| 降水和风对泰安地区PM2.5浓度的影响及区域传输研究 |
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| 引用本文： | 栾兆鹏,卢慧超,李恬,崔向前,赵天良,朱庆瑞.降水和风对泰安地区PM2.5浓度的影响及区域传输研究[J].气象与环境学报,2021,37(3):33-39. |
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| 作者姓名： | 栾兆鹏 卢慧超 李恬 崔向前 赵天良 朱庆瑞 |
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| 作者单位： | 1. 泰安市气象局, 山东 泰安 2710002. 济南市气象局, 山东 济南 2501023. 东平县气象局, 山东 东平 2715004. 南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏 南京 2100445. 中国气象局气溶胶-云-降水重点开放实验室, 江苏 南京 210044 |
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| 基金项目： | 国家自然科学基金(41830965);国家自然科学基金(91744209);山东省气象局预报员专项(SDYBY2017-12);山东省气象局预报员专项(SDYBY2019-12) |
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| 摘 要： | 利用泰安市2018—2019年降水、风和PM2.5逐小时观测数据，分析了降水和风对PM2.5浓度的影响，并对PM2.5进行了源解析。结果表明：降水对PM2.5有一定清除作用，降雨日PM2.5平均质量浓度较非降雨日平均降低约7.2%，秋冬季节最为显著。降水对PM2.5的清除率与降水强度、降水前PM2.5初始浓度及降水时间均有关。当降水强度大于4 mm·h-1时，清除率多在40%以上；当降水强度小于2 mm·h-1、初始浓度低于75 μg·m-3或降水强度小于1 mm·h-1、初始浓度在75—100 μg·m-3范围，且降水持续时间在5 h以内时容易出现PM2.5浓度反弹现象。不同风向风速对泰安地区霾粒子清除也有明显差异，西南偏西风和东北偏东风更容易造成泰安地区霾污染，重污染期间风速超过5 m·s-1偏南风和风速超过3 m·s-1偏北风均对污染物具有有效清除作用。而区域风场相关矢结果表明重污染期间PM2.5污染物主要从广西—湖南—江西一带、安徽南部及浙江北部在西南气流引导下传输至泰安地区，本地源贡献则较少。
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| 关 键 词： | PM2.5 降水 风 清除率 排放源 |
| 收稿时间： | 2020-05-08 |
Impacts of precipitation and wind on PM2.5 concentration and its region transport in Tai'an |
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| Zhao-peng LUAN,Hui-chao LU,Tian LI,Xiang-qian CUI,Tian-liang ZHAO,Qing-rui ZHU.Impacts of precipitation and wind on PM2.5 concentration and its region transport in Tai'an[J].Journal of Meteorology and Environment,2021,37(3):33-39. |
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| Authors: | Zhao-peng LUAN Hui-chao LU Tian LI Xiang-qian CUI Tian-liang ZHAO Qing-rui ZHU |
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| Institution: | 1. Tai'an Meteorological Service, Tai'an 271000, China2. Ji'nan Meteorological Service, Ji'nan 250102, China3. Dongping County Meteorological Service, Dongping 271500, China4. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China5. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing 210044, China |
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| Abstract: | Using the hourly observation data of precipitation, wind, and PM2.5 in Tai'an from 2018 to 2019, the impacts of precipitation and wind on PM2.5 concentration as well as the source of PM2.5 were analyzed.The results showed that precipitation has a certain scavenging effect on PM2.5.The average mass concentration of PM2.5 on rainy days is about 7.2% lower than that on non-rainy days, especially in autumn and winter.The scavenging rate of PM2.5 by precipitation is related to precipitation intensity, initial PM2.5 concentration before precipitation, and precipitation duration.The scavenging rate of PM2.5 is higher than 40% when the precipitation intensity is greater than 4 mm·h-1.The PM2.5 concentration tends to rebound under conditions of precipitation intensity < 2 mm·h-1, or the initial PM2.5 concentration < 75 μg·m-3 and precipitation intensity < 1 mm·h-1, or the initial PM2.5 concentration within the range of 75-100 μg·m-3 and precipitation duration < 5 h.Different wind directions and wind speeds show different impacts on the scavenging of haze particles in Tai'an.The west-southwesterly wind and the east-northeasterly wind are more likely to cause haze pollution in the Tai'an area.During heavy pollution, the southerly winds > 5 m·s-1 and the northerly winds > 3 m·s-1 can effectively remove pollutants.PM2.5 is mainly transported from Guangxi-Hu'nan-Jiangxi provinces, southern Anhui province, and northern Zhejiang province to Tai'an by southwesterly airflows, and less contribution is from the local emissions. |
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| Keywords: | PM2 5 Precipitation Wind Scavenging rate Emission source |
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