| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D051229.5 | NIM/MFRSR/M1 - Instrument not shading properly | nimmfrsrM1.00, nimmfrsrM1.a0, nimmfrsrM1.b1 |
| D060221.1 | NIM/MPL/M1 - False Positive Cloud Base Height Values During Solar Noon | nimmplM1.00, nimmplM1.a1 |
| D060307.1 | NIM/MWRP/M1 - Software problem | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
| D060321.3 | NIM/SONDE/M1 - RH data incorrect. | nimsondewnpnM1.b1 |
| D060407.1 | NIM/MET/M1 - Software problem | nimmetM1.b1 |
| D060419.3 | NIM/MWRP/M1 - Instrument noise problem | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
| D060420.5 | NIM/MWRP/M1 - IRT Sensor Calibration | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
| D060523.3 | NIM/AOS/M1 - Mass flow controller failure | nimaosM1.a1, nimaosauxM1.a1, nimaosccnM1.a1 |
| D060523.4 | NIM/AOS/M1 - Nephelometer failure | nimaosM1.a1 |
| D060524.2 | NIM/MET/M1 - ORG failure | nimmetM1.b1 |
| D060602.2 | NIM/MWRP/M1 - Reprocessed: IRT configuration setting error | nimmwrpM1.b1 |
| D060619.1 | NIM/MWRP/M1 - Reprocessed - New retrieval coefficients | nimmwrpM1.b1 |
| D060713.1 | NIM/MWRP/M1 - 51.25 GHz channel calibration drifted | nimmwrpM1.b1 |
| D060929.1 | NIM/MWRP/M1 - Sun in radiometer's field of view | nimmwrpM1.b1 |
| D061003.3 | NIM/MWRP/M1 - IRTs do not agree with AERI | nimmwrpM1.b1 |
| D061107.1 | NIM/MFRSR/M1 - Shading problem | nimmfrsrM1.00, nimmfrsrM1.a0, nimmfrsrM1.b1 |
| D061117.1 | NIM/MWRP/M1 - Reprocessed: K-band calibration drift corrected | nimmwrpM1.b1 |
| D061206.1 | NIM/AOS/M1 - Bypass valve failure | nimaosM1.a1, nimaosauxM1.a1, nimaosccnM1.a1 |
| D061206.2 | NIM/AOS/M1 - Impactor switch stuck in 10 micron mode | nimaosM1.a1 |
| D061206.3 | NIM/AOS/M1 - Flow controller failure | nimaosM1.a1, nimaosauxM1.a1, nimaosccnM1.a1 |
| D061207.3 | NIM/AOS/M1 - CCN failure | nimaosccnM1.a1 |
| D061215.5 | NIM/AOS/M1 - Missing data | nimaosM1.a1, nimaosauxM1.a1, nimaosccnM1.a1 |
| D080304.3 | NIM/MET/M1 - ORG underestimated precipitation | nimmetM1.b1 |
| D081022.11 | NIM/MET/M1 - Wind Speed data contain offset due to induced voltage | nimmetM1.b1 |
| D091217.1 | NIM/MET/M1 - PWD cumulative precipitation incorrect | nimmetM1.b1 |
| D091217.2 | NIM/MET/M1 - PWD 1 minute rainfall data suspect | nimmetM1.b1 |
| D101020.4 | NIM/AOS/M1 - Data processing problem | nimaosM1.a1, nimnoaaaosM1.b1, nimnoaaaosavgM1.b1 |
| D111006.8 | NIM/MET/M1 - Deployment period | nimmetM1.b1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/25/2005 | 1500 | 02/01/2006 | 1130 |
| Subject: | NIM/MFRSR/M1 - Instrument not shading properly |
| DataStreams: | nimmfrsrM1.00, nimmfrsrM1.a0, nimmfrsrM1.b1 |
| Description: | Shadowband not shading properly between 0830 and 1500. Do not use diffuse or direct data in this range. Maintenance on 2/1/2006 resolved the problem. |
| Measurements: | nimmfrsrM1.a0:
nimmfrsrM1.b1:
nimmfrsrM1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/27/2005 | 0000 | 04/20/2006 | 1400 |
| Subject: | NIM/MPL/M1 - False Positive Cloud Base Height Values During Solar Noon |
| DataStreams: | nimmplM1.00, nimmplM1.a1 |
| Description: | As the laser ages, the output reduces. This lowers the signal to noise ratio. The lower signal to noise ratio interferes with the cloud base height algorithm to correctly determine if a cloud is actually present. During solar noon the signal to noise ratio is the lowest. This condition results in many false positive values. The values start at a high altitude and progressively get lower as the sun gets to zenith. The trend reverses as the sun passes. The pattern in the data resembles a ?V? shape starting 2 hours before solar noon to 2 hour past. A low incident of false positive values exists from 20051227. However, the condition becomes prominent on 20060303 - 20060420. The cloud base calibration table was modified to compensate for the lower signal to noise levels. Note: If a cloud is actually present, the cloud base algorithm will determine the height and report correctly. The false positive values are only a concern during cloud free conditions. |
