Some odd artifacts in Rsw in the transition between when direct sun is blocked by the mountains, but the sun hasn't set. 

First, from several days ago, I see the amount of incoming (diffuse) radiation higher at, say 15:40 than it was at 15:00.  Perhaps the amount of cirrus cloud coverage changed during this period?

 

Second, today I see Rsw.out.9m higher than the incomings at 15:00.  Usually, I'd blame this on snow covering the incoming sensors, but Rsw.in.9m is within a CVF4 housing that <should> be keeping it clean.  Also, Rsw.in from the NR01 tracks Rsw.in.9m quite well, even though it has no housing and a different construction.  Thus, I'm inclined to think that this is a real reflection somehow.

P.S. Note the large change in albedo between these two days, due to the recent snow.

P.P.S. The huge dip in Rsw.in.uw at 09:30 is due to the earlier-mentioned shading by the uw tower.

1 Comment

  1. Unknown User (jdlund)

    The NOAA RadSys has a similar (but not identical) pattern (maybe light reflected off the surrounding peaks?):