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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-01-12 12:00

amsua
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.2880, expected range: -0.2526 -0.2326
airs
AQUA AIRS RADIANCES CHANNEL 305 : out of range
2 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.8048, expected range: 0.3585 0.4055
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 3 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_norm_fgdepar=0.1083, expected range: -0.0503 0.0363
Severely_persistent: stdev_norm_fgdepar=0.8760, expected range: 0.7136 0.7209
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 14 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: obs_number=7018.0000, expected range: 7907.5258 8260.9806
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 15 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: obs_number=5968.0000, expected range: 6688.3813 6980.6633
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 5 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0571, expected range: 0.0335 0.0805
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 13 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0243, expected range: 1.5909 2.5618
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 14 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=1.5895, expected range: 4.0758 4.9579
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1397, expected range: -0.2373 -0.2025
ssmis
DMSP-17 SSMIS RADIANCES (6 channels affected) : out of range
Severe: stdev_norm_fgdepar=1.1445, expected range: 0.5245 0.6113
DMSP-17 SSMIS RADIANCES CHANNEL 11 : out of range
Severe: avg_norm_fgdepar=0.0902, expected range: -0.0957 0.0009
DMSP-17 SSMIS RADIANCES CHANNEL 18 : out of range
Severe: avg_norm_fgdepar=0.1027, expected range: -0.0151 0.0128
DMSP-18 SSMIS RADIANCES CHANNEL 9 : out of range
Severe: obs_number=5066.0000, expected range: 16267.9941 19575.7707
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
Severe: obs_number=4811.0000, expected range: 21682.1441 24963.1500
Severe: avg_norm_fgdepar=0.1476, expected range: -0.0801 -0.0037
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
Severe: obs_number=3195.0000, expected range: 21693.5629 25027.0254
Severe: avg_norm_fgdepar=0.0642, expected range: -0.0852 -0.0116
DMSP-18 SSMIS RADIANCES (5 channels affected) : out of range
Severe: stdev_norm_fgdepar=1.3448, expected range: 0.5386 0.6349
DMSP-18 SSMIS RADIANCES CHANNEL 18 : out of range
Severe: avg_norm_fgdepar=0.0947, expected range: -0.0198 0.0167
Severe: avg_biascorr=1.6848, expected range: -1.8885 -1.0039
DMSP-17 SSMIS RADIANCES (5 channels affected) : out of range
Considerable: obs_number=6392.0000, expected range: 15144.3836 20439.9693
Atmospheric Motion Vector
METEOSAT-8 AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=969.0000, expected range: 236.4858 722.9852