| Measurements: | nimmplM1.00:
nimmplM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/28/2006 | 1100 | 03/07/2006 | 1615 |
| Subject: | NIM/MWRP/M1 - Software problem |
| DataStreams: | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
| Description: | The MWRP computer failed and it was cloned with a new Gx620. Soon after, the MWRP program started to crash and was intermittent. Data were lost on March 3, 4, 5. On March 7 the program was forcefully ended and restarted. This appears to have cleared the problem. The instrument has been running since. |
| Measurements: | nimmwrpM1.00:
nimmwrpM1.b1:
nimmwrprawM1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/11/2006 | 0500 | 03/11/2006 | 0501 |
| Subject: | NIM/SONDE/M1 - RH data incorrect. |
| DataStreams: | nimsondewnpnM1.b1 |
| Description: | RH% values oscillate between ambient values and 0%. The 0% RH values are incorrect. |
| Measurements: | nimsondewnpnM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/10/2006 | 1600 | 03/01/2006 | 0803 |
| Subject: | NIM/MET/M1 - Software problem |
| DataStreams: | nimmetM1.b1 |
| Description: | Intermittent Failure of Logger to read data from the Barometer. |
| Measurements: | nimmetM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/2006 | 0000 | 01/08/2007 | 0000 |
| Subject: | NIM/MWRP/M1 - Instrument noise problem |
| DataStreams: | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
| Description: | There are spikes and elevated noise in MWRP data. The origine of the spikes is RF interference from various sources. All brightness temperatures are affected, but in particular the 5 K-band channels. LWP retrievals are noisy and affected by spikes as a result. |
| Measurements: | nimmwrpM1.00:
nimmwrpM1.b1:
nimmwrprawM1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/15/2006 | 0000 | 06/03/2006 | 0000 |
| Subject: | NIM/MWRP/M1 - IRT Sensor Calibration |
| DataStreams: | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
| Description: | Discrepancies between the MWRP and Skyrad IRT were observed in January. The MWRP IRT readings were constantly higher than those of the skyrad IRT. Some changes were introduced to the MWRP IRT to address the problem (see DQR D060602.2). On May 3, the IRT mirror was replaced. After the change in the mirror, the MWRP IRT readings became about 5-8 C lower. On June 3 the agreement between MWRP and Skyrad IRT became satisfactory (2-5 degree C difference). It is hard to numerically quantify the difference in the IRT readings caused by the change in the mirror. We can only warn the user that between January 1 and June 3 the MWRP readings are 8 to 15 degree higher than the skyrad IRT. |
| Measurements: | nimmwrpM1.00:
nimmwrpM1.b1:
nimmwrprawM1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/04/2006 | 1800 | 05/13/2006 | 0748 |
| Subject: | NIM/AOS/M1 - Mass flow controller failure |
| DataStreams: | nimaosM1.a1, nimaosauxM1.a1, nimaosccnM1.a1 |
| Description: | The mass flow controller stopped working. A replacement one was installed at the site. |
| Measurements: | nimaosccnM1.a1:
nimaosM1.a1:
nimaosauxM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/12/2006 | 0250 | 05/26/2006 | 1540 |
| Subject: | NIM/AOS/M1 - Nephelometer failure |
| DataStreams: | nimaosM1.a1 |
| Description: | There was was an electronic problem with one of the nephelometer circuit boards and the measurements of aerosol scattering coefficients were not recorded. |
| Measurements: | nimaosM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/13/2006 | 0000 | 05/26/2006 | 1015 |
| Subject: | NIM/MET/M1 - ORG failure |
| DataStreams: | nimmetM1.b1 |
| Description: | The optical rain gauge on the met system did not record precipitation during this time period. |
