| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000203.2 | SGP/AOS/C1 - Humidograph water circulation system failure | sgpaosC1.a0 |
| D000203.3 | SGP/AOS/C1 - CN counter removed | sgpaosC1.a0 |
| D000801.3 | SGP/AOS/C1 - Nephelometer failure | sgpaosC1.a0, sgpaosauxC1.a0 |
| D000801.4 | SGP/AOS/C1 - Nephelometer failure | sgpaosC1.a0, sgpaosauxC1.a0 |
| D000801.5 | SGP/AOS/C1 - Nephelometer failure | sgpaosC1.a0, sgpaosauxC1.a0 |
| D980505.1 | SGP/AOS/C1 - Annual Maintenance | sgpaosC1.a0 |
| D980528.1 | SGP/AOS/C1 - Optical Particle Counter (PCASP-X) down | sgpaosC1.a0, sgpaosauxC1.a0 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/02/1999 | 2300 | 01/15/2000 | 0000 |
| Subject: | SGP/AOS/C1 - Humidograph water circulation system failure |
| DataStreams: | sgpaosC1.a0 |
| Description: | The water circulation system for the AOS humidograph failed. Consequently, the humidified nephelometer was reporting aerosol light scattering values during this period that were close to what the reference nephelometer was observing. The difference between the two sets of measurements reflect particle losses in the humidifier and different temperature environments for the two instruments. Humidified nephelometer data during this period are technically valid, they just do not reflect relative humidity scans (the normal operating mode). |
| Measurements: | sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/16/1999 | 0448 | 01/15/2000 | 0000 |
| 07/08/2002 | 1131 | 08/05/2002 | 1424 |
| Subject: | SGP/AOS/C1 - CN counter removed |
| DataStreams: | sgpaosC1.a0 |
| Description: | The AOS condensation particle counter performance degraded to unacceptable levels and was removed for repair. For the first time period: upon inspection of the internal condition of the instrument, it was found that oil was present in the intake line. It is unknown how this oil could have arrived in this position. The instrument was thoroughly cleaned and back-flushed, and returned to service during the maintenance visit. For the second time period: The degradation of began July 8th. Data collected during this time period are either incorrect or missing and should not be used. |
| Measurements: | sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/02/2000 | 1842 | 06/16/2000 | 2234 |
| Subject: | SGP/AOS/C1 - Nephelometer failure |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | An inexperienced AOS technician inadvertently closed off the flow to the dual-nephelometer humidograph system during a Friday Preventative Maintenance. This resulted in liquid water getting into the humidified nephelometer. Flow was restored to the system on Monday, but the nephelometers were producing strange data. A number of tests were performed over the next few days to remotely troubleshoot the situation, to no avail. Eventually, the decision was made to pull both nephelometers and return them to Boulder for repair. This DQR refers only to the reference nephelometer, which was out of service for 2 periods due to 2 separate problems. This DQR is for the first period, from 000602 (1842 GMT) to 000616 (2234 GMT). Light absorption are invalid whenever the reference nephelometer is not operational, because those data are required for correction of the absorption data. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/20/2000 | 1340 | 07/03/2000 | 1833 |
| Subject: | SGP/AOS/C1 - Nephelometer failure |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | An inexperienced AOS technician inadvertently closed off the flow to the dual-nephelometer humidograph system during a Friday Preventative Maintenance. This resulted in liquid water getting into the humidified nephelometer. Flow was restored to the system on Monday, but the nephelometers were producing strange data. A number of tests were performed over the next few days to remotely troubleshoot the situation, to no avail. Eventually, the decision was made to pull both nephelometers and return them to Boulder for repair. This DQR refers only to the reference nephelometer, which was out of service for 2 periods due to 2 separate problems. This DQR is for the second period, from 000620 (1340 GMT) to 000703 (1833 GMT). Light absorption measurements are invalid whenever the reference nephelometer is not operational, because those data are required for correction of the absorption data. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/02/2000 | 1842 | 07/03/2000 | 1833 |
| Subject: | SGP/AOS/C1 - Nephelometer failure |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | An inexperienced AOS technician inadvertently closed off the flow to the dual-nephelometer humidograph system during a Friday Preventative Maintenance. This resulted in liquid water getting into the humidified nephelometer. Flow was restored to the system on Monday, but the nephelometers were producing strange data. A number of tests were performed over the next few days to remotely troubleshoot the situation, to no avail. Eventually, the decision was made to pull both nephelometers and return them to Boulder for repair. This DQR refers only to the humidified nephelometer, which was out of service for the entire period from 000602 through 000703. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/04/1997 | 1459 | 08/08/1997 | 1348 |
| 04/20/1998 | 1449 | 04/23/1998 | 2136 |
| 07/19/1999 | 1452 | 07/30/1999 | 1829 |
| 01/10/2000 | 1400 | 01/15/2000 | 0000 |
| 09/30/2002 | 1300 | 10/04/2002 | 1900 |
| 03/17/2003 | 1547 | 03/21/2003 | 2248 |
| Subject: | SGP/AOS/C1 - Annual Maintenance |
| DataStreams: | sgpaosC1.a0 |
| Description: | The AOS Annual maintenance/calibration visit occurred during these periods. During these times, instruments were cleaned, calibrated, and when necessary, repaired. Instruments were online collecting data for some of the time; however, periods of contamination are probable because aerosol sampling lines were opened for inspection and cleaning and pumps were switched off for periods of time. Any data fields during this period that contain data should be considered incorrect. |
| Measurements: | sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/01/1997 | 0936 | 07/03/1997 | 1556 |
| 08/01/1997 | 1329 | 08/08/1997 | 1348 |
| 05/05/1998 | 0926 | 06/16/1998 | 1505 |
| 06/09/1999 | 0824 | 07/26/1999 | 2205 |
| 09/08/2000 | 0426 | 10/13/2000 | 1630 |
| 05/17/2002 | 0602 | 05/20/2005 | 1847 |
| 05/23/2002 | 2011 | 05/31/2002 | 1258 |
| 09/09/2002 | 0000 | 10/07/2002 | 1905 |
| Subject: | SGP/AOS/C1 - Optical Particle Counter (PCASP-X) down |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The AOS Optical Particle Spectrometer (PCASP-X sizing probe) was down during these periods. This lowers the laser reference voltage and results in inaccurate sizing. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|