Data Quality Reports for Session: 112863 User: julia1flah Completed: 07/02/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D000504.4TWP/VCEIL/C1 - Ceilometer offsettwpvceil25kC1.b1
D000602.2TWP/VCEIL/C1 - Ceilometer clock drifttwpvceil25kC1.00, twpvceil25kC1.a1, twpvceil25kC1.b1
D000718.7TWP/VCEIL/C1 - Extended data gaptwpvceil25kC1.a1, twpvceil25kC1.b1
D000718.8TWP/VCEIL/C1 - Extended data gaptwpvceil25kC1.a1, twpvceil25kC1.b1
D000718.9TWP/VCEIL/C1 - Extended data gaptwpvceil25kC1.a1, twpvceil25kC1.b1
D000927.2TWP/VCEIL/C1 - Degraded Ceilometer Windowtwpvceil25kC1.a1, twpvceil25kC1.b1
D010222.1TWP/VCEIL/C1 - Receiver Problemtwpvceil25kC1.a1, twpvceil25kC1.b1
D020207.1TWP/VCEIL/C1 - Manus Ceilometer Laser Power Intermittenttwpvceil25kC1.a1, twpvceil25kC1.b1
D020207.2TWP/VCEIL/C1 - Reprocess: Incorrect units on installed ceilometertwpvceil25kC1.a1, twpvceil25kC1.b1
D020620.64TWP/C1 - Incorrect elevation reported in Manus DatatwpmplC1.a1, twpvceil25kC1.a1, twpvceil25kC1.b1
D041013.2TWP/VCEIL/C1 - Data dropoutstwpvceil25kC1.00, twpvceil25kC1.b1


DQRID : D000504.4
Start DateStart TimeEnd DateEnd Time
01/28/2000020003/28/20000000
Subject:
TWP/VCEIL/C1 - Ceilometer offset
DataStreams:twpvceil25kC1.b1
Description:
When the replacement ceilometer was installed at Manus it was tilted 6 degrees.
Since the angle correction setting was not activated, the cloud base heights
reported by the instrument were higher than actual by 0.55% (39 m at 7 km).
Measurements:twpvceil25kC1.b1:
  • Third cloud base height(third_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • Second lowest cloud base height(second_cbh)

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DQRID : D000602.2
Start DateStart TimeEnd DateEnd Time
04/19/1998000008/22/19980000
Subject:
TWP/VCEIL/C1 - Ceilometer clock drift
DataStreams:twpvceil25kC1.00, twpvceil25kC1.a1, twpvceil25kC1.b1
Description:
During this period the ceilometer was using a software version that
provided time stamps that were based on the ceilometer clock and
not the computer clock that was continually sychronized with GPS.
This lead to times that were erroneous by as much as 2 minutes. For
most applications 2 minutes is an acceptable error, but for some
applications this may be a problem.
Measurements:twpvceil25kC1.a1:
  • Flag indicating aeri retrieval status(status_flag)
  • Warning and alarm status bits(status_string)
  • lat(lat)
  • range(range)
  • Degrees from vertical (0 to +90)(tilt_angle)
  • lon(lon)
  • Time offset of tweaks from base_time(time_offset)
  • Dummy altitude for Zeb(alt)
  • Lowest cloud base height detected.(first_cbh)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Third cloud base height(third_cbh)
  • Laser temperature(laser_temperature)
  • Backscatter sum(sum_backscatter)
  • Millivolts at internal ADC input(window_contamination)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Vertical visibility(vertical_visibility)
  • base time(base_time)
  • Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
  • GPS raw data filename(filename)
  • Detection status. See details(detection_status)
  • Altitude of highest signal(alt_highest_signal)
  • 6 character string describing instrument measurement parameters(measurement_parameters)
  • Millivolts at internal ADC input (0 to 2500)(background_light)
  • Second lowest cloud base height(second_cbh)
twpvceil25kC1.00:
  • null(Raw data stream - documentation not supported)
twpvceil25kC1.b1:
  • lat(lat)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Laser temperature(laser_temperature)
  • Second lowest cloud base height(second_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • GPS raw data filename(filename)
  • Backscatter sum(sum_backscatter)
  • Millivolts at internal ADC input(window_contamination)
  • range(range)
  • Time offset of tweaks from base_time(time_offset)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Dummy altitude for Zeb(alt)
  • Detection status. See details(detection_status)
  • Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
  • Vertical visibility(vertical_visibility)
  • Degrees from vertical (0 to +90)(tilt_angle)
  • base time(base_time)
  • 6 character string describing instrument measurement parameters(measurement_parameters)
  • Altitude of highest signal(alt_highest_signal)
  • Millivolts at internal ADC input (0 to 2500)(background_light)
  • Warning and alarm status bits(status_string)
  • Flag indicating aeri retrieval status(status_flag)
  • Third cloud base height(third_cbh)
  • lon(lon)

