Data Quality Reports for Session: 152972 User: yeonii1v Completed: 09/11/2013


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D080225.1TWP/SMET/C3 - Upper Wind Sensor Data Questionabletwpsmet60sC3.b1
D080428.2TWP/SMET/C1 - Reprocess: ORG Data has very small rainrate valuestwpsmet60sC1.b1
D080428.3TWP/SMET/C3 - Reprocess: ORG Data has very small rainrate valuestwpsmet60sC3.b1
D080428.4TWP/SMET/C2 - Reprocess: ORG Data has very small rainrate valuestwpsmet60sC2.b1
D080611.2TWP/SMET/C3 - Lower Wind Direction Intermittently Wrongtwpsmet60sC3.b1
D080617.1TWP/SMET/C2 - ORG rainfall measurements too largetwpsmet60sC2.b1
D080707.2TWP/SMET/C1 - ORG Precip Data Incorrecttwpsmet60sC1.b1
D080715.1TWP/SMET/C3 - Upper wind speed data incorrecttwpsmet60sC3.b1
D081022.3TWP/SMET/C1 - Wind Speed data contain offset due to induced voltagetwpsmet60sC1.b1
D081022.5TWP/SMET/C2 - Wind Speed data contain offset due to induced voltagetwpsmet60sC2.b1
D081022.8TWP/SMET/C3 - Wind Speed data contain offset due to induced voltagetwpsmet60sC3.b1
D081027.2TWP/SMET/C2 - ORG rainrate high due to calibration.twpsmet60sC2.b1
D090129.4TWP/SMET/C3 - Reprocess: Station Pressure values reported in hPa instead of kPa.twpsmet60sC3.b1
D090304.1TWP/SMET/C1 - Optical Rain Gage Inoperativetwpsmet60sC1.b1
D090515.1TWP/SMET/C3 - Reprocess: Temperature Biased low by 1.06 Degreestwpsmet60sC3.b1
D090604.2TWP/SMET/C2 - Barometer data incorrecttwpsmet60sC2.b1
D090708.1TWP/SMET/C1 - Reprocess: Barometric pressure data scaled incorrectlytwpsmet60sC1.b1
D090918.1TWP/SMET/C2 - Induced wind speed when calmtwpsmet60sC2.b1
D091023.1TWP/SMET/C3 - Tower Lowered for Maintenancetwpsmet60sC3.b1
D091030.2TWP/SMET/C2 - Tower Lowered for Maintenancetwpsmet60sC2.b1
D100303.3TWP/SMET/C2 - Barometer failuretwpsmet60sC2.b1
D100603.1TWP/SMET/C1 - Missing RH, Barometer, and ORG datatwpsmet60sC1.b1
D110105.1TWP/SMET/C1 - Aux (lower) wind sensor failedtwpsmet60sC1.b1


DQRID : D080225.1
Start DateStart TimeEnd DateEnd Time
01/05/2008000002/27/20080315
Subject:
TWP/SMET/C3 - Upper Wind Sensor Data Questionable
DataStreams:twpsmet60sC3.b1
Description:
The wind_up vs. wind_low wind directions diverged, with the differences between the two 
eventually reached 45 degrees. The Upper sensor was found to be mis-aligned and loose.
Measurements:twpsmet60sC3.b1:
  • up_spd_vec_avg
  • up_spd_max
  • up_spd_sd
  • up_spd_min
  • up_spd_arith_avg


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DQRID : D080428.2
Start DateStart TimeEnd DateEnd Time
08/01/2004000006/30/20102359
Subject:
TWP/SMET/C1 - Reprocess: ORG Data has very small rainrate values
DataStreams:twpsmet60sC1.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 are reprocessing the data to remove these small 
values and are adjusting the collection program to remove them before ingest.
Measurements:twpsmet60sC1.b1:
  • Precipitation minimum(precip_min)
  • Precipitation maximum(precip_max)
  • precip_sd
  • Precipitation mean(precip_mean)


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DQRID : D080428.3
Start DateStart TimeEnd DateEnd Time
05/01/2004000006/30/20102359
Subject:
TWP/SMET/C3 - Reprocess: ORG Data has very small rainrate values
DataStreams:twpsmet60sC3.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:twpsmet60sC3.b1:
  • precip_sd
  • Precipitation maximum(precip_max)
  • Precipitation minimum(precip_min)
  • Precipitation mean(precip_mean)


