摘要
利用南宫酸雨观测站2006—2009年的酸雨观测资料,统计分析了4年来酸雨时间分布特征,探讨了酸雨的变化规律,并对酸雨与气象要素的关系进行了初步分析。结果显示:酸雨发生频率63%,强酸雨频率28%;降水平均pH值为5.22,降水最小pH值为3.08;酸性降水量比例80%;降水平均K值为94.1μS/cm,最大K值为529.0μS/cm。酸雨存在着季节性变化,秋季是酸雨出现频率最多、酸性较强的季节;春季则是酸雨出现频率低的季节。酸雨的形成与风向风速、降水量、降水性质及大雾有关。
The statistical characteristics of precipitation acidity and conductivity at Nangong are discussed by means of the acid rain monitoring data from 2006 to 2009. Results show that the average precipitation pH is 5.22, with the lowest being 3.08; the averaged precipitation conductivity is 94.1 μS/cm with the highest value being 529.0 μS/cm for the 4 years; the acid rain frequency （pHi5. 6） is 63 %, which accounts for 80% of total precipitation amount of the four years; the severe acid rain frequency （pHi4.5） is 28%. Nangong is an area suffered from acid rain pollution relatively heavy in North China. The acid rain frequency shows a seasonal variation, high in autumn and low in spring. Consequently, the precipitation pH is low in autumn and high in spring. The relationships of precipitation acidity variation with surface wind conditions, precipitation amount, and precipitation types （including fog） are also discussed. The acid rain frequency in the daytime （10：00 to 16：00） is only 31%, much lower than that in the nighttime （72%）. The diurnal variation of local PM10 can be attributed to the differences of precipitation acidities in the daytime and nighttime.
出处
《气象科技》
2012年第6期1050-1055,共6页
Meteorological Science and Technology
关键词
酸雨
变化特征
气象因子
南宫市
acid rain, statistical characteristic, meteorological factor
