Data Quality Reports for Session: 184350 User: solfm1 Completed: 03/18/2017


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D141216.1MAG/UHSAS/M1 - Problem with time fieldsmagaosuhsasM1.a1Suspect
D150211.2MAG/AOS/ALL/M1/S1/S2 - Ship in portmagaosuhsasM1.a1Suspect


DQRID : D141216.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
10/02/2012160009/26/20131259Suspect
Subject:
MAG/UHSAS/M1 - Problem with time fields
DataStreams:magaosuhsasM1.a1
Description:
During the deployment the instrument time for the UHSAS was not automatically synched and 
tended to drift fast relative to the time corrected by a time server.  The time of the 
data in the files is about 20 to 360 seconds fast.  This has been determined by comparing 
the time of spikes in UHSAS CPC data.  

Aside from jumps in the time the UHSAS seems to always be drifting faster compared to the 
CPC.  

For the period from 10/18/2012 9:41:45.70 until 10/27/2012 21:06:41.90 the UHSAS is fast 
approximately 30sec.

For the period from 11/06/2012 3:38:42.00 until 12/13/2012 9:35:36.30 the UHSAS is fast 
approximately 60 to 90 sec.

For the period from 05/11/2013 22:37:37.90 until 07/03/2013 8:50:02.80 the UHSAS is fast 
approximately 210 to 360 sec.

For the period from 07/07/2013 23:14:40.00 until 09/25/2013 20:42:48.70 the UHSAS is fast 
approximately 30 to 240 sec.

Documents attached to DQPR 4363 show the time of the peaks used to approximate the error 
in the time.
Measurements:magaosuhsasM1.a1:
  • upper_size_limit
  • purge_flow
  • unit_temperature
  • sheath_flow
  • flow
  • current
  • reference
  • differential_voltage
  • sampling_volume
  • bin_num
  • scattering_voltage
  • lower_size_limit
  • Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)
  • auxiliary
  • sample_pressure
  • MET air temperature(temperature)


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DQRID : D150211.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
08/29/2013124808/31/20131220Suspect
08/01/2013124708/03/20131410Suspect
11/01/2012131411/03/20121757Suspect
07/12/2013060107/13/20131218Suspect
06/06/2013124006/08/20131125Suspect
09/20/2012132709/22/20121223Suspect
11/08/2012133011/09/20121732Suspect
01/03/2013063501/05/20130523Suspect
10/25/2012061210/26/20120650Suspect
11/30/2012013012/01/20121332Suspect
08/15/2013131208/17/20131902Suspect
05/30/2013053805/31/20131148Suspect
11/22/2012061511/24/20121105Suspect
10/04/2012135910/06/20121132Suspect
09/26/2013131909/28/20131135Suspect
08/22/2013090708/23/20131747Suspect
06/13/2013054506/14/20131705Suspect
09/12/2013134009/14/20131305Suspect
07/18/2013223207/20/20131252Suspect
05/16/2013053505/17/20131704Suspect
09/12/2012125509/14/20122326Suspect
06/27/2013065006/28/20131759Suspect
12/20/2012073812/22/20120847Suspect
12/06/2012084212/07/20120820Suspect
07/25/2013050707/26/20131342Suspect
09/27/2012053309/28/20120952Suspect
06/20/2013130306/22/20131205Suspect
05/23/2013132305/25/20131204Suspect
07/03/2013223207/07/20131800Suspect
08/08/2013045908/09/20131040Suspect
09/05/2013054809/06/20131248Suspect
10/03/2013054510/04/20131038Suspect
12/13/2012144012/15/20121351Suspect
10/11/2012060010/12/20120850Suspect
12/27/2012233412/29/20121306Suspect
11/15/2012143011/17/20121315Suspect
10/18/2012131810/20/20121128Suspect
09/19/2013053609/20/20131150Suspect
Subject:
MAG/AOS/ALL/M1/S1/S2 - Ship in port
DataStreams:magaosuhsasM1.a1
Description:
The ship was in port during these periods and the measurements may be affected by various 
sources (overhead cranes, anthropogenic sources, etc).

Note: Dates and times were found by looking at the NAV datastream.  The standard deviation 
of pitch, roll, and surge velocity were used to determine when the ship was slowing down 
to enter port or speeding up to leave port.  Thresholds used; pitch (0.01), roll (0.01), 
surge velocity (3.0)
Measurements:magaosuhsasM1.a1:
  • upper_size_limit
  • purge_flow
  • unit_temperature
  • base_time
  • sheath_flow
  • time
  • North latitude(lat)
  • flow
  • current
  • reference
  • Altitude above mean sea level(alt)
  • differential_voltage
  • sampling_volume
  • bin_num
  • scattering_voltage
  • lower_size_limit
  • Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)
  • time_offset
  • East longitude(lon)
  • sample_pressure
  • MET air temperature(temperature)
  • auxiliary


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