杭州市区相对湿度及PM2.5对能见度的影响分析

南京大学学报(自然科学版) ›› 2015, Vol. 51 ›› Issue (3): 473–.

杭州市区相对湿度及PM2.5对能见度的影响分析

杜荣光，齐冰，胡德云，李璐，俞布

出版日期:2015-04-23 发布日期:2015-04-23
作者简介:(杭州市气象局,杭州,310051)
基金资助:
国家公益性行业(气象)科研专项(GYHY201206011)，杭州市科技局社会发展科研专项(20130533B09)

The analysis of relative humidity and PM2.5 impact on visibility in Hangzhou

Du Rongguang, Qi Bing, Hu Deyun, Li Lu, Yu Bu

Online:2015-04-23 Published:2015-04-23
About author:(Hangzhou Meteorological Bureau, Hangzhou,310051,China)

摘要/Abstract

摘要： 利用杭州国家基准气候站2011～2013年的环境气象资料，对相对湿度、颗粒物质量浓度与能见度之间的对应关系进行统计分析，结果表明：杭州市区颗粒物的吸湿性增加比较明显，当相对湿度R≥80%时，相对湿度对能见度的影响十分明显，而在干霾过程中，PM2.5质量浓度对能见度的影响程度大于相对湿度对能见度的影响程度。其次是能见度与PM2.5质量浓度呈指数对应关系，RH＜80%时的相关性好于RH≥80%时的相关性；三是PM2.5浓度的减少对能见度的改善效果有不同的阶段性，PM2.5浓度从150μg·m-3降到75μg·m-3时，其质量浓度的减少对能见度的改善效果不很明显，当PM2.5质量浓度小于50μg·m-3时，能见度随PM2.5质量浓度的降低而快速上升。此外，从高时间分辨率气象资料可以反映出由于辐射冷却引起的多次雾霾转换过程中能见度变化特征具有很高的相似性。

Abstract: The relationship between atmosphericvisibility and its relevant affecting factors, such as the relative humidity (RH) and the mass concentration of particulate matterin Hangzhou from 2012 to 2013 is analyzed with statistic method in this paper.The results show that,atmospheric particlesin Hangzhou grow obviously through moisture absorption. The relative humidity (RH) has prominent effect on the visibility when itis equal to or greater than 80%, while it has less impact than that of PM2.5 concentration on the visibility when itis less than 80%, or in the dry haze process. Secondly, the massconcentration of PM2.5 matter is exponential with the visibility, and a more closed relation is found when humidity(RH) is less than 80%. Third, impact of PM2.5reduction on visibility shows differently when the PM2.5concentration is varied.That is,when the PM2.5 concentration reducesfrom 150μg·m-3to 75μg·m-3, the visibility will not be much improved, whilewhen the PM2.5 concentration reduces to the level of less than 50μg·m-3, it will be very helpful in the visibility melioration. Furthermore, the characteristics of atmospheric visibility show high?identity in fog-haze conversion caused by radiation cooling according to the high temporal resolution meteorological data

杜荣光，齐冰，胡德云，李璐，俞布
. 杭州市区相对湿度及PM2.5对能见度的影响分析
[J]. 南京大学学报(自然科学版), 2015, 51(3): 473–.

Du Rongguang, Qi Bing, Hu Deyun, Li Lu, Yu Bu. The analysis of relative humidity and PM2.5 impact on visibility in Hangzhou[J]. Journal of Nanjing University(Natural Sciences), 2015, 51(3): 473–.

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