DQR ID | Subject | Data Streams Affected |
---|
D000127.1 | TWP/MWR/C2 - Uncertainty in clock time | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D000609.1 | TWP/MWR/C2 - Installation | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D010227.4 | TWP/MWR/C2 - Excessive wet_window flags | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D040211.4 | TWP/MWR/C2 - thermal instability | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D040920.1 | TWP/MWR/C2 - Data collection problem | twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1 |
D050310.3 | TWP/MWR/C2 - Heater problem | twpmwrlosC2.b1, twpmwrtipC2.a1, twp5mwravgC2.c1 |
D050524.2 | TWP/MWR/C2 - mixer temperature | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D050725.10 | TWP/MWR/C2 - Reprocessed: Revised Retrieval Coefficients | twpmwrlosC2.b1, twp5mwravgC2.c1, twpqmemwrcolC2.c1 |
D050928.2 | TWP/MWR/C2 - New software version (4.15) installed | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D060420.10 | TWP/MWR/C2 - software upgrade (version 3.29) | twpmwrlosC2.b1 |
D061002.1 | TWP/MWR/C2 - Missing data | twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1, twp5mwravgC2.c1 |
D061121.1 | TWP/MWR/C2 - Missing Data | twpmwrlosC2.b1 |
D061213.3 | TWP/MWR/C2 - Reprocessed: New Calibration coefficients | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D070412.3 | TWP/MWR/C1/C2 - Sun in the field of view | twpmwrlosC1.b1, twpmwrlosC2.b1, twpmwrtipC1.a1, twpmwrtipC2.a1 |
D081216.1 | TWP/MWR/C2 - Incorrect ambient temperature during rain | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D090417.3 | TWP/MWR/C2 - Intermittent data | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D990107.1 | TWP/MWR/C2 - Software Change | twpmwrlosC2.b1 |
Subject: | TWP/MWR/C2 - Uncertainty in clock time |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1
|
Description: | At ARCS2, the MWR computer clock was not being updated because no NTP time service
software was installed on the computer. During Nauru99, on 6/24/99, the clock was found to be 3
minutes and 17 seconds fast.
Assuming that the time was properly set at installation on 10/26/98 (which is not
indicated in the installation report) and never reset until 6/24/99, the rate of time drift on
the computer was about +0.8 seconds per day. However, if the time was not reset since
integration at AIS on 1/14/98 (which is recorded in my integration notes), then the rate of
drift is about +0.4 seconds per day.
The computer was replaced and time service started on 7/30/99. |
Measurements: | twpmwrtipC2.a1: - tipsky23
- tkair
- base_time
- tnd_nom31
- tkxc
- actaz
- wet_window
- r23
- tnd23I
- tc23
- time_offset
- tnd_nom23
- tnd23
- r31
- bb23
- bbn31
- tkbb
- bbn23
- tnd31
- tc31
- tknd
- bb31
- actel
- tnd31I
- tipsky31
twpmwrlosC2.b1: - tnd23
- sky23
- Total liquid water along LOS path(liq)
- bbn23
- tkbb
- tc23
- tkxc
- tnd31
- bbn31
- base_time
- tnd_nom23
- Temperature, Sky Infra-Red(sky_ir_temp)
- time_offset
- bb31
- Temperature, brightness, longwave(ir_temp)
- actel
- wet_window
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
- sky31
- 31.4 GHz sky brightness temperature(tbsky31)
- tnd_nom31
- tkair
- tknd
- Total water vapor along LOS path(vap)
- bb23
- tc31
- actaz
|
Subject: | TWP/MWR/C2 - Installation |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1
|
Description: | The Nauru ARCS was installed during the period September-November
1998. Data were being collected by the end of October, but for the
first several weeks of November, the site was undergoing considerable
change, so data from that period should be used with caution. The
official site dedication occured on November 20. Most on-site
activity ended following the dedication so we will consider November
