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 |
D000717.1 | TWP/MWR/C1 - Rain on window | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D010227.4 | TWP/MWR/C2 - Excessive wet_window flags | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D021004.17 | TWP/MWR/C3 - Elevated Skybrightness Temperatures | twpmwrlosC3.a1, twpmwrlosC3.b1 |
D021004.18 | TWP/MWR/C3 - Wet Window Flag not correct | twpmwrlosC3.a1, twpmwrlosC3.b1, twpmwrtipC3.a1 |
D030312.8 | TWP/MWR/C3 - Intermittent Negative Sky Brightness Temperatures | twpmwrlosC3.a1, twpmwrlosC3.b1 |
D030312.9 | TWP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures | twpmwrlosC1.b1 |
D030822.11 | TWP/MWR/C3 - min/max/delta values incorrect | twpmwrlosC3.b1 |
D040211.4 | TWP/MWR/C2 - thermal instability | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D040220.1 | TWP/MWR/C1 - wrong azimuth | twpmwrlosC1.b1 |
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 |
D050725.11 | TWP/MWR/C3 - Reprocess - Revised Retrieval Coefficients | twpmwrlosC3.a1, twpmwrlosC3.b1, twpmwrtipC3.a1 |
D050725.9 | TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficients | twpmwrlosC1.b1, twpmwrtipC1.a1, twp5mwravgC1.c1 |
D050928.1 | TWP/MWR/C1 - New software version (4.15) installed | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D050928.2 | TWP/MWR/C2 - New software version (4.15) installed | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D050928.5 | TWP/MWR/C3 - New software version (4.15) installed | twpmwrlosC3.b1, twpmwrtipC3.a1 |
D051114.2 | TWP/MWR/C3 - Instrument failure, Power outage | twpmwrC3.00, twpmwrlosC3.a1, twpmwrlosC3.b1, twpmwrtipC3.a1 |
D051214.1 | TWP/MWR/C3 - REPROCESS- Updated retrieval coefficients | twpmwrlosC3.b1, twpmwrtipC3.a1 |
D060420.10 | TWP/MWR/C2 - software upgrade (version 3.29) | twpmwrlosC2.b1 |
D060420.6 | TWP/MWR/C1 - Software Change | twpmwrlosC1.b1 |
D060420.9 | TWP/MWR/C1 - software upgrade (version 3.29) | twpmwrlosC1.b1 |
D060601.1 | TWP/MWR/C3 - Site shutdown | twpmwrC3.00, twpmwrlosC3.a1, twpmwrlosC3.b1, twpmwrtipC3.a1 |
D061002.1 | TWP/MWR/C2 - Missing data | twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1, twp5mwravgC2.c1 |
D061114.2 | TWP/MWR/C1 - Radiometer failure | twpmwrC1.00, twpmwrlosC1.b1, twpmwrtipC1.a1 |
D061114.4 | TWP/MWR/C3 - Sun in field of view of radiometer | twpmwrlosC3.b1, twpmwrtipC3.a1 |
D061121.1 | TWP/MWR/C2 - Missing Data | twpmwrlosC2.b1 |
D061213.3 | TWP/MWR/C2 - Reprocessed: New Calibration coefficients | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D070105.1 | TWP/MWR/C1 - Missing data | twpmwrlosC1.b1 |
D070412.3 | TWP/MWR/C1/C2 - Sun in the field of view | twpmwrlosC1.b1, twpmwrlosC2.b1, twpmwrtipC1.a1, twpmwrtipC2.a1 |
D070613.1 | TWP/MWR/C1 - Intermittent data | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D071208.1 | TWP/MWR/C1 - Incorrect ambient temperature readings | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D081013.2 | TWP/MWR/C1 - Short periods of wrong ambient temperature | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D081216.1 | TWP/MWR/C2 - Incorrect ambient temperature during rain | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D090114.4 | TWP/MWR/C1 - Ambient temperature data missing | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D090417.3 | TWP/MWR/C2 - Intermittent data | twpmwrlosC2.b1, twpmwrtipC2.a1 |
D990107.1 | TWP/MWR/C2 - Software Change | twpmwrlosC2.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/06/1998 | 0000 | 07/30/1999 | 2359 |
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:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/06/1998 | 2141 | 11/19/1998 | 2359 |
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:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/25/1997 | 0000 | 11/13/1997 | 0000 |
12/01/1997 | 0000 | 01/13/1998 | 0000 |
04/01/1998 | 0000 | 03/31/1999 | 0000 |
Subject: | TWP/MWR/C1 - Rain on window |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | The data is subject to contamination due to rain on the sensor window and should be used with caution because the heater/blower assembly that prevents water from accumulating on the sensor's teflon window was out of commission. |
Measurements: | twpmwrtipC1.a1:
twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/16/1999 | 0900 | 03/08/1999 | 2100 |
11/16/1999 | 0900 | 02/09/2000 | 2100 |
12/07/2000 | 0000 | 12/17/2000 | 2359 |
