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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

iasi
METOP-B IASI RADIANCES CHANNEL 236 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0340, expected range: 0.0469 0.0640
METOP-C IASI RADIANCES CHANNEL 236 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0120, expected range: -0.0013 0.0100
cris
NPP CRIS RADIANCES CHANNEL 85 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0693, expected range: -0.0622 -0.0585
NPP CRIS RADIANCES CHANNEL 87 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0086, expected range: 0.0166 0.0191
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
28 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0627, expected range: 0.0696 0.0711
NOAA20 CRIS RADIANCES CHANNEL 123 : out of range
26 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0349, expected range: -0.0247 -0.0158
NOAA20 CRIS RADIANCES CHANNEL 124 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0543, expected range: -0.0418 -0.0380
NOAA20 CRIS RADIANCES CHANNEL 125 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1038, expected range: -0.0909 -0.0851
NOAA20 CRIS RADIANCES CHANNEL 138 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1170, expected range: -0.1042 -0.0982
NOAA20 CRIS RADIANCES CHANNEL 110 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0701, expected range: 0.0782 0.0823
airs
AQUA AIRS RADIANCES CHANNEL 1865 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=563.0000, expected range: 1298.9277 1308.1605
AQUA AIRS RADIANCES CHANNEL 1866 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=563.0000, expected range: 1298.5695 1305.2762
AQUA AIRS RADIANCES CHANNEL 1868 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=572.0000, expected range: 1299.6856 1317.2993
AQUA AIRS RADIANCES CHANNEL 1873 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=574.0000, expected range: 1302.5418 1327.3569
AQUA AIRS RADIANCES CHANNEL 1876 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=565.0000, expected range: 1299.1123 1305.7832
AQUA AIRS RADIANCES CHANNEL 1877 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=574.0000, expected range: 1302.5267 1328.6546
AQUA AIRS RADIANCES CHANNEL 1424 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=498.0000, expected range: 1705.8477 1705.8477
AQUA AIRS RADIANCES CHANNEL 1471 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=521.0000, expected range: 1808.6474 1808.6474
AQUA AIRS RADIANCES CHANNEL 1520 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=566.0000, expected range: 1909.7554 1909.7554
AQUA AIRS RADIANCES (12 channels affected) : out of range
Considerable: obs_number=504.0000, expected range: 886.9046 1239.3190
mwhs2
All FY-3C MWHS2 ALLSKY ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 0.00 29892.68
amdar
All TAMDAR ALL LAYERS North East Pacific : all data missing
Severe: obs_number=0, expected range: 0.00 327.41
All TAMDAR ALL LAYERS East pacific Tropica : all data missing
Severe: obs_number=0, expected range: 3.54 323.41