NSA/GNDRAD/C1 - Noisy PIR Data

During the period referenced, the ground PIR was noisy in  
              comparison to the the sky PIR data.  (Note U021211.1 documents
              same problem for 9/1/98-2/28/99)

              The noise problem continued after the GNDRAD data logger was 
              replaced in late September. Particularly strong examples of the 
              noise can be seen in data from 11/10 - 11/19/99. The peak to 
              peak noise reaches 12 W/m2.

• pir1_mean
• pir1_max
• pir1_min
• pir1_sd

• pir1_max
• pir1_sd
• pir1_min
• pir1_mean

NSA/GNDRAD/C1 - IRT instrument maintenance

IRT offline while instrument cable was being rebuilt.  Data are bad.

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

• irt1_max
• irt1_min
• irt1_sd
• irt1_mean

NSA/GNDRAD/C1 - IRT data noisy

After re-installation of the IRT on 12/10/99, the data are noisy. Source of the noise is 
believed to be the heater connected directly to the IRT.  Instrument was taken offline on 
12/30/1999 and shipped back to PNNL for repair/testing.

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

• irt1_max
• irt1_min
• irt1_sd
• irt1_mean

NSA/GNDRAD/C1 - Unreasonable PSP Data

During the darkness in the middle of this night, the PSP had a
              signal of 15 W/m2 over a three hour long period.  Cause unknown.

• psp1_min
• psp1_max
• psp1_mean
• psp1_sd

• psp1_mean
• psp1_sd
• psp1_min
• psp1_max

NSA/GNDRAD/C1 - Unexplained decrease in PSP and NET data values

100 W/m2 dip in the PSP data; NET data also affected. Possibly 
              due to operators working around the instruments.

• net
• net_min
• psp1_sd
• net_std
• net_mean
• net_sd
• psp1_min
• net_max
• psp1_max
• psp1_mean

• psp1_mean
• psp1_sd
• net_std
• net_max
• psp1_min
• psp1_max
• net_mean
• net_min
• net
• net_sd

NSA/GNDRAD/C1 - Data corrupted by brief spike

There is a unreasonable spike at this time. Simultaneous spikes on the NET, the PSP, and 
the PIR. Cause unknown, but most likely related to data logger.

• net
• psp1_sd
• net_std
• net_mean
• net_max
• psp1_mean
• pir1_max
• net_min
• pir1_mean
• pir1_sd
• net_sd
• psp1_min
• psp1_max
• pir1_min

• net_max
• psp1_min
• pir1_max
• net_mean
• net_min
• psp1_mean
• psp1_sd
• net_std
• psp1_max
• pir1_sd
• pir1_min
• pir1_mean
• net
• net_sd

NSA/GNDRAD/C1 - Rad instruments shaded by shelter

Each day around 02:00 - 03:30 GMT there is a unexpected decrease 
              for the PSP irradiance measurement due to a shading problem 
              associated with the swing set location relative to the instrument 
              shelter.  The GNDRAD NET and MFR instrument data also reflects 
              this problem.  Problem was resolved when the GNDRAD instruments 
              were moved to the 10 meter tip tower.

• net
• psp1_sd
• net_std
• net_mean
• net_max
• psp1_mean
• pir1_max
• net_min
• pir1_mean
• pir1_sd
• net_sd
• psp1_min
• psp1_max
• pir1_min

• net_max
• psp1_min
• pir1_max
• net_mean
• net_min
• psp1_mean
• psp1_sd
• net_std
• psp1_max
• pir1_sd
• pir1_min
• pir1_mean
• net
• net_sd

NSA/GNDRAD/C1 - Missing data

Data are missing and unrecoverable.

• Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Maxima(up_short_hemisp_max)
• up_short_hemisp_std
• Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Minima(up_short_hemisp_min)
• inst_up_long_hemisp_tp
• alt
• lon
• inst_up_long_hemisp_case_temp
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• vBatt
• Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
• Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
• inst_up_long_hemisp_dome_temp
• base_time
• Surface Infra-Red Temperature Minima(sfc_ir_temp_min)
• sfc_ir_temp_std
• up_long_hemisp_std
• lat
• Surface Infra-Red Temperature Maxima(sfc_ir_temp_max)
• logger_temp
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• time
• time_offset

NSA/GNDRAD/C1 - Net radiometer removed

The net radiometer was removed from the NSA.C1 GNDRAD instrument suite on Feb 3, 2000.  
Net rad variables were filled with garbage data until Sept 23, 2000 and with missing values 
(-9999) until 20041103.  The net rad variables were removed from the netcdf files after 
20041103.

A reprocessing task (RID-526) has been submitted to the queue to address the need to add 
metadata to the NSA.C1 GNDRAD netcdf files documenting the missing data as well as to move 
toward a consistent datastream format throughout time.

• base_time

• net_mean
• net_std
• net_max
• net_min
• net
• net_sd

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)

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