Subject: | TWP/MWR/C2 - Excessive wet_window flags |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1 |
Description: | The wet_window flag is set high more than expected from the measured value of liquid water path. This may be caused by dew or, if the heater sensivity is slightly misadjusted, by the diurnal variation in ambient temperature. The "wet_window" flag is an indicator of moisture on the MWR window which invalidates the measurements of precipitable water vapor and liquid water path. Sometimes this flag can be incorrectly set high or low if the heater sensivity is slightly misadjusted. The heater adjustment is a resistive device that is dependent on ambient temperature. Another indicator of moisture on the window is unreasonably high ( > 3*liquid_retrieval_rms_accuracy ) values of "liq". |
Measurements: | twpmwrtipC2.a1:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/05/2002 | 2212 | 10/02/2002 | 2359 |
Subject: | TWP/MWR/C3 - Elevated Skybrightness Temperatures |
DataStreams: | twpmwrlosC3.a1, twpmwrlosC3.b1 |
Description: | For an unknown reason, the MWR began to exhibit elevated sky brightness temperatures. This problem was corrected when the instrument was power-cycled. |
Measurements: | twpmwrlosC3.b1:
twpmwrlosC3.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/28/2002 | 0000 | 10/02/2002 | 2359 |
Subject: | TWP/MWR/C3 - Wet Window Flag not correct |
DataStreams: | twpmwrlosC3.a1, twpmwrlosC3.b1, twpmwrtipC3.a1 |
Description: | The moisture sensor threshold voltage in the MWR configuration file was set to the wrong value for the new heater/blower assembly. This caused the wet window flag to not be set high during times of rain. |
Measurements: | twpmwrlosC3.b1:
twpmwrlosC3.a1:
twpmwrtipC3.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/27/2002 | 0151 | 10/02/2002 | 2359 |
Subject: | TWP/MWR/C3 - Intermittent Negative Sky Brightness Temperatures |
DataStreams: | twpmwrlosC3.a1, twpmwrlosC3.b1 |
Description: | Several related and recurring problems with the 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, spikes in the data, 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. 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 did 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 (MWR version 4.12). |
Measurements: | twpmwrlosC3.b1:
twpmwrlosC3.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/04/2002 | 2200 | 10/31/2002 | 2220 |
Subject: | TWP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures |
DataStreams: | twpmwrlosC1.b1 |
Description: | Several related and recurring problems with the 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, spikes in the data, 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. 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 did 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: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/27/2002 | 0152 | 02/09/2003 | 2359 |
Subject: | TWP/MWR/C3 - min/max/delta values incorrect |
DataStreams: | twpmwrlosC3.b1 |
Description: | The values of valid_min, valid_max, and valid_delta for fields tkxc and tknd were incorrect. They should be 303, 333, and 0.5 K, respectively. |
Measurements: | twpmwrlosC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/27/2004 | 1958 | 01/31/2004 | 2059 |
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:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0000 | 02/18/2004 | 2250 |
Subject: | TWP/MWR/C1 - wrong azimuth |
DataStreams: | twpmwrlosC1.b1 |
Description: | The MWR was initially installed at an azimuth angle defined as 180 degrees but the value in the configuration file was not changed from the default of 0 degrees. In examining photos taken during the installation of the AWS tower, I noticed that the MWR was rotated opposite the normal orientation. The value in the configuration file was changed to reflect the actual azimuth of the instrument. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/27/2004 | 2000 | 09/24/2004 | 0219 |
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:
twpmwrC2.00:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/04/2005 | 2340 | 03/14/2005 | 1650 |
Subject: | TWP/MWR/C2 - Heater problem |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1, twp5mwravgC2.c1 |
Description: | When the wiring of the air temperature sensor was checked the heater apparently began activating too often. |
