研究目的
To determine if MODIS measurements of aerosol optical depth reflect the actual conditions based on ground-based measurements of aerosol optical depth in Alaska.
研究成果
The Aqua MODIS AOD 10-km and all of the 3-km MODIS AOD products are valid between the months of April and October over the Bonanza Creek and Utqiagvik (Barrow) sites. All of the collection 6 dark target ocean MODIS AOD products are valid over the ocean in Alaska. These findings indicate that MODIS collection 6 AOD products can be used quantitatively in air quality applications in Alaska during the summer months.
研究不足
MODIS AOD data could only be obtained between the months of April and October due to the presence of snow in Alaska during winter months. The study is limited to the validation of MODIS AOD products over two AERONET sites in Alaska.
1：Experimental Design and Method Selection
The study validated MODIS AOD measurements at 550 nm against AOD derived from two ground-based AERONET sunphotometers in Alaska. MODIS AOD was obtained from MODIS collection 6 using the dark target Land and Ocean algorithms from years 2000 to 2014.
2：Sample Selection and Data Sources
AERONET sites at Utqiagvik (Barrow) and Bonanza Creek were used for validation. MODIS data was only available between April and October.
3：List of Experimental Equipment and Materials
MODIS data from Terra and Aqua satellites, AERONET sunphotometers.
4：Experimental Procedures and Operational Workflow
Spatially and temporally collocated MODIS and AERONET AOD measurements were obtained. Linear regressions were calculated using ordinary least squares for all AOD, for AERONET AOD less than 0.15, and for AERONET AOD greater than 0.15.
5：Data Analysis Methods
Root mean square error (RMSE), median and mean bias, and the fraction of data within error envelope were calculated. Data validity was evaluated based on three criteria.
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