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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-07-28 00:00

amsua
NOAA-18 AMSUA RADIANCES CHANNEL 14 : out of range
Severe: avg_biascorr=-0.7375, expected range: -0.6741 -0.6008
METOP-C AMSUA RADIANCES CHANNEL 14 : out of range
Considerable: avg_biascorr=-0.6019, expected range: -0.5468 -0.4550
NOAA-18 AMSUA RADIANCES CHANNEL 12 : out of range
Slight: avg_fgdepar=-0.0809, expected range: -0.0606 -0.0175
iasi
METOP-C IASI RADIANCES (164 channels affected) : out of range
Severe: avg_fgdepar=0.2508, expected range: -0.1223 0.0272
METOP-C IASI RADIANCES (82 channels affected) : out of range
Severe: avg_biascorr=0.3071, expected range: 0.1269 0.1719
METOP-A IASI RADIANCES CHANNEL 138 : out of range
Considerable: avg_biascorr=-0.4679, expected range: -0.4216 -0.3396
METOP-A IASI RADIANCES CHANNEL 3165 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=1.9010, expected range: 0.6993 1.3988
METOP-A IASI RADIANCES CHANNEL 3411 : out of range
Considerable: stdev_fgdepar=1.9198, expected range: 0.7215 1.4712
METOP-B IASI RADIANCES CHANNEL 151 : out of range
Considerable: avg_biascorr=0.0813, expected range: 0.0970 0.1259
METOP-B IASI RADIANCES CHANNEL 106 : out of range
Considerable: avg_biascorr=-0.7271, expected range: -0.6589 -0.5506
METOP-B IASI RADIANCES CHANNEL 113 : out of range
Considerable: avg_biascorr=-0.4397, expected range: -0.3762 -0.2846
METOP-B IASI RADIANCES CHANNEL 119 : out of range
Considerable: avg_biascorr=-0.5464, expected range: -0.4980 -0.4048
METOP-C IASI RADIANCES (78 channels affected) : out of range
Considerable: obs_number=1836.0000, expected range: 1992.9818 2350.3932
ssmis
DMSP-17 SSMIS RADIANCES (9 channels affected) : out of range
Considerable: obs_number=14540.0000, expected range: 15748.1241 18762.3759
gpsro
All TERRASAR-X GPSRO SETTING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 170.28 1017.99
Geostationary CSR
METEOSAT-8 SEVIRI RADIANCES CHANNEL 2 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0750, expected range: -0.0019 0.1313