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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Ensemble Data Assimilation at 2021-06-18 00:00

iasi
METOP-A IASI RADIANCES CHANNEL 106 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1477, expected range: -0.0905 -0.0883
METOP-A IASI RADIANCES CHANNEL 151 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0245, expected range: 0.0689 0.1018
METOP-B IASI RADIANCES CHANNEL 1509 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1100, expected range: -0.1372 -0.1219
METOP-B IASI RADIANCES CHANNEL 113 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0272, expected range: 0.0609 0.0964
METOP-B IASI RADIANCES CHANNEL 151 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0742, expected range: 0.1152 0.1445
METOP-B IASI RADIANCES CHANNEL 170 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0187, expected range: 0.0499 0.0632
METOP-C IASI RADIANCES CHANNEL 151 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0067, expected range: 0.0308 0.0714
METOP-C IASI RADIANCES CHANNEL 176 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1158, expected range: -0.0785 -0.0698
METOP-B IASI RADIANCES CHANNEL 176 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0590, expected range: -0.0296 -0.0180
METOP-B IASI RADIANCES CHANNEL 207 : out of range
Considerable: obs_number=2295.0000, expected range: 1901.0806 2214.2944
mhs
NOAA-19 MHS ALLSKY RADIANCES CHANNEL 4 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=14578.0000, expected range: 15508.1861 17147.4389
METOP-B MHS ALLSKY RADIANCES CHANNEL 3 : out of range
Considerable: obs_number=4820.0000, expected range: 3619.4185 4569.0815
METOP-B MHS ALLSKY RADIANCES CHANNEL 4 : out of range
Considerable: obs_number=4773.0000, expected range: 3591.3275 4477.2975