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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

AMSUA Pacific RARS
All NOAA-18 AMSUA ALL SKY CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 641.76 889.24
All NOAA-19 AMSUA ALL SKY CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 206.72 1544.85
iasi
METOP-B IASI RADIANCES CHANNEL 756 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1008, expected range: -0.0919 -0.0814
METOP-B IASI RADIANCES CHANNEL 254 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0889, expected range: 0.1062 0.1165
METOP-B IASI RADIANCES CHANNEL 212 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0992, expected range: -0.2502 -0.0512
METOP-B IASI RADIANCES CHANNEL 278 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0179, expected range: 0.1534 0.2911
METOP-B IASI RADIANCES CHANNEL 284 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0137, expected range: 0.1078 0.1936
METOP-B IASI RADIANCES CHANNEL 286 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0805, expected range: 0.0494 0.1818
METOP-B IASI RADIANCES CHANNEL 1578 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0876, expected range: 0.0216 0.0452
METOP-C IASI RADIANCES CHANNEL 205 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0575, expected range: -0.3687 -0.1304
METOP-C IASI RADIANCES CHANNEL 212 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0325, expected range: -0.3000 -0.1208
METOP-C IASI RADIANCES CHANNEL 278 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0222, expected range: 0.1087 0.2408
METOP-C IASI RADIANCES CHANNEL 284 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0425, expected range: 0.0842 0.1924
METOP-C IASI RADIANCES CHANNEL 1578 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0802, expected range: -0.0315 0.0177
METOP-B IASI RADIANCES CHANNEL 386 : out of range
1 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.2775, expected range: 0.2417 0.2743
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES (5 channels affected) : out of range
Slight: obs_number=35337.0000, expected range: 48044.4502 61799.4322
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 10 : out of range
Considerable: obs_number=9853.0000, expected range: 11058.6175 12113.2648
DMSP-17 SSMIS RADIANCES CHANNEL 11 : out of range
Considerable: obs_number=9935.0000, expected range: 11222.5957 12194.4632
gpsro
All KOMPSAT-5 GPSRO SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 190.62 863.12
Atmospheric Motion Vector
AQUA MODIS CLOUDY WV WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HP : out of range
1 times in the last 10 days for at least one item
Severe: stdev_press=61.5544, expected range: 35.4877 43.2742
NPP VIIRS AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Slight: obs_number=567.0000, expected range: 30.3499 337.3463
scatt
HY-2B SCATTEROMETER WIND VECTOR DIFF (M/S) : out of range
Slight: obs_number=66202.0000, expected range: 99469.6754 143912.2069