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DQRID : D000718.7
Start DateStart TimeEnd DateEnd Time
12/11/1996000002/17/19970000
Subject:
TWP/VCEIL/C1 - Extended data gap
DataStreams:twpvceil25kC1.a1, twpvceil25kC1.b1
Description:
There is no ceilometer data for this period.
Measurements:twpvceil25kC1.a1:
  • Third cloud base height(third_cbh)
  • Laser temperature(laser_temperature)
  • Flag indicating aeri retrieval status(status_flag)
  • Millivolts at internal ADC input(window_contamination)
  • Backscatter sum(sum_backscatter)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Vertical visibility(vertical_visibility)
  • Warning and alarm status bits(status_string)
  • lat(lat)
  • base time(base_time)
  • Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
  • range(range)
  • GPS raw data filename(filename)
  • Degrees from vertical (0 to +90)(tilt_angle)
  • Detection status. See details(detection_status)
  • Altitude of highest signal(alt_highest_signal)
  • lon(lon)
  • Time offset of tweaks from base_time(time_offset)
  • Lowest cloud base height detected.(first_cbh)
  • Dummy altitude for Zeb(alt)
  • 6 character string describing instrument measurement parameters(measurement_parameters)
  • Millivolts at internal ADC input (0 to 2500)(background_light)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Second lowest cloud base height(second_cbh)
twpvceil25kC1.b1:
  • lat(lat)
  • Vertical visibility(vertical_visibility)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Laser temperature(laser_temperature)
  • Degrees from vertical (0 to +90)(tilt_angle)
  • base time(base_time)
  • Second lowest cloud base height(second_cbh)
  • 6 character string describing instrument measurement parameters(measurement_parameters)
  • Lowest cloud base height detected.(first_cbh)
  • Millivolts at internal ADC input(window_contamination)
  • Backscatter sum(sum_backscatter)
  • GPS raw data filename(filename)
  • Altitude of highest signal(alt_highest_signal)
  • Millivolts at internal ADC input (0 to 2500)(background_light)
  • Warning and alarm status bits(status_string)
  • range(range)
  • Time offset of tweaks from base_time(time_offset)
  • Third cloud base height(third_cbh)
  • Flag indicating aeri retrieval status(status_flag)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Dummy altitude for Zeb(alt)
  • Detection status. See details(detection_status)
  • lon(lon)
  • Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)

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DQRID : D000718.8
Start DateStart TimeEnd DateEnd Time
03/05/1997155804/06/19970000
Subject:
TWP/VCEIL/C1 - Extended data gap
DataStreams:twpvceil25kC1.a1, twpvceil25kC1.b1
Description:
There is no ceilometer data for this period.
Measurements:twpvceil25kC1.a1:
  • Third cloud base height(third_cbh)
  • Laser temperature(laser_temperature)
  • Flag indicating aeri retrieval status(status_flag)
  • Millivolts at internal ADC input(window_contamination)
  • Backscatter sum(sum_backscatter)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Vertical visibility(vertical_visibility)
  • Warning and alarm status bits(status_string)
  • lat(lat)
  • base time(base_time)
  • Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
  • range(range)
  • GPS raw data filename(filename)
  • Degrees from vertical (0 to +90)(tilt_angle)
  • Detection status. See details(detection_status)
  • Altitude of highest signal(alt_highest_signal)
  • lon(lon)
  • Time offset of tweaks from base_time(time_offset)
  • Lowest cloud base height detected.(first_cbh)
  • Dummy altitude for Zeb(alt)
  • 6 character string describing instrument measurement parameters(measurement_parameters)
  • Millivolts at internal ADC input (0 to 2500)(background_light)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Second lowest cloud base height(second_cbh)
twpvceil25kC1.b1:
  • lat(lat)
  • Vertical visibility(vertical_visibility)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Laser temperature(laser_temperature)
  • Degrees from vertical (0 to +90)(tilt_angle)
  • base time(base_time)
  • Second lowest cloud base height(second_cbh)
  • 6 character string describing instrument measurement parameters(measurement_parameters)
  • Lowest cloud base height detected.(first_cbh)
  • Millivolts at internal ADC input(window_contamination)
  • Backscatter sum(sum_backscatter)
  • GPS raw data filename(filename)
  • Altitude of highest signal(alt_highest_signal)
  • Millivolts at internal ADC input (0 to 2500)(background_light)
  • Warning and alarm status bits(status_string)
  • range(range)
  • Time offset of tweaks from base_time(time_offset)
  • Third cloud base height(third_cbh)
  • Flag indicating aeri retrieval status(status_flag)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Dummy altitude for Zeb(alt)
  • Detection status. See details(detection_status)
  • lon(lon)
  • Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)

