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| AEROSOL OPTICAL DEPTH - Direct Sun Measurements |
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Sun photometer measurements of the direct (collimated) solar radiation provide information to calculate the columnar aerosol optical depth (AOD). AOD can be used to compute columnar water vapor (Precipitable Water) and estimate the aerosol size using the Angstrom parameter relationship. Two data versions (Versions 1 and 2) and three quality levels (Levels 1.0, 1.5, 2.0) exist for each product. While Levels 1.0 and 1.5 are provided in near real-time, the 12-month or longer delay (due to final calibration and manual inspection) ensures that the highest quality data can be found in Version 2, Level 2.0 data products. Version 2 AOD processing now includes fine and coarse mode AOD as well as fine mode fraction.
+ Read More |
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| Version 2 Data Display |
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Level 2.0 Data Display
Access Data Displays
+ Level 1.0 - unscreened data but may not have final calibration applied
+ Level 1.5 - cloud-screened data but may not have final calibration applied. These data are not quality assured.
+ Level 2.0 - pre- and post-field calibration applied, cloud-screened, and quality-assured data
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| Data Download |
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+ Version 2 Download Tool - AOD, Precipitable Water, Angstrom Parameter, Total Optical Depth, Fine and Coarse Mode AOD and Fine Mode Fraction
(specify site and time range for all levels)
+ Version 1 Download Tool - AOD, Precipitable Water, Angstrom Parameter, Almcuantar retrievals
(specify site and time range for all levels)
+ Download Level 2.0 Data Files -
(all sites and times in one compressed file for Versions 1 and 2, Level 2.0)
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| Version 2.0 Climatology |
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Level 2.0 Climatology Tables
+ AOD Climatology Tables
+ Download AOD Monthly Averages (all sites)
+ Download AOD Overall Averages
(all sites)
Level 2.0 Map Animations
+ 500nm AOD
+ 870-440nm Angstrom Parameter
+ Download AOD and Angstrom Parameter (select sites)
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