NSA/GNDRAD/C1 - Unreasonable/missing PIR data due to maintenance

During this period, there are data gaps and the data that were
collected are unreasonable.  Instrument maintenance was being
performed

• PSP1 unshaded maximum(psp1_max)
• NET mean(net_mean)
• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• Net Radiation, Minima(net_min)
• PIR1 unshaded minimum(pir1_min)
• Net Radiation(net)
• NET standard deviation(net_sd)
• Net Radiation, Standard Deviation(net_std)
• PSP1 unshaded mean(psp1_mean)
• PSP1 unshaded minimum(psp1_min)
• Net Radiation, Maxima(net_max)
• PSP1 unshaded standard deviation(psp1_sd)

NSA/GNDRAD/C1 - Noisy PIR Data

During the period referenced, the ground PIR was noisy in comparison to the sky PIR data.  
At the end of November, the noise increased to roughly 10 W/m2 from peak to peak.  After 
12/23/98, the noise decreased in amplitude but still had noisy patterns.  

On 01/17-18/99, there was an increase again in the noise level (4 GMT 01/17 - 5 GMT 
01/18). During this period the gndrad IRT data also exhibited noise patterns (the IRT was not 
operational).

In February, the instrument exhibited large noise variations again.  On 02/16, a wiring 
problem was corrected and the noise dropped back to 1-5 W/m2.  However, the noise levels 
began to increase again.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded minimum(pir1_min)

NSA/GNDRAD/C1 - PIR1 Calibration problems resulted in small error

The dome correction coefficients were not properly reset in calibration file until the 
early morning of 12/15. These errors probably account for less than 4% in error.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded minimum(pir1_min)

NSA/GNDRAD/C1 - IRT removed for testing

The IRT instrument was at PNNL for cold temperature modifications and testing. Instruments 
returned for the summer season. Data collected after the instrument return looks 
reasonable. 

IRT data recorded during the period the instrument was removed is bad.

• IRT1 standard deviation(irt1_sd)
• IRT1 mean(irt1_mean)
• IRT1 maximum(irt1_max)
• IRT1 minimum(irt1_min)

NSA/GNDRAD/C1 - PIR offline

The PIR was taken off line during this period; data recorded 
              during this period are garbage.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded minimum(pir1_min)

NSA/GNDRAD/C1 - Instrument maintenance

Instrument replaced. Data affected by the work done during this time.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded minimum(pir1_min)

NSA/GNDRAD/C1 - Bad PSP calibrations applied

The ground radiation data are bad during this period due to 
              erroneous calibration factors in the logger configuration file.

• PSP1 unshaded maximum(psp1_max)
• NET mean(net_mean)
• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• Net Radiation, Minima(net_min)
• PIR1 unshaded minimum(pir1_min)
• Net Radiation(net)
• NET standard deviation(net_sd)
• Net Radiation, Standard Deviation(net_std)
• PSP1 unshaded mean(psp1_mean)
• PSP1 unshaded minimum(psp1_min)
• Net Radiation, Maxima(net_max)
• PSP1 unshaded standard deviation(psp1_sd)

NSA/GNDRAD/C1 - IRT insufficiently heated

IRT had insufficient heating to maintain an internal reference temperature above 0 degrees 
C.  Measurements of sky temperature were over-estimated when instrument was below 
freezing.

• IRT1 standard deviation(irt1_sd)
• IRT1 mean(irt1_mean)
• IRT1 maximum(irt1_max)
• IRT1 minimum(irt1_min)