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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-05-16 00:00

iasi
METOP-A IASI RADIANCES CHANNEL 236 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0450, expected range: -0.0045 0.0039
METOP-A IASI RADIANCES CHANNEL 249 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2009, expected range: -0.1708 -0.1601
METOP-B IASI RADIANCES CHANNEL 254 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0909, expected range: -0.0806 -0.0707
METOP-B IASI RADIANCES CHANNEL 236 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0145, expected range: 0.0469 0.0508
METOP-B IASI RADIANCES CHANNEL 249 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1482, expected range: -0.1174 -0.1078
METOP-B IASI RADIANCES CHANNEL 286 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6378, expected range: -0.5799 -0.5677
METOP-C IASI RADIANCES CHANNEL 236 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0381, expected range: -0.0013 0.0018
METOP-C IASI RADIANCES CHANNEL 249 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2076, expected range: -0.1894 -0.1725
airs
AQUA AIRS RADIANCES CHANNEL 173 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3011, expected range: -0.2726 -0.2490
AQUA AIRS RADIANCES CHANNEL 190 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2271, expected range: -0.2046 -0.1895
AQUA AIRS RADIANCES CHANNEL 218 : out of range
32 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4952, expected range: -0.4458 -0.4384
AQUA AIRS RADIANCES CHANNEL 201 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4494, expected range: -0.4063 -0.3836
AQUA AIRS RADIANCES CHANNEL 232 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.8015, expected range: -0.7164 -0.6965
AQUA AIRS RADIANCES CHANNEL 1869 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2732, expected range: 0.1015 0.1924
AQUA AIRS RADIANCES CHANNEL 256 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6322, expected range: -0.5873 -0.5395
AQUA AIRS RADIANCES CHANNEL 1740 : out of range
28 times in the last 10 days for at least one item
Severely_persistent: obs_number=646.0000, expected range: 911.0244 971.7225
AQUA AIRS RADIANCES (15 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.3169, expected range: -0.2885 -0.2650