DQRID : D970623.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
06/16/1997173006/16/19971730Suspect
more
Subject:
Jump in pressure value B4 sounding
DataStreams:sgpsondewrpnB4.a1
Description:
DQR No:                               Platform:  sgpsondeB4

Subject:        Jump in pressure value B4 sounding 970616:1730

Date Submitted: 6/22/97
Submitted By:   Barry Lesht           _X_  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      ___  Other _____________________________
 
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.

Platform/Measurement: sgpsondewrpnb4/ (alt, asc, press)
    What level data: (raw,a0,a1,b1,c1 etc): all

    What location was the data collected at: SGP/BF4
 
    Period of time in question
        Begin Date  6/16/97    Time   17:30    (GMT)
        End Date               Time            (GMT)

 Data should be labeled:
 _X_  questionable                      _X_  All data fields affected
 ___  incorrect                         ___  Only some data fields affected
 ___  wrong calibration
 ___  others 
 
 Discussion of Problem:

The first pressure value reported by the radiosonde (t = 2 sec) is
931.4.  The surface pressure value was 936.9 hPa.  This difference
is slightly greater than the expected (normal) change and may mean that
either the pressure sensor was jarred during launch or the system 
mis-identified the actual launch start time.  Further clarification requires 
analysis of the raw data which will take some time.  The altitude values 
for this sounding may be incorrect.  The ascent rate values during the 
first 30 seconds also will be wrong.  Because the system will reject 
samples with out of bound ascent rates (i.e., during the first 30 seconds), 
the temperature and rh values also will be incorrect (result of 
interpolation).  Relative height values after 30 seconds should be okay.

 
Other observations/measurements impacted by this problem:


Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)

Flag data.
Suggestions: 
flag data.
Measurements:sgpsondewrpnB4.a1:
  • deg
  • u_wind
  • rh
  • wstat
  • tdry
  • pres
  • base_time
  • alt
  • wspd
  • lon
  • asc
  • v_wind
  • time_offset
  • lat
  • dp
more

Close this window