引用本文:杨雪玲,王颖,李博,张稼轩,赖锡柳,等.河谷地形气象要素对污染物浓度的影响[J].环境科学研究,2018,31(1):34-41.
YANG Xueling,WANG Ying,LI Bo,ZHANG Jiaxuan,LAI Xiliu,et al.Influence of Meteorological Elements on Pollutant Concentration in River Valley Terrain[J].Reserrch of Environmental Science,2018,31(1):34-41.]
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河谷地形气象要素对污染物浓度的影响
杨雪玲1, 王颖1,2, 李博1, 张稼轩1, 赖锡柳1,3
1. 兰州大学大气科学学院, 甘肃 兰州 73000;2. 兰州大学半干旱气候变化教育部重点实验室, 甘肃 兰州 730000;3. 柳州市气象局, 广西 柳州 545001
摘要:
气象条件对环境空气质量影响的研究是科学制订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性变化和日变化特征,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:①除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71.42 μg/m3,夏季为62.74 μg/m3,春季高于夏季的主要原因是春季O3的前体物NOx质量浓度高于夏季且春季扩散条件弱于夏季.③除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.研究显示,河谷地形气温和风速是影响污染物扩散的重要气象因子.
关键词:  西固区  大气污染物  质量浓度分布  气象要素
DOI:10.13198/j.issn.1001-6929.2017.03.25
分类号:X51
基金项目:国家自然科学基金项目(41205077)
Influence of Meteorological Elements on Pollutant Concentration in River Valley Terrain
YANG Xueling1, WANG Ying1,2, LI Bo1, ZHANG Jiaxuan1, LAI Xiliu1,3
1. Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;2. Key Laboratory of Semi-Arid Climate Change, Ministry of Education, Lanzhou University, Lanzhou 730000, China;3. Liuzhou Meteorogical Butean, Liuzhou 545001, China
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. 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 employed to evaluate the relationship of meteorological elements and pollutant concentration. The result shows: (1) Except 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. (2) Ozone concentration is 71.42 μg/m3 in spring and 62.74 μg/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. (3) Except ρ(O3), the other pollutants were negatively correlated to air temperature and wind speed. (4) When the relative humidity < 40%, the pollutant concentration positively correlated to the relative humidity, while the pollutant mass concentration was 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