气象2017，Vol.43Issue(12)：1527-1533,7.DOI:10.7519/j.issn.1000-0526.2017.12.008
分钟降水量对能见度及PM2.5浓度影响研究
Impact of Precipitation on Atmospheric Visibility and the PM2.5 Concentration Based on the Minute-Scale High-Resolution Observations
摘要
Abstract
To explicitly investigate the influence of precipitation on visibility and PM2.5 concentration,minute-scale observations of Hangzhou during 2014-2015 are used to comparatively analyze the distribution characteristics of visibility and PM2.5 concentration under different levels of precipitation,and,furthermore,the quantitative impacts of precipitation with different intensities on visibility and PM2.5 concentration are studied.The results indicate that the intensity and duration of precipitation can significantly modulate visibility and PM2.5 concentration.Consistent and stable rainfall are easy to trigger long low-visibility scenario,and the sudden heavy precipitation is an important factor inducing the sharp-decrease of visibility.With the rise of rainfall,the visibility changes from rapid-decline to slow-decline and there exists an inflection point.The removing effect of precipitation on PM2.5 concentration can be mediated by the intensity of rainfall and the PM2.5 concentration before raining.When there is modest/small rainfall,the removing effect usually occurs several time later.However,heavy precipitation is able to remove PM2.5 quickly.Basically,synchronous changes among precipitation,PM2.5 concentration and visibility can appear.Based on the two factors of precipitation intensity and PM2.5 concentration before raining,a quantitative statistical model reflecting the influence of rainfall on PM2.5 concentration is constructed with the non-linear fitting technology,and the modeling results agree well with observations.Finally,the existing limitations and some scientific issues which need further exploring in the future are discussed.关键词
降水/大气能见度/PM2.5/非线性拟合Key words
precipitation/atmospheric visibility/PM2.5/non-linear fitting分类
天文与地球科学引用本文复制引用
樊高峰,马浩,任律,肖晶晶..分钟降水量对能见度及PM2.5浓度影响研究[J].气象,2017,43(12):1527-1533,7.基金项目
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)和浙江省科技厅重点项目(2014C23004)共同资助 （LQ14D050001）
