Data sets currently available on SRRL AOD web site
- NREL Solar Radiation Research Laboratory (AOD)
- NREL Solar Radiation Research Laboratory (AOD SkyNet Level 0)
- NREL Solar Radiation Research Laboratory (AOD SkyNet Level 1.1)
- NREL Solar Radiation Research Laboratory (AOD ESR Level 0)
- NREL Solar Radiation Research Laboratory (AOD ESR Level 1.1)
- MIDC Station Comparison
- Instrument history and meta data.
A multi-channel photometer can be used to calculate the Aerosol Optical Depth (AOD) at various wavelengths. The National Renewable Energy Laboratory (NREL) has purchased a 7-channel Prede POM-01 Photometer. This system collects raw photometer data that is then sent to European Sky Radiometers (ESR) Network for data processing every hour. The processed AOD results are then posted on the ESR web site. NREL grabs this data and posts it to the MIDC web site so that can be readily available with the Baseline Measurement System at SRRL. The ESR has two methods of processing data, SkyNet SkyRad Method and the ESR SunRad Method, each with two or more levels. It may take ESR a few days to process the daily level 0 data and a few months to process the monthly level 1.1 data which is then grabbed by NREL/MIDC on a daily basis (2 hours after midnight), therefore any real-time data that is posted to the MIDC web site could be several days behind for level 0 and several months behind for level 1.1. The level 1.1 data set is of higher quality than level 0. ESR reprocesses all the level 0 data at the end of each month using a new solar calibration constant to produce the level 1.1 data.