| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D050310.3 | TWP/MWR/C2 - Heater problem | twp5mwravgC2.c1, twpmwrlosC2.b1, twpmwrtipC2.a1 |
| D050725.10 | TWP/MWR/C2 - Reprocessed: Revised Retrieval Coefficients | twp5mwravgC2.c1, twpmwrlosC2.b1, twpqmemwrcolC2.c1 |
| D050725.9 | TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficients | twp5mwravgC1.c1, twpmwrlosC1.b1, twpmwrtipC1.a1 |
| D061002.1 | TWP/MWR/C2 - Missing data | twp5mwravgC2.c1, twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/04/2005 | 2340 | 03/14/2005 | 1650 |
| Subject: | TWP/MWR/C2 - Heater problem |
| DataStreams: | twp5mwravgC2.c1, twpmwrlosC2.b1, twpmwrtipC2.a1 |
| Description: | When the wiring of the air temperature sensor was checked the heater apparently began activating too often. |
| Measurements: | twpmwrlosC2.b1:
twp5mwravgC2.c1:
twpmwrtipC2.a1:
|
| 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: | twp5mwravgC2.c1, twpmwrlosC2.b1, 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: | twpmwrlosC2.b1:
twpqmemwrcolC2.c1:
twp5mwravgC2.c1:
|
| 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: | twp5mwravgC1.c1, twpmwrlosC1.b1, twpmwrtipC1.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). 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: | twpmwrlosC1.b1:
twp5mwravgC1.c1:
twpmwrtipC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/14/2006 | 1500 | 11/27/2006 | 1900 |
| Subject: | TWP/MWR/C2 - Missing data |
| DataStreams: | twp5mwravgC2.c1, twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1 |
| Description: | The heater blower assembly was causing the fuse to blow. The instrument was taken offline until a replacement arrives. |
| Measurements: | twpmwrlosC2.b1:
twpmwrC2.00:
twp5mwravgC2.c1:
twpmwrtipC2.a1:
|