| Measurements: | nimmetM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/15/2006 | 0000 | 04/21/2006 | 0000 |
| Subject: | NIM/MWRP/M1 - Reprocessed: IRT configuration setting error |
| DataStreams: | nimmwrpM1.b1 |
| Description: | The infrared thermometer settings (IRT) were not configured as specified by the manufacturer. The analog output was set to a range of -60 to +50 C (0-10V) instead of -50 to +50 C (0-10V). The settings were changed on April 20. The IR temperatures should be slightly smaller than reported. The data have been reprocessed to correct the IRT calibrations. Reprocessed data were archived in August 2006. |
| Measurements: | nimmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/2006 | 0000 | 08/24/2006 | 2300 |
| Subject: | NIM/MWRP/M1 - Reprocessed - New retrieval coefficients |
| DataStreams: | nimmwrpM1.b1 |
| Description: | Occasionally, the retrieved relative humidity was exceeding 120%. Upon reviewing the data it was noticed that the high values were appearing in the highest layers (above 8 km) and especially during spring season. Since retrievals at the highest levels are mainly affected by the climatology used to constrain the retrievals, we reviewed the statistical coefficients that were used to retrieve temperature and humidity. It was discovered that, in the training dataset (radiosonde), there were a few outliers (invalid radiosonde soundings) that had escaped the screening process and were affecting the computations of the retrieval coefficients. We recomputed the retrieval coefficients with the newly screened set of radiosonde data and reprocessed all the previous data at Niamey. The reprocessed data were archived in August 2006. The new coefficients improve temperature and humidity profiles in two ways. The relative humidity will not exceed 120% in the upper layers and the temperature profiles will be in better agreement with the sonde in the first 4 km. |
| Measurements: | nimmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/05/2006 | 0000 | 01/08/2007 | 0000 |
| Subject: | NIM/MWRP/M1 - 51.25 GHz channel calibration drifted |
| DataStreams: | nimmwrpM1.b1 |
| Description: | After a power outage on May 5 the 51.25 GHz had a slight change in the calibration. The resulting LWP computed by using all 6 channels increased of about 0.025 mm (25 g/m2). |
| Measurements: | nimmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/01/2006 | 0000 | 08/31/2006 | 2359 |
| Subject: | NIM/MWRP/M1 - Sun in radiometer's field of view |
| DataStreams: | nimmwrpM1.b1 |
| Description: | Around noon local time every day there is a spike in the brightness temperature data. This is due to the sun being in the field of view of the radiometer. PWV and LWP are affected as a consequence |
| Measurements: | nimmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/09/2006 | 0001 | 06/07/2006 | 1900 |
| Subject: | NIM/MWRP/M1 - IRTs do not agree with AERI |
| DataStreams: | nimmwrpM1.b1 |
| Description: | Since deployment at PYE, and then at NIM, the AMF SKYRAD IRT measured about 10K higher sky temperatures than the AERI and the MWRP IRT measured about 20K higher than the AERI. Several actions were taken to diagnose the problem including confirming the correct configuration of the IRTs and data logger, cleaning the mirror and lens, and replacing the mirror. After several days of rain beginning 6/2/2006, the three instruments came into agreement. The cause of the discrepancy was probably dust accumulation on the lens of the instrument |
| Measurements: | nimmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/01/2006 | 0000 | 11/27/2006 | 1200 |
| Subject: | NIM/MFRSR/M1 - Shading problem |
| DataStreams: | nimmfrsrM1.00, nimmfrsrM1.a0, nimmfrsrM1.b1 |
