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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Spatial–Temporal Variations in NO2 and PM2.5 over the Chengdu–Chongqing Economic Zone in China during 2005–2015 Based on Satellite Remote Sensing
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Spatial–Temporal Variations in NO2 and PM2.5 over the Chengdu–Chongqing Economic Zone in China during 2005–2015 Based on Satellite Remote Sensing

机译：基于卫星遥感的成渝经济区2005- 2015年NO2和PM2.5的时空变化

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摘要

The Chengdu–Chongqing Economic Zone (CCEZ), which is located in southwestern China, is the fourth largest economic zone in China. The rapid economic development of this area has resulted in many environmental problems, including extremely high concentrations of nitrogen dioxide (NO2) and fine particulate matter (PM2.5). However, current ground observations lack spatial and temporal coverage. In this study, satellite remote sensing techniques were used to analyze the variation in NO2 and PM2.5 from 2005 to 2015 in the CCEZ. The Ozone Monitoring Instrument (OMI) and the Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical depth (AOD) product were used to retrieve tropospheric NO2 vertical columns and estimate ground-level PM2.5 concentrations, respectively. Geographically, high NO2 concentrations were mainly located in the northwest of Chengdu and southeast of Chongqing. However, high PM2.5 concentrations were mainly located in the center areas of the basin. The seasonal average NO2 and PM2.5 concentrations were both highest in winter and lowest in summer. The seasonal average NO2 and PM2.5 were as high as 749.33 × 1013 molecules·cm−2 and 132.39 µg·m−3 in winter 2010, respectively. Over 11 years, the annual average NO2 and PM2.5 values in the CCEZ increased initially and then decreased, with 2011 as the inflection point. In 2007, the concentration of NO2 reached its lowest value since 2005, which was 230.15 × 1013 molecules·cm−2, and in 2015, the concentration of PM2.5 reached its lowest value since 2005, which was 26.43 µg·m−3. Our study demonstrates the potential use of satellite remote sensing to compensate for the lack of ground-observed data when quantitatively analyzing the spatial–temporal variations in regional air quality.
机译：成都-重庆经济区（CCEZ）位于中国西南部，是中国第四大经济区。该地区的快速经济发展已导致许多环境问题，包括极高浓度的二氧化氮（NO2）和细颗粒物（PM2.5）。但是，当前的地面观测缺乏时空覆盖。在这项研究中，使用卫星遥感技术分析了CCEZ在2005年至2015年期间NO2和PM2.5的变化。臭氧监测仪（OMI）和中分辨率成像光谱仪（MODIS）气溶胶光学深度（AOD）产品分别用于检索对流层NO2垂直柱并估算地面PM2.5浓度。从地理上讲，高NO2浓度主要位于成都的西北部和重庆的东南部。但是，高PM2.5浓度主要位于流域中心区域。季节平均NO2和PM2.5浓度在冬季最高，而在夏季最低。季节性平均NO2和PM2.5分别高达749.33×10 13 分子·cm −2 和132.39 µg·m -3 分别是2010年冬季。在过去的11年中，CCEZ的年平均NO2和PM2.5值开始上升，然后下降，以2011年为拐点。 2007年，NO2的浓度达到2005年以来的最低值，为230.15×10 13 分子·cm −2 ，2015年，PM2.5的浓度达到自2005年以来的最低值，即26.43 µg·m -3 。我们的研究表明，在定量分析区域空气质量的时空变化时，可以利用卫星遥感来弥补地面观测数据的不足。

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