Data Quality Reports for Session: 137898 User: dmfoper Completed: 10/08/2011


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060407.1NIM/MET/M1 - Software problemnimmetM1.b1
D060524.2NIM/MET/M1 - Optical Rain Gauge FailurenimmetM1.b1
D080304.3NIM/MET/M1 - ORG Data Underestimated PrecipitationnimmetM1.b1
D081022.11NIM/MET/M1 - Wind Speed data contain offset due to induced voltagenimmetM1.b1
D091217.1NIM/MET/M1 - Present Weather Detector Cumulative Precipitation in ErrornimmetM1.b1
D091217.2NIM/MET/M1 - Present Weather Detector 1 Minute Rainfall Data SuspectnimmetM1.b1
D111006.8NIM/MET/M1 - Met data questionablenimmetM1.b1


DQRID : D060407.1
Start DateStart TimeEnd DateEnd Time
01/10/2006160003/01/20060803
Subject:
NIM/MET/M1 - Software problem
DataStreams:nimmetM1.b1
Description:
Intermittent Failure of Logger to read data from the Barometer.
Measurements:nimmetM1.b1:
  • Atmospheric pressure(atmos_pressure)


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DQRID : D060524.2
Start DateStart TimeEnd DateEnd Time
05/13/2006000005/26/20061015
Subject:
NIM/MET/M1  - Optical Rain Gauge Failure
DataStreams:nimmetM1.b1
Description:
The optical rain gauge on the met system did not record precipitation during this time 
period.
Measurements:nimmetM1.b1:
  • precip_rate_min
  • Rain, surface, 1-min avg(precip_rate_mean)
  • precip_rate_max
  • precip_rate_sd


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DQRID : D080304.3
Start DateStart TimeEnd DateEnd Time
01/06/2006000001/06/20072359
Subject:
NIM/MET/M1 - ORG Data Underestimated Precipitation
DataStreams:nimmetM1.b1
Description:
The ORG underestimated precipitation by about 38% during the entire NIM deployment.  No 
troubleshooting technique or replacement of gage was successful in correcting the problem.
Measurements:nimmetM1.b1:
  • precip_rate_min
  • org_carrier_mean
  • Rain, surface, 1-min avg(precip_rate_mean)
  • precip_rate_max
  • precip_rate_sd


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DQRID : D081022.11
Start DateStart TimeEnd DateEnd Time
01/06/2006000001/07/20072359
Subject:
NIM/MET/M1 - Wind Speed data contain offset due to induced voltage
DataStreams:nimmetM1.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:nimmetM1.b1:
  • Wind speed, lower, 1-min avg(wind_spd_arith_avg)
  • Vector-averaged Wind Speed(wind_spd_vec_avg)
  • wind_spd_arith_min
  • wind_spd_arith_max
  • wind_spd_arith_sd


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DQRID : D091217.1
Start DateStart TimeEnd DateEnd Time
05/31/2006000007/31/20062359
Subject:
NIM/MET/M1 - Present Weather Detector Cumulative Precipitation in Error
DataStreams:nimmetM1.b1
Description:
The Present weather detector is a serial sensor.  The MET system datalogger reads in the 
data from this sensor.  During the time in question serial comms problems were causing the 
data from the sensor to be read incorrectly.  The data for one variable showed up in 
data for another variable or not at all.  We reprocessed the data to correct as much of this 
error as we could.  The cumulative rainfall variable was calculated from the 
instantaneous rainfall variable during reprocessing.  Since we cannot be entirely sure all 
cumulative rainfall values are correct or were completely captured the cumulative rainfall data is 
considered to be unreliable.  This issue shows up when comparing the cumulative rainfall 
data at the end of the day 07/31/2006 (79.08) and the beginning of the next day 
08/01/2006 (3.17).  Clearly we were either under or over-estimating the cumulative rainfall.
Measurements:nimmetM1.b1:
  • pwd_cumul_water


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DQRID : D091217.2
Start DateStart TimeEnd DateEnd Time
05/31/2006000007/31/20062359
Subject:
NIM/MET/M1 - Present Weather Detector 1 Minute Rainfall Data Suspect
DataStreams:nimmetM1.b1
Description:
The Present weather detector is a serial sensor.  The MET system datalogger reads in the 
data from this sensor.  During the time in question serial comms problems were causing 
the data from the sensor to be read incorrectly.  The data for one variable showed up in 
data for another variable or not at all.  We reprocessed the data to correct as much of 
this error as we could. We cannot be entirely certain that all rainfall values are correct 
or were captured properly.  It is possible that some values were missed completely.
Measurements:nimmetM1.b1:
  • pwd_avg_H2O_int_1_min


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DQRID : D111006.8
Start DateStart TimeEnd DateEnd Time
12/20/2005000001/05/20062359
Subject:
NIM/MET/M1 - Met data questionable
DataStreams:nimmetM1.b1
Description:
All data from the met tower are suspect during this time period as the systems were being 
deployed and in various states of operation.
Measurements:nimmetM1.b1:
  • temp_sd
  • time
  • Average 10 min visibility(pwd_avg_vis_10_min)
  • logger_temp
  • wind_spd_arith_sd
  • Wind speed, lower, 1-min avg(wind_spd_arith_avg)
  • Temperature mean(temp_mean)
  • org_carrier_mean
  • pwd_err_code
  • Relative humidity mean(relh_mean)
  • Atmospheric pressure(atmos_pressure)
  • pwd_pw_code_1_hr
  • pwd_avg_H2O_int_1_min
  • Vapor pressure mean(vappress_mean)
  • alt
  • time_offset
  • precip_rate_max
  • pwd_pw_code_inst
  • precip_rate_sd
  • pwd_pw_code_15_min
  • pwd_cumul_snow
  • lat
  • precip_rate_min
  • lon
  • wind_dir_sd
  • Vector-averaged Wind Speed(wind_spd_vec_avg)
  • base_time
  • wind_spd_arith_min
  • Average 1 min visibility(pwd_avg_vis_1_min)
  • relh_sd
  • pwd_id
  • Rain, surface, 1-min avg(precip_rate_mean)
  • logger_voltage
  • Vector-averaged Wind Direction(wind_dir_vec_avg)
  • vappress_sd
  • pwd_cumul_water
  • wind_spd_arith_max


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