Operational Data Checking

An automatic data checking system has been implemented at ECMWF to trigger warnings in case of anomalies affecting the quality or the availability of the data assimilated by the model. Selected statistical parameters (number of observations, bias correction, and mean bias-corrected background, analysis departures and probability of gross error) are checked against an expected range. An appropriate alert message (including a time series plot) is generated if statistics are outside the specified ranges. A severity level (slight, considerable, severe) is assigned to each message depending on how far statistics are from the expected values. Two kinds of ranges are used by the automatic checking: Soft and Hard limits. Soft limits are updated automatically using statistics from the last twenty days (extremes are excluded during this process). Hard limits are adjusted manually when required.

Currently, the automatic checking is limited to data passing through the minimisation process (including VarBC passive data). It's being applied twice a day to the delayed cut-off 4D-VAR cycles (00 and 12) and four times a day to the early delivery assimilation system (00,06,12 and 18).

The alarm system results are based on feedback information from the ECMWF data assimilation and consequently reflect the ECMWF data usage. Although most warnings are related to data problems, they may on occasion also be related to model issues. Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice. ECMWF accepts no responsibility for actions taken on the basis of these results.

Early delivery 4D-VAR at 2021-05-09 00:00

iasi
METOP-A IASI RADIANCES CHANNEL 236 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0237, expected range: -0.0045 -0.0030
METOP-A IASI RADIANCES CHANNEL 249 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1892, expected range: -0.1708 -0.1496
METOP-A IASI RADIANCES CHANNEL 256 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2994, expected range: -0.2713 -0.2616
METOP-A IASI RADIANCES CHANNEL 286 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6804, expected range: -0.6236 -0.6102
METOP-B IASI RADIANCES CHANNEL 256 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2418, expected range: -0.2109 -0.2072
METOP-B IASI RADIANCES CHANNEL 249 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1413, expected range: -0.1174 -0.1034
METOP-B IASI RADIANCES CHANNEL 286 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6277, expected range: -0.5799 -0.5570
cris
NPP CRIS RADIANCES CHANNEL 94 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1058, expected range: 0.1229 0.1298
NPP CRIS RADIANCES CHANNEL 120 : out of range
32 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0636, expected range: -0.0534 -0.0488
NPP CRIS RADIANCES CHANNEL 126 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0720, expected range: -0.0621 -0.0618
NOAA20 CRIS RADIANCES (19 channels affected) : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0141, expected range: 0.0245 0.0260
NOAA20 CRIS RADIANCES CHANNEL 92 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1677, expected range: 0.1857 0.1870
NOAA20 CRIS RADIANCES CHANNEL 93 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1489, expected range: 0.1656 0.1722
NOAA20 CRIS RADIANCES CHANNEL 101 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0813, expected range: 0.1038 0.1067
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0483, expected range: 0.0597 0.0670
NOAA20 CRIS RADIANCES CHANNEL 140 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1160, expected range: -0.1073 -0.1036
NPP CRIS RADIANCES (19 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.1129, expected range: -0.1026 -0.0894
airs
AQUA AIRS RADIANCES CHANNEL 232 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7711, expected range: -0.7164 -0.6673
AQUA AIRS RADIANCES CHANNEL 1865 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2510, expected range: 0.2076 0.2091
AQUA AIRS RADIANCES CHANNEL 221 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.8198, expected range: -0.7566 -0.7281
AQUA AIRS RADIANCES (15 channels affected) : out of range
Considerable: obs_number=488.0000, expected range: 775.3355 775.3355
Atmospheric Motion Vector
DUAL-METOP AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
2 times in the last 10 days for at least one item
Considerable: stdev_press=26.9031, expected range: 29.1295 31.7729
HIMAWARI-8 AMV CLOUDY WV1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=487.0000, expected range: 258.4559 408.8775