A New Modis C6 Dark Target and Deep Blue Merged Aerosol Product on a 3 km Spatial Grid
Journal Article - Open Access
NAVAL RESEARCH LAB MONTEREY CA MONTEREY United States
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In Moderate Resolution Imaging Spectroradiometer MODIS Collection C6 aerosol products, the Dark Target DT and Deep Blue DB algorithms provide aerosol optical depth AOD observations at 3 km DT3K and 10 km DT10K, and at 10 km resolution DB10K, respectively. In this study, the DB10K is resampled to 3 km grid DB3K using the nearest neighbor interpolation technique and merged with DT3K to generate a new DT and DB merged aerosol product DTB3K on a 3 km grid using Simplified Merge Scheme SMS. The goal is to supplement DB10K with high-resolution information over dense vegetation regions where DT3K is susceptible to error. SMS is defined as an average of the DT3K and DB3K AOD retrievals or the available one with the highest quality flag. The DT3K and DTB3K AOD retrievals are validated from 2008 to 2012 against cloud-screened and quality-assured AOD from 19 AERONET sites located in Europe. Results show that the percentage of DTB3K retrievals within the expected error EE -0.05 20 and data counts are increased by 40 and 11 , respectively, and the root mean square error and the mean bias are decreased by 26 and 54 , respectively, compared to the DT3K retrievals. These results suggest that the DTB3K product is a robust improvement over DT3K alone, and can be used operationally for air quality and climate-related studies as a high-resolution supplement to the current MODIS product suite.
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