Investigation of North Atlantic Fog and Development of a Marine Fog Forecast System

Ocean fog and haze were studied to provide additional expertise for An Expert-system for Shipboard Obscuration Prediction (AESOP). Task I studied fog occurrence in the N. Atlantic and developed an AESOP rule base for these fogs, Task II evaluated forecast errors generated during a test of AESOP, and...

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Bibliographic Details
Main Author: Rogers, C. W.
Other Authors: CALSPAN CORP BUFFALO NY
Format: Text
Language:English
Published: 1989
Subjects:
Meteorology
*MARINE ATMOSPHERES
*FOG
*OBSCURATION
*HAZE
BOUNDARY LAYER
DISSIPATION
RADIATION ABSORPTION
HEATING
ERRORS
SHIPBOARD
CONCENTRATION(COMPOSITION)
SOLAR RADIATION
MARINE METEOROLOGY
NORTH ATLANTIC OCEAN
ADVECTION
SUMMER
OPEN WATER
TEMPERATURE INVERSION
STRATUS CLOUDS
SHALLOW DEPTH
ANTICYCLONES
LOW HUMIDITY
FORECASTING
LAYERS
FOG DISPERSAL
AEROSOLS
PREDICTIONS
AESOP EXPERT SYSTEM
TAYLOR FOG
MIDLATITUDES
EXPERT SYSTEMS
PE62435N
WUDN656766
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/ADA211780
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA211780
Description
Summary:Ocean fog and haze were studied to provide additional expertise for An Expert-system for Shipboard Obscuration Prediction (AESOP). Task I studied fog occurrence in the N. Atlantic and developed an AESOP rule base for these fogs, Task II evaluated forecast errors generated during a test of AESOP, and modified and extended the rule base to correct for these errors. Fog is primarily a summertime phenomenon in the N. Atlantic. Taylor fog forms at midlatitudes (40-50N) in the stable, relatively shallow marine boundary layer which is located at the western end of the semi-permanent anticyclone. In the eastern N. Atlantic extratropical anticyclogenesis occasionally occurs, which can produce stratus lowering fog along its eastern side and Taylor fog in the southerly flow at its western end. At 50-60N in the track of the transient synoptic systems, much of the fog is advected in from the Taylor fog formation regions to the S and W. Fog dissipation is driven primarily by heating produced by absorption of solar radiation and mixing of warm air from above the inversion which caps the fog layer. These two dissipation processes are abetted by the mixing of the lower humidity of the warm air. Over the open ocean, the aerosol concentration is generally too low to provide even the minimum concentration required to produce a maximum haze visibility of 5 n mi.

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