| 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 |
| D070628.1 | FKB/MWRP/M1 - Reprocess: Incorrect calibration | fkbmwrpM1.b1 |
| D071009.1 | FKB/MWRP/M1 - LN2 Calibration- | fkbmwrpM1.b1 |
| D071016.1 | FKB/MWRP/M1 - Reprocess: Updated 30-GHz calibration coefficient | fkbmwrpM1.b1 |
| D071207.1 | FKB/MWRP/M1 - Heavy rain and fog at the site | fkbmwrpM1.b1 |
| D080116.1 | FKB/MWRP/M1 - Possible slight drift of V-band calibration | fkbmwrpM1.b1 |
| D080116.2 | FKB/MWRP/M1 - Periodic decrease in the 30-GHz brightness temperature | fkbmwrpM1.b1 |
| D080211.4 | NSA/MWRP/C1 - Radiometer thermally unstable | nsamwrpC1.b1 |
| D080319.1 | NSA/MWRP/C1 - Hardware failure- Intermittent data | nsamwrpC1.b1 |
| D080319.2 | NSA/MWRP/C1 - Missing data | nsamwrpC1.b1 |
| D080319.3 | NSA/MWRP/C1 - Thermal instability- TKnd test | nsamwrpC1.b1 |
| D080710.2 | NSA/MWRP/C1 - Reprocess: LN2 calibration needed | nsamwrpC1.b1 |
| D080922.2 | NSA/MWRP/C1 - V-band noise diode failure | nsamwrpC1.b1 |
| D081107.1 | NSA/MWRP/C1 - Incorrect V-band data | nsamwrpC1.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: | nimmwrprawM1.00:
nimmwrpM1.b1:
nimmwrpM1.00:
|
| 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: | nimmwrprawM1.00:
nimmwrpM1.b1:
nimmwrpM1.00:
|
| 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: | nimmwrprawM1.00:
nimmwrpM1.b1:
nimmwrpM1.00:
|
| 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:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/20/2007 | 0520 | 06/21/2007 | 2000 |
| Subject: | FKB/MWRP/M1 - Reprocess: Incorrect calibration |
| DataStreams: | fkbmwrpM1.b1 |
| Description: | The software was started with the wrong calibration data. |
| Measurements: | fkbmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/17/2007 | 1100 | 09/17/2007 | 1500 |
| Subject: | FKB/MWRP/M1 - LN2 Calibration- |
| DataStreams: | fkbmwrpM1.b1 |
| Description: | Between 1100 and 1500 there were two calibration attempts. |
| Measurements: | fkbmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/17/2007 | 1500 | 10/09/2007 | 1840 |
| Subject: | FKB/MWRP/M1 - Reprocess: Updated 30-GHz calibration coefficient |
| DataStreams: | fkbmwrpM1.b1 |
| Description: | On 9/17 the instrument was calibrated with liquid nitrogen. For the 30-GHz channel the results of calibration were not optimal and were causing a negative bias in the retrieved LWP. On 10/9 the 30-GHz calibration parameters were updated with values derived from tip curves. Data between 9/17 and 10/9 will be reprocessed to correct for the 30-GHz calibration. |
| Measurements: | fkbmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/06/2007 | 0000 | 12/15/2007 | 0000 |
| Subject: | FKB/MWRP/M1 - Heavy rain and fog at the site |
| DataStreams: | fkbmwrpM1.b1 |
| Description: | The months of November and December have been very rainy and wet at the AMF site. During rain events the radiometer does not work properly because of water accumulating on the window. In addition condensation and fog will affect the data causing very high brightness temperatures. Although the instrument is equipped with rain detection system to flag bad data, it is important that the user pays extra attention to the quality of the data during periods of continuous rain, drizzle or fog by applying the quality checks and screening for high brightness temperatures. |
| Measurements: | fkbmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/01/2007 | 0000 | 12/31/2007 | 2300 |
| Subject: | FKB/MWRP/M1 - Possible slight drift of V-band calibration |
| DataStreams: | fkbmwrpM1.b1 |
| Description: | During the month of November and December the bias between model computations and measurements for the 51.25 and 52.28 GHz channels has slightly increased to about 3 K. This might be due to a slight drift in the calibration of these channels. The calibration error associated with these data is increased, to 2-3 K, for these two months. See this plot for a comparison of measurements (solid lines) and model (red dots) for the 51.25 (black), 52.28 (blue) and 53.85-GHz (green) channels. |
