| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D030922.3 | NSA/MPL/C1 - laser head failure | nsamplC1.00, nsamplC1.a1, nsamplcmask1clothC1.c1, nsamplsmask1clothC1.c1 |
| D040124.1 | NSA/MPL/C1 - Laser Q-Switch Problem | nsamplC1.00, nsamplC1.a1, nsamplcmask1clothC1.c1, nsamplpsC1.a0, nsamplsmask1clothC1.c1 |
| D040229.1 | NSA/MPL/C1 - Instrument problem | nsamplC1.00, nsamplC1.a1, nsamplpsC1.a0 |
| D040426.3 | NSA/MPL/C1 - Hardware Failure/Missing Data | nsamplC1.00, nsamplC1.a1, nsamplcmask1clothC1.c1, nsamplsmask1clothC1.c1 |
| D050112.1 | NSA/C1 - Site-wide power failure | nsaaerich1C1.b1, nsaaerich2C1.b1, nsaaeriengineerC1.b1, nsaaerisummaryC1.b1, nsa915rwptempconC1.a1, nsa915rwptempmomC1.a0, nsa915rwptempspecC1.a0, nsa915rwpwindconC1.a1, nsa915rwpwindmomC1.a0, nsa915rwpwindspecC1.a0, nsamettwr4hC1.b1, nsammcrmomC1.b1, nsamplC1.a1, nsamplpsC1.a0, nsamwrlosC1.b1, nsamwrtipC1.a1, nsamwrpC1.b1, nsatwrcam40mC1.a1, nsavceil25kC1.b1 |
| D050215.5 | NSA/MPL/C1 - MPL clock drift | nsamplC1.a1, nsamplpsC1.a0 |
| D050608.1 | NSA/MPL/C1 - Diode failure | nsamplC1.a1, nsamplpsC1.a0 |
| D071022.3 | NSA/MPL/C1 - Bad Cross-Polarized data | nsamplpolC1.b1, nsamplpolavgC1.c1, nsamplpolavgC1.s1 |
| D080215.2 | NSA/MPL/C1/C2 - No cross polarization data | nsamplpolC1.b1, nsamplpolavgC1.c1, nsamplpolavgC1.s1 |
| D120228.2 | NSA/MPLCMASK/C1 - Cloud layer metadata misleading | nsa30smplcmask1zwangC1.c1 |
| D130712.3 | NSA/HSRL/C1 - Reprocess: Missing atten_beta_r_backscatter | nsahsrlC1.a1 |
| D130712.4 | NSA/HSRL/C1 - Degraded operation | nsahsrlC1.a1 |
| D130712.5 | NSA/HSRL/C1 - Missing data | nsahsrlC1.a1 |
| D130712.6 | NSA/HSRL/C1 - Instrument reinstallation | nsahsrlC1.a1 |
| D130712.7 | NSA/HSRL/C1 - Degraded operation, laser instability, dirty window | nsahsrlC1.a1 |
| D130712.8 | NSA/HSRL/C1 - Laser instability | nsahsrlC1.a1 |
| D131024.1 | NSA/HSRL/C1 - Instrument problem, Laser failure | nsahsrlC1.a1 |
| D131025.2 | NSA/HSRL/C1 - Filter wheel problem | nsahsrlC1.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/28/2002 | 0200 | 08/29/2002 | 0100 |
| Subject: | NSA/MPL/C1 - laser head failure |
| DataStreams: | nsamplC1.00, nsamplC1.a1, nsamplcmask1clothC1.c1, nsamplsmask1clothC1.c1 |
| Description: | On 2002-04-28 the laser energy was observed to decrease throughout the day. Although low clouds continued to be detected, by the end of the day the output laser energy was about 10% of nomimal. This decrease continued throughout 2002-04-29 to the extent that clouds were no longer detected. The source of failure was eventually determined to be the laser head, requiring the MPL to be shipped for repair. The MPL was reinstalled on 2002-08-28 at about 01:00 UTC. MPL NSA data from 2002-04-29 through 2002-08-27 (inclusive) should not be used. |
| Measurements: | nsamplC1.a1:
nsamplsmask1clothC1.c1:
nsamplcmask1clothC1.c1:
nsamplC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/19/2004 | 2252 | 01/24/2004 | 0016 |
| Subject: | NSA/MPL/C1 - Laser Q-Switch Problem |
| DataStreams: | nsamplC1.00, nsamplC1.a1, nsamplcmask1clothC1.c1, nsamplpsC1.a0, nsamplsmask1clothC1.c1 |
| Description: | At about 22:52 UTC on 2004/01/19, the NSA MPL appears to have suffered a temporary failure of the laser Q-Switch. This results in a complete loss of lidar data immediately thereafter. The problem was resolved (at least for the time being) by disconnecting and reconnecting the Q-Switch cable on 2004/01/24 at about 00:16 UTC. Data after this time appears good. |
