天津大气能见度与相对湿度和PM_(10)及PM_(2.5)的关系  

Relationship between visibility and relative humidity,PM_(10),PM_(2.5) in Tianjin

作　　者：宋明[1,2] 韩素芹[2] 张敏[2] 姚青[2,3] 朱彬[4] 

机构地区：[1]兰州大学大气科学学院,甘肃兰州730000 [2]天津市气象局,天津300074 [3]中国气象局云雾物理环境重点开放实验室,北京100081 [4]南京信息工程大学中国气象局大气物理与大气环境重点开放实验室,江苏南京210044

出　　处：《气象与环境学报》2013年第2期34-41,共8页Journal of Meteorology and Environment

基　　金：天津市气象局科研课题(201210);公益性行业(气象)科研专项(GYHY201006011);公益性行业(气象)科研专项(GYHY200806027);中国气象局云雾物理环境重点开放研究室开放课题(2009011)共同资助

摘　　要：为研究大气气溶胶及空气中水汽与大气能见度下降的关系,利用2009年天津大气边界层观测站大气能见度资料和同期观测的相对湿度、PM10及PM2.5资料,对三者与大气能见度的关系进行分析。结果表明:大气能见度与相对湿度线性相关系数最高,PM2.5次之;大气能见度随相对湿度的增大而明显降低。相对湿度低于60%时,大气能见度与PM2.5的非线性相关性较好,与PM10次之,与PM10和PM2.5差值的相关性最差。相对湿度高于60%时,大气能见度与PM10的非线性相关性较好,与PM2.5相关性次之。大气能见度与相对湿度非线性相关系数高于线性相关系数。利用相对湿度、PM10及PM2.5数据计算得到了具有季节变化的非线性大气能见度拟合公式,经验证,该公式能较好地模拟天津地区的大气能见度。Based on the visibility data in 2009 and relative humidity （RH）, concentrations of PMI0 and PM2.5 in Tianjin,their relationships were analyzed. The results indicate that the linear correlation coefficient between RH and visibility is the highest and that between PMz 5 concentration and visibility ranks second. The visibility decreases obviously with the increase of RH. When RH is less than 60% ,there exists a significant nonlinear correlation be- tween the visibility and PMz 5 concentration and a weak correlation between the visibility and PM10 concentration, while the correlation between the visibility and the concentration difference between PM10 and PM2.5 is not signifi- cant. When RH is greater than 60%, the nonlinear correlation between the visibility and PM10 concentration is more significant than that between the visibility and PM2. 5 concentration. The nonlinear correlation efficient between the visibility and RH is higher than their corresponding linear correlation efficient. Finally, a nonlinear fitting formula of visibility in Tianjin is developed using RH, PM10 and PMz 5. It has been shown through examination against the observation that this formula is able to simulate the visibility in Tianjin with a relatively good accuracy.

关 键 词：大气能见度 PM10 PM2 5相对湿度 非线性相关 

分 类 号：P427.21[天文地球—大气科学及气象学]