A Maritime Boundary Layer Model For The Prediction Of Fog
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A Maritime Boundary Layer Model For The Prediction Of Fog
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Author : Edward H. Barker
language : en
Publisher:
Release Date : 1975
A Maritime Boundary Layer Model For The Prediction Of Fog written by Edward H. Barker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Boundary layer (Meteorology) categories.
A two-dimensional boundary layer model is described. This model is designed to predict and study the effects of meteorological changes on the formation and dissipation of fog and stratus. Radiational heat loss along with the transport of static energy, moisture and momentum are treated in the model. Cloud droplet distributions are parameterized using a gamma distribution from which radiative properties and droplet fall velocities are computed. Turbulent exchange coefficients are calculated using the Monin-Obukhov theory of similitude which accounts for variations in atmospheric stability. Several experiments are presented which demonstrate the effects of various meteorological parameters on the formation and duration of stratus and fog. Energy budget analyses show the importance of each of the physical processes being modeled.
Fog And Boundary Layer Clouds
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Author : Ismail Gultepe
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-01-02
Fog And Boundary Layer Clouds written by Ismail Gultepe and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-01-02 with Science categories.
This topical volume of the Journal of Pure and Applied Geophysics utilizes new information not previously accessible for fog related research. It focuses on surface and remote sensing observations of fog, various numerical model applications using new parameterizations, fog climatology, and new statistical methods. The results presented in this special issue come from research efforts in North America and Europe.
Marine Fog Challenges And Advancements In Observations Modeling And Forecasting
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Author : Darko Koračin
language : en
Publisher: Springer
Release Date : 2017-01-28
Marine Fog Challenges And Advancements In Observations Modeling And Forecasting written by Darko Koračin and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-28 with Science categories.
This volume presents the history of marine fog research and applications, and discusses the physical processes leading to fog's formation, evolution, and dissipation. A special emphasis is on the challenges and advancements of fog observation and modeling as well as on efforts toward operational fog forecasting and linkages and feedbacks between marine fog and the environment.
Marine Atmospheric Boundary Layer And Inversion Forecast Model
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Author : David Almy Brower
language : en
Publisher:
Release Date : 1982
Marine Atmospheric Boundary Layer And Inversion Forecast Model written by David Almy Brower and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
A computer code for prediction of the marine atmospheric boundary layer is developed. The code is used to predict changes of the capping inversion height, the strength of the specific humidity and potential temperature 'jumps' at the inversion, the well-mixed relative humidity in the layer and the lifting condensation level for possible cloud/fog formation. The code is based on recently formulated integrated models for the clear or cloudy marine. Planetary boundary layer capped by an inversion. The initialization is based on radiosonde data and, as such, the code was developed to be used with the Integrated Refractive Effects Prediction System (IREPS) assessment Code. It has been extended to be used with any single platform having atmospheric sensing capabilities, radiosonde or dropsonde. IREPS and hence the MABL prediction code are under consideration for inclusion in Tactical Environmental Support System (TESS). (Author).
Development Of A Microcomputer Coupled Atmospheric And Oceanic Boundary Layer Prediction Model
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Author : Gary Lee Tarbet
language : en
Publisher:
Release Date : 1983
Development Of A Microcomputer Coupled Atmospheric And Oceanic Boundary Layer Prediction Model written by Gary Lee Tarbet and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Meteorology categories.
A coupled Marine Atmospheric Boundary Layer (MABL) and Oceanic Boundary Layer (OBL) model is developed using the Naval Postgraduate School and Garwood models respectively. All coding is done on the Hewlett-Packard 9845 microcomputer with emphasis on ease of use. The model is used to explore cases when feedback between the boundary layers significantly influences model forecasts. The sensitivity of the model to slight input variations is explored. Light wind situations where stratus or fog formation is extremely difficult to predict is investigated. Cases covered include variations in mixed layer depth and wind speed which produces significantly different forecasts from the initial input. (Author).
An Open Ocean Marine Fog Development And Forecast Model For Ocean Weather Station Papa
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Author : Robert Louis Clark
language : en
Publisher:
Release Date : 1981
An Open Ocean Marine Fog Development And Forecast Model For Ocean Weather Station Papa written by Robert Louis Clark and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Fog categories.
