DQR ID | Subject | Data Streams Affected |
---|
D021206.1 | TWP/SONDE/C2 - Broken Temperature Sensor | twpsondewnpnC2.a1, twpsondewnpnC2.b1 |
D030419.1 | TWP/SONDE/C2 - Bad RH Data (AIRS Validation Sonde) | twpsondewnpnC2.a1, twpsondewnpnC2.b1 |
D030608.4 | TWP/SONDE/C2 - Failure of RH sensor | twpsondewnpnC2.a1, twpsondewnpnC2.b1 |
D031008.1 | TWP/SONDE/C2 - Strange problem with data - | twpsondeC2.00, twpsondewnpnC2.00, twpsondewnpnC2.b1 |
D031231.1 | TWP/SONDE/C2 - RH sensor bad | twpsondewnpnC2.b1 |
D040127.3 | TWP/SONDE/C2 - Broken temperature sensors | twpsondewnpnC2.b1 |
D040208.2 | TWP/SONDE/C2 - Questionable rH data | twpsondewnpnC2.b1 |
D040211.4 | TWP/MWR/C2 - thermal instability | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D040219.4 | TWP/SONDE/C2 - Bad RH sensor | twpsondewnpnC2.b1 |
D040425.1 | TWP/SONDE/C2 - Bad RH values aloft | twpsondewnpnC2.b1 |
D040711.2 | TWP/SONDE/C2 - RH sensor failure near surface | twpsondewnpnC2.b1 |
D040815.1 | TWP/SONDE/C2 - Operator used wrong calibration tape | twpsondewnpnC2.b1 |
D040920.1 | TWP/MWR/C2 - Data collection problem | twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1 |
D040921.1 | TWP/SONDE/C2 - RH sensor failure below 9km | twpsondewnpnC2.b1 |
D040921.2 | TWP/SONDE/C2 - Bad RH values aloft | twpsondewnpnC2.b1 |
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 |
D061121.1 | TWP/MWR/C2 - Missing Data | twpmwrlosC2.b1 |
D070920.2 | TWP/SONDE/C2 - Failure of RH sensor | twpsondewnpnC2.b1 |
Subject: | TWP/SONDE/C2 - Strange problem with data - |
DataStreams: | twpsondeC2.00, twpsondewnpnC2.00, twpsondewnpnC2.b1
|
Description: | This is very strange. The data has what appears to be a pressure jump at launch (from
1007.2 to 956.5 hPa) but the sounding temperature and RH data clearly look to be
interpolated between the surface and tropopause. By examining the absolutely raw data, I found that
the system assigned an elapsed time of 408 seconds (since system start up) to the launch
point, but there is no raw data between 410 and 532 seconds. The raw pressure value at
410 seconds is 1007.6 hPa and that at 532 seconds is 40.9 hPa! Unless this sounding was
done by using a rocket-powered balloon (maybe even then), it would be impossible for the
sonde to get to 40.9 hPa in 2 minutes. Because the apparent gap is only two minutes, the
system was able to interpolate but is not sophisticated enough to understand that the
limits of the interpolation are unreasonable.
I can't imagine what went wrong - I've not seen anything like this before. |
Measurements: | twpsondewnpnC2.00: - Raw data stream - documentation not supported
twpsondeC2.00: - Raw data stream - documentation not supported
twpsondewnpnC2.b1: - lon
- Eastward Wind Component(u_wind)
- Northward Wind Component(v_wind)
- asc
- Humidity, relative(rh)
- time_offset
- base_time
- Dewpoint Temperature(dp)
- wstat
- Wind Direction(deg)
- alt
- Mean Wind Speed(wspd)
- Pressure, atmospheric, constant value of model level, RUC model output(pres)
- lat
- Dry Bulb Temperature(tdry)
|
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
- IR Brightness Temperature(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
- IR Brightness Temperature(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
|