| 基于卫星和地面监测的河西走廊O3浓度时空分布及潜在源区分析 |
| 摘要点击 4022 全文点击 1042 投稿时间：2022-09-06 修订日期：2022-12-04 |
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| 中文关键词 O3 河西走廊 时空分布 后向轨迹 潜在源区 |
| 英文关键词 O3 Hexi Corridor spatiotemporal distribution backward trajectory potential source area |
| DOI 10.13227/j.hjkx.20230902 |
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| 中文摘要 |
| 基于2005~2020年OMI遥感卫星O3柱浓度数据，结合河西走廊地区10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，利用克里金插值法、相关性分析和后向轨迹（HYSPLIT）模型，探讨河西走廊近地面O3时空分布特征、气象因素、传输路径和潜在来源.结果表明：①从时间变化来看，O3柱浓度在2005~2010年和2014~2020年呈上升趋势，2010~2014年呈下降趋势，2010年和2014年分别达到最大值和最小值，分别为332.31 DU和301.00 DU，季节变化表现为春季和冬季明显大于夏季和秋季.②在空间分布上，O3柱浓度大体呈现由西南向东北递增的纬向带状分布特征，高值区主要分布在地势低平的城市区域，中值区呈纬向带状与祁连山山麓走向基本一致.③气象条件分析发现，温度、风速和日照时数与O3呈现正相关，相对湿度与O3呈现负相关.④通过对武威市模拟受点气流输送轨迹发现，O3输送路径方向较为单一，各季节的主导气流均以西部和西北部为主，所占比例分别为71.62%、66.85%、61.22%和77.78%；O3潜在贡献源区存在一定的季节差异：春季、夏季和秋季的O3潜在源高值区域均分布于白银市和兰州市等地，为东南风源，冬季高值区分布于巴丹吉林沙漠和腾格里沙漠之间，为北风源. |
| 英文摘要 |
| Based on 2005-2020 O3 column concentration data of OMI remote sensing satellite, combined with air pollutant data from 10 nationally controlled environmental automatic monitoring stations in the Hexi Corridor and global data assimilation system meteorological data, we used Kriging interpolation, correlation analysis, and backward trajectory (HYSPLIT) models to explore the temporal and spatial distribution characteristics, meteorological factors, transmission paths, and potential sources of O3 in the Hexi Corridor. The results showed the following:① in terms of temporal distribution, O3 column concentration showed an upward trend in 2005-2010 and 2014-2020 and downward trend in 2010-2014; the maximum and minimum values were reached in 2010 and 2014 (332.31 DU and 301.00 DU), respectively, and seasonal changes showed that those in spring and winter were significantly higher than those in summer and autumn. ② In terms of spatial distribution, O3 column concentration showed a latitudinal band distribution characteristic of increasing from southwest to northeast; the high-value areas were primarily distributed in urban areas with low terrain, and the median zone was latitudinally striped with the basic alignment of the Qilian foothills. ③ The analysis of meteorological conditions revealed that temperature, wind speed, and sunshine hours were positively correlated with O3, and relative humidity was negatively correlated with O3. ④ By simulating the airflow transportation trajectory of the receiving point in Wuwei City, it was found that the direction of the O3 conveying path was relatively singular; the dominant airflow in each season was primarily in the west and northwest; and the proportions were 71.62%, 66.85%, 61.22%, and 77.78%, respectively. There were certain seasonal differences in the source areas of O3 potential contribution:the high-value areas of O3 potential sources in spring, summer, and autumn were distributed in Baiyin City and Lanzhou City, which were southeast wind sources, and the high-value areas in winter were distributed between the Badain Jaran Desert and the Tengger Desert, which was the north wind source. |
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