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DQRID : D080428.4
Start DateStart TimeEnd DateEnd Time
07/01/2004000006/30/20102359
Subject:
TWP/SMET/C2 - Reprocess: ORG Data has very small rainrate values
DataStreams:twpsmet60sC2.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:twpsmet60sC2.b1:
  • Precipitation minimum(precip_min)
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • precip_sd


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DQRID : D080611.2
Start DateStart TimeEnd DateEnd Time
05/27/2008194506/24/20080113
Subject:
TWP/SMET/C3 - Lower Wind Direction Intermittently Wrong
DataStreams:twpsmet60sC3.b1
Description:
The lower wind sensor cabling had a problem causing an intermittent connection for the 
wind direction data.
Measurements:twpsmet60sC3.b1:
  • lo_dir_sd
  • lo_dir_vec_avg


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DQRID : D080617.1
Start DateStart TimeEnd DateEnd Time
05/08/2008000008/07/20082300
Subject:
TWP/SMET/C2 - ORG rainfall measurements too large
DataStreams:twpsmet60sC2.b1
Description:
The ORG was collecting large amounts of rainfall compared to the co-located tipping bucket 
raingauge.  The cable was chewed by mice causing the wires to make contact 
intermittently mimicking rainfall.
Measurements:twpsmet60sC2.b1:
  • Precipitation minimum(precip_min)
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • precip_sd


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DQRID : D080707.2
Start DateStart TimeEnd DateEnd Time
02/07/2008130002/09/20080600
Subject:
TWP/SMET/C1 - ORG Precip Data Incorrect
DataStreams:twpsmet60sC1.b1
Description:
Moisture intrusion into the sensor body allowed condensation on the lens of the ORG.  
Continual and long-term precipitation was reported during this time.
Measurements:twpsmet60sC1.b1:
  • Precipitation minimum(precip_min)
  • Precipitation maximum(precip_max)
  • precip_sd
  • Precipitation mean(precip_mean)


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DQRID : D080715.1
Start DateStart TimeEnd DateEnd Time
07/08/2008204507/17/20080144
Subject:
TWP/SMET/C3 - Upper wind speed data incorrect
DataStreams:twpsmet60sC3.b1
Description:
Beginning on 07/08, the upper wind sensor started reporting significantly lower wind 
speeds than the lower wind sensor.  The cable connections weather proofing failed allowing 
corrosion to occur and increasing he resistance of the cables.  This in turn lowered the 
wind speeds artificially.
Measurements:twpsmet60sC3.b1:
  • up_spd_vec_avg
  • up_spd_max
  • up_spd_sd
  • up_spd_min
  • up_spd_arith_avg


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DQRID : D081022.3
Start DateStart TimeEnd DateEnd Time
10/09/1996000011/03/20080730
Subject:
TWP/SMET/C1 - Wind Speed data contain offset due to induced voltage
DataStreams:twpsmet60sC1.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:twpsmet60sC1.b1:
  • lo_spd_max
  • up_spd_max
  • lo_spd_vec_avg
  • lo_spd_min
  • lo_spd_arith_avg
  • up_spd_sd
  • up_spd_vec_avg
  • up_spd_arith_avg
  • up_spd_min
  • lo_spd_sd


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DQRID : D081022.5
Start DateStart TimeEnd DateEnd Time
11/01/1998000002/23/20090410
Subject:
TWP/SMET/C2 - Wind Speed data contain offset due to induced voltage
DataStreams:twpsmet60sC2.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:twpsmet60sC2.b1:
  • lo_spd_arith_avg
  • lo_spd_min
  • lo_spd_vec_avg
  • up_spd_min
  • up_spd_arith_avg
  • lo_spd_max
  • up_spd_sd
  • up_spd_max
  • lo_spd_sd
  • up_spd_vec_avg


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DQRID : D081022.8
Start DateStart TimeEnd DateEnd Time
03/12/2002000010/17/20080627
Subject:
TWP/SMET/C3 - Wind Speed data contain offset due to induced voltage
DataStreams:twpsmet60sC3.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:twpsmet60sC3.b1:
  • up_spd_vec_avg
  • lo_spd_vec_avg
  • lo_spd_sd
  • lo_spd_min
  • up_spd_max
  • up_spd_sd
  • up_spd_min
  • lo_spd_arith_avg
  • up_spd_arith_avg
  • lo_spd_max


