Global Distribution of Column Satellite Aerosol Optical Depth to Surface PM2.5Relationships
Global Distribution of Column Satellite Aerosol Optical Depth to Surface PM2.5Relationships
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DOI：
10.3390/rs12121985
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发表时间：
2020-06-01
期刊：
影响因子：
5
通讯作者：
Gupta, Pawan
中科院分区：
文献类型：
--
作者：
Christopher, Sundar;Gupta, Pawan
使用组合的Terra和Aqua中分辨率成像光谱仪（MODIS）中可见光气溶胶光学厚度（AOD）产品，空间分辨率为0.1 x 0.1度，（空气动力学直径小于2.5 μ m的颗粒物）监测仪，我们提供了一个全球五年（2015-2019）的空间和季节AOD-PM（2.5）的斜率，截距和相关系数的关系的评估。本研究仅使用通过开放的空气质量门户网站访问的地面监测数据，这些数据可供全球社区用于空气质量研究和决策。这些以1 x 1度分辨率报告的统计数据非常重要，因为卫星AOD通常与空间有限的地面PM（2.5）监测器一起使用，以估计全球表面颗粒物浓度分布。结果表明，超过3000地面监测器，现在可用于PM（2.5）的研究。虽然在全球范围内，气溶胶光学厚度和PM（2.5）之间的相关系数有很大的差异，但在所有季节的平均值下，相关系数为0.55，单位气溶胶光学厚度产生54 μ gm（-3）的PM 2.5（斜率），截距为8 μ gm（-3）。虽然在过去十年中，地面PM（2.5）测量的数量增加了10倍，但仍然需要共同努力，继续在没有地面监测器的地区增加这些监测器，特别是在大型人口中心，这将进一步利用卫星数据的优势。
Using a combined Terra and Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) mid-visible aerosol optical depth (AOD) product at 0.1 x 0.1-degree spatial resolution and collocated surface PM2.5(particulate matter with aerodynamic diameter smaller than 2.5 mu m) monitors, we provide a global five-year (2015-2019) assessment of the spatial and seasonal AOD-PM(2.5)relationships of slope, intercepts, and correlation coefficients. Only data from ground monitors accessible through an open air-quality portal that are available to the worldwide community for air quality research and decision making are used in this study. These statistics that are reported 1 x 1-degree resolution are important since satellite AOD is often used in conjunction with spatially limited surface PM(2.5)monitors to estimate global distributions of surface particulate matter concentrations. Results indicate that more than 3000 ground monitors are now available for PM(2.5)studies. While there is a large spread in correlation coefficients between AOD and PM(2.5,)globally, averaged over all seasons, the correlation coefficient is 0.55 with a unit AOD producing 54 mu gm(-3)of PM2.5(Slope) with an intercept of 8 mu gm(-3). While the number of surface PM(2.5)measurements has increased by a factor of 10 over the last decade, a concerted effort is still needed to continue to increase these monitors in areas that have no surface monitors, especially in large population centers that will further leverage the strengths of satellite data.