Data Quality Reports for Session: 131215 User: zhangjq200 Completed: 10/29/2010


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D081022.13HFE/MET/M1 - Wind Speed data contain offset due to induced voltagehfemetM1.b1
D090216.3HFE/MET/M1 - Intermittent barometer failurehfemetM1.b1
D090216.4HFE/MET/M1 - Intermittent PWD datahfemetM1.b1
D090220.2HFE/MET/M1 - ORG Measuring Ice Crystals or FoghfemetM1.b1
D090220.3HFE/MET/M1 - Induced voltage on wind speed sensor cablehfemetM1.b1
D100722.4HFE/MET/M1 - Reprocess: ORG Data has very small rainrate valueshfemetM1.b1


DQRID : D081022.13
Start DateStart TimeEnd DateEnd Time
05/19/2008000012/28/20082159
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_spd_arith_max
  • Vector-averaged Wind Speed(wind_spd_vec_avg)
  • wind_spd_arith_min
  • wind_spd_arith_sd
  • Wind speed, lower, 1-min avg(wind_spd_arith_avg)


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DQRID : D090216.3
Start DateStart TimeEnd DateEnd Time
05/19/2008000012/28/20082159
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
05/19/2008000012/28/20082159
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_cumul_snow
  • Average 10 min visibility(pwd_avg_vis_10_min)
  • pwd_pw_code_15_min
  • pwd_id
  • pwd_err_code
  • Average 1 min visibility(pwd_avg_vis_1_min)
  • pwd_pw_code_1_hr
  • pwd_avg_H2O_int_1_min
  • pwd_pw_code_inst
  • pwd_cumul_water


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DQRID : D090220.2
Start DateStart TimeEnd DateEnd Time
11/09/2008192011/09/20081956
11/19/2008210811/09/20082304
11/27/2008161411/27/20082331
12/04/2008195512/04/20082351
12/05/2008094612/06/20080013
12/06/2008142412/06/20082322
12/14/2008150012/14/20081532
12/14/2008171212/14/20081726
12/14/2008184812/15/20080052
12/21/2008065712/22/20080232
12/22/2008040812/23/20080043
12/23/2008175412/24/20080006
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:
  • precip_rate_sd
  • Rain, surface, 1-min avg(precip_rate_mean)
  • precip_rate_max
  • precip_rate_min


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DQRID : D090220.3
Start DateStart TimeEnd DateEnd Time
05/19/2008000012/28/20082359
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_spd_arith_max
  • Vector-averaged Wind Speed(wind_spd_vec_avg)
  • wind_spd_arith_min
  • wind_spd_arith_sd
  • Wind speed, lower, 1-min avg(wind_spd_arith_avg)


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DQRID : D100722.4
Start DateStart TimeEnd DateEnd Time
05/09/2008000012/28/20082359
Subject:
HFE/MET/M1 - Reprocess: ORG Data has very small rainrate values
DataStreams:hfemetM1.b1
Description:
The ORG data is collected via analog signal and not digital.  Therefore, we continuously 
collect data even when no rain is occurring.  We also capture small events such as leaves, 
large bugs, dust, etc blowing through the measurement path.  Because this discrete event 
occurs quickly the value is usually captured for 1 or 2 seconds.  This value is then 
averaged to the minute producing rainrate on the order of .009 mm/hr or less.  

These values are not indicative of rain and should be removed from the record or summing 
over long periods can bias the climate record.  We will reprocess the data to remove these 
small values.
Measurements:hfemetM1.b1:
  • precip_rate_sd
  • Rain, surface, 1-min avg(precip_rate_mean)
  • precip_rate_max
  • precip_rate_min


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END OF DATA