| 基于旋翼无人机观测的雾天和霾天VOCs垂直分布特征研究 |
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| 引用本文： | 刘若岚,刘端阳,袁淑杰,祖繁,吴泓,刘瑞翔.基于旋翼无人机观测的雾天和霾天VOCs垂直分布特征研究[J].大气科学学报,2023,46(5):655-666. |
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| 作者姓名： | 刘若岚 刘端阳 袁淑杰 祖繁 吴泓 刘瑞翔 |
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| 作者单位： | 成都信息工程大学 大气科学学院, 四川 成都 610225;南京气象科技创新研究院 中国气象局交通气象重点开放实验室, 江苏 南京 210041;南京气象科技创新研究院 中国气象局交通气象重点开放实验室, 江苏 南京 210041;中国气象科学研究院 灾害天气重点实验室, 北京 100081;南京气象科技创新研究院 中国气象局交通气象重点开放实验室, 江苏 南京 210041;连云港市气象局, 江苏 连云港 222000 |
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| 基金项目： | 国家自然科学基金资助项目(42075063;42075066);灾害天气国家重点实验室开放课题(2021LASW-A07) |
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| 摘 要： | 为研究雾和霾天气下VOCs时空变化特征,于2020年11月19 日—2021年1月15日在江苏省东海国家气象观测站进行为期58 d的外场观测试验。利用自主研发的多旋翼无人机捕获2次辐射雾和2次霾天气过程,获得气温、气压、相对湿度、风向、风速、VOCs、O3等7种要素100多条垂直廓线。结果表明:时间上,霾过程夜间VOCs体积浓度(0.225~0.253 ppm(parts per million, 1 ppm=10-6))明显高于白天(0.191~0.205 ppm),雾形成前体积浓度(0.121~0.239 ppm)显著高于雾过程(0.056~0.209 ppm)。雾过程中VOCs体积浓度与雾强度变化相反,雾层高度与VOCs体积浓度剧烈变化高度一致,雾层(<200 m)中VOCs体积浓度(0.172~0.178 ppm)明显减小,显著低于雾形成前(0.195~0.240 ppm),雾层以上浓度变化大,雾结束后1 h内保持雾过程中分布特点。雾对逆温层中的水溶性污染物有清除作用,VOCs体积浓度和O3质量浓度均下降。
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| 关 键 词： | 雾 霾 挥发性有机物(VOCs) 湿清除作用 大气边界层 无人机(UAV)观测 |
| 收稿时间： | 2023/2/12 0:00:00 |
| 修稿时间： | 2023/4/3 0:00:00 |
Vertical characteristics of VOCs during fog and haze events in the lower troposphere over eastern China:insights from multi-rotor UAV observations |
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| LIU Ruolan,LIU Duanyang,YUAN Shujie,ZU Fan,WU Hong,LIU Ruixiang.Vertical characteristics of VOCs during fog and haze events in the lower troposphere over eastern China:insights from multi-rotor UAV observations[J].大气科学学报,2023,46(5):655-666. |
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| Authors: | LIU Ruolan LIU Duanyang YUAN Shujie ZU Fan WU Hong LIU Ruixiang |
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| Institution: | School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China;Key Laboratory of Transportation Meteorology of China Meteorological Administration, Nanjing Joint Institute for Atmospheric Sciences, Nanjing 210041, China;Key Laboratory of Transportation Meteorology of China Meteorological Administration, Nanjing Joint Institute for Atmospheric Sciences, Nanjing 210041, China;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China; Key Laboratory of Transportation Meteorology of China Meteorological Administration, Nanjing Joint Institute for Atmospheric Sciences, Nanjing 210041, China;Lianyungang Meteorological Bureau of Jiangsu Province, Lianyungang 222000, China |
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| Abstract: | To investigate the temporal and spatial variation characteristics of VOCs during fog and haze events,a comprehensive 58-day field observation experiment was conducted at the Donghai National Meteorological Observing Station in Jiangsu Province from November 19,2020,to January 15,2021.This study utilized a self-developed multi-rotor UAV observation system to observe two radiation fog events and two haze events,resulting in over 100 atmospheric boundary layer profiles,including air temperature,pressure,relative humidity (RH),wind direction,wind speed,VOCs,and O3.The results show the following:In terms of time,the volume concentration of VOCs during nighttime in the haze process (0.225-0.253 ppm) (parts per million,ppm;1 ppm=10-6) was significantly higher than during the daytime (0.191-0.205 ppm).Moreover,the volume concentration before fog formation (0.121-0.239 ppm) was significantly higher than during the fog process (0.056-0.209 ppm).During the fog process,VOCs'' volume concentration exhibited an opposite trend to fog intensity.The height of the fog layer closely correlated with the sharp change in VOCs'' volume concentration.In the fog layer (below 200 m),the VOC volume concentration (0.172-0.178 ppm) significantly decreased,being notably lower than pre-fog events (0.195-0.240 ppm).Above the fog layer (200-700 m),VOCs'' volume concentrations underwent significant changes,which persisted for up to 1hour after fog dissipation.The stable high-humidity environment within the fog layer had a scavenging effect on water-soluble pollutants trapped within the temperature inversion layer,resulting in decreased concentrations of VOCs and O3. |
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| Keywords: | fog haze VOCs wet scavenging effect atmospheric boundary layer UAV observation |
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