| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| 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 |
| D980528.1 | SGP/AOS/C1 - Optical Particle Counter (PCASP-X) down | sgpaosC1.a0, sgpaosauxC1.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 |
|---|---|---|---|
| 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:
|