DQR ID | Subject | Data Streams Affected |
---|---|---|
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 |
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 |
D041118.1 | SGP/AOS/C1 - MainAirFlow sensor error | sgpaosauxC1.a0 |
D980527.4 | SGP/AOS/C1 - Condensation Particle Counter failure | sgpaosC1.a0, sgpaosauxC1.a0 |
D980528.1 | SGP/AOS/C1 - Optical Particle Counter (PCASP-X) down | sgpaosC1.a0, sgpaosauxC1.a0 |
D980528.10 | SGP/AOS/C1 - Instrument communications problems | sgpaosC1.a0, sgpaosauxC1.a0 |
D980528.2 | SGP/AOS/C1 - 3-wavelength nephelometer data missing | sgpaosC1.a0, sgpaosauxC1.a0 |
D980528.6 | SGP/AOS/C1 - Ozone instrument left in span mode | sgpaosC1.a0, sgpaosauxC1.a0 |
D980528.7 | SGP/AOS/C1 - Line 8 bypass in wrong position | sgpaosC1.a0, sgpaosauxC1.a0 |
D980528.8 | SGP/AOS/C1 - Light absorption photometer (PSAP) error | sgpaosC1.a0, sgpaosauxC1.a0 |
D980528.9 | SGP/AOS/C1 - Ozone Instrument Communication Failure | sgpaosC1.a0, sgpaosauxC1.a0 |
D980529.1 | SGP/AOS/C1 - Ozone Instrument data incorrect | sgpaosC1.a0, sgpaosauxC1.a0 |
D980731.1 | SGP/AOS/C1 - Aerosol sampling system and nephelometer failure | sgpaosC1.a0, sgpaosauxC1.a0 |
D981203.1 | SGP/AOS/C1 - 3-wavelength nephelometer data missing | sgpaosC1.a0, sgpaosauxC1.a0 |
D990611.1 | SGP/AOS/C1 - Ozone Instrument Failure | sgpaosC1.a0, sgpaosauxC1.a0 |
D990614.1 | SGP/AOS/C1 - Invalid absorption data | sgpaosC1.a0, sgpaosauxC1.a0 |
D990809.1 | SGP/AOS/C1 - Ozone instrument error | sgpaosC1.a0, sgpaosauxC1.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 |
---|---|---|---|
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 |
---|---|---|---|
07/20/2000 | 1630 | 05/16/2001 | 1430 |
Subject: | SGP/AOS/C1 - MainAirFlow sensor error |
DataStreams: | sgpaosauxC1.a0 |
Description: | The MainAirFlow in the sgpaosauxC1.a0 data files is negative during this period. This should not occur. Nevertheless, the scattering and absorption data from the corresponding sgpaosC1.a0 files are fine, so the system was certainly running and the problem was likely just in the sensor that measured the flow. |
Measurements: | sgpaosauxC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/30/1997 | 0707 | 07/08/1997 | 1946 |
08/27/1997 | 1400 | 09/16/1997 | 1355 |
Subject: | SGP/AOS/C1 - Condensation Particle Counter failure |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | During the time periods specified, the AOS Condensation Particle Counter was down for maintenance. |
Measurements: | sgpaosauxC1.a0:
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:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/12/1997 | 2023 | 12/15/1997 | 1834 |
Subject: | SGP/AOS/C1 - Instrument communications problems |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | Several of the AOS instruments apparently lost communications with the AOS computer during this period. These instruments were the TSI 3-wavelength nephelometer, the PSAP light absorption photometer, and the Dasibi ozone instrument. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/29/1997 | 1340 | 07/31/1997 | 2236 |
Subject: | SGP/AOS/C1 - 3-wavelength nephelometer data missing |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | The AOS TSI 3-wavelength nephelometer lost communications with the AOS data system during this period. Cause of the communications break is unknown. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/29/1997 | 1348 | 09/02/1997 | 1326 |
Subject: | SGP/AOS/C1 - Ozone instrument left in span mode |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | AOS Ozone instrument was left in span mode over the weekend. Span value was logged during this period. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/15/1997 | 1540 | 09/16/1997 | 1420 |
Subject: | SGP/AOS/C1 - Line 8 bypass in wrong position |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | The Line 8 bypass valve was stuck in the wrong position. Consequently, air was not being drawn through the TSI 3-wavelength nephelometer and the PSAP light absorption photometer, and thus they were not measuring ambient (outdoor) aerosols. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/23/1997 | 1440 | 09/24/1997 | 1700 |
Subject: | SGP/AOS/C1 - Light absorption photometer (PSAP) error |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | The AOS continuous light absorption photometer (PSAP) showed inaccurate data during this period due to a filter being inserted into the optical assembly incorrectly. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/28/1997 | 2030 | 12/01/1997 | 1514 |
03/20/1998 | 1849 | 03/23/1998 | 2147 |
