Studying Marine Fog Using Weather Research And Forecast Wrf Model
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Studying Marine Fog Using Weather Research And Forecast Wrf Model
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Author : Zheqi Chen
language : en
Publisher:
Release Date : 2021
Studying Marine Fog Using Weather Research And Forecast Wrf Model written by Zheqi Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Fog can seriously affect daily life. However, due to the complex mechanisms involved, accurate and in time fog forecasts are still difficult. This study has used the Weather Research and Forecast model (WRF) to simulate marine advection fog over Sable Island, NS in summer 2018. Chapter 2 uses the real case simulation to find a good physics parameterization and apply it as a daily forecast. The results show that the model tends to give much lower visibility than observations on this small offshore island. Chapter 3 uses the single column model to simulate an advection fog. Different gravitational settling options have been examined, and it is found that the turbulent deposition can be a good solution to the problem. In Chapter 4 the turbulent deposition is tested in the real case simulation. The results show that the visibility can become higher, but further study is needed.
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.
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).
Refinement Of A Statistical Diagnostic Model Of Marine Fog Using Fnwc Model Output Parameters
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Author : Steve O'Neal Ouzts
language : en
Publisher:
Release Date : 1979
Refinement Of A Statistical Diagnostic Model Of Marine Fog Using Fnwc Model Output Parameters written by Steve O'Neal Ouzts and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Meteorology categories.
They study represents a continuation of the development of a model output statistics scheme to specify marine fog over the open ocean and in coastal waters. Thirty-seven direct and derived Fleet Numerical Weather Central model output parameters, monthly climatological fog frequencies, combinations of the aforementioned parameters (i.e. interactive parameters) and a persistence parameter are used as predictors in a stepwise multiple linear regression approach to estimate a predictand defined as marine fog probability. The predictand is categorized in two ways, in one case (FOGCAT 1) as smoothed probabilities for 0 to 100% as a function of present weather, past weather, visibility and low cloud type; and, in another case (FOGCAT 2) as a limited number of discrete probabilities (to include 0 and 100%) derived form presetn weather, past weather and visibility only. This study derives diagnostic regression equations only using as a dependent data sample over 24,000 surface synoptic ship observations at 0000 GMT for June through August 1976 and 1977. The predictor parameters contributing most significantly to the variance are sensible and evaporative heat fluxes, monthly climatologial fog frequencies, and meridional wind speed.
An Investigation Of Marine Fog Forecast Concepts
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Author : C. W. Rogers
language : en
Publisher:
Release Date : 1981
An Investigation Of Marine Fog Forecast Concepts written by C. W. Rogers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
As a follow-on to eight years of field study of marine fog, an investigation of potential fog forecasting concepts was initiated. Task 1 involved examination and interpretation of synoptic scale meteorological data in terms of micro- and meso-scale marine fog data acquired by Calspan on previous West Coast field studies. The results of this investigation were summarized in an experimental 'decision tree' for use in the forecasting of marine fog. As Task 2, Calspan conducted a descriptive investigation of the circumstances and characteristics of marine fog occurring in the northern Gulf of Mexico through analysis and interpretation of fog data previously acquired by Calspan during the Panama City II experiment. (Author).
Advances In Observations And Modeling Of Physical Processes In The Marine Environment
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Author : Guihua Wang
language : en
Publisher: Frontiers Media SA
Release Date : 2023-02-08
Advances In Observations And Modeling Of Physical Processes In The Marine Environment written by Guihua Wang and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-02-08 with Science categories.
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.
Numerical Prediction Of Marine Fog Using The Coupled Ocean Atmosphere Mesoscale Prediction System Coamps
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Author : John L. Dumas
language : en
Publisher:
Release Date : 2001-03-01
Numerical Prediction Of Marine Fog Using The Coupled Ocean Atmosphere Mesoscale Prediction System Coamps written by John L. Dumas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-03-01 with categories.
The U.S. Navy's requirement for a computer prediction system for marine fog and stratus dates back to the 1970s when meteorological models were being introduced to the fleet. The Naval Research Laboratory's Coupled Ocean/ Atmosphere Mesoscale Prediction System (COAMPS) is a leap forward in the Navy's numerical modeling ability but it still does not show great skill in fog forecasting. COAMPS has been 'tuned', or adjusted for certain constants and parameterizations, so that it has the minimum error for the maximum area. This tuning is a common practice for all numerical models. The objective of this thesis is to determine if changes can be made to the existing COAMPS code based on reasonable physical experiments for a specific location to help solve the numerical fog forecasting problem. The effectiveness of these experiments was first measured by comparing a modeled cloud edge to satellite imagery of Monterey, California taken during a week in August 2000 under a variety of foggy conditions. Comparisons were also made with observations taken from an aircraft, land stations and a vertical profiler. The experiments, specifically those regarding changes to the autoconversion and turbulent kinetic energy schemes, showed that while a perfect solution has not been found, it is possible to modify the model physics codes and optimize its performance in a specific region.
An Evaluation Of Marine Fog Forecast Concepts And A Preliminary Design For A Marine Obscuration Forecast System
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Author : E. J. Mack
language : en
Publisher:
Release Date : 1983
An Evaluation Of Marine Fog Forecast Concepts And A Preliminary Design For A Marine Obscuration Forecast System written by E. J. Mack and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Calspan's studies produced phenomenological descriptions of at least five new fog types, provided realistic verification on which to base new numerical modeling techniques, and developed synoptic and statistical relationships which could be used in operational forecasting. Under the current contract, Calspan conducted an objective evaluation of these predictive approaches, along with a select group of numerical models, by testing against data sets derived from at-sea observational studies. The results of this evaluation demonstrated that, with high-quality data, certain models can provide operationally useful forecasts for marine obscuration. It is also concluded that new knowledge of the physics of marine fog occurrence can help optimize the application of various forecast techniques and also serve as a back-up forecast tool. As a chief objective of this investigation, we outlined a preliminary version of an obscuration forecast system which, when fully developed, would incorporate this new knowledge and delineate the application of specific numeric and/or synoptic and statistical approaches; i.e., the system would specify a forecast tool tailored to the attendant meteorological scenario and functional within operational constraints. This report summarizes the research effort and results which led to the conceptual design of this forecast system.
Marine Navigation And Safety Of Sea Transportation
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Author : Adam Weintrit
language : en
Publisher: CRC Press
Release Date : 2013-06-05
Marine Navigation And Safety Of Sea Transportation written by Adam Weintrit and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-05 with Mathematics categories.
The TransNav 2013 Symposium held at the Gdynia Maritime University, Poland in June 2013 has brought together a wide range of participants from all over the world. The program has offered a variety of contributions, allowing to look at many aspects of the navigational safety from various different points of view. Topics presented and discussed at the Symposium were: navigation, safety at sea, sea transportation, education of navigators and simulator-based training, sea traffic engineering, ship's manoeuvrability, integrated systems, electronic charts systems, satellite, radio-navigation and anti-collision systems and many others. This book is part of a series of four volumes and provides an overview of Problems in Marine Navigation and is addressed to scientists and professionals involved in research and development of navigation, safety of navigation and sea transportation.