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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

iasi
METOP-B IASI RADIANCES CHANNEL 167 : out of range
Considerable: obs_number=2531.0000, expected range: 2036.0904 2429.4096
airs
AQUA AIRS RADIANCES CHANNEL 305 : out of range
1 times in the last 10 days for at least one item
Severe: stdev_fgdepar=1.0011, expected range: 0.3587 0.4058
mhs
METOP-B MHS ALLSKY RADIANCES CHANNEL 1 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.1396, expected range: 0.1071 0.1245
METOP-B MHS ALLSKY RADIANCES CHANNEL 5 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: obs_number=5525.0000, expected range: 6595.8093 7086.7072
METOP-B MHS ALLSKY RADIANCES CHANNEL 4 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0719, expected range: -0.1819 -0.0428
mwhs2
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=6404.0000, expected range: 7907.5258 8065.1006
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=5431.0000, expected range: 6688.3813 6816.4690
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 5 : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0038, expected range: 0.0335 0.0811
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0309, expected range: 1.5909 2.4799
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 14 : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=1.4457, expected range: 4.0758 4.9579
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 2 : out of range
2 times in the last 10 days for at least one item
Severe: avg_norm_fgdepar=-0.1637, expected range: -0.0391 0.0332
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 3 : out of range
4 times in the last 10 days for at least one item
Severe: avg_norm_fgdepar=2.2599, expected range: -0.0476 0.0352
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1388, expected range: -0.2344 -0.2025
NPP ATMS RADIANCES CHANNEL 13 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.3405, expected range: -0.2951 -0.2854
NPP ATMS RADIANCES (7 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=1725.0000, expected range: 2994.0703 3478.3047
NOAA20 ATMS RADIANCES (7 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=2161.0000, expected range: 3306.1425 3493.4825
gpsro
COSMIC2-E1 GPSRO RISING HEIGHT 10-12 KM : out of range
Slight: avg_norm_fgdepar=-0.1465, expected range: -0.1112 0.0279
Atmospheric Motion Vector
NPP VIIRS AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
3 times in the last 10 days for at least one item
Severe: avg_press=439.2607, expected range: 367.5099 396.0398
METEOSAT-8 AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=845.0000, expected range: 172.9908 574.8941
NOAA20 VIIRS-AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA : out of range
4 times in the last 10 days for at least one item
Considerable: avg_press=430.5972, expected range: 356.0645 393.9966