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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-01-07 12:00

amsua
NOAA-18 AMSUA RADIANCES CHANNEL 9 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5058, expected range: -0.8673 -0.6717
METOP-A AMSUA RADIANCES CHANNEL 9 : out of range
28 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2649, expected range: 0.0168 0.1084
All AQUA AMSUA ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 3248.81 6038.90
iasi
METOP-A IASI RADIANCES CHANNEL 207 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3174, expected range: -0.2803 -0.2359
METOP-A IASI RADIANCES CHANNEL 214 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1627, expected range: -0.1293 -0.0857
METOP-A IASI RADIANCES CHANNEL 222 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0344, expected range: 0.0557 0.0803
METOP-A IASI RADIANCES CHANNEL 5399 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0564, expected range: 0.1097 0.1777
METOP-B IASI RADIANCES CHANNEL 222 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0833, expected range: 0.0990 0.1182
METOP-B IASI RADIANCES CHANNEL 1509 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0510, expected range: -0.0775 -0.0650
METOP-B IASI RADIANCES CHANNEL 1513 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1284, expected range: 0.0491 0.0574
METOP-B IASI RADIANCES CHANNEL 1658 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3483, expected range: 0.2637 0.3059
METOP-C IASI RADIANCES (11 channels affected) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3601, expected range: -0.3285 -0.3107
METOP-C IASI RADIANCES CHANNEL 1509 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0301, expected range: -0.1441 -0.0611
METOP-C IASI RADIANCES CHANNEL 1513 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1599, expected range: 0.0963 0.1303
METOP-C IASI RADIANCES CHANNEL 1521 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0553, expected range: -0.0110 0.0186
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 2818.25 10418.33
atms
NOAA20 ATMS RADIANCES CHANNEL 9 : out of range
23 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5002, expected range: -0.7025 -0.6009
gpsro
All COSMIC-6 GPSRO SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1204.48
amdar
WIGOS AMDAR WIND VECTOR DIFF (M/S) (3 pressure layers affected) : missing
Severe: obs_number=0.0000, expected range: 0.0000 894.6731
All ADS-C ALL LAYERS North Atlantic : all data missing
Severe: obs_number=0, expected range: 532.91 4072.34
All ADS-C ALL LAYERS North West Pacific : all data missing
Severe: obs_number=0, expected range: 25.05 3385.23
All ADS-C ALL LAYERS North East Pacific : all data missing
Severe: obs_number=0, expected range: 661.43 1828.68
All ADS-C ALL LAYERS South Est Pacific : all data missing
Severe: obs_number=0, expected range: 44.74 449.89
All ADS-C ALL LAYERS Indian Ocean : all data missing
Severe: obs_number=0, expected range: 74.06 624.11
All ADS-C ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 4086.35 8345.54
All ADS-C ALL LAYERS Tropics : all data missing
Severe: obs_number=0, expected range: 529.23 1472.89
All ADS-C ALL LAYERS Alantic Tropical are : all data missing
Severe: obs_number=0, expected range: 0.00 475.98
All ADS-C ALL LAYERS West pacific Tropica : all data missing
Severe: obs_number=0, expected range: 0.00 522.97
All ADS-C ALL LAYERS East pacific Tropica : all data missing
Severe: obs_number=0, expected range: 66.02 801.93
All ADS-C ALL LAYERS Indian Ocean Tropica : all data missing
Severe: obs_number=0, expected range: 27.42 354.41
All ADS-C ALL LAYERS North pole : all data missing
Severe: obs_number=0, expected range: 0.00 458.27