江苏省高影响性大雾天气演变特征及综合影响评估

利用江苏省分布较为均匀的59个台站1961—2006年的大雾日数资料，分析了大雾日数的年际变化特征；利用1961—2006年南京、淮安、徐州、赣榆、射阳、东台、吕泗、溧阳8站的资料重点研究了大雾的生成、消散及大雾持续时间变化特征。结果表明，年雾日数呈先升后降的分布形势，80年代前中期为大雾的鼎盛期，之后呈较快的下降趋势。大雾持续时间呈显著增长趋势，主要表现为雾消时间的推迟。考虑大雾日数和大雾持续时间2个因子的综合作用，设计了大雾综合影响指数，该指数的年际变化表征了江苏区域大雾天气的高影响性趋强。

Compositive Impact Evaluation of High Impact Heavy Fogs in Jiangsu Province

Using the observation data from 59 stations from 1961 to 2006 in Jiangsu Province,an analysis is made of the annual variation characteristics of heavy fog days.A further research on the generation,dissipation,and duration variation characteristics of heavy fog is conducted by means of the data from 8 stations from 1961 to 2006.The results show that the number of annual fog days increased from 1961,reached the peak in the early 1980s,and declined fast afterward;the heavy duration showed a marked increase trend,mainly the postponement of fog dissipation.A compositive impact index,including the effect of fog days and fog duration,is designed to reflect the fact that high-impact heavy fogs become more serious around the Jiangsu region.