| Measurements: | nsamplC1.a1:
nsamplsmask1clothC1.c1:
nsamplpsC1.a0:
nsamplcmask1clothC1.c1:
nsamplC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/18/2004 | 0830 | 02/24/2004 | 0830 |
| Subject: | NSA/MPL/C1 - Instrument problem |
| DataStreams: | nsamplC1.00, nsamplC1.a1, nsamplpsC1.a0 |
| Description: | On 2/18, the energy monitor on the MPL dropped from 11 microjoules per second to 2 microjoules per second. This severely affected data quality. This appears to be have been an intermittent cable problem for the laser Q-Switch. A new cable was provided and installed on 2-24. |
| Measurements: | nsamplC1.a1:
nsamplpsC1.a0:
nsamplC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/21/2003 | 0500 | 12/01/2003 | 1441 |
| Subject: | NSA/MPL/C1 - Hardware Failure/Missing Data |
| DataStreams: | nsamplC1.00, nsamplC1.a1, nsamplcmask1clothC1.c1, nsamplsmask1clothC1.c1 |
| Description: | Data are missing during this extended period due to a hardware failure. |
| Measurements: | nsamplC1.a1:
nsamplsmask1clothC1.c1:
nsamplcmask1clothC1.c1:
nsamplC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/13/2004 | 1000 | 12/13/2004 | 2330 |
| Subject: | NSA/C1 - Site-wide power failure |
| DataStreams: | nsaaerich1C1.b1, nsaaerich2C1.b1, nsaaeriengineerC1.b1, nsaaerisummaryC1.b1, nsa915rwptempconC1.a1, nsa915rwptempmomC1.a0, nsa915rwptempspecC1.a0, nsa915rwpwindconC1.a1, nsa915rwpwindmomC1.a0, nsa915rwpwindspecC1.a0, nsamettwr4hC1.b1, nsammcrmomC1.b1, nsamplC1.a1, nsamplpsC1.a0, nsamwrlosC1.b1, nsamwrtipC1.a1, nsamwrpC1.b1, nsatwrcam40mC1.a1, nsavceil25kC1.b1 |
| Description: | The Barrow facility experienced a site-wide power failure on 12/13. Power was restored to most instruments between 2250 and 2330 GMT. |
| Measurements: | nsa915rwpwindspecC1.a0:
nsa915rwpwindconC1.a1:
nsaaerich2C1.b1:
nsamwrlosC1.b1:
nsaaerisummaryC1.b1:
nsa915rwptempmomC1.a0:
nsaaerich1C1.b1:
nsamplpsC1.a0:
nsavceil25kC1.b1:
nsa915rwptempspecC1.a0:
nsa915rwptempconC1.a1:
nsaaeriengineerC1.b1:
nsamplC1.a1:
nsammcrmomC1.b1:
nsamettwr4hC1.b1:
nsamwrpC1.b1:
nsa915rwpwindmomC1.a0:
nsamwrtipC1.a1:
nsatwrcam40mC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/11/2003 | 0000 | 02/05/2004 | 0000 |
| Subject: | NSA/MPL/C1 - MPL clock drift |
| DataStreams: | nsamplC1.a1, nsamplpsC1.a0 |
| Description: | The MPL PC clock was noted to be off (slow) by more than an hour over a several day period. It has previously been noted that the time synchronization program "D-4" fails to update the PC clock under certain circumstances. As a result, the program "D-4" was replaced by "AboutTime" on 2/5/2004. The specifics of this problem are not well understood. It turns out that the instrument has TWO clocks on the instrument computer display - one being displayed by the MPL software and the other being the PC clock displayed in the lower right-hand corner of the screen. The MPL software clock was the one that is noted on daily rounds and was never off by any amount. Apparently the only clock that was off was the computer clock. What is clear is that between the time the MPL computer was installed on 11-11-2003 and the CM log on 1-06-2004 the MPL clock exhibited a discrepancy of over 1 hour and 20 minutes. What is