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

NSA/GNDRAD/C1 - PIR offline

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

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

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

NSA/GNDRAD/C1 - IRT not connected

The IRT was unplugged from the Zeno data logger on 12/10/1998 for a interference test and 
when it was plugged back in on 12/22, the connector at the data logger was damaged. The 
data logger and connecter were replaced on 1/20/1999.

• Surface Infra-Red Temperature Maxima(sfc_ir_temp_max)
• Surface Infra-Red Temperature, Standard Deviation(sfc_ir_temp_std)
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• Surface Infra-Red Temperature Minima(sfc_ir_temp_min)

NSA/GNDRAD/C1 - Reprocess: IRT scale factor

The IRT scale factors in the data logger were incorrectly set to m = 100 degC/V, b = -60 
degC. They were corrected to 25 degC/V and -50 degC.

Correct with: IRT(C) = (IRT_bad+60C)*(25/100) - 50C

• Surface Infra-Red Temperature Maxima(sfc_ir_temp_max)
• Surface Infra-Red Temperature, Standard Deviation(sfc_ir_temp_std)
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• Surface Infra-Red Temperature Minima(sfc_ir_temp_min)

NSA/GNDRAD/C1 - IRT failed

The IRT failed and was replaced with one installed inside an insulated enclosure.

• Surface Infra-Red Temperature Maxima(sfc_ir_temp_max)
• Surface Infra-Red Temperature, Standard Deviation(sfc_ir_temp_std)
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• Surface Infra-Red Temperature Minima(sfc_ir_temp_min)

NSA/GNDRAD/C1 - Reprocess: IRT insufficiently heated

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

Data will be reprocessed, but users can correct data using the following correction 
factor:

If T_reference < -5?C, then

  IRT_corrected = (IRT_original - 32.993K)/0.87238

where T_reference can be estimated with the ambient temperature (e.g. 
inst_up_long_hemisp_dome_temp or inst_up_long_dome_temp)

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