DQR ID | Subject | Data Streams Affected |
---|---|---|
D050624.6 | NSA/VCEIL/C1 - Reprocess: Intermittent data and clock drift | nsavceil25kC1.b1 |
D051219.1 | NSA/VCEIL/C1 - poor sensitivity at low altitude | nsavceil25kC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/16/2005 | 0000 | 06/27/2005 | 2359 |
Subject: | NSA/VCEIL/C1 - Reprocess: Intermittent data and clock drift |
DataStreams: | nsavceil25kC1.b1 |
Description: | The available processed data for the NSA.C1 VCEIL for the time period indicated are incomplete. The raw data is largely complete but pre-processing is required before these data can be reprocessed to produce a complete netcdf data set. While awaiting the reprocessed data set, the intermittent data are available from the ARM Archive. Users should be aware that the data are additionally compromised by a clock drift of at least 10 minutes, though this likely has little affect on cloud detection results. The clock drift will not be addressed by the reprocessing. Note also, that the clock drift was corrected at the end of the DQR period, but it may have existed before the beginning of the DQR period. The data for this period should be used with caution. |
Measurements: | nsavceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/27/2005 | 1930 | 05/02/2006 | 0000 |
Subject: | NSA/VCEIL/C1 - poor sensitivity at low altitude |
DataStreams: | nsavceil25kC1.b1 |
Description: | The ceilometer has an internal amplifier that it sets to low or high depending on prevalant conditions. Normally, the gain is automatically set high during clear skies. It appears that during these times, a slight degradation in either the transmitter or receiver is being amplified and produces a "ripple" at low altitudes in the backscatter plot. Cloud base height detection is not affected. |
Measurements: | nsavceil25kC1.b1:
|