Beam-global correlations in the Pacific Northwest

Abstract Daily, 10-day, and monthly averaged beam-global correlations are derived for seven sites in the Pacific Northwest. The beam-global correlations are found to vary with time of year in a manner similar to the seasonal variations exhibited by diffuse-global correlations. A good description of the seasonal dependence is produced by introducing a term dependent on the year-day into the correlations. The correlations are compared with data from several sites in the National Oceanic and Atmospheric Administration (NOAA) network and to results from other studies.