indispensable tool for the operational forecasters, cloud physicists and atmospheric scientists. The current generation radar is but a distant echo of the radars of the 1940s. As a result, its operation and maintenance have become very complex, like the technology it uses. Therefore, there is a definite requirement of focussing our special attention not only on the science of radar meteorology but also on its operational aspects. The present book, as pointed out by the author, attempts to fill this gap. The author has presented the subject with a balanced blend of science, technology and practice. The canvas is indeed very broad. Starting with the history of weather radar development the book goes on to discuss in a lucid style the physics of the atmosphere related to radar observation, radar technology, echo interpretation, different applications and finally attempts to look into the future to indicate potential new opportunities in this field.
Download or read book Application and Evaluation of Wind Retrieval Algorithms for a Single Doppler Radar written by Kurt Duane Hondl and published by . This book was released on 1990 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radar and Atmospheric Science written by Roger Wakimoto and published by Springer. This book was released on 2015-03-30 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book if a tribute to one of the leading scientists in meteorology, Dr. David Atlas. It was written by a group of specialists and presented at a symposium to honor Dr. Atlas’ life and career as meteorologist. It serves as a comprehensive resource for scientists and educators, and also as an inspiring historical record of scientific research and important discoveries in the field of meteorology.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
