研究报告
肖仕锐,刘旻霞,李乐,米佳乐,王思远.河套平原O3浓度时空分布、传输路径及潜在源贡献分析[J].环境科学学报,2022,42(6):237-249
河套平原O3浓度时空分布、传输路径及潜在源贡献分析
- Temporal and spatial distribution， transmission path and potential source contribution of O3 concentration in Hetao Plain
- 基金项目：国家自然科学基金项目（No.31760135）；甘肃省自然科学基金（No.20JR10RA089）
- 作者
- 单位
- 肖仕锐
- 西北师范大学地理与环境科学学院，兰州 730070
- 刘旻霞
- 西北师范大学地理与环境科学学院，兰州 730070
- 李乐
- 西北师范大学地理与环境科学学院，兰州 730070
- 米佳乐
- 西北师范大学地理与环境科学学院，兰州 730070
- 王思远
- 西北师范大学地理与环境科学学院，兰州 730070
- 摘要：基于2005—2020年OMI遥感卫星O3柱浓度数据，结合河套平原23个国控点环境自动监测站大气污染物数据和全球资料同化系统（GDAS）气象资料，探讨河套平原O3污染时空分布特征、气象因素、传输路径和潜在来源.结果表明：①2005—2020年河套平原O3柱浓度年均值波动上升，年均增长率为2.95%，季节变化表现为春季>冬季>夏季>秋季；②空间分布方面：高值区主要分布在东北部地区，南部城市低于北部城市；③河套平原地区O3浓度与气温、日照呈显著正相关，与气压呈显著负相关，而降水、相对湿度、风速对O3浓度影响具有显著的区域性差异；④基于后向轨迹HYSPLIT模型对河套平原地区污染严重城市鄂尔多斯市进行分析，发现远距离气流传输主要来自西北方向，近距离气流传输主要来自西南方向；O3主要潜在贡献源区存在一定的季节差异：春季主要来自陕西北部与包头市，夏季主要来自陕西北部与山西西部，秋季主要来自内蒙古西部与宁夏银川市、陕西北部，而冬季则主要来自内蒙古西北部.陕西北部、黄土高原、内蒙古西部沙漠、鄂尔多斯周边城市群是潜在污染源区的集中区域，对鄂尔多斯市O3污染贡献较大.
- Abstract：Based on the O3 column concentration data of OMI remote sensing satellite from 2005 to 2020， combined with the air pollutant data of 23 environmental monitoring stations and the meteorological data of global data assimilation system （GDAS）， the temporal and spatial distribution characteristics， meteorological factors， transmission path and potential sources of O3 pollution in Hetao Plain are discussed. The results show that： ① the annual average concentration of O3 column fluctuates and increases from 2005 to 2020， with an average annual growth rate of 2.95%. The seasonal variation is spring > winter > summer > autumn； ② Spatial distribution： high value areas are mainly distributed in the northeast， and the southern cities are lower than the northern cities； ③ O3 concentration has a significant positive correlation with air temperature and sunshine， and a significant negative correlation with air pressure， while the effects of precipitation， relative humidity and wind speed on O3 concentration have significant regional differences； ④ Based on the backward trajectory hysplit （HYSPLIT） model， it is found that the long-distance air flow transmission mainly comes from the northwest and the short-distance air flow transmission mainly comes from the southwest； There are some seasonal differences in the main potential contribution source areas of O3： in spring， it mainly comes from northern Shaanxi and Baotou city， in summer， it mainly comes from northern Shaanxi and western Shanxi， in autumn， it mainly comes from western Inner Mongolia， Yinchuan city and northern Shaanxi， while in winter， it mainly comes from northwestern Inner Mongolia. Northern Shaanxi， Loess Plateau， western desert of Inner Mongolia and urban agglomeration around Ordos are potential pollution source areas， which make a great contribution to O3 pollution in Ordos.
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