20 to be the beginning of the Nauru operations. The last members of
the installation team left Nauru on November 24. |
Measurements: | twpmwrtipC2.a1: - bb23
- tipsky23
- bbn31
- tkair
- tkbb
- tnd_nom31
- tkxc
- actaz
- tnd31
- bbn23
- wet_window
- tc31
- r23
- tknd
- tnd23I
- bb31
- tc23
- tnd_nom23
- actel
- tnd23
- tnd31I
- r31
- tipsky31
twpmwrlosC2.b1: - tnd_nom23
- Temperature, Sky Infra-Red(sky_ir_temp)
- tnd23
- sky23
- Total liquid water along LOS path(liq)
- bbn23
- bb31
- Temperature, brightness, longwave(ir_temp)
- actel
- wet_window
- tkbb
- tc23
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
- 31.4 GHz sky brightness temperature(tbsky31)
- sky31
- tnd_nom31
- tkair
- tkxc
- Total water vapor along LOS path(vap)
- tknd
- tnd31
- bb23
- bbn31
- tc31
- actaz
|
Subject: | TWP/MWR/C2 - thermal instability |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1
|
Description: | The MWR required an unusually long time to reach thermal stability after a 4-day outage
due to a power failure that damaged the blower/heater assembly. Also during this period,
the heater, which had been replaced, appears to have been on continously, causing the data
to be inappropriately flagged. |
Measurements: | twpmwrtipC2.a1: - tipsky23
- tc23
- tnd_nom23
- tnd_nom31
- wet_window
- tc31
- tipsky31
twpmwrlosC2.b1: - tnd_nom23
- sky31
- 31.4 GHz sky brightness temperature(tbsky31)
- sky23
- tnd_nom31
- Total liquid water along LOS path(liq)
- Total water vapor along LOS path(vap)
- tc31
- wet_window
- tc23
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
|
Subject: | TWP/MWR/C2 - Data collection problem |
DataStreams: | twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1
|
Description: | Large, frequent data gaps occurred due to a failing laptop computer. The problem was
corrected when a new computer was installed. |
Measurements: | twpmwrtipC2.a1: - tipsky23
- tkair
- base_time
- tnd_nom31
- tkxc
- actaz
- wet_window
- r23
- tnd23I
- tc23
- time_offset
- tnd_nom23
- tnd23
- lat
- r31
- bb23
- bbn31
- tkbb
- bbn23
- tnd31
- tc31
- tknd
- alt
- bb31
- actel
- tnd31I
- lon
- tipsky31
twpmwrC2.00: - Raw data stream - documentation not supported
twpmwrlosC2.b1: - tnd23
- sky23
- Total liquid water along LOS path(liq)
- bbn23
- tkbb
- tc23
- tkxc
- tnd31
- bbn31
- base_time
- tnd_nom23
- Temperature, Sky Infra-Red(sky_ir_temp)
- lat
- lon
- time_offset
- bb31
- Temperature, brightness, longwave(ir_temp)
- actel
- wet_window
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
- sky31
- 31.4 GHz sky brightness temperature(tbsky31)
- tnd_nom31
- tkair
- tknd
- Total water vapor along LOS path(vap)
- bb23
- alt
- tc31
- actaz
|
Subject: | TWP/MWR/C2 - Reprocessed: Revised Retrieval Coefficients |
DataStreams: | twpmwrlosC2.b1, twp5mwravgC2.c1, twpqmemwrcolC2.c1
|
Description: | IN THE BEGINNING (June 1992), the retrieval coefficients used to derive the precipitable
water vapor (PWV) and liquid water path (LWP) from the MWR brightness temperatures were
based on the Liebe and Layton (1987) water vapor and oxygen absorption model and the Grant
(1957) liquid water absorption model.
Following the SHEBA experience, revised retrievals based on the more recent Rosenkranz
(1998) water vapor and oxygen absorption models and the Liebe (1991) liquid waer absorption
model were developed. The Rosenkranz water vapor absorption model resulted a 2 percent
increase in PWV relative to the earlier Liebe and Layton model. The Liebe liquid water
absorption model decreased the LWP by 10% relative to the Grant model. However, the
increased oxygen absorption caused a 0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was
particularly significant for low LWP conditions (i.e. thin clouds encountered at SHEBA).
Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and Clough, TGARS v. 43,
pp 1102-1108, 2005) that the half-width of the 22 GHz water vapor line from the HITRAN
compilation, which is 5 percent smaller than the Liebe and Dillon (1969) half-width used in
Rosenkranz (1998), provided a better fit to the microwave brightness temperature
measurements at 5 frequencies in the range 22-30 GHz, and yielded more accurate retrievals.
Accordingly, revised MWR retrieval coefficients have been developed using MONORTM, which
utilizes the HITRAN compilation for its spectroscopic parameters. These new retrievals
provide 3 percent less PWV and 2.6 percent greater LWP than the previous
retrievals based on Rosenkranz (1998).
The Rosenkranz-based retrieval coefficients became active at TWP.C2 20020427.0600. The
MONORTM-based retrieval coefficients became active at TWP.C2 20050630.2100.
Note: The TWP.C2 data for 19981028-20050630 have been reprocessed to apply the
MONORTM-based retrievals for all time. The reprocessed data were archived 20061003. |
Measurements: | twpqmemwrcolC2.c1:
twp5mwravgC2.c1: - Total liquid water along LOS path(liq)
- Total water vapor along LOS path(vap)
twpmwrlosC2.b1: - Total liquid water along LOS path(liq)
- Total water vapor along LOS path(vap)
|
Subject: | TWP/MWR/C2 - New software version (4.15) installed |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1
|
Description: | A problem began with the installation of MWR.EXE version 4.12 in November 2002. The
software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier
problem. The software upgrade corrected the earlier problem but introduced a new one that
caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of
tip curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced
these problems.
The new MWR software version (4.15) was installed on 9/15/2005. As a consequence of this
upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
Measurements: | twpmwrtipC2.a1: - tipsky23
- bbn31
- tkair
- tkbb
- tnd_nom31
- tkxc
- tnd31
- bbn23
- tc31
- r23
- tknd
- tnd23I
- bb31
- tc23
- tnd_nom23
- tnd23
- tnd31I
- r31
- tipsky31
twpmwrlosC2.b1: - tnd_nom23
- Temperature, Sky Infra-Red(sky_ir_temp)
- tnd23
- sky23
- Total liquid water along LOS path(liq)
- bbn23
- bb31
- Temperature, brightness, longwave(ir_temp)
- tkbb
- tc23
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
- 31.4 GHz sky brightness temperature(tbsky31)
- sky31
- tnd_nom31
- tkxc
- tkair
- Total water vapor along LOS path(vap)
- tknd
- tnd31
- bb23
- bbn31
- tc31
|
Subject: | TWP/MWR/C2 - Missing data |
DataStreams: | twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1, twp5mwravgC2.c1
|
Description: | The heater blower assembly was causing the fuse to blow. The instrument was taken offline
until a replacement arrives. |
Measurements: | twpmwrtipC2.a1: - tipsky23
- tkair
- base_time
- tnd_nom31
- tkxc
- actaz
- wet_window
- r23
- tnd23I
- tc23
- time_offset
- tnd_nom23
- tnd23
- lat
- r31
- bb23
- bbn31
- tkbb
- bbn23
- tnd31
- tc31
- tknd
- alt
- bb31
- actel
- tnd31I
- lon
- tipsky31
twp5mwravgC2.c1: - tbsky31_sdev
- Total liquid water along LOS path(liq)
- time_offset
- lat
- vap_sdev
- ir_temp_sdev
- Temperature, brightness, longwave(ir_temp)
- base_time
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
- tbsky23_sdev
- alt
- water_flag_fraction
- lon
- 31.4 GHz sky brightness temperature(tbsky31)
- liq_sdev
- num_obs
- num_obs_irt
- Total water vapor along LOS path(vap)
twpmwrC2.00: - Raw data stream - documentation not supported
twpmwrlosC2.b1: - tnd23
- sky23
- Total liquid water along LOS path(liq)
- bbn23
- tkbb
- tc23
- tkxc
- tnd31
- bbn31
- base_time
- tnd_nom23
- Temperature, Sky Infra-Red(sky_ir_temp)
- lat
- lon
- time_offset
- bb31
- Temperature, brightness, longwave(ir_temp)
- actel
- wet_window
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
- 31.4 GHz sky brightness temperature(tbsky31)
- sky31
- tnd_nom31
- tkair
- tknd
- Total water vapor along LOS path(vap)
- bb23
- alt
- tc31
- actaz
|
Subject: | TWP/MWR/C1/C2 - Sun in the field of view |
DataStreams: | twpmwrlosC1.b1, twpmwrlosC2.b1, twpmwrtipC1.a1, twpmwrtipC2.a1
|
Description: | Every day between around noon local time (usually between 1 and 2 AM UTC time) there is an
increase in the brightness temperatures due to the sun in the field of view of the
radiometer.
