关键词: 雾, 气候, 贵州省

Abstract: The observed daily meteorological phenomena and visibility of 84 stations from 1961 to 2004 are used to study the special and temporal character of fog climatology in Guizhou Province Also daily ground and air temperature, relative humidity of 9 selected sample stations are also included The mean annual geographical distribution of fog frequency in Guizhou is randomly The average annual fog frequency is 299 days The stations with more than 60 mean annual fog day frequency scatter in the east, west and central area of Guizhou with relatively high altitude There are 3 stations whose annual fog frequencies exceed 100 days The highest fog frequency of Guizhou is 170 days in Dafang county of Bijie The seasonal and diurnal variations of fog occurrence are obviously Although fog may occur in each season, but most of fog occur in cold season (from October to February) and less from May to July On the diurnal time scale, fog events occur mainly on 0800 of local time The mean annual fog frequency show a decreasing trend with a rate of 006 day per year Further statistical study based on meteorological data show that the decrease of mean fog occurrence might be caused by several climate changed issues: a rising trend of the mean daily lowest temperature in winter, a decreasing trends in the difference between ground and surface air temperature,the annual mean difference between higest and lowest surface air temperature,and the annual mean surface relative humidity

Key words: fog, climatology, Guizhou Provimce