| Description: | The start time for this shading problem is very loose. Due to the near constant dusty conditions, it is very difficult to ascertain exactly when a shading problem begins. There are subtle hints of it in early to mid Oct, but it isn't until the end of the month when we can say with some certainty that there is a shading issue. Maintenance on 11/27/2006 resolved the problem. |
| Measurements: | nimmfrsrM1.a0:
nimmfrsrM1.b1:
nimmfrsrM1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/01/2006 | 0000 | 11/17/2006 | 1713 |
| Subject: | NIM/MWRP/M1 - Reprocessed: K-band calibration drift corrected |
| DataStreams: | nimmwrpM1.b1 |
| Description: | During October and November there was a drift in the K-Band calibration of the MWRP. This resulted in brightness temperatures that were too high. New calibration coefficients were derived from the median value of the noise diode temperature for the months of October and November and the data were reprocessed to apply the corrected calibrations. The reprocessed data were archived in January 2007. |
| Measurements: | nimmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/22/2006 | 1045 | 03/23/2006 | 1000 |
| Subject: | NIM/AOS/M1 - Bypass valve failure |
| DataStreams: | nimaosM1.a1, nimaosauxM1.a1, nimaosccnM1.a1 |
| Description: | The flow bypass valve failed which routed flow through the bypass line rather than through the instruments. The bypass line was capped the next day. The valve was replaced on 4/19. Data is considered unusable during the time between the valve failure on 3/22 and the capping of the flow line on 3/23. |
| Measurements: | nimaosccnM1.a1:
nimaosM1.a1:
nimaosauxM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/23/2006 | 1000 | 05/04/2006 | 1800 |
| Subject: | NIM/AOS/M1 - Impactor switch stuck in 10 micron mode |
| DataStreams: | nimaosM1.a1 |
| Description: | A wire came loose in the ball valve that switches between the two impactor size cuts. The impactor was stuck on the sub 10 micron size cut during this period of time. There was no data from the sub 1 micron size cut during this time. |
| Measurements: | nimaosM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/04/2006 | 1800 | 08/11/2006 | 1445 |
| Subject: | NIM/AOS/M1 - Flow controller failure |
| DataStreams: | nimaosM1.a1, nimaosauxM1.a1, nimaosccnM1.a1 |
| Description: | Following a power outage at the site both a PID controller for the main sample flow as well as a circuit board on the reference nephelometer were inoperable. The PID controller was replaced on 5/18 and the neph circuit board was replaced on 6/22. On a site visit in August the mentor found the PID had not been programmed correctly and was reading erroneous flows. The actual flow was at 50% of the recorded flow. Because the sample flow is diluted by 50% this makes most if not all of the sample flow from 5/18 to 8/11 from the diluter. |
| Measurements: | nimaosccnM1.a1:
nimaosM1.a1:
nimaosauxM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/04/2006 | 0155 | 09/07/2006 | 0950 |
| Subject: | NIM/AOS/M1 - CCN failure |
| DataStreams: | nimaosccnM1.a1 |
| Description: | The tech noticed that the CCN temperature wasn't stepping correctly and that there wasn't much signal. He was able to find and correct the problem by 9/7. |
| Measurements: | nimaosccnM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/13/2006 | 0749 | 05/18/2006 | 1044 |
| 11/17/2006 | 0836 | 11/22/2006 | 0025 |
| Subject: | NIM/AOS/M1 - Missing data |
| DataStreams: | nimaosM1.a1, nimaosauxM1.a1, nimaosccnM1.a1 |
| Description: | Data are missing and unrecoverable. |
| Measurements: | nimaosccnM1.a1:
nimaosM1.a1:
nimaosauxM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/2006 | 0000 | 01/06/2007 | 2359 |
| Subject: | NIM/MET/M1 - ORG underestimated precipitation |
| DataStreams: | nimmetM1.b1 |
| Description: | The ORG underestimated precipitation by about 38% during the entire NIM deployment. No troubleshooting technique or replacement of gauge was successful in correcting the problem. |