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DQRID : D081027.2
Start DateStart TimeEnd DateEnd Time
10/05/2008231110/05/20082344
Subject:
TWP/SMET/C2 - ORG rainrate high due to calibration.
DataStreams:twpsmet60sC2.b1
Description:
The rainrate from the ORG was high due to calibration.  This data is not real.
Measurements:twpsmet60sC2.b1:
  • Precipitation minimum(precip_min)
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • precip_sd


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DQRID : D090129.4
Start DateStart TimeEnd DateEnd Time
01/27/2009185001/30/20091535
Subject:
TWP/SMET/C3 - Reprocess: Station Pressure values reported in hPa instead of kPa.
DataStreams:twpsmet60sC3.b1
Description:
An incorrect program was entered into the datalogger.  This program did not convert the 
station pressure from hPa to kPa.  This made the values larger by a factor of 10 and caused 
the QC bit to be tripped.
Measurements:twpsmet60sC3.b1:
  • Barometric Pressure(atmos_pressure)


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DQRID : D090304.1
Start DateStart TimeEnd DateEnd Time
02/07/2009010004/03/20090225
Subject:
TWP/SMET/C1 - Optical Rain Gage Inoperative
DataStreams:twpsmet60sC1.b1
Description:
Beginning on 02/07/2009, the trending between the TBRG and ORG began to look poor, one 
recording precip when the other was not and vice versa.  After a while the ORG quit 
registering any precip at all.  ORG was replaced.
Measurements:twpsmet60sC1.b1:
  • Precipitation minimum(precip_min)
  • Precipitation maximum(precip_max)
  • precip_sd
  • Precipitation mean(precip_mean)


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DQRID : D090515.1
Start DateStart TimeEnd DateEnd Time
04/19/2005042004/04/20090115
Subject:
TWP/SMET/C3 - Reprocess: Temperature Biased low by 1.06 Degrees
DataStreams:twpsmet60sC3.b1
Description:
The temperature of the SMET system was biased low by 1.06 Deg C due to a non-precision 
resistor being used int he measurement circuit.  The data will be reprocessed.  Saturation 
Vapor pressure and Vapor pressure will have to be reprocessed also.

Add 1.06 degrees to the temperature data.  

Correct Sat Vap Press using the Buck approximation:
   Es = 6.1121exp((17.502*T)/(240.97 + T) 
where T is the temperature in C.  

Correct Vapor pressure using: E = (RH*Es)/100
Measurements:twpsmet60sC3.b1:
  • temp_sd
  • Mean Air Temperature or Hardware Error(temp_mean)
  • Vapor pressure mean(vappress_mean)
  • vappress_sd


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DQRID : D090604.2
Start DateStart TimeEnd DateEnd Time
05/20/2009000406/05/20092359
Subject:
TWP/SMET/C2 - Barometer data incorrect
DataStreams:twpsmet60sC2.b1
Description:
Beginning 05/20, atmos_pressure exceeded MAX between ~21:00 and 01:00 UTC on most days.  
The inlet tube was accidentally pinched in the door of the logger enclosure artificially 
increasing the atmospheric pressure during the listed times.  Only a few hours exceeded 
max limits.
Measurements:twpsmet60sC2.b1:
  • Barometric Pressure(atmos_pressure)


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DQRID : D090708.1
Start DateStart TimeEnd DateEnd Time
07/06/2009231907/07/20091348
Subject:
TWP/SMET/C1 - Reprocess: Barometric pressure data scaled incorrectly
DataStreams:twpsmet60sC1.b1
Description:
The barometer data was scaled incorrectly when a new program was loaded into the 
datalogger.  The pressure data was reported as mb (hPa) instead of the standard kPa.  So, in 
essence the value was a factor of ten to large.
Measurements:twpsmet60sC1.b1:
  • Barometric Pressure(atmos_pressure)


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DQRID : D090918.1
Start DateStart TimeEnd DateEnd Time
07/01/2009010010/15/20090300
Subject:
TWP/SMET/C2 - Induced wind speed when calm
DataStreams:twpsmet60sC2.b1
Description:
The upper and lower wind sensors were not trending well at wind speed below 1 m/s.  Both 
sensors were showing values above 0m/s when calm.  The lightning protector was at fault 
resulting in an induced wind voltage during calm conditions.

