DQR ID | Subject | Data Streams Affected |
---|---|---|
D000711.62 | TWP/C1/GNDRAD Net Radiometer: Cracked dome | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D000711.64 | TWP/GNDRAD/C1 - Net Radiometer: Correction for negative net fluxes | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D000711.68 | TWP/GNDRAD/C1 - PIR: Incorrect wiring | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D000711.70 | TWP/GNDRAD/C1 - PIR and IRT: surface temperature comparison | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D000718.20 | TWP/GNDRAD/C1 - PIR: Extended data gap | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D000718.21 | TWP/GNDRAD/C1 - PSP: Comparison test | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D000726.5 | TWP/GNDRAD/C1 - Extended data gap | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D011211.5 | TWP/GNDRAD/C1 - GNDRAD radiometer replacement | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D020620.61 | TWP/C1 - Incorrect elevation reported in Manus Data | twpsmet60sC1.a1, twpsmet60sC1.b1, twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D040813.9 | TWP/GNDRAD/C1 - RESET 14 activities | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D981222.3 | TWP/GNDRAD/C1 - Incorrect dome calibration factor | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0000 | 07/27/1997 | 2359 |
Subject: | TWP/C1/GNDRAD Net Radiometer: Cracked dome |
DataStreams: | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | A crack in the up-looking radiometer dome was discovered on 970227. It is not known how long the dome was cracked. The dome was replaced with a spare, out of calibration unit, on 970227. There was not an obvious change in the instrument performance when the instrument was replaced. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0000 | 11/30/1997 | 2359 |
Subject: | TWP/GNDRAD/C1 - Net Radiometer: Correction for negative net fluxes |
DataStreams: | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | The Net radiometer seems to have a calibration problem and a poor cosine response. The Net radiometer consistently measures low relative to Net surface irradiance calculated from the SKYRAD and GNDRAD Eppleys around local noon. The relative discrepancy changes rapidly with sun angle and the two streams typically cross in mid-morning and mid-afternoon beyond which the Net radiometer reads high relative to the Eppleys. The net radiometer typically reports postive values for the net flux during the day and negative values at night. There are actually different calibration coefficients that must be applied for positive and negative fluxes. Currently, all data are processed by applying the positive flux coefficient. Consequently, the negative values are in error. The net flux, F, is obtained by simply applying the formula F = C*V where V is the measured voltage and C is the calibration factor. Therefore, negative fluxes can be corrected by multiplying the fluxes by the ratio of the negative calibration factor, C_neg to the postive factor C_pos, so the corrected flux for negative values is equal to F_neg = F*C_neg/C_pos where F is the flux value reported in the data files. Through 970227, the values for these calibration factors are F_pos = 9.26 and F_neg = 11.43. After 970227, the calibration factors are F_pos = 9.33 and F_neg = 11.6. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/11/1996 | 0000 | 02/27/1997 | 0659 |
Subject: | TWP/GNDRAD/C1 - PIR: Incorrect wiring |
DataStreams: | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | Data from the GNDRAD PIR is not valid for this period because of an incorrect connection to the data logger. Collection of good data from the PIR resumed on 970227 at 07Z. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
twpgndrad20sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/01/1998 | 0000 | 03/31/1999 | 2359 |
Subject: | TWP/GNDRAD/C1 - PIR and IRT: surface temperature comparison |
DataStreams: | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | The GNDRAD continues to look nominally OK. The daily average irradiances are about what is expected. The comparison of the downward facing IRT and the calculated brightness temperature from the downward facing PIR show agreement within and average of about 0.5O C. About 19981206, the daily average agreement suddenly seems to have gotten better. We should note to monitor this in the next data package. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
twpgndrad20sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/02/1996 | 1400 | 02/28/1997 | 0000 |
Subject: | TWP/GNDRAD/C1 - PIR: Extended data gap |
DataStreams: | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | The lines to the GNDRAD data logger were cut on December 2, 1996 at approximately 1400 GMT. No data was collected from GNDRAD until the lines were reconnected on December 12 at approximately 0200 GMT. The PIR was not reconnected properly, however, and data flow from that instrument did not resume until a RESET visit in February. Data flow for the PIR resumed on February 28, 1997. The IRT and Net radiometer appear to be operating as before, but without the downlooking PIR, we cannot perform any internal tests. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
twpgndrad20sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/23/1997 | 2000 | 02/24/1997 | 2300 |
Subject: | TWP/GNDRAD/C1 - PSP: Comparison test |
DataStreams: | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | The GNDRAD PSP was turned upside-down for comparison with the SKYRAD PSPs. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/02/1996 | 1400 | 12/12/1996 | 0200 |
Subject: | TWP/GNDRAD/C1 - Extended data gap |
DataStreams: | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | The lines to the GNDRAD data logger were cut on December 2, 1996 at approximately 1400 GMT. No data was collected from GNDRAD until the lines were reconnected on December 12 at approximately 0200 GMT. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
twpgndrad20sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/25/2001 | 0000 | 10/25/2001 | 0100 |
Subject: | TWP/GNDRAD/C1 - GNDRAD radiometer replacement |
DataStreams: | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | The GNDRAD radiometers were replaced 10/25/01 from 00:00 to 01:00. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/10/1996 | 0001 | 06/22/2000 | 2359 |
Subject: | TWP/C1 - Incorrect elevation reported in Manus Data |
DataStreams: | twpsmet60sC1.a1, twpsmet60sC1.b1, twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | (From Bill Clements) We have been using 6m MSL as the station elevation of Momote (Manus). This was based on information posted near the station barometer in the Momote Weather Service Office. It turns out that the official WMO station elevation for Momote is 4m MSL and the upper air elevation is 5m MSL. All Manus instruments except the sonde station are at 4m MSL. The sonde launching station is at 5m MSL. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
twpsmet60sC1.b1:
twpgndrad20sC1.a1:
twpsmet60sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/2001 | 0000 | 10/26/2001 | 2359 |
Subject: | TWP/GNDRAD/C1 - RESET 14 activities |
DataStreams: | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | RESET14 activities may have affected data in in subtle ways during this period. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
twpgndrad20sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/1996 | 1943 | 12/09/1998 | 0000 |
Subject: | TWP/GNDRAD/C1 - Incorrect dome calibration factor |
DataStreams: | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | The Manus GNDRAD PIR had an incorrect dome factor since installation. The following is an estimate by Chris Cornwall of the magnitude of the effect of this calibration error. The magnitude of this error is smaller than the calibration accuracy. "Processed the instantaneous data from ARCS2 (10, 30 and 50 seconds after the minute) using 4.32 as the dome factor, and also using 4.00 as the dome factor, as it should have been. The difference between the calculated irradiance results was negligible, as was expected with an instrument operating in the downward-facing direction. Over the three days from 11/06/98 to 11/08/98, the error between the two signals averaged 0.09%. Overnight values were much lower than this, daytime values peaked at 0.42%. The statistics for these error signals were as follows: average error 0.000895 standard dev 0.001119 max error 0.004242 min error -0.00064 We should change ARCS1 so it is using the correct value for the groundrad pir dome coefficient (4.0 instead of 4.32), and we may want to include a DQR stating these findings, although they are much smaller than the overall uncertainty of the PIR itself." |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
twpgndrad20sC1.a1:
|