Measurements: | twpmwrtipC2.a1:
twp5mwravgC2.c1:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/04/2005 | 2340 | 04/19/2005 | 0242 |
Subject: | TWP/MWR/C2 - mixer temperature |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1 |
Description: | When the wiring of the air temperature sensor was checked the mixer temperature unexpectedly decreased 4 degrees. It increased to its normal value when the dielectric window was replaced. The problem was probably caused by a loose and/or corroded connection. |
Measurements: | twpmwrtipC2.a1:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/27/2002 | 0600 | 06/30/2005 | 2100 |
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:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/27/2002 | 0151 | 06/30/2005 | 2100 |
Subject: | TWP/MWR/C3 - Reprocess - Revised Retrieval Coefficients |
DataStreams: | twpmwrlosC3.a1, twpmwrlosC3.b1, twpmwrtipC3.a1 |
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). Although the MWR data will be reprocessed to apply the new monortm-based retrievals, for most purposes it will be sufficient to correct the data using the following factors: PWV_MONORTM = 0.9695 * PWV_ROSENKRANZ LWP_MONORTM = 1.026 * LWP_ROSENKRANZ The Rosenkranz-based retrieval coefficients was active at TWP.C3 from inception of the data, 20020227.0151. The MONORTM-based retrieval coefficients became active at TWP.C3 20050630.2100. Note: a reprocessing effort is already underway to apply the Rosenkranz-based retrieval coefficients to all MWR prior to April 2002. An additional reprocessing task will be undertaken to apply the MONORTM retrieval to all MWR data when the first is completed. Read reprocessing comments in the netcdf file header carefully to ensure you are aware which retrieval is in play. |
Measurements: | twpmwrlosC3.b1:
twpmwrlosC3.a1:
twpmwrtipC3.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/04/2002 | 0200 | 06/30/2005 | 2100 |
Subject: | TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficients |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1, twp5mwravgC1.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.C1 20020504.0200. The MONORTM-based retrieval coefficients became active at TWP.C1 20050630.2100. Note: The TWP.C1 data for 19961011-20050630 have been reprocessed to apply the |
Measurements: | twp5mwravgC1.c1:
twpmwrtipC1.a1:
twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/31/2002 | 2200 | 09/13/2005 | 1854 |
Subject: | TWP/MWR/C1 - New software version (4.15) installed |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | A problem began with the installation of MWR.EXE version 4.12 in October 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 9/13/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
Measurements: | twpmwrtipC1.a1:
twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/01/2002 | 2101 | 09/15/2005 | 1424 |
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:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/03/2002 | 0000 | 09/20/2005 | 2156 |
Subject: | TWP/MWR/C3 - New software version (4.15) installed |
DataStreams: | twpmwrlosC3.b1, twpmwrtipC3.a1 |
Description: | A problem began with the installation of MWR.EXE version 4.12 in October 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 9/20/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
Measurements: | twpmwrlosC3.b1:
twpmwrtipC3.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/14/2005 | 0453 | 12/10/2005 | 0000 |
Subject: | TWP/MWR/C3 - Instrument failure, Power outage |
DataStreams: | twpmwrC3.00, twpmwrlosC3.a1, twpmwrlosC3.b1, twpmwrtipC3.a1 |
Description: | A lightning strike sent the MWR offline. The radiometer suffered extensive damage, was removed from the site and sent to the vendor for repair. A spare radiometer was sent to the TWP/C3 site and was installed on 12/07. However, some hardaware communication issues prevented data collection until 12/10. |
Measurements: | twpmwrlosC3.b1:
twpmwrlosC3.a1:
twpmwrC3.00:
twpmwrtipC3.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/27/2002 | 0000 | 12/12/2005 | 1600 |
Subject: | TWP/MWR/C3 - REPROCESS- Updated retrieval coefficients |
DataStreams: | twpmwrlosC3.b1, twpmwrtipC3.a1 |