Users should subtract any offset found (for example 0.19 m/s for upper wind speed) when 
the wind speeds are flat-lined.  The offset value was not consistent.
Measurements:twpsmet60sC2.b1:
  • lo_spd_arith_avg
  • lo_spd_min
  • lo_spd_vec_avg
  • up_spd_min
  • up_spd_arith_avg
  • lo_spd_max
  • up_spd_max
  • up_spd_vec_avg


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DQRID : D091023.1
Start DateStart TimeEnd DateEnd Time
09/30/2009004509/30/20090500
Subject:
TWP/SMET/C3 - Tower Lowered for Maintenance
DataStreams:twpsmet60sC3.b1
Description:
The tower was lowered for annual anemometer changes.  The wind data is suspect.
Measurements:twpsmet60sC3.b1:
  • lo_spd_sd
  • lo_spd_vec_avg
  • lo_spd_min
  • lo_dir_sd
  • up_spd_arith_avg
  • lo_spd_max
  • up_spd_vec_avg
  • up_dir_sd
  • up_spd_max
  • lo_dir_vec_avg
  • up_spd_min
  • up_spd_sd
  • lo_spd_arith_avg
  • up_dir_vec_avg


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DQRID : D091030.2
Start DateStart TimeEnd DateEnd Time
10/14/2009215010/15/20090315
Subject:
TWP/SMET/C2 - Tower Lowered for Maintenance
DataStreams:twpsmet60sC2.b1
Description:
Data is suspect due to the tower being lowered.
Measurements:twpsmet60sC2.b1:
  • vappress_sd
  • lo_spd_arith_avg
  • relh_sd
  • lo_spd_min
  • lo_dir_vec_avg
  • temp_sd
  • up_dir_vec_avg
  • lo_spd_vec_avg
  • Vapor pressure mean(vappress_mean)
  • up_spd_min
  • up_dir_sd
  • up_spd_max
  • Mean Air Temperature or Hardware Error(temp_mean)
  • up_spd_vec_avg
  • lo_dir_sd
  • Relative humidity mean(relh_mean)
  • up_spd_arith_avg
  • lo_spd_max
  • up_spd_sd
  • lo_spd_sd


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DQRID : D100303.3
Start DateStart TimeEnd DateEnd Time
02/04/2010060002/23/20102315
Subject:
TWP/SMET/C2 - Barometer failure
DataStreams:twpsmet60sC2.b1
Description:
The atmos_pressure values were spiking high (up to 110 kPa) from 06:00 UTC on 02/04 until 
the data went missing at 10:44 UTC on 02/06 when the barometer failed completely.

Barometer replaced 2/23.
Measurements:twpsmet60sC2.b1:
  • Barometric Pressure(atmos_pressure)


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DQRID : D100603.1
Start DateStart TimeEnd DateEnd Time
03/02/2010000005/11/20100330
Subject:
TWP/SMET/C1 - Missing RH, Barometer, and ORG data
DataStreams:twpsmet60sC1.b1
Description:
Atmos_pressure data suddenly went missing on 03/02 at 07:34 UTC and consequently, the 
relative humidity data flatlined. 

Furthermore, after a sudden precipitation event when the max precip rate flag was tripped 
the TBRG total has not agreed with the comparison ORG or the precip rate plot. 

A loose wire connection was fixed 3/22 restoring RH and barometer data.  A damaged cable 
was repaired 5/11 restoring ORG data.
Measurements:twpsmet60sC1.b1:
  • Relative humidity mean(relh_mean)
  • Precipitation minimum(precip_min)
  • relh_sd
  • Barometric Pressure(atmos_pressure)
  • Precipitation maximum(precip_max)
  • precip_sd
  • Precipitation mean(precip_mean)


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DQRID : D110105.1
Start DateStart TimeEnd DateEnd Time
07/05/2010000008/29/20100154
Subject:
TWP/SMET/C1 - Aux (lower) wind sensor failed
DataStreams:twpsmet60sC1.b1
Description:
The lower wind direction sensor on the C1 site was flatlining at 270 degrees throughout 
most of the daylight hours of the day. During the night the sensor appeared to be working 
fine.
Measurements:twpsmet60sC1.b1:
  • lo_spd_max
  • lo_spd_vec_avg
  • lo_spd_min
  • lo_spd_arith_avg
  • lo_dir_vec_avg
  • lo_dir_sd
  • lo_spd_sd


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