| 西安市一次霾过程中气溶胶垂直分布特征及气象要素影响 |
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| 引用本文： | 王潇,曹念文,黄婧婷,王贺,周杰,郑凯端.西安市一次霾过程中气溶胶垂直分布特征及气象要素影响[J].环境科学研究,2018,31(9):1519-1526. |
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| 作者姓名： | 王潇 曹念文 黄婧婷 王贺 周杰 郑凯端 |
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| 作者单位： | 1.南京信息工程大学, 气象灾害教育部重点实验室, 气候与环境变化国际合作联合实验室, 气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶与云降水重点开放实验室, 江苏 南京 210044 |
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| 基金项目： | 国家重点研发计划专项（No.2017YFC0209603）；国家自然科学基金项目（No.41375044） |
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| 摘 要： | 为探讨西安市典型霾过程中的气溶胶垂直分布特征和气象要素影响，利用地面空气质量数据、CALIPSO卫星激光雷达资料以及气象要素资料，并结合HYSPLIT后向轨迹模式、天气形势分析、相关性分析等，对西安市2016年12月17-21日霾过程依据RH（相对湿度）进行干霾、湿霾和雾霾的划分，并分析不同阶段的气溶胶垂直分布特征.结果表明:前期干霾阶段，西北沙尘的输送使得高空气溶胶退偏比和色比较大，以沙尘型气溶胶为主；中期湿霾阶段，RH的增大使得低层细粒子增多，消光系数达1.7 km-1，以污染型气溶胶为主；后期干霾阶段时，低层大气中非球形粗粒子增多，以混合型气溶胶占主导.气象要素对霾过程影响较大，静风、高湿、"双逆温"效应不利于颗粒物的清除，逆温强度的变化与污染物的消长具有一定的滞后一致性.RH和ρ（PM）共同影响能见度变化，RH高于80%时，能见度由RH主导，相关系数达到-0.871；RH低于80%的污染阶段，ρ（PM）对能见度起主导作用，相关系数达0.85以上.研究显示，不同霾阶段气溶胶垂直分布特征差异较大，气象要素对霾过程的消长有重要影响.
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| 关 键 词： | 霾 CALIPSO 气溶胶 气象要素 |
| 收稿时间： | 2017/11/6 0:00:00 |
| 修稿时间： | 2018/5/16 0:00:00 |
Vertical Distribution of Aerosol and Meteorological Elements during a Haze Episode in Xi'an City |
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| WANG Xiao,CAO Nianwen,HUANG Jingting,WANG He,ZHOU Jie and ZHENG Kaiduan.Vertical Distribution of Aerosol and Meteorological Elements during a Haze Episode in Xi'an City[J].Research of Environmental Sciences,2018,31(9):1519-1526. |
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| Authors: | WANG Xiao CAO Nianwen HUANG Jingting WANG He ZHOU Jie and ZHENG Kaiduan |
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| Affiliation: | 1.Key Laboratory of Meteorological Disaster, Ministry of Education, Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China2.School of Geography & Remote Sensing, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: | In order to explore the characteristics of aerosol vertical distribution and the influence of meteorological elements in typical haze processes in Xi''an City, the ground air quality, CALIPSO satellite and meteorological data and the HYSPLIT backward trajectory model, synoptic situation analysis and correlation analysis were used in this study. Based on the relative humidity (RH), the haze episode of Xi''an City from December 17th to 21st was divided into dry haze, wet haze and fog-haze, and the vertical distribution characteristics of aerosol at different stages were analyzed. The study showed that in addition to the dust transported from the northwest region, dust aerosols with large depolarization ratio and color ratio played a dominant role in the early dry haze stage. More fine particles were generated by the increasing RH in wet haze in the middle stage, when the extinction coefficient reached 1.7 km-1, and the pollution aerosols played the dominant role instead. Then, mixtures of pollutants and dust were observed and coarse particles accumulated close to the ground when RH decreased in the later dry haze stage. Breeze, high humidity and double temperature inversion combined to increase pollutants, and the change in the temperature inversion intensity had a certain lag consistency with the growth and decline of pollutants. The visibility was dominated by relative humidity when RH was higher than 80%, with a correlation coefficient reaching -0.871. The particle concentration played a leading role when the RH was lower than 80%, and the correlation coefficient was more than 0.85. Besides, the vertical distribution characteristics of aerosol in different haze stages were quite different, and meteorological factors had an important influence on the haze process. |
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| Keywords: | haze CALIPSO aerosol meteorological elements |
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