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中文摘要：
利用1976～2005年湖南地面观测资料,对全省97个地面站中能见度在1000 m以下的资料进行了归类整理,并根据规则将雾分为3级。对湖南大雾季节、月际的空间分布,年、月、日、年代际变化特点等气候特征及成因进行分析,结果表明：湖南大雾日整体分布呈西多东少特征;大雾具有明显季节、月际变化规律;大雾还具有明显日变化、周期性变化特征;大雾的时空变化与大气环流季节性变化、植被分布等密切相关;近年来大雾日呈现减少趋势,可能与城市化和经济的快速发展有关。
英文摘要：
Based on the surface observation data of Hunan Province during 1976-2005,the data with the visibility of less than 1 000 m at 97 ground stations of Hunan Province were classified.According to the relevant rule,the fog was divided into three levels.The seasonal and monthly spatial distribution,the climatic characteristics of annual,monthly,diurnal and decadal variation and causes of heavy fog in Hunan Province were analyzed.The results showed that there were more heavy foggy days in west Hunan from the whole distribution.Heavy fogs had obvious seasonal and monthly change laws.And heavy fogs had obvious diurnal and periodical variation characteristics.The temporal and spatial changes of heavy fogs were closely related with the seasonal variation of atmosphere circumfluence,the vegetation distribution and so on.During recent years,heavy foggy days showed a decreasing trend,which might be related with urbanization and the rapid development of economy.
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A new analytical model for thermal stresses in multi-phase materials and lifetime prediction methods
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