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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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.

Ensemble Data Assimilation at 2021-06-16 00:00

amsua
METOP-B AMSUA RADIANCES (10 channels affected) : out of range
Considerable: obs_number=5091.0000, expected range: 9760.3380 16785.1620
iasi
METOP-A IASI RADIANCES CHANNEL 176 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0669, expected range: -0.0397 -0.0099
METOP-B IASI RADIANCES CHANNEL 106 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1034, expected range: -0.0494 -0.0059
METOP-C IASI RADIANCES CHANNEL 106 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1681, expected range: -0.1230 -0.0773
METOP-A IASI RADIANCES CHANNEL 3244 : out of range
Considerable: obs_number=441.0000, expected range: 660.7084 1377.1771
METOP-C IASI RADIANCES (64 channels affected) : out of range
Considerable: obs_number=2377.0000, expected range: 2037.1633 2283.0867
airs
AQUA AIRS RADIANCES CHANNEL 672 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1402, expected range: -0.1201 -0.1164
AQUA AIRS RADIANCES CHANNEL 1865 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.1800, expected range: -0.1687 -0.1493
AQUA AIRS RADIANCES CHANNEL 7 : out of range
Considerable: obs_number=770.0000, expected range: 880.9247 1304.8253
AQUA AIRS RADIANCES CHANNEL 138 : out of range
Considerable: obs_number=694.0000, expected range: 844.1286 1295.3714
AQUA AIRS RADIANCES CHANNEL 139 : out of range
Considerable: obs_number=664.0000, expected range: 825.3814 1288.4936
AQUA AIRS RADIANCES CHANNEL 144 : out of range
Considerable: obs_number=605.0000, expected range: 776.0057 1265.8693
AQUA AIRS RADIANCES CHANNEL 145 : out of range
Considerable: obs_number=632.0000, expected range: 801.4001 1272.8499
AQUA AIRS RADIANCES CHANNEL 150 : out of range
Considerable: obs_number=543.0000, expected range: 706.1949 1261.5551
AQUA AIRS RADIANCES CHANNEL 151 : out of range
Considerable: obs_number=574.0000, expected range: 739.1807 1266.0693
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES (6 channels affected) : out of range
Severe: obs_number=49216.0000, expected range: 54881.4014 56107.7236
Atmospheric Motion Vector
METEOSAT-11 AMV CLOUDY WV1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
Considerable: obs_number=2381.0000, expected range: 3112.3579 4047.1421