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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-06-11 00:00

amsua
NOAA-19 AMSUA RADIANCES CHANNEL 14 : out of range
2 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=1.1252, expected range: 0.8510 1.0239
METOP-A AMSUA RADIANCES (8 channels affected) : out of range
Considerable: obs_number=10262.0000, expected range: 13279.8766 19883.2484
iasi
METOP-A IASI RADIANCES CHANNEL 312 : out of range
Severe: avg_biascorr=-0.2383, expected range: -0.2150 -0.1896
METOP-C IASI RADIANCES CHANNEL 1578 : out of range
Severe: avg_biascorr=-0.4507, expected range: -0.4228 -0.3946
METOP-A IASI RADIANCES CHANNEL 1578 : out of range
Considerable: avg_biascorr=-0.4498, expected range: -0.4246 -0.3905
METOP-A IASI RADIANCES CHANNEL 1579 : out of range
Considerable: avg_biascorr=-0.3940, expected range: -0.3671 -0.3178
METOP-A IASI RADIANCES CHANNEL 1587 : out of range
Considerable: avg_biascorr=-0.4927, expected range: -0.4634 -0.4144
METOP-A IASI RADIANCES CHANNEL 1513 : out of range
Considerable: stdev_fgdepar=0.4435, expected range: 0.3482 0.4032
METOP-B IASI RADIANCES CHANNEL 312 : out of range
Considerable: avg_biascorr=-0.2245, expected range: -0.2036 -0.1722
METOP-B IASI RADIANCES CHANNEL 1578 : out of range
Considerable: avg_biascorr=-0.4383, expected range: -0.4112 -0.3695
METOP-B IASI RADIANCES CHANNEL 1579 : out of range
Considerable: avg_biascorr=-0.3418, expected range: -0.3100 -0.2560
METOP-B IASI RADIANCES CHANNEL 1587 : out of range
Considerable: avg_biascorr=-0.4709, expected range: -0.4426 -0.3887
METOP-C IASI RADIANCES CHANNEL 1587 : out of range
Considerable: avg_fgdepar=-0.1374, expected range: -0.0663 0.0565
METOP-C IASI RADIANCES CHANNEL 1579 : out of range
Considerable: avg_biascorr=-0.3808, expected range: -0.3557 -0.3127
METOP-C IASI RADIANCES (60 channels affected) : out of range
Considerable: obs_number=2485.0000, expected range: 1956.0912 2372.2838
METOP-A IASI RADIANCES CHANNEL 1578 : out of range
Slight: avg_fgdepar=-0.1113, expected range: -0.0652 0.0746
METOP-A IASI RADIANCES CHANNEL 1579 : out of range
Slight: avg_fgdepar=-0.1214, expected range: -0.0753 0.0630
METOP-A IASI RADIANCES CHANNEL 1587 : out of range
Slight: avg_fgdepar=-0.0827, expected range: -0.0465 0.0951
METOP-B IASI RADIANCES CHANNEL 1479 : out of range
Slight: avg_fgdepar=-0.0474, expected range: -0.0173 0.0942
METOP-B IASI RADIANCES CHANNEL 1574 : out of range
Slight: avg_fgdepar=-0.0902, expected range: -0.0464 0.1115
METOP-C IASI RADIANCES CHANNEL 1479 : out of range
Slight: avg_fgdepar=-0.0826, expected range: -0.0458 0.0541
METOP-C IASI RADIANCES CHANNEL 1509 : out of range
Slight: avg_fgdepar=-0.0454, expected range: -0.0138 0.0681
METOP-C IASI RADIANCES CHANNEL 1574 : out of range
Slight: avg_fgdepar=-0.1834, expected range: -0.1193 0.0456
METOP-C IASI RADIANCES CHANNEL 1578 : out of range
Slight: avg_fgdepar=-0.1483, expected range: -0.0847 0.0428
METOP-C IASI RADIANCES CHANNEL 1579 : out of range
Slight: avg_fgdepar=-0.1548, expected range: -0.1056 0.0457
METOP-C IASI RADIANCES CHANNEL 1585 : out of range
Slight: avg_fgdepar=-0.1482, expected range: -0.0852 0.0704
METOP-C IASI RADIANCES CHANNEL 1587 : out of range
Slight: stdev_fgdepar=0.4698, expected range: 0.3996 0.4505
airs
AQUA AIRS RADIANCES CHANNEL 672 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1357, expected range: -0.1201 -0.1185
AQUA AIRS RADIANCES CHANNEL 1088 : out of range
Slight: avg_fgdepar=-0.5490, expected range: -0.4948 -0.3281
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 10 : out of range
Considerable: obs_number=8896.0000, expected range: 9546.0238 11196.4762
DMSP-17 SSMIS RADIANCES CHANNEL 11 : out of range
Considerable: obs_number=9542.0000, expected range: 10125.7284 11930.5216
gpsro
COSMIC2-E5 GPSRO SETTING (9 impact heights affected) : out of range
Considerable: obs_number=2404.0000, expected range: 2565.3131 3124.1869
COSMIC2-E6 GPSRO SETTING (24 impact heights affected) : out of range
Considerable: obs_number=1490.0000, expected range: 2102.8346 2850.9154