Data Quality Reports for Session: 182834 User: wuy2 Completed: 01/16/2017


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D081022.13HFE/MET/M1 - Wind speed data contain offset due to induced voltagehfemetM1.b1Suspect
D090216.3HFE/MET/M1 - Intermittent barometer failurehfemetM1.b1Does not affect quality
D090216.4HFE/MET/M1 - Intermittent PWD datahfemetM1.b1Does not affect quality
D090220.2HFE/MET/M1 - ORG measuring ice crystals or foghfemetM1.b1Incorrect
D090220.3HFE/MET/M1 - Induced voltage on wind speed sensor cablehfemetM1.b1Suspect
D140213.5HFE/MET/M1 - Precipitation data biashfemetM1.b1Suspect


DQRID : D081022.13
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/19/2008000012/28/20082159Suspect
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:
  • Wind speed vector mean(wspd_vec_mean)
  • Wind speed, lower, 1-min avg(wspd_arith_mean)


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DQRID : D090216.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/19/2008000012/28/20082159Does not affect quality
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:
  • Atmospheric pressure(atmos_pressure)


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DQRID : D090216.4
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/19/2008000012/28/20082159Does not affect quality
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:
  • pwd_pw_code_15min
  • pwd_cumul_rain
  • PWD 1 minute mean visibility(pwd_mean_vis_1min)
  • PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
  • pwd_err_code
  • PWD 10 minute mean visibility(pwd_mean_vis_10min)
  • pwd_pw_code_inst
  • pwd_pw_code_1hr


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DQRID : D090220.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
11/27/2008161411/27/20082331Incorrect
12/23/2008175412/24/20080006Incorrect
12/14/2008171212/14/20081726Incorrect
12/05/2008094612/06/20080013Incorrect
12/14/2008184812/15/20080052Incorrect
11/09/2008210811/09/20082304Incorrect
12/14/2008150012/14/20081532Incorrect
12/22/2008040812/23/20080043Incorrect
12/04/2008195512/04/20082351Incorrect
11/09/2008192011/09/20081956Incorrect
12/06/2008142412/06/20082322Incorrect
12/21/2008065712/22/20080232Incorrect
Subject:
HFE/MET/M1 - ORG measuring ice crystals or fog
DataStreams:hfemetM1.b1
Description:
The ORG was measuring consistent values for long periods of time.  Typically this is 
indicative of fog, ice crystals in the air or poor performance of the lens heaters.
Measurements:hfemetM1.b1:
  • ORG precipitation rate mean(org_precip_rate_mean)


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DQRID : D090220.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/19/2008000012/28/20082359Suspect
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:
  • Wind speed vector mean(wspd_vec_mean)
  • Wind speed, lower, 1-min avg(wspd_arith_mean)


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DQRID : D140213.5
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/09/2008000012/28/20082359Suspect
Subject:
HFE/MET/M1 - Precipitation data bias
DataStreams:hfemetM1.b1
Description:
Mounting of the optical rain gauge and present weather sensor on cross-arms affixed to the 
meteorological tower introduced a precipitation rate bias. Precipitation data at this 
site should be used with caution.
Measurements:hfemetM1.b1:
  • pwd_cumul_rain
  • ORG precipitation rate mean(org_precip_rate_mean)
  • PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)


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END OF DATA