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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 06:00

amsua
METOP-C AMSUA RADIANCES (10 channels affected) : out of range
Considerable: obs_number=1232.0000, expected range: 1877.1744 3321.1113
iasi
METOP-C IASI RADIANCES CHANNEL 236 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0141, expected range: -0.0013 0.0097
cris
NPP CRIS RADIANCES CHANNEL 85 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0722, expected range: -0.0622 -0.0583
NPP CRIS RADIANCES CHANNEL 87 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0074, expected range: 0.0166 0.0193
NPP CRIS RADIANCES CHANNEL 124 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0719, expected range: -0.0630 -0.0521
NOAA20 CRIS RADIANCES CHANNEL 83 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0003, expected range: 0.0055 0.0092
NOAA20 CRIS RADIANCES CHANNEL 143 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0797, expected range: -0.0750 -0.0692
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0558, expected range: 0.0696 0.0705
NOAA20 CRIS RADIANCES CHANNEL 123 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0344, expected range: -0.0247 -0.0157
NOAA20 CRIS RADIANCES CHANNEL 124 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0550, expected range: -0.0418 -0.0379
NOAA20 CRIS RADIANCES CHANNEL 125 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1026, expected range: -0.0909 -0.0848
NOAA20 CRIS RADIANCES CHANNEL 138 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1173, expected range: -0.1042 -0.0992
NOAA20 CRIS RADIANCES CHANNEL 110 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0682, expected range: 0.0782 0.0824
airs
AQUA AIRS RADIANCES CHANNEL 1865 : out of range
Severe: obs_number=585.0000, expected range: 1298.9277 1469.7092
AQUA AIRS RADIANCES CHANNEL 1866 : out of range
Severe: obs_number=585.0000, expected range: 1298.5695 1465.5841
AQUA AIRS RADIANCES CHANNEL 1868 : out of range
Severe: obs_number=587.0000, expected range: 1299.6856 1481.7210
AQUA AIRS RADIANCES CHANNEL 1873 : out of range
Severe: obs_number=590.0000, expected range: 1302.5418 1493.6882
AQUA AIRS RADIANCES CHANNEL 1876 : out of range
Severe: obs_number=585.0000, expected range: 1299.1123 1466.3225
AQUA AIRS RADIANCES CHANNEL 1877 : out of range
Severe: obs_number=590.0000, expected range: 1302.5267 1494.1675
AQUA AIRS RADIANCES CHANNEL 232 : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=537.0000, expected range: 1779.9925 1779.9925
AQUA AIRS RADIANCES CHANNEL 1424 : out of range
Considerable: obs_number=564.0000, expected range: 1705.8477 1705.8477
AQUA AIRS RADIANCES CHANNEL 1471 : out of range
Considerable: obs_number=589.0000, expected range: 1808.6474 1808.6474
AQUA AIRS RADIANCES CHANNEL 1520 : out of range
Considerable: obs_number=640.0000, expected range: 1909.7554 1909.7554
gpsro
METOP-B GRAS RISING HEIGHT 46-48 KM : out of range
Slight: avg_norm_fgdepar=0.1460, expected range: -0.1128 0.0931
amdar
WIGOS AMDAR WIND VECTOR DIFF (M/S) (3 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=1112.0000, expected range: 82.6426 352.6104