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DQRID : D000718.9
Start DateStart TimeEnd DateEnd Time
02/02/1998205804/19/19980700
Subject:
TWP/VCEIL/C1 - Extended data gap
DataStreams:twpvceil25kC1.a1, twpvceil25kC1.b1
Description:
There is no ceilometer data for this period.
Measurements:twpvceil25kC1.a1:
  • Third cloud base height(third_cbh)
  • Laser temperature(laser_temperature)
  • Flag indicating aeri retrieval status(status_flag)
  • Millivolts at internal ADC input(window_contamination)
  • Backscatter sum(sum_backscatter)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Vertical visibility(vertical_visibility)
  • Warning and alarm status bits(status_string)
  • lat(lat)
  • base time(base_time)
  • Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
  • range(range)
  • GPS raw data filename(filename)
  • Degrees from vertical (0 to +90)(tilt_angle)
  • Detection status. See details(detection_status)
  • Altitude of highest signal(alt_highest_signal)
  • lon(lon)
  • Time offset of tweaks from base_time(time_offset)
  • Lowest cloud base height detected.(first_cbh)
  • Dummy altitude for Zeb(alt)
  • 6 character string describing instrument measurement parameters(measurement_parameters)
  • Millivolts at internal ADC input (0 to 2500)(background_light)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Second lowest cloud base height(second_cbh)
twpvceil25kC1.b1:
  • lat(lat)
  • Vertical visibility(vertical_visibility)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Laser temperature(laser_temperature)
  • Degrees from vertical (0 to +90)(tilt_angle)
  • base time(base_time)
  • Second lowest cloud base height(second_cbh)
  • 6 character string describing instrument measurement parameters(measurement_parameters)
  • Lowest cloud base height detected.(first_cbh)
  • Millivolts at internal ADC input(window_contamination)
  • Backscatter sum(sum_backscatter)
  • GPS raw data filename(filename)
  • Altitude of highest signal(alt_highest_signal)
  • Millivolts at internal ADC input (0 to 2500)(background_light)
  • Warning and alarm status bits(status_string)
  • range(range)
  • Time offset of tweaks from base_time(time_offset)
  • Third cloud base height(third_cbh)
  • Flag indicating aeri retrieval status(status_flag)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Dummy altitude for Zeb(alt)
  • Detection status. See details(detection_status)
  • lon(lon)
  • Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)

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DQRID : D000927.2
Start DateStart TimeEnd DateEnd Time
10/28/1999000001/28/20000000
Subject:
TWP/VCEIL/C1 - Degraded Ceilometer Window
DataStreams:twpvceil25kC1.a1, twpvceil25kC1.b1
Description:
Data from the ceilometer during this period is suspect. From 10/28
until about 2/4 the instrument had a deteriorated window.  This
caused the ceilometer to only be able to see cloud heights up to
about 2 km.
Measurements:twpvceil25kC1.a1:
  • Third cloud base height(third_cbh)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Lowest cloud base height detected.(first_cbh)
  • Second lowest cloud base height(second_cbh)
twpvceil25kC1.b1:
  • Third cloud base height(third_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Second lowest cloud base height(second_cbh)

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DQRID : D010222.1
Start DateStart TimeEnd DateEnd Time
11/12/2000000002/09/20010000
Subject:
TWP/VCEIL/C1 - Receiver Problem
DataStreams:twpvceil25kC1.a1, twpvceil25kC1.b1
Description:
The Manus ceilometer had degraded cloud base height due to a receiver problem
Measurements:twpvceil25kC1.a1:
  • Third cloud base height(third_cbh)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Lowest cloud base height detected.(first_cbh)
  • Second lowest cloud base height(second_cbh)
twpvceil25kC1.b1:
  • Third cloud base height(third_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Second lowest cloud base height(second_cbh)

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DQRID : D020207.1
Start DateStart TimeEnd DateEnd Time
11/22/2001000001/18/20020500
Subject:
TWP/VCEIL/C1 - Manus Ceilometer Laser Power Intermittent
DataStreams:twpvceil25kC1.a1, twpvceil25kC1.b1
Description:
Very few cloud heights reported due to bad laser transmitter.

