Description: | Beginning on 6/13, there was a problem with the solar
tracker/shading at Atqasuk. The observed downwelling shortwave
was not in good agreement with the theoretical value calculated
from the direct, diffuse, and solar zenith angle, which usually
indicates a tracking problem. The direct (NIP) data occasionally
exhibited a stair-step pattern of dropping off slightly for a few
minutes, then rising, then dropping off again, rather than the
smooth increase during the hours of greater sunlight that is
normally observed in clear sky conditions.
This problem was resolved on the morning of 6/20. |