DQRs for Session: 153293 User:aeroundCompleted: 09-30-2013

Data Quality Reports for Session: 153293 User: aeround Completed: 09/30/2013

TABLE OF CONTENTS

DQR ID	Subject	Data Streams Affected
D100616.2	NSA/VCEIL/C1 - Small gaps in data	nsavceil25kC1.b1
D100719.1	NSA/VCEIL/C1 - Gaps in data	nsavceil25kC1.b1
D130502.3	NSA/VCEIL/C1 - Reprocess: Time error	nsavceil25kC1.a1, nsavceil25kC1.b1

DQRID : D100616.2

Start Date	Start Time	End Date	End Time
12/03/2009	2107	06/15/2010	2143

Subject:	NSA/VCEIL/C1 - Small gaps in data
DataStreams:	nsavceil25kC1.b1
Description:	When the ceilometer was replaced, small gaps in the netCDF files occurred due to the presence of '?' characters in the backscatter and header records of the raw data that could not be ingested. It is unknown whether this was caused by a poor CPU board or incompatibilities with the computer configuration (hyper-threading). The problem was corrected when the instrument and computer were both replaced. During this period, approximately 3% of data are missing each hour due to this problem.
Measurements:	nsavceil25kC1.b1: Third cloud base height(third_cbh) alt_highest_signal laser_temperature receiver_sensitivity Second lowest cloud base height(second_cbh) Lowest cloud base height detected.(first_cbh) vertical_visibility tilt_angle time_offset measurement_parameters status_flag sum_backscatter range base_time Normalized corrected relative backscatter(backscatter) status_string background_light window_contamination detection_status laser_pulse_energy

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DQRID : D100719.1

Start Date	Start Time	End Date	End Time
06/15/2010	2159	06/17/2010	2201

Subject:	NSA/VCEIL/C1 - Gaps in data
DataStreams:	nsavceil25kC1.b1
Description:	When the CT25K ceilometer was replaced with a new CL31, checksum errors began occurring at regular 6-min intervals and several things were done to diagnose the problem, including changing the serial cable and trying different computer types. It was finally corrected by replacing the computer with one in which hyperthreading was disabled by default in the BIOS.
Measurements:	nsavceil25kC1.b1: Third cloud base height(third_cbh) alt_highest_signal laser_temperature receiver_sensitivity Second lowest cloud base height(second_cbh) Lowest cloud base height detected.(first_cbh) vertical_visibility tilt_angle time_offset measurement_parameters status_flag sum_backscatter range base_time Normalized corrected relative backscatter(backscatter) status_string background_light window_contamination detection_status laser_pulse_energy

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DQRID : D130502.3

Start Date	Start Time	End Date	End Time
03/31/2013	0100	04/15/2013	1540

Subject:	NSA/VCEIL/C1 - Reprocess: Time error
DataStreams:	nsavceil25kC1.a1, nsavceil25kC1.b1
Description:	The computer time jumped forward an hour because the time zone was set to "(GMT) Greenwich Mean Time" with "Automatically adjust clock for Daylight Savings Time" selected. The time zone was changed to "(GMT) Coordinated Universal Time" and the clock reset to correct UTC time. Correct time by subtracting 1 hour.
Measurements:	nsavceil25kC1.b1: time_offset nsavceil25kC1.a1: time_offset

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