【摘要】 利用1981—2013年菏泽市地面气象观测资料,对菏泽市霾日数变化特征及其影响因素进行了分析。结果表明:近33年菏泽霾日数总体呈上升趋势,1980—1990年代霾日数较少,2000年之后明显上升。菏泽年平均霾日数为10.8天。菏泽秋冬季霾天气出现多,春夏季出现少。菏泽霾天气95%以上为轻微霾(大气能见度5~10 km),相对湿度在70%~90%的占8成以上。霾日数变化对气温和风速的变化较为敏感。霾天气发生时,一般风速比较小(1~2 m/s),并以N风最多。正变湿和负变压对霾的生成和维持更加有利。连续无降水日数越长,出现霾的概率就可能越大。更多还原

【Abstract】 Based on observation data from 1981 to 2013 in Heze,haze characteristics and its formation mechanism were analyzed.The results show that:the haze showed a generally rising trend over the past 33 years,from 1981 to 2000 haze days was less,but a obvious rising trend after 2000.The average annual haze day was 10.8 days in Heze.Hazes mainly occurred in autumn and winter.When a haze occurred,the visibility mostly from 5 to 10 km,and the relative humidity ranged from 70% to 90%.Haze days change was more sensitive to the change of temperature and wind speed.Haze appears in when the wind speed was quite generally small(1-2 m/s),the wind direction was north.The enhanced relative humidity and the weak pressure field was more advantageous to the haze formation.If does not rain continuously,the probability of haze was much bigger.更多还原