摘要
利用1961—2012年东北地区霾日数统计资料,对东北地区霾的时空分布特征进行了详细分析,并利用EOF分解对霾日数进行了分型讨论。结果表明:东北地区1961—2012年霾日数虽然整体上呈下降趋势,但存在明显的年代际变化特征,霾日数在20世纪60—70年代较多,80年代之后下降;霾日数的月、季分布总体是春季霾日数最多,冬季次之,随后是夏季,秋季最少;EOF分析的第一模态主要表达了东北地区霾日数为80年代之前显著上升,80年代开始突然下降;1961—2012年大部分区域霾日数没有增加,且其中有约50%的区域呈现减少的趋势;霾日数的变化和分布与工农业发展状况密切相关,呈现的减少趋势是由于独特的历史造成的。
Based on haze the data days of chinese northeast during 1961-2012 , the characteristics and changes of temporal and spatial distributions of haze days are analysed ,as well as the method of vector EOF expansion is used to carry on a classification discussion .The results show that although the haze days in northeast of China during 1961-2012 exhibits declining trends as a whole ,but shows obvious decadal variation characteristics ;T here are more haze days during 1960s-1970s century , and then reduce significantly 1980s ;Haze day shows the character of more in winter half year and less in summer half year . The haze days are the most in spring ,then followed by winter ,summer ,autumn;The first mode of EOF analysis expresses that the haze days in the northeast experiences a marked increase tendency in the days before 1980s ,and then begins to fall suddenly ;In most area of the northeast of China ,the trend is not increasing in 1961-2012 ,and over 50% shows the tendency of decrease;The industrial and agricultural development are possible reasons of the variations ,and the declining trend is due to the unique history background .
出处
《黑龙江大学工程学报》
2015年第4期16-22,共7页
Journal of Engineering of Heilongjiang University
基金
中国科技部软科学研究计划项目(2012GXS4B071)
关键词
东北地区
霾
时空特征
EOF分解
Northeast of China
haze
spatial and temporal variations
EOF expansion