Description: | The statistical retrieval coefficients currently in use at the Darwin (TWP/C3) site were developed using radiosonde RS80 launched from Manus Island during the TOGA-COARE experiment. Data from Manus Island have minimal seasonality, therefore a single, annual set of coefficients was used at all three sites. Retrievals using these coefficients are sufficiently accurate especially during the local summer months (December-January). However, the Darwin site displays a summer/winter seasonality resulting in larger differences during the southern winter (May- June). Since we now have enough radiosonde soundings (RS80 and RS90) available at the Darwin site, the Darwin coefficients were modified to better reflect the local seasonality. |
Measurements: | twpmwrlosC3.b1:
twpmwrtipC3.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/28/1998 | 0000 | 07/30/1999 | 1200 |
Subject: | TWP/MWR/C2 - software upgrade (version 3.29) |
DataStreams: | twpmwrlosC2.b1 |
Description: | The MWR operating program was upgraded to version 3.29 on 30 July 1999. This version included a beam width correction as well as provided the capability to automatically level the elevation mirror (that is, to automatically detect and correct offsets in the elevation angle stepper motor position.) The improvement in the quality of the tip curves resulting from the auto-leveling has been dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 degrees) have been reduced from +/- 5 K to +/- 0.5 K. In order to take full advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998. The data prior to July 30 1999 do not include beam-width and mirror-leveling corrections. |
Measurements: | twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0000 | 02/27/1999 | 1200 |
Subject: | TWP/MWR/C1 - Software Change |
DataStreams: | twpmwrlosC1.b1 |
Description: | The MWR operating software was changed on 27 February 1999 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: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0000 | 03/15/1999 | 1700 |
Subject: | TWP/MWR/C1 - software upgrade (version 3.29) |
DataStreams: | twpmwrlosC1.b1 |
Description: | The MWR operating program was upgraded to version 3.29 on 15 March 1999. This version included a beam width correction as well as provided the capability to automatically level the elevation mirror (that is, to automatically detect and correct offsets in the elevation angle stepper motor position.) The improvement in the quality of the tip curves resulting from the auto-leveling has been dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 degrees) have been reduced from +/- 5 K to +/- 0.5 K. In order to take full advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/24/2006 | 0000 | 04/25/2006 | 2259 |
Subject: | TWP/MWR/C3 - Site shutdown |
DataStreams: | twpmwrC3.00, twpmwrlosC3.a1, twpmwrlosC3.b1, twpmwrtipC3.a1 |
Description: | On 4/24, the site was shutdown in preparation for a cyclone. Instruments were back up on 4/25 at 22:59 |
Measurements: | twpmwrlosC3.b1:
twpmwrlosC3.a1:
twpmwrC3.00:
twpmwrtipC3.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/14/2006 | 1500 | 11/27/2006 | 1900 |
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:
twp5mwravgC2.c1:
twpmwrC2.00:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/2006 | 1000 | 01/30/2007 | 0457 |
Subject: | TWP/MWR/C1 - Radiometer failure |
DataStreams: | twpmwrC1.00, twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | The instrument stopped responding and had to be powered off. Suspect cause of failure is a faulty digital board. |
Measurements: | twpmwrC1.00:
twpmwrtipC1.a1:
twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/20/2006 | 0000 | 11/09/2006 | 0400 |
10/15/2008 | 0000 | 11/08/2008 | 0000 |
10/15/2009 | 0000 | 11/10/2009 | 0000 |
02/01/2010 | 0000 | 03/01/2010 | 0000 |
Subject: | TWP/MWR/C3 - Sun in field of view of radiometer |
DataStreams: | twpmwrlosC3.b1, twpmwrtipC3.a1 |
Description: | Each day around local noon (2-3 AM UTC), there is an increase in the brightness temperature due to the sun being in the field of view of the radiometer. |
Measurements: | twpmwrlosC3.b1:
twpmwrtipC3.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/02/1998 | 2112 | 11/06/1998 | 2140 |
07/02/2000 | 2000 | 07/04/2000 | 0047 |
02/09/2002 | 2300 | 02/11/2002 | 2300 |
01/23/2004 | 1100 | 01/27/2004 | 1957 |
05/27/2005 | 1143 | 05/29/2005 | 2132 |
Subject: | TWP/MWR/C2 - Missing Data |
DataStreams: | twpmwrlosC2.b1 |
Description: | Data are missing and unrecoverable. |
Measurements: | twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/27/2006 | 1900 | 11/30/2006 | 0700 |