Subject: | SGP/AOS/C1 - Ozone Instrument Communication Failure |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | The AOS Ozone instrument apparently lost communications with the AOS computer during these periods. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/02/1998 | 1634 | 01/08/1998 | 1634 |
Subject: | SGP/AOS/C1 - Ozone Instrument data incorrect |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | A filter of the wrong type was placed in the ozone instrument intake line. This filter destroys ozone, and consequently the measured ozone values during this period are abnormally low. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/10/1998 | 0435 | 07/28/1998 | 2053 |
Subject: | SGP/AOS/C1 - Aerosol sampling system and nephelometer failure |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | The electronic valve that switches the aerosol sampling system from sampling the total aerosol (D<10 um) to the submicrometer (D<1 um) aerosol began having intermittent positioning problems. All 3-wavelength nephelometer and light absorption photometer data collected during this time period should be viewed as suspect, since we can't be sure what particle size range was being sampled at any time. During this interval, the nephelometer lamp became unstable and finally blew, giving no nephelometer data for the end of this period. The period of lamp failure in the AOS data files can be recognized by prolonged periods of missing value codes for aerosol scattering and nephelometer housekeeping channels. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/05/1998 | 1558 | 11/12/1998 | 0501 |
Subject: | SGP/AOS/C1 - 3-wavelength nephelometer data missing |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | The AOS data system lost communications initially with the 3-wavelength TSI nephelometer. A communications port on the Sun workstation became locked, and attempts to unlock it were unsuccesful. Stopping and restarting the data collection software did not solve the problem. Missing value codes were being generated for all TSI nephelometer measurements and parameters. The decision was made to reboot the workstation. On 981110, at 1555 GMT, the workstation was rebooted. We discovered then that we did not have the proper root user password to log back onto the system and restart the software. From 981110 (1555GMT) to 981112 (0501GMT) no data were being logged by the AOS data system. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/07/1999 | 1556 | 05/14/1999 | 1445 |
Subject: | SGP/AOS/C1 - Ozone Instrument Failure |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | A malfunction occurred with the AOS surface ozone instrument during the period 990507 1556 GMT to 990514 1445 GMT. The instrument reported an ozone concentration of 9.91e-01 ppm (991 ppb) continuously during this time. Quality checking of the data the following week revealed that the problem began at about the time weekly maintenance check was made on Friday. The problem continued until the next weekly maintenance check was done. Site Ops was notified by the mentor of the problem on Friday, 5/14/99, and a technician was sent to inspect the system. No switches on the instrument front panel were found in the wrong position (for example, if the instrument was inadvertantly left in a calibration mode). By the time the technician arrived at the trailer, the instrument appeared to be working correctly. No explanation is given as to why these erroneous values were being generated by the ozone instrument, except that possibly it locked up with the throwing of the weekly preventative maintenance switch and this problem was not corrected until the same switch was thrown the following week. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/21/1999 | 1413 | 05/27/1999 | 1819 |
Subject: | SGP/AOS/C1 - Invalid absorption data |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | During the period noted, a valve position error with the 1-um/10-um impactor switching valve occurred. The result of this error was to invalidate all switched data. The software correctly inserted missing value codes in the nephelometer data, but the PSAP light absorption photometer for some reason reported a constant value over this period. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/18/1999 | 1628 | 06/22/1999 | 1537 |
06/25/1999 | 1630 | 06/28/1999 | 1343 |
Subject: | SGP/AOS/C1 - Ozone instrument error |
DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
Description: | A switch on the front panel of the ozone instrument was left in the wrong position. This resulted in a bad value for ozone concentration being logged for these periods. |
Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|