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河谷地形气象要素对污染物浓度影响的研究
杨雪玲,王颖,李博,张稼轩,赖锡柳,等
作者单位E-mail
杨雪玲 兰州大学大气科学学院,甘肃 兰州 yangxl11@lzu.edu.cn 
王颖 兰州大学大气科学学院,甘肃 兰州  
李博 兰州大学大气科学学院,甘肃 兰州  
张稼轩 兰州大学大气科学学院,甘肃 兰州  
赖锡柳 兰州大学大气科学学院,甘肃 兰州  
摘要:
气象条件对环境空气质量影响的研究是科学制定大气环境污染防控方案、及时发布重污染天气应急预警的基础。利用兰州市西固区环境空气质量监测点2015年主要污染物小时浓度监测值,分析了污染物浓度的季节变化和日变化特征,结合同期观测的气温、风速、相对湿度和降水量等气象资料,探讨了气象要素对污染物浓度变化的影响。结果表明,河谷地形气温和风速是影响污染物扩散的重要气象因子。①除ρ(O3)外,其他污染物质量浓度呈“冬高夏低”、“早晚高下午低”的变化特点,这与表征污染物扩散能力的边界层参数变化特征一致。②ρ(O3)春季为71.42μg/m3,夏季为62.74μg/m3,ρ(O3)春季高于夏季的主要原因是O3的前体物NOx春季质量浓度高于夏季且春季扩散条件弱于夏季。③除ρ(O3)外,其他污染物质量浓度与气温、风速呈负相关。④当相对湿度<40%时,污染物质量浓度与相对湿度呈正相关;当相对湿度>80%时,污染物质量浓度与相对湿度呈负相关;降雨对不同污染物的清除效果不同。
关键词:  西固区  大气污染物  浓度分布  气象要素
DOI:
分类号:
基金项目:国家自然科学基金项目(41205007)
Study on the influence of meteorological elements on pollutant concentration in river valley terrain
yangxueling,et al
Abstract:
The effect of meteorological elements on ambient air pollutants concentrations play a crucial role in planning air pollution control strategies, and preventing or responding quickly to air quality deterioration. In this study, One-year series of hourly average air pollutant concentration observations at a monitoring stations located in Xigu district of Lanzhou City, was analyzed to gain seasonal and diurnal variation of pollutant concentrations, furthermore, meteorological factors, such as wind speed, temperature, relative humidity, and precipitation at the same station are deployed to evaluate the relationship of meteorological elements and pollutant concentration. The result shows that air temperature and wind speed are play an important role in pollutant concentrations over river valley terrain: ①Except ρ(O3),other pollutants demonstrate the features of " higher concentration in winter than in summer" and " higher concentration in the morning and in the evening than in the afternoon", which is consistent with seasonal and diurnal variation of boundary layer parameters indicating the pollutant diffusion capacity. ②Ozone concentration is 71.42μg/m3 in spring and 62.74μg/m3 in summer, ozone's precursor (NOx) concentration is higher and diffusion condition is disadvantage in spring than in summer which leads to O3 higher concentration in spring. ③Except ρ(O3), the other pollutants were negatively correlated to air temperature and wind speed. ④When the relative humidity <40%, the pollutant concentration positively correlated to the relative humidity, while the pollutant mass concentration shows negatively correlated to the relative humidity when the relative humidity>80%, Rainfall shows different removal depends on the type of pollution.
Key words:  Xigu district  air pollutants  concentration distribution  meteorological elements