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Continuing the ARTSE piggy-back, also tested NR12 NR01 #12 at about 11:20 on 1 Aug 2017. This time the procedure was:
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In this case, the results were:
- Rsw.in total before/after: 887/887 (no change)
- Rsw.in diffuse before/after: 101.5/102.5
- Rlw.in total before/after: 371.8/370.4
- Rlw.in diffuse before/after: 374/372
All of these changes are quite small, <1%. In the case of Rlw.in, my head in the field of view may have affected the results. Thus, this radiometer did not require this full procedure and we will not have to correct its data. Nevertheless, we should repeat this procedure on all the other radiometers when they return.
Also notable is that the diffuse effect on Rlw.in was small – under 2 W/m2 for a change in Rsw of 785 W/m2, or a "swcor" value of < 0.25%. The Epply PIRs we tested in 2003 had values from 0.2–1.9%. Thus, the NR01 Rlw is pretty good. before/after: