摘要
对雾天、晴天和阴天3种不同天气背景下边界层气象条件对PM10质量浓度影响进行了分析,结果表明:夜间到早上,由于3种天气均出现有逆温且高低空风速较小,PM10向高空扩散能力弱,在污染源排放明显减弱的情况下PM10质量浓度呈现自然下降态势,雾天由于相对湿度大,水汽的吸附作用,PM10质量浓度下降速度比晴天和阴天快;上午,阴天升温不及雾天和晴天快且高低空风速也比较小,导致PM10质量浓度上升速度比雾天和晴天快;午后,由于晴天增温快,温度高,高低空风速大,PM10质量浓度下降速度快,雾天温度增速不及晴天且地面风速变化不大,PM10质量浓度下降速度要低于晴天,阴天增温速度明显比晴天和雾天慢,高低空风速较小,PM10质量浓度降低速度慢,相对质量浓度高.
The boundary observation shows that the meteorological conditions in the boundary layer have direct effects on PM10 concentration under the conditions of foggy, sunlit and cloudy. From night to morn ing, because three kinds of weather conditions are in the thermal inversion layer and wind speed is small in high altitude and near the surface, the upward spread of PM10 is weak. The PM10 concentration is cantly weakened with the declination of pollution emissions. Due to the high relative humidity and signifi the ad sorption of water vapor, the rate of PM10 concentration declines faster that in the fog than sunny and cloudy. From morning to noon, the temperature rises more slowly in cloudy days than in sunny days and fogs, and the wind speed is too small in cloudy days directly leading to that the rate of PM10 concentration increasing is faster in cloudy days than that in sunny days and fogs. From noon to afternoon, there are higher temperature and faster warming in sunny days, and the wind speed is large in high latitude and near the surface, so the concentrations of PM10 decrease fast. The rate of warming is slower in foggy days than sunny days, so the rate of PM10 concentration declining is smaller than in sunny days, which is similar in cloudy days.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第11期101-108,共8页
Journal of Southwest China Normal University(Natural Science Edition)
基金
中国气象局2012年公益性行业(气象)科研专项(GYHY201206028)
关键词
边界层气象条件
PM10
日变化
影响分析
Boundary layer meteorological conditions
PM10
diurnal variation
impact analysis
