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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-07-29 12:00

amsua
METOP-A AMSUA RADIANCES CHANNEL 14 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.2988, expected range: 0.3364 0.4003
METOP-C AMSUA RADIANCES CHANNEL 11 : out of range
1 times in the last 10 days for at least one item
Slight: avg_fgdepar=0.0597, expected range: -0.0376 0.0369
iasi
METOP-C IASI RADIANCES (71 channels affected) : out of range
Severe: stdev_fgdepar=0.3988, expected range: 0.2981 0.3498
METOP-C IASI RADIANCES CHANNEL 49 : out of range
Considerable: avg_fgdepar=-0.0946, expected range: -0.0468 0.0444
METOP-C IASI RADIANCES (32 channels affected) : out of range
Slight: stdev_fgdepar=0.4483, expected range: 0.3769 0.4339
METOP-C IASI RADIANCES CHANNEL 55 : out of range
Slight: avg_fgdepar=-0.0869, expected range: -0.0508 0.0467
METOP-C IASI RADIANCES CHANNEL 148 : out of range
Slight: avg_fgdepar=-0.0808, expected range: -0.0526 0.0545
METOP-C IASI RADIANCES CHANNEL 207 : out of range
Slight: avg_fgdepar=-0.0555, expected range: -0.0341 0.0505
METOP-C IASI RADIANCES CHANNEL 214 : out of range
Slight: avg_fgdepar=-0.0649, expected range: -0.0339 0.0480
METOP-C IASI RADIANCES CHANNEL 222 : out of range
Slight: avg_fgdepar=-0.0507, expected range: -0.0272 0.0421
cris
NOAA20 CRIS RADIANCES (27 channels affected) : out of range
Considerable: avg_fgdepar=-0.0384, expected range: -0.0055 0.0474
NOAA20 CRIS RADIANCES CHANNEL 114 : out of range
Considerable: stdev_fgdepar=0.0825, expected range: 0.0454 0.0692