Subject: | TWP/MWR/C2 - Reprocessed: New Calibration coefficients |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1 |
Description: | On 11/27 a spare radiometer was installed to replace a faulty radiometer. Once the radiometer started to collect data it used the default calibration coefficients until it collected enough tip data to determine its own coefficients. The data were reprocessed to apply corrected calibrations and the reprocessed data were archived 20061222. |
Measurements: | twpmwrtipC2.a1:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/09/1996 | 2338 | 12/11/1996 | 0003 |
02/28/1997 | 0118 | 06/27/1997 | 2048 |
11/06/1997 | 1959 | 11/12/1997 | 1800 |
01/05/1998 | 0204 | 01/08/1998 | 2048 |
04/21/1998 | 0017 | 04/29/1998 | 1803 |
09/13/1998 | 0759 | 09/20/1998 | 0900 |
11/20/1998 | 2226 | 11/27/1998 | 1026 |
02/27/1999 | 0600 | 03/02/1999 | 0159 |
03/06/1999 | 0800 | 03/09/1999 | 1807 |
09/03/1999 | 0300 | 09/10/1999 | 0400 |
10/01/1999 | 0900 | 10/18/1999 | 0000 |
10/20/1999 | 0500 | 10/22/1999 | 0600 |
01/14/2000 | 0800 | 01/16/2000 | 0342 |
01/14/2006 | 1258 | 01/16/2006 | 0638 |
Subject: | TWP/MWR/C1 - Missing data |
DataStreams: | twpmwrlosC1.b1 |
Description: | Data are missing and unrecoverable. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/07/2007 | 0000 | 04/02/2007 | 2359 |
03/01/2008 | 0000 | 04/02/2008 | 2359 |
09/10/2008 | 0000 | 10/12/2008 | 0000 |
03/01/2009 | 0000 | 04/02/2009 | 2359 |
09/11/2009 | 0000 | 10/10/2009 | 2359 |
03/01/2010 | 0000 | 04/02/2010 | 2359 |
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:
twpmwrlosC1.b1:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/12/2007 | 0700 | 06/13/2007 | 2000 |
06/16/2007 | 2100 | 06/17/2007 | 2100 |
Subject: | TWP/MWR/C1 - Intermittent data |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | After a computer change the MWR program did not restart properly. Data are intermittent between 6/12 and 6/17. |
Measurements: | twpmwrtipC1.a1:
twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/21/2007 | 0000 | 12/11/2007 | 0355 |
Subject: | TWP/MWR/C1 - Incorrect ambient temperature readings |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | Starting on 11/21 the ambient temperature readings are intermittent and have spikes. Site operators replaced the dew-blower on 12/11 and readings came back to normal |
Measurements: | twpmwrtipC1.a1:
twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/01/2008 | 0000 | 09/30/2008 | 2359 |
Subject: | TWP/MWR/C1 - Short periods of wrong ambient temperature |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | During this month there are a few intermittent instances of bad ambient temperature readings. I will summarize here these short time ranges: 20080909 between 02:00 and 03:00 UTC 20080909 between 09:00 and 14:00 UTC Additionally the ambient temperature has short but frequent data gaps. The data gaps are very short (less than one hour). Users could interpolate missing data or use alternative sensors such as the surface meteorological data available for the site. |
Measurements: | twpmwrtipC1.a1:
twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/2008 | 0100 | 01/09/2009 | 0300 |
Subject: | TWP/MWR/C2 - Incorrect ambient temperature during rain |
DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1 |
Description: | The ambient temperature was approximately 15 degree higher than what it should be when it was raining and the heater came. On Jan 9 2009 the dewblower was replaced which solved the problem. The increased ambient temperature (tkair) was happening during times of rain and users should always disregard MWR data during rain events. Therefore this DQR is colored transparent. |
Measurements: | twpmwrtipC2.a1:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/03/2008 | 1900 | 02/06/2009 | 0530 |
Subject: | TWP/MWR/C1 - Ambient temperature data missing |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | The ambient temperature readings (tkair) suddenly failed. The sensor was replaced on Feb 6. |
Measurements: | twpmwrtipC1.a1:
twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/06/2009 | 1600 | 03/14/2009 | 2200 |
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:
twpmwrlosC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/28/1998 | 0000 | 11/19/1998 | 0500 |
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:
|