摘要
基于高密度逐时气象观测资料以及国家环境保护部公布的空气质量日报,对绵阳城区2014年1月9日至2月4日一次污染过程的气象条件,分3种类型(轻度污染型、中度污染型、重度污染型)进行研究。结果表明:整个过程风速和混合层厚度与空气质量指数均呈负相关,相关系数为-0.637、-0.487;分类型讨论时,仅轻度污染型风速与空气质量指数呈负相关,相关系数为-0.739;风速日变化均呈现"单峰型"的特征,峰值出现在12:00—18:00之间;风向以东南、西北气流为主,东南气流能加重空气污染;混合层厚度表现为"早晚低,午后高"的日变化特征,轻度型的混合层厚度平均高583.78m,中度型反比重度型低6m,分别为481.92m,487.69m;溃变理论V-3θ图对连续重污染过程的转折性天气起到较好的预报和指示作用,主要表现在强对流和降水天气两类。
Based on the hourly high-density meteorological observation data and the Air Quality Index announced by the Ministry of Environmental Protection of China, we discuss and analyze the meteorological conditions of the pollution process from January 9 to 4 February 2014 in the urban area of Mianyang,Sichuan Province.This study is conducted from three aspects：slight,moderate,and severe pollution.Analysis indicates that the wind speed and the thickness of the atmospheric mixed layer are negatively correlated with the air quality index,with the correlation coefficients being -0.637 and -0.487.The types of air pollution are discussed.The wind speed is negatively correlated with the air quality index in slight pollution with a correlation coefficient of -0.739.The diurnal variation of wind speed shows a single-peak trend,with the peak value appearing in 12：00-18：00.The wind direction is given priority to the southeast and northwest flow,and the air pollution could be aggravated by the southeast flow.The thickness of the atmospheric mixed layer in the slight pollution condition is 583.78 m,and it is 5 m lower in moderate pollution than in severe pollution,481.92 mand 487.69 m,respectively.While the thickness of the atmospheric mixed layer on the low side,the diurnal variation is characterized as low in the morning and evening,high in the afternoon.According to the Blown-up Theory,the V-3θ plot of the pollution process has instructive effect in forecasting strong convection and precipitation.
作者
杜筱筱
马力
Du Xiaoxiao Ma Li(School of Atmospheric Science, Chengdu University of Information Technology, Plateau Atmospheric and Environment Key Laboratory of Sichuan Province, Chengdu 610225 Sichuan Meteorological Bureau, Chengdu 610072)
出处
《气象科技》
北大核心
2017年第4期717-724,共8页
Meteorological Science and Technology
关键词
污染特征
风速
混合层厚度
溃变理论
pollution characteristic
wind speed
thickness of atmospheric mixed layer
＂blown-up＂ theory
