DQR ID | Subject | Data Streams Affected |
---|---|---|
D020329.1 | SGP/RL/C1 - Ground bin channel variability introduced height offsets | sgprlC1.a0 |
D040525.17 | SGP/RL/C1 - Metadata errors | sgprlC1.a0 |
D041109.1 | SGP/RL/C1 - Decreased sensitivity | sgp10rlprofasr1ferrC1.c1, sgp10rlprofbe1turnC1.c0, sgp10rlprofbe1turnC1.c1, sgp10rlprofdep1turnC1.c1, sgp10rlprofext1ferrC1.c1, sgp10rlprofmr1turnC1.c1, sgprlC1.00, sgprlC1.a0 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/04/1996 | 0000 | 07/27/1998 | 2359 |
01/15/1999 | 0000 | 03/01/1999 | 2359 |
Subject: | SGP/RL/C1 - Ground bin channel variability introduced height offsets |
DataStreams: | sgprlC1.a0 |
Description: | A maintenence visit in January 1999 to work on the Raman lidar laser resulted in a height offset being introduced into the raw data. This offset was found and corrected, but approximately six weeks of data (of which the lidar was only operational for about 14 days) have the ground bin at #69 versus #65 (a 156 m offset). A second, related but more serious, problem that resulted in height offsets was due to different styles of multi-channel scalar (MCS) cards in the system. The first (original) style was used in the system had the ground at bin #66. However, these cards occasionally faulted and 5 of them were replaced simultaneously at the end of the 1997 Water Vapor IOP. The new style of cards have slightly different electronics, which resulted in the ground bin being at bin #65 rather than #66. Since there were still 2 of the old style cards in the system when it was restarted (they had not yet faulted), the result is that there are channel dependent height offsets for a period of time, until finally new style MCS cards were put in all channels. Since most of the derived products from the Raman lidar are ratios of two channels, this difference in the ground bin has a undesired and somewhat disguised effect on the data. The mentor has decreed that ground bin #65 shall be the standard for all raman lidar data. The data affected by the ground bin variability are in the queue for reprocessing to remove the offset. In the interim, these data should be used with caution. Ground bin number history: ========================== prior to and up to 10/6/97 all channels bin #66 10/7/97 to 6/9/98 high & low water vapor channels bin #66 all other channels bin #65 6/10/98 to 7/27/98 low water vapor channel bin #66 all other channels bin #65 7/28/98 to 1/14/99 all channels bin #65 1/15/99 to 3/1/99 all channels bin #69 3/2/99 to current all channels bin #65 |
Measurements: | sgprlC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/03/1996 | 1503 | 03/17/2003 | 2359 |
Subject: | SGP/RL/C1 - Metadata errors |
DataStreams: | sgprlC1.a0 |
Description: | The latitude, longitude and altitude of the Raman Lidar were incorrectly entered into the ARM database. The correct location of the SGP.C1 Raman Lidar is: Lat: 36.609N Lon: 97.487W Alt: 311m |
Measurements: | sgprlC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/2002 | 0000 | 09/17/2004 | 1745 |
Subject: | SGP/RL/C1 - Decreased sensitivity |
DataStreams: | sgp10rlprofasr1ferrC1.c1, sgp10rlprofbe1turnC1.c0, sgp10rlprofbe1turnC1.c1, sgp10rlprofdep1turnC1.c1, sgp10rlprofext1ferrC1.c1, sgp10rlprofmr1turnC1.c1, sgprlC1.00, sgprlC1.a0 |
Description: | The sensitivity of the Raman Lidar degraded significantly beginning in late 2001. Between May and September 2004, the electronics were upgraded and the telescope was refurbished resulting in sensitivity better than when the instrument system was first installed. A detailed technical report describing the effects of the signal degradation and the steps taken to correct the problem is being written. In the interim, contact Dave Turner (dave.turner@pnl.gov) for more information. |
Measurements: | sgp10rlprofdep1turnC1.c1:
sgp10rlprofmr1turnC1.c1:
sgp10rlprofext1ferrC1.c1:
sgprlC1.00:
sgp10rlprofasr1ferrC1.c1:
sgp10rlprofbe1turnC1.c1:
sgprlC1.a0:
sgp10rlprofbe1turnC1.c0:
|