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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-04-12 18:00

iasi
METOP-B IASI RADIANCES CHANNEL 236 : out of range
Considerable: avg_biascorr=0.0373, expected range: 0.0469 0.0616
METOP-C IASI RADIANCES CHANNEL 236 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0123, expected range: -0.0013 0.0149
cris
NPP CRIS RADIANCES CHANNEL 85 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0687, expected range: -0.0622 -0.0565
NPP CRIS RADIANCES CHANNEL 87 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0115, expected range: 0.0166 0.0223
NPP CRIS RADIANCES CHANNEL 110 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0116, expected range: 0.0227 0.0268
NOAA20 CRIS RADIANCES CHANNEL 82 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0154, expected range: 0.0245 0.0335
NOAA20 CRIS RADIANCES CHANNEL 83 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0078, expected range: 0.0055 0.0125
NOAA20 CRIS RADIANCES CHANNEL 143 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0819, expected range: -0.0750 -0.0694
NOAA20 CRIS RADIANCES CHANNEL 123 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0366, expected range: -0.0247 -0.0129
NOAA20 CRIS RADIANCES CHANNEL 124 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0570, expected range: -0.0418 -0.0343
NOAA20 CRIS RADIANCES CHANNEL 125 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1050, expected range: -0.0909 -0.0833
NOAA20 CRIS RADIANCES CHANNEL 138 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1151, expected range: -0.1042 -0.0973
NOAA20 CRIS RADIANCES CHANNEL 110 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0700, expected range: 0.0782 0.0867
Geostationary CSR
All GOES-16 ABI ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 36693.23 50818.72
amdar
TAMDAR WIND VECTOR DIFF (M/S) (3 pressure layers affected) : missing
Severe: obs_number=0.0000, expected range: 14.6940 196.6176
Severe: obs_number=0.0000, expected range: 15.9473 193.0987