Description: | Subject: Unshaded PSP dirty domes
Platform/Measurement: sgpsiros/unshaded PSP
What location was the data collected at: E8, E11
Period of time in question
Begin Date 03/21/96
End Date 04/02/96
Discussion of Problem:
Large differences between estimates of downwelling hemispheric
shortwave radiation from the unshaded PSP and the combination
of the NIP and shaded PSP were observed as early as March 21,
1996 and lasted through April 2, 1996 when Site Operations
cleaned the radiometer domes at E8. The differences were as
high as 150 W/m^2 during the late afternoon on several days
within this period. The cause of the differences seems to be
dirt on the unshaded PSP dome (which was observed before the
dome was cleaned) causing the estimate from the unshaded PSP
to be lower than expected. The dome condition observation
was obtained by email communication with Site Operatons
staff and is not know to be logged elsewhere.
Differences in the downwelling hemispheric shortwave estimates
at E11 (though not nearly as large as at E8) showed improvement
after dome cleaning activities on April 2, as well.
A postscript file attachment depicts the data for E8 on
April 2 and the cleaning of the dome can be identified at the time:
Day of Year 93.82, or at about 1930Z. |