Replaced ceilometer 05:00 GMT 18 Jan. 2002.
Measurements:twpvceil25kC1.a1:
  • Third cloud base height(third_cbh)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Lowest cloud base height detected.(first_cbh)
  • Second lowest cloud base height(second_cbh)
twpvceil25kC1.b1:
  • Third cloud base height(third_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Second lowest cloud base height(second_cbh)

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DQRID : D020207.2
Start DateStart TimeEnd DateEnd Time
01/18/2002050002/08/20020400
Subject:
TWP/VCEIL/C1 - Reprocess: Incorrect units on installed ceilometer
DataStreams:twpvceil25kC1.a1, twpvceil25kC1.b1
Description:
The units setting on the ceilometer installed on 18 Jan. 2002 were incorrectly set to feet 
rather than meters.
Measurements:twpvceil25kC1.a1:
  • Third cloud base height(third_cbh)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Lowest cloud base height detected.(first_cbh)
  • Second lowest cloud base height(second_cbh)
twpvceil25kC1.b1:
  • Third cloud base height(third_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Second lowest cloud base height(second_cbh)

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DQRID : D020620.64
Start DateStart TimeEnd DateEnd Time
10/11/1996080106/22/20002359
Subject:
TWP/C1 - Incorrect elevation reported in Manus Data
DataStreams:twpmplC1.a1, twpvceil25kC1.a1, twpvceil25kC1.b1
Description:
Bill Clements reports we have been using 6m MSL as the station elevation of Momote 
(Manus).  This was based on information posted near the station barometer in the Momote Weather 
Service Office.  It turns out that the official WMO station elevation for Momote is 4m 
MSL and the upper air elevation is 5m MSL.

All Manus instruments except the sonde station are at 4m MSL. The sonde launching station 
is at 5m MSL.
Measurements:twpmplC1.a1:
  • Dummy altitude for Zeb(alt)
twpvceil25kC1.a1:
  • Dummy altitude for Zeb(alt)
twpvceil25kC1.b1:
  • Dummy altitude for Zeb(alt)

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DQRID : D041013.2
Start DateStart TimeEnd DateEnd Time
09/29/2004010011/15/20041520
Subject:
TWP/VCEIL/C1 - Data dropouts
DataStreams:twpvceil25kC1.00, twpvceil25kC1.b1
Description:
The Manus ceilometer was not receiving complete data packs from the ceilometer. This 
occurred at irregular intervals up to 3-10 times per hour until an error occurred and the 
computer locked up.  The data were not affected when they were successfully collected.  Days 
on which the data are missing for more than 1 hour are listed below.  Some maintenance 
was done on the ceilometer data computer in November and the computer was ultimately 
replace on 3 January 2005.

year.month.day
2004.09.29
2004.10.03
2004.10.04
2004.10.07
2004.10.10
2004.10.11
2004.10.12
2004.10.13
2004.10.14
2004.10.17
2004.10.18
2004.10.22
2004.10.25
2004.10.26
2004.10.27
2004.10.28
2004.10.29
2004.10.30
2004.11.15
Measurements:twpvceil25kC1.00:
  • null(Raw data stream - documentation not supported)
twpvceil25kC1.b1:
  • lat(lat)
  • Vertical visibility(vertical_visibility)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Laser temperature(laser_temperature)
  • Degrees from vertical (0 to +90)(tilt_angle)
  • base time(base_time)
  • Second lowest cloud base height(second_cbh)
  • 6 character string describing instrument measurement parameters(measurement_parameters)
  • Lowest cloud base height detected.(first_cbh)
  • GPS raw data filename(filename)
  • Backscatter sum(sum_backscatter)
  • Millivolts at internal ADC input(window_contamination)
  • Altitude of highest signal(alt_highest_signal)
  • Millivolts at internal ADC input (0 to 2500)(background_light)
  • range(range)
  • Warning and alarm status bits(status_string)
  • Time offset of tweaks from base_time(time_offset)
  • Flag indicating aeri retrieval status(status_flag)
  • Third cloud base height(third_cbh)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Dummy altitude for Zeb(alt)
  • lon(lon)
  • Detection status. See details(detection_status)
  • Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)

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END OF DATA