首页|南京北郊秋冬季相对湿度及气溶胶理化特性对大气能见度的影响

南京北郊秋冬季相对湿度及气溶胶理化特性对大气能见度的影响

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
  • 维普
为了解南京北郊秋冬季相对湿度与气溶胶理化特性对大气能见度的影响,利用2012年秋冬季气象要素资料、颗粒物浓度及其主要成分和气溶胶粒子谱分布等观测数据,分析了南京北郊大气能见度与气象要素、颗粒物污染之间的关系.结果表明,南京北郊秋冬季节平均大气能见度仅为4.76 km.颗粒物浓度与能见度存在一定的负相关关系,尤其细粒子对能见度的影响更为显著.随细粒子质量浓度和相对湿度(RH)的增大,低能见度出现的频率呈现上升趋势.能见度从5~10 km 衰减到﹤5 km 时,PM10和 PM2.1质量浓度分别增加了7.56％和37.64％；其中 SO2-4和 NO -3质量浓度均有显著增加.气溶胶粒子数浓度对能见度的影响与相对湿度有关,粒径0.5~2μm 的气溶胶数浓度随 RH 增加增长缓慢,而2~10μm 范围内的粒子数浓度随RH 增加而减小；结合气溶胶表面积浓度与能见度进行相关性分析,表明0.5~2μm 的细粒子及相对湿度是导致南京北郊秋冬季大气能见度下降的主要因素.
Effects of Relative Humidity and Aerosol Physicochemical Properties on Atmospheric Visibility in Northern Suburb of Nanjing
To understand the effects of relative humidity (RH) and aerosol physicochemical properties on the atmospheric visibility in autumn and winter in northern suburb of Nanjing, the relationships between meteorological elements,particulate matter and visibility were analyzed with the data of meteorological elements, aerosol particle spectra, particulate matter concentration and chemical composition. The average visibility was 4. 76 km in autumn and winter in northern suburb of Nanjing. There was a certain negative correlation between the particulate matter concentration and the visibility, especially the influence of fine particles on the visibility was more remarkable. The occurrence frequencies of low visibilities showed an increasing trend with the increasing concentration of fine particles and RH. When the visibility decreased from 5-10 km to ﹤ 5 km, the mass concentrations of PM10 and PM2. 5 increased by 7. 56% and 37. 64% , respectively. Meanwhile, the mass concentrations of SO2 -4 and NO -3 increased significantly. Effects of aerosol particle number concentration on the visibility were related with RH. Aerosol number concentration with diameters ranging from 0. 5 μm to 2 μm increased slowly with the increase of RH, while those ranging from 2 μm to 10 μm decreased. The correlation analysis between the aerosol surface area concentration and the visibility showed that RH and fine particles between 0. 5 μm and 2 μm were the main factors which caused the decrease of atmospheric visibility in autumn and winter in northern suburb of Nanjing.

visibilityaerosolrelative humidityparticle spectrum distributionNanjing

于兴娜、马佳、朱彬、王红磊、严殊祺、夏航

展开 >

南京信息工程大学气象灾害预报预警与评估协同创新中心，中国气象局气溶胶-云-降水重点开放实验室，南京 210044

能见度 气溶胶 相对湿度 尺度谱 南京

中国科学院战略性先导科技专项( B 类)国家自然科学基金江苏省高等学校大学生实践创新训练计划项目江苏省高等学校大学生实践创新训练计划项目江苏省高校“青蓝工程”项目江苏高校优势学科建设工程资助项目

XDB0503010441475142201510300053y201510300065yPAPD

2015

10.13227/j.hjkx.2015.06.002

环境科学
中国科学院生态环境研究中心

环境科学

CSTPCDCSCD北大核心
影响因子：1.913
ISSN：0250-3301
年,卷(期)：2015.(6)
  • 39
  • 19