| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D021110.2 | SGP/SONDE/B4 - Soundings contaminated by interference | sgplssondeB4.c1, sgpqmemwrcolB4.c1, sgpsondewnpnB4.a1, sgpsondewnpnB4.b1 |
| D021112.2 | SGP/SONDE/B4 - Possible interference in B4 sounding 20021110.1729 | sgpsondeB4.00, sgpsondewnpnB4.a1, sgpsondewnpnB4.b1 |
| D021117.2 | SGP/SONDE/B4 - B4 sounding contaminated by interference | sgpsondewnpnB4.a1, sgpsondewnpnB4.b1, sgpsondeB4.00 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/07/2002 | 1130 | 11/07/2002 | 1316 |
| 11/07/2002 | 1429 | 11/07/2002 | 1629 |
| 11/07/2002 | 1730 | 11/07/2002 | 1930 |
| 11/07/2002 | 2029 | 11/07/2002 | 2239 |
| 11/07/2002 | 2331 | 11/08/2002 | 0131 |
| Subject: | SGP/SONDE/B4 - Soundings contaminated by interference |
| DataStreams: | sgplssondeB4.c1, sgpqmemwrcolB4.c1, sgpsondewnpnB4.a1, sgpsondewnpnB4.b1 |
| Description: | These five soundings, done in succession on 11/07/2002 as part of the SCM/IOP are contaminated by interference. I can't tell whether the problem has to do with improper tuning of the radiosondes, inadequate frequency separation among radiosondes launched from different locations, or some other operator problem. I suspect that there is an operator component to the difficulty because the surface pressure is given as an unreasonably low 896.6 hPa on the 1730 sounding and 886.1 hPa on the 2331 sounding. This may indicate that the ground station was locked another station's radiosonde rather than on the B4 radiosonde. |
| Measurements: | sgplssondeB4.c1:
sgpsondewnpnB4.b1:
sgpqmemwrcolB4.c1:
sgpsondewnpnB4.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/10/2002 | 1824 | 11/10/2002 | 1848 |
| Subject: | SGP/SONDE/B4 - Possible interference in B4 sounding 20021110.1729 |
| DataStreams: | sgpsondeB4.00, sgpsondewnpnB4.a1, sgpsondewnpnB4.b1 |
| Description: | There is a strange inversion aloft in the subject sounding. The temperature goes from -56.3 degC to -51.5 degC in less than two minutes (approximately .72 km). This is somewhat below the estimated tropopause height. I suspect this may be an interference problem, but note that both the recorded pressure and RH values are reasonably continuous. More accurate assessment would require analysis of the absolutely raw binary data; something that would require effort beyond the limits of my IM funding. |
| Measurements: | sgpsondewnpnB4.b1:
sgpsondeB4.00:
sgpsondewnpnB4.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/14/2002 | 0830 | 11/14/2002 | 1010 |
| Subject: | SGP/SONDE/B4 - B4 sounding contaminated by interference |
| DataStreams: | sgpsondewnpnB4.a1, sgpsondewnpnB4.b1, sgpsondeB4.00 |
| Description: | Much of this sounding is contaminated, apparently by interference from another sonde signal. It is still no clear why this seems to happen more frequently at B4 than the other sites, especially since the wind seems to have been from the west and B4 should be the most upwind station. |
| Measurements: | sgpsondewnpnB4.b1:
sgpsondeB4.00:
sgpsondewnpnB4.a1:
|