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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-11-25 06:00

iasi
METOP-B IASI RADIANCES CHANNEL 290 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0760, expected range: 0.0910 0.1036
METOP-B IASI RADIANCES CHANNEL 292 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0360, expected range: -0.0207 -0.0023
METOP-C IASI RADIANCES CHANNEL 290 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0510, expected range: 0.0681 0.0804
METOP-C IASI RADIANCES CHANNEL 292 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0686, expected range: -0.0537 -0.0426
METOP-C IASI RADIANCES CHANNEL 571 : out of range
Severe: stdev_fgdepar=0.4893, expected range: 0.2402 0.3796
METOP-C IASI RADIANCES CHANNEL 573 : out of range
Severe: stdev_fgdepar=0.4880, expected range: 0.2420 0.3707
METOP-B IASI RADIANCES (30 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0470, expected range: -0.1184 -0.0764
METOP-C IASI RADIANCES (29 channels affected) : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.1203, expected range: -0.1867 -0.1480
cris
NOAA20 CRIS RADIANCES CHANNEL 661 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0558, expected range: -0.2946 -0.1934
NOAA20 CRIS RADIANCES CHANNEL 657 : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1047, expected range: 0.0584 0.0820
airs
AQUA AIRS RADIANCES CHANNEL 1471 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.3998, expected range: -1.1404 -0.9324
atms
NPP ATMS RADIANCES CHANNEL 13 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3646, expected range: -0.2954 -0.2095
Severely_persistent: avg_biascorr=0.0448, expected range: -0.3421 -0.2363
NPP ATMS RADIANCES CHANNEL 14 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1826, expected range: -0.0922 0.0009
Severely_persistent: avg_biascorr=0.0764, expected range: -0.2460 -0.0619
NPP ATMS RADIANCES CHANNEL 12 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0397, expected range: -0.3463 -0.2732
NPP ATMS RADIANCES CHANNEL 15 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.8369, expected range: 0.6114 0.7345
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5368, expected range: -0.4549 -0.3755
Severely_persistent: avg_biascorr=-0.7418, expected range: -0.4598 -0.4245
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
62 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3656, expected range: -0.3045 -0.2676
Severely_persistent: avg_biascorr=-0.5540, expected range: -0.3951 -0.3472
Severely_persistent: stdev_fgdepar=0.4743, expected range: 0.3240 0.4014
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6780, expected range: -0.5589 -0.4179
NOAA20 ATMS RADIANCES CHANNEL 15 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.8222, expected range: 0.5395 0.6617
NPP ATMS RADIANCES (5 channels affected) : out of range
3 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.5538, expected range: -0.2918 -0.2343
NOAA20 ATMS RADIANCES (5 channels affected) : out of range
Considerable: avg_biascorr=-0.5231, expected range: -0.6805 -0.5826
Atmospheric Motion Vector
HIMAWARI-8 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=223.0000, expected range: 964.4951 2112.6743