not clear is whether this clock discrepancy was also applied to the data time stamps. Furthermore, seven days later the MPL clock exhibited only a 1.77 second drift. Not exceptional at all, and not in line with the previous discrepancy of more than 4800 seconds over a span of 57 days. Attempts to identify gradual correctible clock drift in the MPL data were not successful. As a worst-case scenario, the MPL data may be inappropriately time-stamped by as much a 1 hour 20 minutes and 41 seconds slow relative to UTC between the dates of 2003-11-11 and 2004-01-06. After this time until 2004-02-05 time synchronization was maintained within a few seconds a day with local observer assistance. |
| Measurements: | nsamplC1.a1:
nsamplpsC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/25/2005 | 1600 | 04/01/2005 | 2310 |
| Subject: | NSA/MPL/C1 - Diode failure |
| DataStreams: | nsamplC1.a1, nsamplpsC1.a0 |
| Description: | On 3/25, the energy monitor on the MPL dropped from 11 microjoules per second to 2 microjoules per second. We determined the problem was the diode; it reached the end of its lifetime. A replacement was sent. Data quality returned to normal. |
| Measurements: | nsamplC1.a1:
nsamplpsC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/23/2007 | 0330 | 06/19/2007 | 1700 |
| Subject: | NSA/MPL/C1 - Bad Cross-Polarized data |
| DataStreams: | nsamplpolC1.b1, nsamplpolavgC1.c1, nsamplpolavgC1.s1 |
| Description: | The polarizer box was not recycled when the system was rebooted; thus only circularly polarized light was being emitted. Ignore all cross polarized data. |
| Measurements: | nsamplpolavgC1.s1:
nsamplpolC1.b1:
nsamplpolavgC1.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/08/2008 | 1900 | 01/29/2008 | 2100 |
| Subject: | NSA/MPL/C1/C2 - No cross polarization data |
| DataStreams: | nsamplpolC1.b1, nsamplpolavgC1.c1, nsamplpolavgC1.s1 |
| Description: | Even though the polarization voltage was reported as switching between circular and cross polarization states, there was no cross polarization taking place because the polarization box had not been recycled following a system reboot. You will not be able to create depolarization values. However all other processes, such as cloud base determination should be ok. |
| Measurements: | nsamplpolavgC1.s1:
nsamplpolC1.b1:
nsamplpolavgC1.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/22/1998 | 0000 | 09/25/2006 | 2359 |
| Subject: | NSA/MPLCMASK/C1 - Cloud layer metadata misleading |
| DataStreams: | nsa30smplcmask1zwangC1.c1 |
| Description: | The comment in the header for cloud_base_layer indicates that a value of -1 indicates that no cloud is detected. For the specified time range, a value of 0 indicates that no cloud is detected. Values greater than zero indicate cloudy conditions, otherwise it is clear. |
| Measurements: | nsa30smplcmask1zwangC1.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/22/2013 | 0000 | 08/01/2013 | 2359 |
| Subject: | NSA/HSRL/C1 - Reprocess: Missing atten_beta_r_backscatter |
| DataStreams: | nsahsrlC1.a1 |
| Description: | Due to a processing error the atten_beta_r_backscatter variable is missing 100% of the time. This is not a critical problem as the rest of the subsequent derived fields are properly reported. Data will be reprocessed at a later date. |
