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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-04-09 00:00

amsua
METOP-B AMSUA RADIANCES (10 channels affected) : out of range
Considerable: obs_number=5941.0000, expected range: 10311.1356 17341.8644
cris
NPP CRIS RADIANCES CHANNEL 86 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0725, expected range: -0.0627 -0.0593
NPP CRIS RADIANCES CHANNEL 91 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0445, expected range: 0.0534 0.0626
NPP CRIS RADIANCES CHANNEL 143 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0874, expected range: -0.0795 -0.0785
NOAA20 CRIS RADIANCES CHANNEL 85 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0082, expected range: 0.0199 0.0217
NOAA20 CRIS RADIANCES CHANNEL 143 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0955, expected range: -0.0888 -0.0846
NOAA20 CRIS RADIANCES CHANNEL 87 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0725, expected range: 0.0871 0.0875
NOAA20 CRIS RADIANCES CHANNEL 70 : out of range
Considerable: obs_number=2500.0000, expected range: 2082.7070 2392.7930
NOAA20 CRIS RADIANCES CHANNEL 71 : out of range
Considerable: obs_number=2524.0000, expected range: 2103.8622 2409.8878
NOAA20 CRIS RADIANCES CHANNEL 73 : out of range
Considerable: obs_number=2495.0000, expected range: 2099.1369 2365.4881
NOAA20 CRIS RADIANCES CHANNEL 113 : out of range
Considerable: obs_number=2526.0000, expected range: 2098.0158 2418.4842
ssmis
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
Considerable: obs_number=3533.0000, expected range: 4339.1059 5643.7691
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
Considerable: obs_number=3553.0000, expected range: 4341.2646 5628.9854
DMSP-17 SSMIS RADIANCES CHANNEL 10 : out of range
Slight: avg_norm_fgdepar=-0.0674, expected range: -0.0490 0.0094
gpsro
All COSMIC2-E6 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 1257.00 2571.00
COSMIC2-E2 GPSRO SETTING HEIGHT 6-8 KM : out of range
Slight: stdev_norm_fgdepar=1.1365, expected range: 0.8627 1.0691
COSMIC2-E2 GPSRO SETTING HEIGHT 8-10 KM : out of range
Slight: stdev_norm_fgdepar=1.2133, expected range: 0.8486 1.1401
mwri
FY-3D MWRI RADIANCES CHANNEL 8 : out of range
Severe: stdev_norm_fgdepar=0.2777, expected range: 0.1658 0.2224