| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D060307.1 | NIM/MWRP/M1 - Software problem | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
| 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 |
| 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 |
| D061117.1 | NIM/MWRP/M1 - Reprocessed: K-band calibration drift corrected | nimmwrpM1.b1 |
| 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 |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 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 | 11/17/2006 | 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:
|