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| 上甸子本底站气溶胶散射系数变化特征的初步分析 | |
| 引用本文： | 苏晨,张小玲,刘强,汤洁.上甸子本底站气溶胶散射系数变化特征的初步分析[J].气候与环境研究,2009,14(5):537-545. |
| 作者姓名： | 苏晨 张小玲 刘强 汤洁 |
| 作者单位： | 1. 中国气象局北京城市气象研究所,北京,100089 2. 中国气象局北京城市气象研究所,北京,100089;北京上甸子大气本底污染监测站,北京101507 3. 北京市气象局大气探测技术保障中心,北京,100089 4. 中国气象科学研究院,北京,100081 |
| 基金项目： | 科技部公益类重点项目2001DIA10009、公益性行业(气象)科研专项经费项目GYHY200806027、国家重点基础研究发展计划项目 2006CB03703和北京区域气象科技创新基金项目 BRMCCX200604 |
| 摘 要： | 根据上甸子大气成分本底站从2004～2006年的连续观测数据,分析了区域大气粒子光散射系数的变化特点,以了解本底地区大气气溶胶粒子的基本特征.卜甸子地区3年数据比较表明,散射系数平均水平较低,但在2006年有所升高,主要表现在受春季沙尘天气的影响,污染次数增多.其次,散射系数日变化规律表现为白大低夜间高,午后出现最低值,此变化与大气层结的日变化趋势一致.从季节变化看,冬季和春季的散射系数相对较低,而夏季和秋季的值较高,这与气象条件及内外源的影响都有关系.天气对粒子变化的影响表现为,晴天无云时的大气状况有利于污染物的重直输送,散射系数远远低于阴天时的数值.另一方面,风向对本底站粒子浓度影响也较明显.来自东北东方向的空气较干净,散射系数值通常较低,而西南西风向通常会引起散射系数值的增大,说明位于西南方向上的北京等城镇的污染输送对上甸子本底站的大气状况有一定影响.最后,通过拟和散射系数小时平均值出现频率曲线,对上甸子地区本底浓度值作了初步估算,其范围在10~20 Mm~(-1). |
| 关 键 词： | 气溶胶光散射系数 浊度仪 华北地区 本底站 |
Analysis of the Characteristics of Aerosol Scattering Coefficient at Shangdianzi Background Station |
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| SU Chen,ZHANG Xiaoling,LIU Qiang,TANG Jie.Analysis of the Characteristics of Aerosol Scattering Coefficient at Shangdianzi Background Station[J].Climatic and Environmental Research,2009,14(5):537-545. | |
| Authors: | SU Chen ZHANG Xiaoling LIU Qiang TANG Jie |
| Abstract: | The aerosol scattering coefficient(σ_(sp))data observed at Shangdianzi atmospheric background station from 2004 to 2006 have been used to analyze the characteristics of aerosol in the background region.The results show that the mean annual σ_(sp) was relatively low with a slight increase in 2006,which is specially caused by frequent dust pollutions happening during the spring.Diurnal change has a dropping trend in the daytime and a rising trend at night,which accords with the daily change of atmospheric stratification.Seasonally,the values of σ_(sp) in winter and spring were lower than that in summer and autumn.Moreover,weather impacts aerosol obviously.The mean σ_(sp) in sunny days was much lower than that in cloudy condition,due to the strong convection that can increase the aerosol diffusion in sunny days.The air from east-northeast east was clean,which could decrease σ_(sp),while sourh-west wind could bring more polluted air and cause the increase in σ_(sp),which shows that the city activities had an effect on the atmosphere at the observing site.Finally,the background value was calculated through the most frequent statis-tics value,which was in the range of 10-20 Mm~(-1). |
| Keywords: | aerosol scattering coefficient nephelometer North China background station |
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