摘要
在湖南省邵阳市工业区测量表明,该区颗粒物含量处于相当高的水平,颗粒物的主要水溶性成分为Ca^(2+)、SO_4^(-)、NO_3^-、NH_4^+和Na^+。Ca^(2+)在大颗粒(dp>9.0um)富集度最高,而SO_4^(2-)在小颗粒(dp<2.0um)中最丰富。所有尺度的颗粒都具有中和酸的能力,随粒径增大而提高。讨论表明,颗粒物水冲刷对雨滴化学成分和酸度的影响对直径小于2000um的雨滴是相当灵敏的,这种影响主要由大颗粒提供。讨论结果与降水成分的监测资料相一致。气溶胶水冲刷机制有效地解释了城市酸雨频率的规律分布。
The particulates at industrial area of Shaoyan city in Hunan Province are in cosiderably high level. The water-soluble, compositions in the particles mainlyconsist of Ca2+, SO42-, NO3-, NH4+ and Na+, and Ca2+ in the large particles ( dp >9.0μm ) and SO42- in the fine particles(dp<2.0um)are the richest while NO3- increases with decrease of the particles sizes. The capability of neutralizing acids and neutralizing action of particles for all sizes are more remarkble for large particles. The caculation shows that the effects of washout of particules on chemical compositions and acidity of the rain drops are sensitive for the drops less than 2000μm in diameter and mainly result from the large particles. The monitoring data are consistent with the caculated results. It is available for aerosol washout mechanism to explain the distribution of the regular pattern of the aciditv of precipitation in the cities where have a less frequency of the acid rain at industrial area.
出处
《气象科学》
CSCD
北大核心
1989年第2期177-183,共7页
Journal of the Meteorological Sciences
