A Maritime Boundary Layer Model for the Prediction of Fog
A Maritime Boundary Layer Model for the Prediction of Fog

Author: Edward H. Barker

Publisher:

Published: 1975

Total Pages: 51

ISBN-13:

DOWNLOAD EBOOK

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
Fog and Boundary Layer Clouds

Author: Ismail Gultepe

Publisher: Springer Science & Business Media

Published: 2008-01-02

Total Pages: 307

ISBN-13: 3764384190

DOWNLOAD EBOOK

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
Marine Fog: Challenges and Advancements in Observations, Modeling, and Forecasting

Author: Darko Koračin

Publisher: Springer

Published: 2017-01-28

Total Pages: 540

ISBN-13: 3319452290

DOWNLOAD EBOOK

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
Marine Atmospheric Boundary Layer and Inversion Forecast Model

Author: David Almy Brower

Publisher:

Published: 1982

Total Pages: 137

ISBN-13:

DOWNLOAD EBOOK

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
Development of a Microcomputer Coupled Atmospheric and Oceanic Boundary Layer Prediction Model

Author: Gary Lee Tarbet

Publisher:

Published: 1983

Total Pages: 0

ISBN-13:

DOWNLOAD EBOOK

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 Evaluation of an Advection Fog Prediction Model
An Evaluation of an Advection Fog Prediction Model

Author: James Weyman

Publisher:

Published: 1984

Total Pages: 52

ISBN-13:

DOWNLOAD EBOOK

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
A Systems Study of Marine Fog Situations

Author: Shen C. Lee

Publisher:

Published: 1977

Total Pages: 79

ISBN-13:

DOWNLOAD EBOOK

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.