| Measurements: | nsahsrlC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/08/2011 | 0000 | 12/04/2011 | 2359 |
| Subject: | NSA/HSRL/C1 - Degraded operation |
| DataStreams: | nsahsrlC1.a1 |
| Description: | The HSRL was suffering from operational issues following an enclosure overheating incident. Data continued to be collected, albeit with reduced power output, detection sensitivity, and calibration issues. It has utility for cloud and aerosol detection but must be used with caution. Heights and locations are quantitative and reliable, intensities are not. |
| Measurements: | nsahsrlC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/05/2011 | 0000 | 10/08/2012 | 2359 |
| Subject: | NSA/HSRL/C1 - Missing data |
| DataStreams: | nsahsrlC1.a1 |
| Description: | Data are missing and unrecoverable. |
| Measurements: | nsahsrlC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/09/2012 | 0000 | 10/12/2012 | 2359 |
| Subject: | NSA/HSRL/C1 - Instrument reinstallation |
| DataStreams: | nsahsrlC1.a1 |
| Description: | Instrument was being reinstalled. Data are not valid, do not use. |
| Measurements: | nsahsrlC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/13/2012 | 0000 | 03/18/2013 | 1730 |
| Subject: | NSA/HSRL/C1 - Degraded operation, laser instability, dirty window |
| DataStreams: | nsahsrlC1.a1 |
| Description: | Following installation instrument was still not operating optimally. Laser instability and reduced sensitivity were impacting measurements. Cleaning of the external window improved signal levels and sensitivity on March 18 17:30. The height of detected clouds and aerosols is quantitative and accurate however the calibrated backscatter quantities are uncertain. Nevertheless, the sensitivity of the HSRL even in this degraded capacity is superior to VCeil and MPL for cloud and aerosol detection. |
| Measurements: | nsahsrlC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/18/2013 | 1730 | 07/19/2013 | 2230 |
| Subject: | NSA/HSRL/C1 - Laser instability |
| DataStreams: | nsahsrlC1.a1 |
| Description: | The HSRL laser still exhibits instability causing calibration uncertainty, especially for the beta_a (extinction profile), beta_a_backscatter (backscatter profile), and depol (depolarization ratio). Cloud and aerosol layer heights are quantitative and accurate however the calibrated quantities above have increased uncertainty. Nevertheless, the sensitivity of the HSRL in this degraded mode is still superior to other lidar on site (MPL and VCeil). The laser failed on 07/19/2013 at 22:30. |
| Measurements: | nsahsrlC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/19/2013 | 2200 | 09/15/2013 | 2200 |
| Subject: | NSA/HSRL/C1 - Instrument problem, Laser failure |
| DataStreams: | nsahsrlC1.a1 |
| Description: | Starting at around 08:00 UTC on July 20, the HSRL laser output stopped. The laser was repaired by UW SSEC staff on July 10 but instrument work continued until Sept 15 22:00 UTC. All lidar profiles in this time period should be deemed "bad" and not used. |
| Measurements: | nsahsrlC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/29/2013 | 0300 | 09/30/2013 | 1425 |
| Subject: | NSA/HSRL/C1 - Filter wheel problem |
| DataStreams: | nsahsrlC1.a1 |
| Description: | An automated filter wheel failed to move properly and/or report position properly. This data is unusable. |
| Measurements: | nsahsrlC1.a1:
|