气象学报2016，Vol.74Issue(6)：959-973,15.
相对湿度和 PM2．5浓度对大气能见度的影响研究：基于小时资料的多站对比分析
Impacts of relative humidity and PM2.5 concentration on atmospheric vis-ibility:A comparative study of hourly observations of multiple stations
摘要
Abstract
To comprehensively investigate fundamental characteristics and associated influencing mechanisms in different re-gions of Zhejiang province,based on hourly visibility data during 2013 - 2014 at Hangzhou station,Ningbo station and Wenzhou station,comparative analysis is conducted to study visibility variability at different time-scales for the three cities.It is found that the occurrence frequency of different visibility levels for the three cities are broadly consistent;with the rise of vis-ibility level,the occurrence frequency gradually decreases.Besides,the visibility displays significant diurnal cycle.There are two low-visibility periods during the year,i.e.December to February and May to June.Generally speaking,the visibility in Ningbo is better while those in Hangzhou and Wenzhou are similar.Power spectrum analysis indicates that visibility in the three cities exhibits significant diurnal periodicity;many distinct peaks occur in the high-frequency range,and some peaks are also prominent in the low-frequency band.Further studies have been carried out to investigate the mechanism responsible for the change in visibility.Relative humidity and PM2.5 concentration are critically important and can effectively influence visibili-ty.Increases in relative humidity and PM2.5 concentration can lead to the decline of visibility.At the same relative humidity lev-el,the visibility drops rapidly in the beginning but decreases much slower after the"point of inflection".At the same level of PM2.5 concentration,the visibility gradually falls with the elevation of the relative humidity,which proves the importance of water vapor.Using the relative humidity and PM2.5 concentration as the impact factors,a quantitative statistical-model is con-structed with nonlinear fitting scheme.It is demonstrated that the fitting result is pretty good.Finally,some existing problems and valuable scientific issues are discussed.关键词
大气能见度/相对湿度/PM2.5 浓度/非线性拟合/统计模型Key words
Atmospheric visibility/Relative humidity/PM2.5 concentration/Nonlinear fitting/Statistical model分类
天文与地球科学引用本文复制引用
樊高峰,马浩,张小伟,刘樱..相对湿度和 PM2．5浓度对大气能见度的影响研究：基于小时资料的多站对比分析[J].气象学报,2016,74(6):959-973,15.基金项目
资助课题浙江省自然科学基金项目（LQ14D050001）、中国气象局预报预测核心业务发展专项（CMAHX20160703）、浙江省科技重点项目（2014C23004）。 （）
