中文关键词
京津冀及周边MAIAC AODPM2.5时空分布相关性 | 英文关键词Beijing-Tianjin-Hebei and surrounding areasMAIAC AODPM2.5temporal and spatial distributioncorrelation |
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| 中文摘要 |
| 基于2014~2018年京津冀及周边地区MAIAC AOD和PM2.5质量浓度数据，探讨AOD和PM2.5质量浓度的时空差异，并利用线性回归探讨两者之间的相关性.结果表明，PM2.5日均浓度超标天数分别占33%和57%（执行世界卫生组织IT.1和IT.2日均标准值），污染较为严重.Terra、Aqua MAIAC AOD和PM2.5年均浓度均呈下降趋势，PM2.5浓度呈现出冬春季高、夏秋季低的特点，而Terra、Aqua AOD则表现为春夏季高、秋冬季低.PM2.5及AOD的季均和年均浓度均呈现"北低南高"的区域分布特征，高值区主要位于河北南部、山西南部、山东西部以及河南北部，低值区主要位于山西北部、河北北部以及山东东部.PM2.5年均浓度介于27~99μg·m-3，AOD年均值介于0.20~0.69.Aqua AOD与PM2.5浓度的相关性更高，且不同季节Terra、Aqua AOD与PM2.5相关性差异显著，总体均表现为春冬季良好，夏秋季相对较差.对卫星AOD进行垂直和湿度订正后，其与PM2.5的相关性显著提高. |
| 英文摘要 |
| Based on the MAIAC AOD and PM2.5 mass concentration data for the Beijing-Tianjin-Hebei region and surrounding areas from 2014 to 2018, the temporal and spatial differences in Aerosol Optical Depth (AOD) and PM2.5 mass concentrations were explored and their correlation was analyzed by linear regression. The results show that the daily average concentration of PM2.5 exceeds the standard for 33% and 57% of measurements based on the daily average standard values of the World Health Organization IT.1 and IT.2, respectively, indicating serious pollution levels. The annual average concentrations of PM2.5 and Terra and Aqua MAIAC AOD all show downward trends. The PM2.5 concentrations are high in winter and spring and low in summer and autumn; Terra and Aqua AOD values are high in spring and summer and low in autumn and winter. The seasonal and annual average concentrations of PM2.5 and AOD all show the regional pattern of "low in the north and high in the south". High-value areas are mainly located in southern Hebei, southwestern Shanxi, western Shandong, and northern Henan, while low-value areas are mainly located in northwestern Shanxi, northern Hebei, and eastern Shandong. The annual average concentration of PM2.5 is between 27 and 99μg·m-3, and the annual average AOD is between 0.20 and 0.69. The correlation between Aqua AOD and PM2.5 concentration is strong whereas and the correlations between Terra AOD, Aqua AOD, and PM2.5vary significantly in different seasons; overall, correlations are strongest in spring and winter and weakest in summer and autumn. After vertical-humidity correction, the correlation between satellite AOD and PM2.5 data is significantly improved. |
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