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At FLR we select data with sun elevation greater than 20 degrees (to clear the sidewalls). The median ratio of Rsw.global/Rsw.in = 1.0358, which is perhaps higher because the bird droppings obscured Rsw.in at times. I conclude that Rsw.global could be used as a reasonable surrogate for Rsw.in during those times. Rsw.in.flr data were deleted from Oct 14-20 when the residuals from a linear fit of Rsw.global.flr vs Rsw.in.flr exceeded 20 W/m^2, as indicated by the highlighted data in the right-hand plot below.
After deleting that Rsw.in.flr data, the linear fit changed slightly to Rsw.global.flr = 1.029*Rsw.in.flr + 1.07 W/m^2.| Section |
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