Performance of MODIS C6 Aerosol Product during Frequent Haze-Fog Events: A Case Study of Beijing
Performance of MODIS C6 Aerosol Product during Frequent Haze-Fog Events: A Case Study of Beijing
复制标题
MODIS C6 气溶胶产品在雾霾天气频繁发生过程中的表现：以北京为例
DOI：
10.3390/rs9050496
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发表时间：
2017-05-01
期刊：
影响因子：
5
通讯作者：
Yan, Lei
中科院分区：
文献类型：
--
作者：
Chen, Wei;Fan, Aiping;Yan, Lei
新发布的MODIS Collection 6种气溶胶产品已被广泛用于评估5公里的深色目标气溶胶光学深度（DT AOD）产品，新型3 km DT AOD产品和增强的深蓝色（DB）AOD产品。但是，在不同空气质量条件下MODIS AOD产品的代表性尚不清楚。在这项研究中，我们从2001年至2015年获得了所有三种MODIS Terra AOD，并从2003年到2015年获得了北京地区的Aqua AOD，以研究不同空气质量情况下不同AOD产品（集合6）的性能。三种MODIS AOD产品的验证表明，DB AOD的精度最高，预期误差（EE）包膜（散布图上至少包含67％的比赛）为0.05 + 0.15 TAU，然后是10 km dt aod（随后含有10 km dt aod（ 0.08 + 0.2 tau）和3 km dt aod（0.35 + 0.15 tau），专门用于北京。还获得了2013年至2015年MODIS通过期间的近表面PM2.5浓度，以将空气质量归类为未污染，中度和严重污染的空气质量，并分析不同空气质量条件下不同AOD产品的性能。在严重污染的日子里，很少有3公里DT检索出现的MODIS 3公里，因此几乎不可能在北京的空气质量应用中发挥有效作用。尽管DB AOD允许在所有空气质量条件下进行大量检索，但它具有粗糙的空间分辨率。这些结果表明，MODIS 3 km DT AOD产品可能不是在Surface PM2.5卫星检索中使用的适当代理，尤其是对于那些经常发生的雾糊状事件（如北京）的地区。
The newly released MODIS Collection 6 aerosol products have been widely used to evaluate fine particulate matter with a 10 km Dark Target aerosol optic depth (DT AOD) product, a new 3 km DT AOD product and an enhanced Deep Blue (DB) AOD product. However, the representativeness of MODIS AOD products under different air quality conditions remains unclear. In this study, we obtained all three types of MODIS Terra AOD from 2001 to 2015 and Aqua AOD from 2003 to 2015 for the Beijing region to study the performance of the different AOD products (Collection 6) under different air quality situations. The validation of three MODIS AOD products suggests that DB AOD has the highest accuracy with an expected error (EE) envelope (containing at least 67% of the matchups on a scatter plot) of 0.05 + 0.15 tau, followed by 10 km DT AOD (0.08 + 0.2 tau) and 3 km DT AOD (0.35 + 0.15 tau), specifically for Beijing. Near-surface PM2.5 concentrations during the passage of MODIS from 2013 to 2015 were also obtained to categorize air quality as unpolluted, moderately, and heavily polluted, as well as to analyze the performance of the different AOD products under different air quality conditions. Very few MODIS 3 km DT retrievals appeared on heavily polluted days, making it almost impossible to play an effective role in air quality applications in Beijing. While the DB AOD allowed for considerable retrievals under all air quality conditions, it had a coarse spatial resolution. These results demonstrate that the MODIS 3 km DT AOD product may not be the appropriate proxy to be used in the satellite retrieval of surface PM2.5, especially for those areas with frequent haze-fog events like Beijing.