| Measurements: | nimmetM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/2006 | 0000 | 01/07/2007 | 2359 |
| Subject: | NIM/MET/M1 - Wind Speed data contain offset due to induced voltage |
| DataStreams: | nimmetM1.b1 |
| Description: | The marine model of the RM Young wind sensor needs twisted pair shielded cable. The manufacturer did not originally supply the pigtail with twisted pair shielded cable. Use of twisted pair shielded cable for the rest of the cable run to the logger was also not specified. This caused an induced voltage in the wind speed line from the wind direction excitation. The induced voltage varied from sensor to sensor and probably changed anytime the cable was replaced or parts of the wind sensor were repaired or replaced. The induced voltage has been seen to vary from 0.15 m/s to as much as 1.08 m/s. |
| Measurements: | nimmetM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/31/2006 | 0000 | 07/31/2006 | 2359 |
| Subject: | NIM/MET/M1 - PWD cumulative precipitation incorrect |
| DataStreams: | nimmetM1.b1 |
| Description: | The Present Weather Detector is a serial sensor. The MET system datalogger reads in the data from this sensor. During the time in question serial comms problems were causing the data from the sensor to be read incorrectly. The data for one variable showed up in data for another variable or not at all. We reprocessed the data to correct as much of this error as we could. The cumulative rainfall variable was calculated from the instantaneous rainfall variable during reprocessing. Since we cannot be entirely sure all cumulative rainfall values are correct or were completely captured the cumulative rainfall data is considered to be unreliable. This issue shows up when comparing the cumulative rainfall data at the end of the day 07/31/2006 (79.08) and the beginning of the next day 08/01/2006 (3.17). Clearly we were either under or over-estimating the cumulative rainfall. |
| Measurements: | nimmetM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/31/2006 | 0000 | 07/31/2006 | 2359 |
| Subject: | NIM/MET/M1 - PWD 1 minute rainfall data suspect |
| DataStreams: | nimmetM1.b1 |
| Description: | The Present Weather Detector is a serial sensor. The MET system datalogger reads in the data from this sensor. During the time in question serial comms problems were causing the data from the sensor to be read incorrectly. The data for one variable showed up in data for another variable or not at all. We reprocessed the data to correct as much of this error as we could. We cannot be entirely certain that all rainfall values are correct or were captured properly. It is possible that some values were missed completely. |
| Measurements: | nimmetM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/21/2005 | 0000 | 12/31/2006 | 0000 |
| Subject: | NIM/AOS/M1 - Data processing problem |
| DataStreams: | nimaosM1.a1, nimnoaaaosM1.b1, nimnoaaaosavgM1.b1 |
| Description: | The AOS data was reprocessed for the AMF, SGP and NSA sites. There was an error in the processing of the corrections for the PSAP absorption signal such that a low pass filter was implemented for the scattering data used in these corrections.The difference between the corrected and previous data is < 0.05 Mm-1 (below the instrument detection limit) and should not have a significant effect on the previous data. Data will be reprocessed at a later time when more significant changes to the data processing are implemented. |
| Measurements: | nimnoaaaosavgM1.b1:
nimaosM1.a1:
nimnoaaaosM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/20/2005 | 0000 | 01/05/2006 | 2359 |
| Subject: | NIM/MET/M1 - Deployment period |
| DataStreams: | nimmetM1.b1 |
| Description: | All data from the met tower are suspect during this time period as the systems were being deployed and in various states of operation. |
| Measurements: | nimmetM1.b1:
|