DQRs for Session: 134501 User:chiujCompleted: 04-15-2011

Data Quality Reports for Session: 134501 User: chiuj Completed: 04/15/2011

TABLE OF CONTENTS

DQR ID	Subject	Data Streams Affected
D001205.1	SGP/MWR/C1 - Time drift	sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
D030312.10	SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures	sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgp1mwravgC1.c1, sgp5mwravgC1.c1

DQRID : D001205.1

Start Date	Start Time	End Date	End Time
05/05/2000	1955	09/18/2000	2145

Subject:	SGP/MWR/C1 - Time drift
DataStreams:	sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:	On 9/18/00, I found that the time on the MWR laptop was 1m 21s slow. The Dimension4 utility had last synchronized the time on 5/5/00. Found that the network DNS settings had been disabled. Added the DNS entry for ntp host CF10. Dimension4 synchronized the clock by adding 80.91s. The time had drifted at a rate of -0.59s/day.
Measurements:	sgpmwrtipC1.a1: time_offset tipsky23 tipsky31 tnd31I r23 bbn31 tnd_nom23 tkair actaz tbsky31tip tnd23 tc23 actel liqtip tnd23I tbsky23tip tknd tkbb tkxc wet_window bb23 tnd31 tc31 vaptip bbn23 r31 tnd_nom31 base_time bb31 sgpmwrlosC1.a1: tknd tnd31 wet_window tnd23 tkair 31.4 GHz sky brightness temperature(tbsky31) tnd_nom23 time_offset tnd_nom31 tc23 bb23 bbn31 Total water vapor along LOS path(vap) Total liquid water along LOS path(liq) sky31 tkbb tc31 23.8 GHz sky brightness temperature(tbsky23) tkxc sky23 bb31 bbn23 Temperature, Sky Infra-Red(sky_ir_temp) base_time sgpmwrlosC1.b1: wet_window bbn31 tkair sky23 tnd23 base_time tnd31 tknd bbn23 tkxc tnd_nom31 23.8 GHz sky brightness temperature(tbsky23) tc31 Total liquid water along LOS path(liq) tkbb sky31 tc23 time_offset bb31 Total water vapor along LOS path(vap) bb23 tnd_nom23 31.4 GHz sky brightness temperature(tbsky31) Temperature, Sky Infra-Red(sky_ir_temp)

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DQRID : D030312.10

Start Date	Start Time	End Date	End Time
11/17/1999	1800	07/31/2002	2034

Subject:	SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures
DataStreams:	sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgp1mwravgC1.c1, sgp5mwravgC1.c1
Description:	Several related and recurring problems with the SGP MWRs have been reported dating back to 1999. These problems were due to the occurrence of blackbody signals (in counts) that were half of those expected. The symptoms included noisy data (especially at Purcell), spikes in the data (especially at Vici), negative brightness temperatures, and apparent loss of serial communication between the computer and the radiometer, which results in a self-termination of the MWR program (especially at the CF). Because these all initially appeared to be hardware-related problems, the instrument mentor and SGP site operations personnel (1) repeatedly cleaned and replaced the fiber optic comm. components, (2) swapped radiometers, (3) sent radiometers back to Radiometrics for evaluation (which has not revealed any instrument problems), and (4) reconfigured the computer's operating system. Despite several attempts to isolate and correct it, the problem persisted. It became apparent that some component of the Windows98 configuration conflicted with the DOS-based MWR program or affected the serial port or the contents of the serial port buffer. This problem was finally corrected by upgrading the MWR software with a new Windows-compatible program.
Measurements:	sgp5mwravgC1.c1: Total water vapor along LOS path(vap) Total liquid water along LOS path(liq) 31.4 GHz sky brightness temperature(tbsky31) 23.8 GHz sky brightness temperature(tbsky23) sgp1mwravgC1.c1: Total water vapor along LOS path(vap) 23.8 GHz sky brightness temperature(tbsky23) 31.4 GHz sky brightness temperature(tbsky31) Total liquid water along LOS path(liq) sgpmwrlosC1.a1: Total water vapor along LOS path(vap) Total liquid water along LOS path(liq) 31.4 GHz sky brightness temperature(tbsky31) 23.8 GHz sky brightness temperature(tbsky23) sgpmwrlosC1.b1: 31.4 GHz sky brightness temperature(tbsky31) 23.8 GHz sky brightness temperature(tbsky23) Total liquid water along LOS path(liq) Total water vapor along LOS path(vap)

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