研究目的
Evaluating the performance of three VIIRS AOD products under different air quality conditions over Wuhan to ensure accurate PM2.5 predictions.
研究成果
The study concludes that VIIRS_EDR_QF > 1 AOD products are more suitable for heavy air pollution, VIIRS_EDR_QF = 3 AOD for moderate pollution, and VIIRS_IP AOD for clean weather. Seasonal analysis suggests VIIRS_EDR_QF = 3 AOD is best for spring and autumn, VIIRS_IP AOD for summer, and VIIRS_EDR_QF > 1 AOD for winter. These findings guide the selection of appropriate AOD products for air quality monitoring applications.
研究不足
The study is limited by the successful retrieval rates of VIIRS AOD products under different pollution levels and the seasonal variation in AOD retrieval accuracy. The performance of VIIRS AOD products may vary in other regions with different environmental conditions.
1:Experimental Design and Method Selection:
The study collected three types of VIIRS AOD products from January 2014 to December 2016 to evaluate their performance under different air quality conditions categorized by near-surface PM
2:5 concentrations. Sample Selection and Data Sources:
Near-surface PM
3:5 concentrations were collected from the Ministry of Environmental Protection's observation network, and AOD products were matched with sun photometer observations. List of Experimental Equipment and Materials:
A Cimel sun photometer, CE-318, was used for ground-based AOD measurements.
4:Experimental Procedures and Operational Workflow:
AOD products were matched with sun photometer data within 30 min of VIIRS overpass, and performance was evaluated based on successful retrieval rate and AOD accuracy.
5:Data Analysis Methods:
Root mean square error and mean absolute difference were calculated to evaluate the accuracy of VIIRS AOD products against sun photometer observations.
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