凉城县近52年烟幕天气特征分析

Analysis on the characteristics of smoke screen in Liangcheng county in recent 52 years

本文利用凉城县地面气象观测站1960--2011年气象观测资料,对凉城地区烟幕日数进行了初步统计分析,统计结果得出,凉城县烟幕日年均为7.7天,近50年烟幕日数总体上呈阶梯式增多趋势,有明显年代际变化规律:上世纪60年代无烟幕日数,70年代与80年代日数相当,在10日以下,到了90年日数呈增多态势,且增幅较大,尤其进入本世纪前10年,大都盘踞在20多次以上。主要出现在冬季,12月和1月为全年的峰值,其次是11月和2月。

Based on the meteorological observation data of Liangcheng meteorological observatory from1960to2011,this paper makes a preliminary statistic analysis of the number of smokescreen days in Liangcheng area.According to the statistic result,the average annual smog of Liangcheng County is7.7days,nearly50The number of smoky days in the year shows a trend of increasing in stages with obvious decadal variation:the days of smokeless screens in the1960s,the days of the1970s and the1980s are quite similar,and the numbers of days in the1970s and the1980s show an increasing trend with an increase of more than10days Large,especially into the first10years of this century,most entrenched in more than20times.Mainly in winter,December and January for the whole year peak,followed by November and February.