DQRID : D051209.5
Start DateStart TimeEnd DateEnd Time Data Quality Metric
08/30/2005200012/12/20050346Suspect
more
Subject:
TWP/CEIL/C2 - occasional communication fault
DataStreams:twpceilC2.b1
Description:
Beginning August 30, 2005, the Nauru Ceilometer periodically went into a strange 
operational mode where the backscatter data exhibits vertical stripes.  Looking at the backscatter 
data - there are high amplitude oscillations occuring in the backscatter as a function 
of time at a given height.  The phenomenon appears to be more common at night.  Dates 
include: 30 Aug, 31 Aug, 1 Sep, 9 Sep, 15 Sep, 20 Oct, 22 Oct, 8 Dec, and others.

The fiber optic link to the ceilometer was faulty and causing periodic data corruption. 
The problem was corrected when the fiber optic line was replaced with a hard wired RS232 
link.
Suggestions: 
Data should be ignored during obvious periods of data corruption.
Measurements:twpceilC2.b1:
  • range
  • first_cbh
  • laser_temperature
  • background_light
  • second_cbh
  • filename
  • lat
  • status_flag
  • laser_pulse_energy
  • tilt_angle
  • backscatter
  • window_contamination
  • measurement_parameters
  • receiver_sensitivity
  • status_string
  • alt_highest_signal
  • sum_backscatter
  • detection_status
  • lon
  • alt
  • base_time
  • third_cbh
  • vertical_visibility
  • time_offset
more

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