| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D060419.3 | NIM/MWRP/M1 - Instrument noise problem | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
| D060419.4 | NIM/MWR/M1 - Instrument noise problem/RF interference | nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1 |
| D060530.1 | NIM/ECOR/M1 - Flux Data Suspect for Some Wind Directions | nim30ecorM1.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 |
| D060718.1 | NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating. | nimmwrlosM1.b1, nimmwrtipM1.a1 |
| D070215.5 | NIM/ECOR/M1 - Effects on ECOR CO2 Flux and Concentration By Aircraft | nim30ecorM1.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: | nimmwrprawM1.00:
nimmwrpM1.b1:
nimmwrpM1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/15/2006 | 0000 | 01/08/2007 | 0000 |
| Subject: | NIM/MWR/M1 - Instrument noise problem/RF interference |
| DataStreams: | nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1 |
| Description: | Data are affected by intermittent spikes that become more frequent starting in March 2006. Spikes affect data mostly around 9 AM and 18:00 PM. The origin of the spikes is probably RF interference. |
| Measurements: | nimmwrlosM1.b1:
nimmwrM1.00:
nimmwrtipM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/26/2005 | 1530 | 01/07/2007 | 2359 |
| Subject: | NIM/ECOR/M1 - Flux Data Suspect for Some Wind Directions |
| DataStreams: | nim30ecorM1.b1 |
| Description: | NIM: For some wind directions the horizontal fetch was not representative of the field in which the AMF was located. Therefore, for the wind direction ranges 90-170 (buildings) and 220-280 (trees) degrees, the fluxes are affected by insufficient fetch and surfaces, buildings, or vegetation that are not similar to the local field conditions. |
| Measurements: | nim30ecorM1.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 |
|---|---|---|---|
| 03/01/2006 | 0000 | 01/08/2007 | 0000 |
| Subject: | NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating. |
| DataStreams: | nimmwrlosM1.b1, nimmwrtipM1.a1 |
| Description: | The radiometer was intermittently thermally unstable resulting in poor calibrations for four brief time periods. These data have been reprocessed to apply corrected calibrations. The affected time periods were: 20060302-20060303 20060423-20060425 20060512-20060515 20060531-20060603 |
| Measurements: | nimmwrlosM1.b1:
nimmwrtipM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/26/2005 | 1530 | 01/07/2007 | 2330 |
| Subject: | NIM/ECOR/M1 - Effects on ECOR CO2 Flux and Concentration By Aircraft |
| DataStreams: | nim30ecorM1.b1 |
| Description: | Aircraft landings, departures, and running aircraft on the airport pad were found to produce large spikes in the half hourly CO2 flux and small spikes in CO2 concentration on many days during the entire deployment of the AMF at NIM. This influence was found on 40% of the days in March and April 2006 and sometimes for multiple periods in a day; this was typical of the year of data. The spikes range from only several micromoles s-1 m-2 to one hundred or more for flux (a typical spike was in the twenties) and near zero to 1.0 mmoles m-3 for CO2 concentration (typically around 0.15). The aircraft influence was caused by persistent easterly winds; the airport terminal pad and the nearest part of the runway were almost directly to the east of the ECOR location. Occasionally an influence on water vapor density was detected, but this was fairly rare and usually of very small magnitude. |
| Measurements: | nim30ecorM1.b1:
|