The Characteristic Analysis Of Shanghai Coastal Sea Fog

The sea fog which happens on the sea, is one of the disastrous weather.It mainly happens in winter season and spring season, and often affectsthe normal operation and the safety of shipping routes. So far, Shanghaicoastal sea fog caused by maritime accidents account for about48%of thetotal number of various types of accidents at sea. Visibility is a standardto judge whether the sea fog occurs or not. Generally speaking, the lowerthe sea visibility is, then the higher the probability of maritimeaccidents. When the visibility is less than or equal to200m,it isextremely easy to occur accident. This paper taking the observation dataof two Shanghai coastal marine stations only which have the visibilitydata, and also it taking Shanghai maritime bureau of maritime accidentdata, remote sensing data, discussed the sea fog formation frequencyvariation characteristics of sea fog, the temporal and spatial change andcontinuity characteristics. At the same time, related to the use ofsynthetic, regression method, studied Shanghai coastal sea fog formationand maintenance of the hydrological and meteorological conditions andinfluencing factors. Through comparing the fog days, combined with theweather map and the NCEP reanalysis data, this paper gets the main synopticsituation when the sea fog happens and the proportion of all kinds ofsituation.