DQR ID | Subject | Data Streams Affected |
---|---|---|
D040428.1 | TWP/SMET/C1 - Poor Performing Sensor | twpsmet60sC1.b1 |
D040824.3 | TWP/SMET/C1 - Incorrect rainrate equation used | twpsmet60sC1.b1 |
D060804.1 | TWP/SKYRAD/C2 - IRT signal loss | twpskyrad60sC2.b1 |
D060817.3 | TWP/SMET/C1 - Reprocess: Barometric pressure units change | twpsmet60sC1.b1 |
D061011.2 | TWP/SMET/C1 - Reprocess: Tipping bucket rain gauge added | twpsmet60sC1.b1 |
D061016.1 | TWP/SKYRAD/C2 - IRT signal | twpskyrad60sC2.b1 |
D061120.1 | TWP/SKYRAD/C3 - NIP Failure | twpskyrad20sC3.a0, twpskyrad60sC3.b1 |
D070206.1 | TWP/SKYRAD/C2 - Short direct normal | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
D070404.2 | TWP/SKYRAD/C2 - IRT measurement error | twpskyrad60sC2.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/23/2004 | 0000 | 01/19/2005 | 1530 |
Subject: | TWP/SMET/C1 - Poor Performing Sensor |
DataStreams: | twpsmet60sC1.b1 |
Description: | On 4/23/2004 condensation was found inside the target area of the ORG lens. A spare was sent and installed but did not solve the problem of high background voltage values causing rainrate values to be recorded during no rainfall. Values range anywhere from 0.06 to 0.12 mm/hr. A new Optical Rain Gage was installed on 01/19/2005 @ 13:30 GMT alleviating the high background voltage values that lead to consistent rainfall rates of around 0.11 to 0.15 mm/hr on a consistent basis. The formula used to calculate rainfall rates from the new Optical Rain Gage is: RR (mm/hr) = 25(V^1.87) - 0.15. Older model formula = 20(V^2) - 0.05 The two formulas result in comparable data. |
Measurements: | twpsmet60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/03/2004 | 0307 | 08/17/2004 | 2138 |
Subject: | TWP/SMET/C1 - Incorrect rainrate equation used |
DataStreams: | twpsmet60sC1.b1 |
Description: | There are two different Optical Raingages in use at the TWP sites. The incorrect equation was used at this site. The incorrect equation is (25*(V^1.87)) - 0.15. The correct equation is (20*(V^2)) - 0.05. The correct equation was installed. |
Measurements: | twpsmet60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/19/2006 | 2239 | 07/24/2006 | 0727 |
Subject: | TWP/SKYRAD/C2 - IRT signal loss |
DataStreams: | twpskyrad60sC2.b1 |
Description: | There was a significant drop in logger voltage that corresponds with a loss of the IR temperature. This was possibly due to a loose connection. |
Measurements: | twpskyrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/1996 | 0000 | 08/02/2004 | 1911 |
Subject: | TWP/SMET/C1 - Reprocess: Barometric pressure units change |
DataStreams: | twpsmet60sC1.b1 |
Description: | Barometric pressure data during this time period is reported in hPa. After this time, the data have been converted to kPa to standardize the measurement units among ARM sites and to conform to accepted standard units determined by the scientific community. |
Measurements: | twpsmet60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/1996 | 0000 | 10/17/2006 | 0000 |
Subject: | TWP/SMET/C1 - Reprocess: Tipping bucket rain gauge added |
DataStreams: | twpsmet60sC1.b1 |
Description: | A tipping bucket rain gauge was added to the TWP.C1 SMET suite of instruments on 20061017. Effective 20060926, two new variables (count and rain amount) were added to the end of the twpsmet60sC1.b1 datastream. Between 9/26 and 10/17, the data for these two variables are filled with zeros. Users should not use the data during this period as the zeros are not representative of the rain fall at the site. When reprocessing of this datastream occurs these variables will be added for the 19961009-20060926 and data from 19961009-20061017 will be filled with -9999 (missing). |
Measurements: | twpsmet60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/13/2006 | 0135 | 12/04/2006 | 2120 |
Subject: | TWP/SKYRAD/C2 - IRT signal |
DataStreams: | twpskyrad60sC2.b1 |
Description: | The IRT exhibited a bias of the analog voltage output that caused problems with the signals from the other SKYRAD radiometers. The bias was due to corrosion between the power and signal connections in the IRT cable. The IRT was disconnected on 10/18/2006 at 01:20 and replaced on 11/6/2006 at 23:00 but it too appeared to have grounding problems due to internal corrosion and was disconnected on 11/11/2006 at 11:42 and then intermittently reconnected for testing. A second spare was installed on 12/4/2006 which did not cause problems with the signals from the other instruments. |
Measurements: | twpskyrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/16/2006 | 2006 | 11/20/2006 | 0630 |
Subject: | TWP/SKYRAD/C3 - NIP Failure |
DataStreams: | twpskyrad20sC3.a0, twpskyrad60sC3.b1 |
Description: | Skyrad normal incident shortwave irradiance (NIP) started reporting impossible values for direct normal irradiance starting 16 November approx 2100GMT corresponding to a rain event at the same time. The NIP was replaced fixing the problem. Direct normal data are not recoverable. However, the NIP data can be calculated from the global hemsipherical shortwave and global hemispherical diffuse datastreams by using the following relationship: Global Horizontal = Direct Normal x cos(Z) + Diffuse Horizontal where Z is the zenith angle. |
Measurements: | twpskyrad60sC3.b1:
twpskyrad20sC3.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/31/2007 | 0223 | 02/10/2007 | 0055 |
Subject: | TWP/SKYRAD/C2 - Short direct normal |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
Description: | The short_direct_normal (NIP) data are missing or incorrect due to instrument cable failure. The cable was replaced. The short_direct_normal can be calculated using the following relationship for shortwave radiometers: global hemispheric = diffuse hemispheric + direct normal *cos (zenith angle) |
Measurements: | twpskyrad60sC2.b1:
twpskyrad20sC2.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/04/2006 | 2120 | 02/22/2007 | 0125 |
Subject: | TWP/SKYRAD/C2 - IRT measurement error |
DataStreams: | twpskyrad60sC2.b1 |
Description: | The IRT was not properly calibrated and was not able to measure sky temperatures below 273.2 K. (This instrument was the same one damaged by lightning in November 2005 in Darwin. It was returned for repair and received a new lens but was calibrated only down to 0 deg C, so the problem was neither detected nor repaired.) The IRT was replaced on 2/22/2007. |
Measurements: | twpskyrad60sC2.b1:
|