DQR ID | Subject | Data Streams Affected |
---|---|---|
D081022.13 | HFE/MET/M1 - Wind Speed data contain offset due to induced voltage | hfemetM1.b1 |
D090211.7 | HFE/AOS/M1 - PSAP data missing | hfeaosM1.a1 |
D090213.1 | HFE/SKYRAD/M1 - IRT bias | hfeskyrad60sM1.b1 |
D090213.3 | HFE/MWRHF/M1 - Calibration updates | hfemwrhfM1.b1 |
D090216.3 | HFE/MET/M1 - Intermittent barometer failure | hfemetM1.b1 |
D090216.4 | HFE/MET/M1 - Intermittent PWD data | hfemetM1.b1 |
D090220.3 | HFE/MET/M1 - Induced voltage on wind speed sensor cable | hfemetM1.b1 |
D090310.2 | HFE/MWRHF/M1 - Elevated noise in 150 GHz data | hfemwrhfM1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/19/2008 | 0000 | 12/28/2008 | 2159 |
Subject: | HFE/MET/M1 - Wind Speed data contain offset due to induced voltage |
DataStreams: | hfemetM1.b1 |
Description: | The marine model of the RM Young wind sensor needs twisted pair shielded cable. The manufacturer did not originally supply the pigtail with twisted pair shielded cable. Use of twisted pair shielded cable for the rest of the cable run to the logger was also not specified. This caused an induced voltage in the wind speed line from the wind direction excitation. The induced voltage varied from sensor to sensor and probably changed anytime the cable was replaced or parts of the wind sensor were repaired or replaced. The induced voltage has been seen to vary from 0.15 m/s to as much as 1.08 m/s. |
Measurements: | hfemetM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/23/2008 | 0155 | 12/28/2008 | 2300 |
Subject: | HFE/AOS/M1 - PSAP data missing |
DataStreams: | hfeaosM1.a1 |
Description: | The PSAP was disconnected during this time period. |
Measurements: | hfeaosM1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/16/2008 | 0000 | 12/28/2008 | 2359 |
Subject: | HFE/SKYRAD/M1 - IRT bias |
DataStreams: | hfeskyrad60sM1.b1 |
Description: | The sky temperatures exhibited a positive bias compared to AERI, especially when < 230K. This is indicative of an incorrect emissivity setting (to compensate for the gold mirror) or a poor calibration. A similar problem with the same instrument occurred during the FKB deployment that was attributed to water vapor. |
Measurements: | hfeskyrad60sM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/09/2008 | 0500 | 12/28/2008 | 2359 |
Subject: | HFE/MWRHF/M1 - Calibration updates |
DataStreams: | hfemwrhfM1.b1 |
Description: | The MWRHF calibration algorithm updates the calibration parameters every time a new successful tip curve is acquired. This results in small jumps (1-2 K) in the brightness temperatures each time calibration is updated. During times of frequent calibrations the data appear discontinuous with short data segments interrupted by small jumps. |
Measurements: | hfemwrhfM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/19/2008 | 0000 | 12/28/2008 | 2159 |
Subject: | HFE/MET/M1 - Intermittent barometer failure |
DataStreams: | hfemetM1.b1 |
Description: | Intermittent barometer failure occurred throughout the deployment. We were unable to pinpoint the cause of the failure. Typically one or two minutes of missing data occurred every few days. Since pressure data is typically invariant over 1 minute, linear interpolation should be fine to fill in missing data. |
Measurements: | hfemetM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/19/2008 | 0000 | 12/28/2008 | 2159 |
Subject: | HFE/MET/M1 - Intermittent PWD data |
DataStreams: | hfemetM1.b1 |
Description: | The Present Weather Detector had intermittent missing values throughout this deployment. Missing values occurred almost everyday, usually just one or two minutes per day. |
Measurements: | hfemetM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/19/2008 | 0000 | 12/28/2008 | 2359 |
Subject: | HFE/MET/M1 - Induced voltage on wind speed sensor cable |
DataStreams: | hfemetM1.b1 |
Description: | The cable for the wind monitor is not a twisted pair shielded cable. This caused an induced voltage on the wind sensor wires from the wind direction measurement excitation voltage. A small offset is added into the wind speeds. This value varies. Most frequently the values of 0.49, 0.588 and 0.686 m/s were added into the wind speed. On 11/27/2008 the value jumped to 0.98 m/s for most of the day. |
Measurements: | hfemetM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/02/2008 | 2341 | 12/28/2008 | 2359 |
Subject: | HFE/MWRHF/M1 - Elevated noise in 150 GHz data |
DataStreams: | hfemwrhfM1.b1 |
Description: | The noise level of the 150 GHz channel was about 4 times higher than expected, likely due to failure of the noise diode. Disregard the 150 GHz data. |
Measurements: | hfemwrhfM1.b1:
|