| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000203.3 | SGP/AOS/C1 - CN counter removed | sgpaosC1.a0 |
| D000801.4 | SGP/AOS/C1 - Nephelometer failure | sgpaosC1.a0, sgpaosauxC1.a0 |
| D000801.5 | SGP/AOS/C1 - Nephelometer failure | sgpaosC1.a0, sgpaosauxC1.a0 |
| D020709.3 | SGP/AOS/C1 - AOS Computer Failure | sgpaosC1.a0, sgpaosauxC1.a0 |
| D021007.1 | SGP/AOS/C1 - Ozone instrument out of service | sgpaosC1.a0, sgpaosauxC1.a0 |
| D030210.1 | SGP/AOS/C1 - Data missing | sgpaosC1.00, sgpaosC1.a0, sgpaosauxC1.a0 |
| D040130.1 | SGP/AOS/C1 - Ozone Instrument removed for repair | sgpaosC1.a0, sgpaosauxC1.a0 |
| D041026.3 | SGP/AOS/C1 - PCASP instrument problem | sgpaosC1.a0, sgpaosauxC1.a0 |
| D041026.4 | SGP/AOS/C1 - Ozone instrument removed for repair | sgpaosC1.a0, sgpaosauxC1.a0 |
| D041026.5 | SGP/AOS/C1 - Condensation Particle Counter failure | sgpaosC1.a0, sgpaosauxC1.a0 |
| D041026.6 | SGP/AOS/C1 - Wet nephelometer problems | sgpaosC1.a0, sgpaosauxC1.a0 |
| D050120.2 | SGP/AOS/C1 - Failed RH sensor | sgpaosC1.a0 |
| D050401.1 | SGP/AOS/C1 - wet nephelometer out of service | sgpaosC1.a0 |
| D051024.4 | SGP/AOS/C1 - Nephelometer calibration drift | sgpaosC1.a0, sgpaosauxC1.a0 |
| D060906.2 | SGP/AOS/C1 - Missing Condensation Nuclei Counter data | sgpaosC1.a0 |
| D070420.1 | SGP/AOS/C1 - Humidifier controller failure | sgpaosC1.00, sgpaosC1.a0, sgpaosauxC1.a0 |
| D070905.2 | SGP/AOS/C1 - CPC failure | sgpaosC1.a1 |
| D090120.5 | SGP/AOS/C1 - Pump failure and subsequent failure of humidified nephelometer | sgpaosC1.a1 |
| 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 |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 06/20/2000 | 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 |
|---|---|---|---|
| 05/23/2002 | 2011 | 05/26/2002 | 2033 |
| 05/27/2002 | 0232 | 05/28/2002 | 1439 |
| 05/29/2002 | 0258 | 05/29/2002 | 1516 |
| 05/29/2002 | 2159 | 05/30/2002 | 1113 |
| 05/31/2002 | 2310 | 06/04/2002 | 1447 |
| Subject: | SGP/AOS/C1 - AOS Computer Failure |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The AOS computer started to experience periodic failures caused by an aging and failing system disk. Replacement of the AOS computer's system disk occurred between 2-4 June 2002. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/30/2002 | 0000 | 10/01/2002 | 1934 |
| Subject: | SGP/AOS/C1 - Ozone instrument out of service |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The ice storm of 30-31 January, 2002 shut down the AOS for ~2 weeks. A controlled power-up of the system found a problem with the ozone monitor. Smoke was observed to come from the ozone instrument, at which time it was shut down. The ozone monitor was removed from the AOS for remote troubleshooting. The cause of the smoke was identified as being from underneath a printed circuit board. At that point, Site Ops staff were requested to send the unit to Boulder for additional troubleshooting. NOAA staff received the unit on 20 February 2002. After a brief inspection, the cause of the smoking was discovered. A one-half inch hole was burned completely through the motherboard. The determination was made that this could not be repaired at the NOAA facility, and a purchase order was initiated to return the unit to Dasibi, Inc. (the manufacturer), for repair/replacement of the motherboard. On 4 March, 2002, NOAA personnel received the OK from ARM to return the instrument to Dasibi, Inc. for service. Dasibi, Inc., received the unit on or around 8 March, 2002. The manufacturer was to test the unit, repair or replace the damaged motherboard, and calibrate the unit according to the NIST standard protocol. On 8 May, 2002, NOAA personnel emailed SGP Site Ops personnel and asked them to check on the status of the repair, which was taking longer then expected. Upon trying to contact the manufacturer, it was discovered that they went out of business. The return of instruments from the manufacturer to customers was being handled by a contract company. The ozone monitor arrived back in Boulder, in an unrepaired state, on or about 1 July 2002. Since there were few other options, NOAA personnel undertook the difficult task of repairing the motherboard. This required the re-routing of several electrical conduits from the burned area in the multilayer board to other acceptable places on the board. This took a considerable amount of electronics technician time and effort. After the motherboard was repaired, extensive testing was required to verify that the repair was done successfully and that other problems were not caused in the unit by the board burning.. The repair was deemed successful on 24 September, 2002. The unit was shipped back to the SGP site immediately thereafter. It was installed during a NOAA AOS maintenance visit on 1 October, 2002. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/27/2002 | 1805 | 12/31/2002 | 1543 |
| Subject: | SGP/AOS/C1 - Data missing |
| DataStreams: | sgpaosC1.00, sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The UPS supplying power to the AOS computer failed on Friday, 12/27/2002. The UPS was repaired on Monday 12/30/2002, but the AOS computer was locked up and would not reboot. Telephone communication was established with Richard Eagan, ANL, who was able to do a remote reboot of the computer using his account. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.00:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/21/2003 | 1636 | 01/27/2004 | 2208 |