The effect lasts less than an hour around local noon (usually between 1 and 2 AM UTC
time). The effect appears as a smooth increase and decrease in brightness temperature. |
Measurements: | twpmwrtipC2.a1:
twpmwrtipC1.a1: - vaptip
- liqtip
- tbskytip23
- tbskytip31
twpmwrlosC1.b1: - Total liquid water along LOS path(liq)
- sky23
- 31.4 GHz sky brightness temperature(tbsky31)
- sky31
- Total water vapor along LOS path(vap)
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
twpmwrlosC2.b1: - 31.4 GHz sky brightness temperature(tbsky31)
- sky31
- sky23
- Total liquid water along LOS path(liq)
- Total water vapor along LOS path(vap)
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
|
Subject: | TWP/MWR/C2 - Intermittent data |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1
|
Description: | There are several short data gaps (usually 2 to 7 hours) in the data due to computer
malfunction. The problem was solved by replacing the computer. |
Measurements: | twpmwrtipC2.a1: - tipsky23
- tkair
- base_time
- tnd_nom31
- tkxc
- actaz
- wet_window
- r23
- tnd23I
- tc23
- time_offset
- tnd_nom23
- tnd23
- lat
- r31
- bb23
- bbn31
- tkbb
- bbn23
- tnd31
- tc31
- tknd
- alt
- bb31
- actel
- tnd31I
- lon
- tipsky31
twpmwrlosC2.b1: - tnd23
- sky23
- Total liquid water along LOS path(liq)
- bbn23
- tkbb
- tc23
- tkxc
- tnd31
- bbn31
- base_time
- tnd_nom23
- Temperature, Sky Infra-Red(sky_ir_temp)
- lat
- lon
- time_offset
- bb31
- Temperature, brightness, longwave(ir_temp)
- actel
- wet_window
- Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
- sky31
- 31.4 GHz sky brightness temperature(tbsky31)
- tnd_nom31
- tkair
- tknd
- Total water vapor along LOS path(vap)
- bb23
- alt
- tc31
- actaz
|
Subject: | TWP/MWR/C2 - Software Change |
DataStreams: | twpmwrlosC2.b1
|
Description: | The MWR operating software was changed on 19 November 1998 to provide additional
functionality as described below.
NEW FEATURES
1. Faster sampling rate
Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs.
20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per
blackbody sample and gain update.)
2. More flexible sampling strategy
Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update.
This permits sky samples to be acquired at intervals of 2.67 seconds for improved
temporal resolution of cloud liquid water variations and better coordination with the millimeter
cloud radar during IOPs.
3. Separation of zenith LOS observations from TIP data
When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV
and LWP computed and reported separately in the output file. This eliminates the periods
of missing LOS data during calibration checks/updates.
4. Automatic self-calibration
The software now permits the calibration to be updated at specified intervals or
continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified
intervals or whenever clear sky conditions occur, the tip data reduced, the calibration
updated, and the radiometer returned to LOS mode without operator intervention. In the
second case, the radiometer is continuously is TIP mode until changed by the operator.
5. Graphical user display
The graphical display is comprised of a status display, a message display, a temperature
plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip
curves. |
Measurements: | twpmwrlosC2.b1:
|