| Measurements: | fkbmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/19/2007 | 0000 | 12/31/2007 | 0000 |
| Subject: | FKB/MWRP/M1 - Periodic decrease in the 30-GHz brightness temperature |
| DataStreams: | fkbmwrpM1.b1 |
| Description: | Starting around 12/19 until the end of December, the 30-GHz brightness temperature started to show a periodic oscillation between 9 and 11 AM GMT. The cause of this is probably thermal instability of the radiometer since it does correspond with some larger oscillations of the mixer temperature. During this time external temperatures displayed large variations going from -10 C at night to about +5 C during the day. The corresponding liquid water path retrievals are affected showing periodic negative values. Liquid water path retrievals between 12/19 and 12/31 are the most affected variable since they are largely affected by the 30-GHz channel. A time series plot of the data will clearly show the periodic fluctuation of the LWP variable. |
| Measurements: | fkbmwrpM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/2008 | 0000 | 01/31/2008 | 2300 |
| Subject: | NSA/MWRP/C1 - Radiometer thermally unstable |
| DataStreams: | nsamwrpC1.b1 |
| Description: | During January the radiometer was thermally unstable during several days of cold weather. The worst days of thermal instability were between Jan 12 and Jan 17. |
| Measurements: | nsamwrpC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/29/2008 | 0000 | 03/12/2008 | 0000 |
| Subject: | NSA/MWRP/C1 - Hardware failure- Intermittent data |
| DataStreams: | nsamwrpC1.b1 |
| Description: | Data are intermittent during this time due to a failure of the analog board. The calibration of V-band data may have slightly drifted due to power outages. |
| Measurements: | nsamwrpC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/12/2008 | 0100 | 04/09/2008 | 1539 |
| Subject: | NSA/MWRP/C1 - Missing data |
| DataStreams: | nsamwrpC1.b1 |
| Description: | The instrument was removed for repairs |
| Measurements: | nsamwrpC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/01/2008 | 0000 | 03/12/2008 | 0000 |
| Subject: | NSA/MWRP/C1 - Thermal instability- TKnd test |
| DataStreams: | nsamwrpC1.b1 |
| Description: | During this time the radiometer was thermally unstable . The noise diode physical temperature had sudden drops of more than 5 degree in several ccasions between 2/1 and 2/11. On 2/12 the radiometer temperature set point was lowered of about 10 degree as a test. On 2/27 a new analog board was installed in the instrument. Data after 2/27 show a slight change in calibration. |
| Measurements: | nsamwrpC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/01/2008 | 0000 | 07/18/2008 | 1950 |
| Subject: | NSA/MWRP/C1 - Reprocess: LN2 calibration needed |
| DataStreams: | nsamwrpC1.b1 |
| Description: | The V-band measurements are incorrect. The quantities affected are the temperature and humidity profiles. V-band data should not be used until the instrument is calibrated and data are reprocessed. The K-band data are acceptable. |
| Measurements: | nsamwrpC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/05/2008 | 0000 | 10/14/2008 | 1700 |
| Subject: | NSA/MWRP/C1 - V-band noise diode failure |
| DataStreams: | nsamwrpC1.b1 |
| Description: | The V-band noise diode is showing signs of instability. Starting about August 5 the comparison of brightness temperatures with model showed an increased divergence resulting from a downward trend in the brightness temperatures of frequencies > 50 GHz. Disregard brightness temperatures and retrieved products associated with the V-band channels. These include all profiles. Integrated water vapor and liquid water path are not affected. |
| Measurements: | nsamwrpC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/28/2008 | 2200 | 06/30/2008 | 2359 |
| Subject: | NSA/MWRP/C1 - Incorrect V-band data |
| DataStreams: | nsamwrpC1.b1 |
| Description: | The V-band channels show a drift during this time. |
| Measurements: | nsamwrpC1.b1:
|