Marine fog forecasts during the summer period in the North Pacific are not made presently with any acceptable degree of accuracy. Objective fog development models exist and are used with some success for localized coastal regions of the western U.S.; scarcity of accurate data has hindered creation of a reliable open-ocean model. The Eulerian single-station approach, utilizing a segment of the complete accurate data of Ocean Weather Station Papa (50N, 145W) is applied in this study to an objective marine fog forecasting model. The time-series study of significant atmospheric variables at OWS Papa, when coupled with a chronological synoptic overview, delineates accurately fog/no fog sequences in the summer months of 1973 and 1977. Actual observed fog situations are evaluated by the general model and presented in relation to open-ocean fog indices, NOAA 5 satellite coverage and synoptic history. The open-ocean forecast model is tested on an independent data set for the month of July 1975 at OWS Papa, with favorable results. The research delineates four required indices that must all be positive to forecast fog. These indices, when plotted daily in the region of OWS Papa allow a single station to predict, with some confidence out to twenty-four hours, the occurrence of advection fog. (Author).
An Evaluation Of An Advection Fog Prediction Model
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Author : James Weyman
language : en
Publisher:
Release Date : 1984
An Evaluation Of An Advection Fog Prediction Model written by James Weyman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Fog categories.
In response to Air Weather Service requirements, the Air Force Geophysics Lab has been involved in research in the development of mesoscale advection fog prediction techniques. A two-dimensional fog prediction model developed at the Naval Environmental Prediction Research Facility (NEPRF) was selected for evaluation because it can operate on a mini-computer of the size planned for the Air Force's Automated Weather Distribution System (AWDS). Six case studies developed by Calspan Advanced Technology Center were used to test the model's accuracy. These case studies covered a wide range of fog/stratus formation and dissipation stages. Four major weaknesses were identified in the model. The most important was that cloud tops increased in temperature through infrared radiative heat processes rather than decreased. The other weaknesses include lack of solar radiation processes, unreliable treatment of the height of mixed layer during stable conditions, and insufficient handling of vertical motions. The model may have potential in AWDS. However, these weaknesses must first be corrected.
A Systems Study Of Marine Fog Situations
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Author : Shen C. Lee
language : en
Publisher:
Release Date : 1977
A Systems Study Of Marine Fog Situations written by Shen C. Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
This systems study of marine fog considers the dynamical interaction between the synoptical variations of meteorology and the microphysical phenomena in cloud physics. The resulting numerical program simulates the transport of heat, mass, and momentum in the atmospheric boundary layer where condensation/evaporation, thermal radiation, collision coalescence, and turbulent advection take place. Although this program is fairly complete, experimental data of the moisture supply process affected by turbulent winds at the air-sea interface are needed to establish a realistic model for systems analysis. When available field data are compared to predicted fog situations, it is found that the boundary layer model can qualitatively simulate fog situations over an open ocean, but the accurate prediction of a fog event at a specific time and place requires a working knowledge of the moisture supply process occasioned by air-wave interactions. Fog situations occur on the lee side of some topographical obstructions. The wind patterns associated with this type of fog generally have different directions with respect to the prevailing wind. A hypothesis is being formulated to explain such situations on the basis of recirculating flows. Some strange fog conditions have been logically explained by this hypothesis.
Diagnoses And Prediction Of Marine Boundary Layer Mesoscale Wind Phenomena
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Author : René V. Cormier
language : en
Publisher:
Release Date : 1970
Diagnoses And Prediction Of Marine Boundary Layer Mesoscale Wind Phenomena written by René V. Cormier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Ocean-atmosphere interaction categories.
Investigating Marine Boundary Layer Parameterizations By Combining Observations With Models Via State Estimation
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Author :
language : en
Publisher:
Release Date : 2015
Investigating Marine Boundary Layer Parameterizations By Combining Observations With Models Via State Estimation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
In this project we have improved numerical weather prediction analyses and forecasts of low level winds in the marine boundary layer. This has been accomplished with the following tools; The National Center for Atmospheric Research (NCAR) Weather and Research Forecasting model, WRF, both in his single column (SCM) and three-dimensional (3D) versions; The National Oceanic and Atmospheric Administration (NOAA) Wave Watch III (WWIII); SE algorithms from the Data Assimilation Research Testbed (DART, Anderson et al. 2009); and Observations of key quantities of the lower MBL, including temperature and winds at multiple levels above the sea surface. The experiments with the WRF SCM / DART system have lead to large improvements with respect to a standard WRF configuration, which is currently commonly used by the wind energy industry. The single column model appears to be a tool particularly suitable for off-shore wind energy applications given its accuracy, the ability to quantify uncertainty, and the minimal computational resource requirements. In situations where the impact of an upwind wind park may be of interest in a downwind location, a 3D approach may be more suitable. We have demonstrated that with the WRF 3D / DART system the accuracy of wind predictions (and other meteorological parameters) can be improved over a 3D computational domain, and not only at specific locations. All the scripting systems developed in this project (i.e., to run WRF SCM / DART, WRF 3D / DART, and the coupling between WRF and WWIII) and the several modifications and upgrades made to the WRF SCM model will be shared with the broader community.