Data Quality Reports for Session: 122128 User: jean1charl Completed: 08/28/2009

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040525.28SGP/MPL/C1 - Metadata errorssgpmplC1.a1, sgpmplnor1campC1.c1
D980331.1Instrument misalignment reportsgpmplnor1campC1.c1
D980402.1Laser Output Energy Monitor at Zerosgpmplnor1campC1.c1
D980402.2Laser Output Energy Monitor at Zerosgpmplnor1campC1.c1


DQRID : D040525.28
Start DateStart TimeEnd DateEnd Time
05/01/1996000001/19/20002359
Subject:
SGP/MPL/C1 - Metadata errors
DataStreams:sgpmplC1.a1, sgpmplnor1campC1.c1
Description:
The latitude, longitude and altitude of the Micropulse Lidar
(MPL) were incorrectly entered into the ARM database.  The 
correct location of the SGP.C1 MPL is:
   Lat: 36.606N
   Lon: 97.485W
   Alt:    316m
Measurements:sgpmplC1.a1:
  • lat(lat)
  • lon(lon)
  • Dummy altitude for Zeb(alt)
sgpmplnor1campC1.c1:
  • lat(lat)
  • Dummy altitude for Zeb(alt)
  • lon(lon)

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DQRID : D980331.1
Start DateStart TimeEnd DateEnd Time
04/15/1997000009/10/19970000
Subject:
Instrument misalignment report
DataStreams:sgpmplnor1campC1.c1
Description:
A low-resolution (300 m) MPL system (unit number 04) was installed at the
SGP site in April '97 upon the laser diode failure of the 02 unit in
March.  Calibration of this instrument in August found that the optics
were misaligned causing a near range focusing error in the data.  
Calibration files produced for this data, while acceptable, do not 
completely correct for the problem.  As a result, aerosol property 
retrievals using this data are not suggested.  Cloud boundary heights, 
though appear satisfactory.  This system was removed from SGP in early 
September
Measurements:sgpmplnor1campC1.c1:
  • Aerosol backscatter coefficient at 355 nm(backscatter)

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DQRID : D980402.1
Start DateStart TimeEnd DateEnd Time
04/25/1997212304/28/19971459
Subject:
Laser Output Energy Monitor at Zero
DataStreams:sgpmplnor1campC1.c1
Description:
Energy monitor reading for laser output is at zero for intermittant
one-minute averaged shots during this flagged data period.  From the
lidar equation progressing to normalized relative backscatter the
laser energy is required and is a denominator.  Therefore a value of
zero will render the product as infinite.  Shots where this has taken
place are left as zeros.  It is suggested that the time period
19970425 2123 - 19970428 1459
be avoided for any quantitative analysis.
Measurements:sgpmplnor1campC1.c1:
  • Aerosol backscatter coefficient at 355 nm(backscatter)

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DQRID : D980402.2
Start DateStart TimeEnd DateEnd Time
09/02/1997221109/03/19971359
09/07/1997144509/08/19971544
09/10/1997214209/10/19972355
Subject:
Laser Output Energy Monitor at Zero
DataStreams:sgpmplnor1campC1.c1
Description:
Energy monitor reading for laser output is at zero for intermittant
one-minute averaged shots during this flagged data period.  From the
lidar equation progressing to normalized relative backscatter the
laser energy is required and is a denominator.  Therefore a value of
zero will render the product as infinite.  Shots where this has taken
place are left as zeros.  It is suggested that the time periods 
19970902 2211 - 19970903 1359,
19970907 1445 - 19970908 1544,
and
19970910 2142 - 19970910 2355
be avoided for any quantitative analysis.
Measurements:sgpmplnor1campC1.c1:
  • Aerosol backscatter coefficient at 355 nm(backscatter)

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