| 降水对江浙沪PM_(2.5)的清除效率研究 |
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| 引用本文： | 范凡,陆尔,葛宝珠,王自发.降水对江浙沪PM_(2.5)的清除效率研究[J].气象科学,2019,39(2):178-186. |
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| 作者姓名： | 范凡 陆尔 葛宝珠 王自发 |
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| 作者单位： | 南京信息工程大学 气象灾害省部共建教育部重点实验室, 南京 210044,南京信息工程大学 气象灾害省部共建教育部重点实验室, 南京 210044,中国科学院 大气物理研究所, 大气边界层物理和大气化学国家重点实验室, 北京 100029,中国科学院 大气物理研究所, 大气边界层物理和大气化学国家重点实验室, 北京 100029;中国科学院大学, 北京 100049 |
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| 基金项目： | 国家自然科学基金资助项目（91744206；41611540340）；国家科技支撑项目（2014BAC22B04） |
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| 摘 要： | 为了解不同程度的降水对江浙沪地区大气PM_(2.5)的清除作用,搜集了2014—2016年该地区41个城市的降水和PM_(2.5)观测数据,通过对比2 a非降水和全时段PM_(2.5)平均浓度的差异,发现前者显著高于后者,说明降水对该地区PM_(2.5)具有清除作用。利用降水前与降水期间PM_(2.5)的浓度差异作为降水对PM_(2.5)的清除率,降水后与降水期间的浓度差异作为雨后浓度回升的增加率,分别研究了目标区域不同时期、不同降雨量以及不同降雨时长对PM_(2.5)的清除效果。结果显示:(1)与江浙沪南部地区不同的是,北部地区降水清除率与降水前浓度存在正相关,降水后浓度的增加与当地的排放量呈正相关。(2)当降水量为30 mm或者降水时长为36 h时,清除率增幅减缓,说明降水对PM_(2.5)的清除效率存在着阈值。
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| 关 键 词： | PM2.5 降水 清除率 江浙沪地区 |
| 收稿时间： | 2017/11/10 0:00:00 |
| 修稿时间： | 2018/2/9 0:00:00 |
Analysis on scavenging effect of precipitation on PM2.5 in Jiangsu, Zhejiang and Shanghai area |
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| FAN Fan,LU Er,GE Baozhu and WANG Zifa.Analysis on scavenging effect of precipitation on PM2.5 in Jiangsu, Zhejiang and Shanghai area[J].Scientia Meteorologica Sinica,2019,39(2):178-186. |
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| Authors: | FAN Fan LU Er GE Baozhu and WANG Zifa |
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| Institution: | Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China,Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China,Stat Key Laboratory of Atmpspheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China and Stat Key Laboratory of Atmpspheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | To understand the scavenging effect of precipitation on PM2.5 in Jiangsu-Zhejiang-Shanghai area, the precipitation and PM2.5 observation data from 2014 to 2016 in 41 cities were analyzed. By comparing with the average concentrations of PM2.5 between non-precipitation and full-time in two years, it is found that the former was significantly higher than the latter, showing that precipitation has a scavenging effect on PM2.5 in this area. The ratio of PM2.5 concentration before and after precipitation was used as the scavenging rate, while the ratio of concentration after precipitation and precipitation was used as the increasing rate. We studied the scavenging efficiencies of PM2.5 at different periods, precipitations and precipitation durations in the target area. The results show that:(1) there is a positive correlation between scavenging ratio and pre-precipitation concentration of PM2.5 in the northern part of Jiangsu-Zhejiang-Shanghai area, and the concentration of after precipitation are positively correlated with local emissions, which are different from the southern part of Jiangsu-Zhejiang-Shanghai area. (2) When the precipitation is 30 mm or the duration of precipitation is 36 h, the increase rate of the scavenging slows down, indicating that there is a threshold value for the PM2.5 scavenging efficiency by precipitation. |
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| Keywords: | PM2 5 precipitation wet scavenging ratio Jiangsu Zhejiang and Shanghai area |
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