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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-04-15 00:00

amsua
METOP-C AMSUA RADIANCES (10 channels affected) : out of range
Considerable: obs_number=4617.0000, expected range: 7082.6799 11043.9262
cris
NPP CRIS RADIANCES CHANNEL 85 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0772, expected range: -0.0622 -0.0582
NPP CRIS RADIANCES CHANNEL 87 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0043, expected range: 0.0166 0.0193
NPP CRIS RADIANCES CHANNEL 111 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0309, expected range: -0.0207 -0.0088
NOAA20 CRIS RADIANCES CHANNEL 82 : out of range
28 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0143, expected range: 0.0245 0.0300
NOAA20 CRIS RADIANCES CHANNEL 83 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0090, expected range: 0.0055 0.0094
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0578, expected range: 0.0638 0.0717
NOAA20 CRIS RADIANCES CHANNEL 143 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0820, expected range: -0.0750 -0.0690
NOAA20 CRIS RADIANCES CHANNEL 144 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0942, expected range: -0.0887 -0.0816
NOAA20 CRIS RADIANCES CHANNEL 124 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0536, expected range: -0.0418 -0.0377
NOAA20 CRIS RADIANCES CHANNEL 125 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1009, expected range: -0.0909 -0.0846
NOAA20 CRIS RADIANCES CHANNEL 138 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1125, expected range: -0.1042 -0.0990
NOAA20 CRIS RADIANCES CHANNEL 110 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0704, expected range: 0.0782 0.0825
NOAA20 CRIS RADIANCES CHANNEL 141 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0256, expected range: -0.0176 -0.0099
NPP CRIS RADIANCES CHANNEL 84 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0421, expected range: -0.0339 -0.0239
NPP CRIS RADIANCES CHANNEL 86 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0536, expected range: -0.0449 -0.0341
NPP CRIS RADIANCES CHANNEL 88 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0149, expected range: -0.0096 -0.0021
airs
AQUA AIRS RADIANCES CHANNEL 139 : out of range
Severe: avg_biascorr=-0.3573, expected range: -0.3245 -0.3133
AQUA AIRS RADIANCES CHANNEL 151 : out of range
Severe: avg_biascorr=-0.4748, expected range: -0.4310 -0.4154
AQUA AIRS RADIANCES CHANNEL 98 : out of range
Severe: avg_fgdepar=-0.0728, expected range: -0.0431 -0.0181
AQUA AIRS RADIANCES CHANNEL 52 : out of range
Considerable: avg_biascorr=-0.2125, expected range: -0.1978 -0.1767
AQUA AIRS RADIANCES CHANNEL 128 : out of range
Considerable: avg_biascorr=-0.1516, expected range: -0.1370 -0.1155
AQUA AIRS RADIANCES CHANNEL 232 : out of range
2 times in the last 10 days for at least one item
Slight: avg_fgdepar=-0.0028, expected range: -0.0401 -0.0147
AQUA AIRS RADIANCES CHANNEL 587 : out of range
2 times in the last 10 days for at least one item
Slight: avg_fgdepar=0.0900, expected range: 0.0019 0.0703
AQUA AIRS RADIANCES CHANNEL 251 : out of range
Slight: stdev_fgdepar=0.3335, expected range: 0.2946 0.3254
gpsro
All COSMIC2-E5 GPSRO RISING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 178.01 1566.36
amdar
WIGOS AMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=854.0000, expected range: 82.6086 354.8016