2.1.4. SURFRAD Data

The global downwelling and upwelling solar radiations are continuously recorded by skyward facing and downward facing Eppley model 8–48 pyranometers mounted on a meteorological tower. Table 1 specifies the height of each tower above the target.


**Table 1.** Geolocation and brief description of the US surface radiation budget observing network (SURFRAD) sites considered in this study.