| Subject: | SGP/AOS/C1 - Ozone Instrument removed for repair |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The ozone instrument was removed for calibration on 2003 11/21. It was shipped to Boulder and was cleaned and calibrated. It was sent back to SGP on 2003 12/02, but was damaged in transit by FedEx. The instrument was reinstalled on 2003 12/03 but was found to be defective. Large spikes were observed in the data. Afetr a few days the instrument was removed and shipped to a vendor for repair. The ozone monitor was returned to service after repair at 2004 01/27 (2208 GMT). |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/10/2004 | 0000 | 10/26/2004 | 1200 |
| Subject: | SGP/AOS/C1 - PCASP instrument problem |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | PCASP (optical particle counter) gave unusually low aerosol signal counts despite numerous attempts to fix the instrument by the mentor and manufacturer. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/21/2003 | 1600 | 01/28/2004 | 0000 |
| Subject: | SGP/AOS/C1 - Ozone instrument removed for repair |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The ozone monitor was removed and sent back to the manufacturer for repair. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/28/2004 | 1400 | 08/27/2004 | 1540 |
| Subject: | SGP/AOS/C1 - Condensation Particle Counter failure |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The CPC signal declined to a low value. The instrument was shipped back to the mentor, cleaned and repaired. The instrument inlet was clogged. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/24/2004 | 0000 | 02/18/2004 | 1800 |
| Subject: | SGP/AOS/C1 - Wet nephelometer problems |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The humidifier tube was coated with mold and had to be replaced. This affects the wet nepheleometer measurements and the calculations of the aerosol hygroscopic growth. The humidifer was cleaned and replaced. A filter was added to the water circulation to minimize mold. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/2004 | 0000 | 05/01/2005 | 2359 |
| Subject: | SGP/AOS/C1 - Failed RH sensor |
| DataStreams: | sgpaosC1.a0 |
| Description: | The RH sensor inside the humidified nephelometer began to slowly decline in value in the upper RH range beginning in early 2004 and becoming more noticable poor on 20041117. The sensor currently reaches a high RH value of about 60% when the actual RH is closer to 80%. The sensor was replaced in the Spring of 2005, but the problem remained. Effective 1/1/2004, this sensor is not used to calculate scientific data and is therefore essentially abandoned in the field. An end-date of 20050501 is being used as a placeholder. |
| Measurements: | sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/04/2005 | 0000 | 03/22/2005 | 1955 |
| Subject: | SGP/AOS/C1 - wet nephelometer out of service |
| DataStreams: | sgpaosC1.a0 |
| Description: | The humidified nephelometer was removed and shipped back to CMDL to test and work on the relative humidity sensor inside the instrument. |
| Measurements: | sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/14/2005 | 1536 | 10/28/2005 | 1940 |
| Subject: | SGP/AOS/C1 - Nephelometer calibration drift |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | Bad span check on the humidified nepehelometer. Instrument was recalibrated and returned to service on 10/28/2005 at 1940 UTC. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/31/2006 | 1355 | 09/11/2006 | 1900 |
| Subject: | SGP/AOS/C1 - Missing Condensation Nuclei Counter data |
| DataStreams: | sgpaosC1.a0 |
| Description: | AOS Condensation Nuclei Counter stopped detecting particle counts and was returned to mentor for cleaning. The instrument has small orifices and has a tendency to clog. |
| Measurements: | sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/27/2007 | 1912 | 04/12/2007 | 2107 |
| Subject: | SGP/AOS/C1 - Humidifier controller failure |
| DataStreams: | sgpaosC1.00, sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | Watlow PID controller which controls the humidifier stopped working. This mostly affects calculated fits of fRH |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.00:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/11/2007 | 0940 | 07/24/2007 | 2205 |
| 08/17/2007 | 2140 | 08/30/2007 | 1900 |
| Subject: | SGP/AOS/C1 - CPC failure |
| DataStreams: | sgpaosC1.a1 |
| Description: | The Condensation Particle Counter stopped recording counts. Upon inspection the tech found that water had condensed in the reservoir. The CPC was shipped back to the mentor for repair and a replacement CPC from NOAA was sent to the site. The replacement Condensation Particle Counter stopped measuring particle counts and was removed and returned to NOAA. The thermoelectric cooler in the device had stopped working. The ARM CPC that had previously been sent back to NOAA for repair was fixed and returned to SGP. |
| Measurements: | sgpaosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/19/2008 | 0112 | 01/06/2009 | 1912 |
| Subject: | SGP/AOS/C1 - Pump failure and subsequent failure of humidified nephelometer |
| DataStreams: | sgpaosC1.a1 |
| Description: | The pump for the aerosol sampling system failed over a weekend. The humidifier continued to operate and soaked the inside of both the reference and wet nephelometers. The nephelometers were returned for repair. A replacement neph was installed on 2008-August 5 @1858 UTC. The nephs were repaired and returned to SGP in December 2008. The humidification system was rebuilt and installed on 2009 January 6 at 1912 UTC. |
| Measurements: | sgpaosC1.a1:
|
| 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:
|