I think a test that the upper radiometers are obscured is that Rsw.out > Rsw.in.  At low sun angles (sunrise, sunset – not a Fiddler on the Roof song), this could be real, but I'm pretty sure I've seen it associated with snow on the shields.

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  1. Daniel Buonome

    I'm going to poke a few holes in the tape between the up looking rads at a tbd site as a test to mitigate the snow piles. Stay tuned...