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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-07-26 00:00

amsua
METOP-B AMSUA RADIANCES CHANNEL 12 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4528, expected range: 0.3200 0.3941
METOP-B AMSUA RADIANCES CHANNEL 13 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.6795, expected range: 0.4641 0.5803
METOP-B AMSUA RADIANCES CHANNEL 14 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=1.1563, expected range: 0.8039 0.9644
METOP-C AMSUA RADIANCES CHANNEL 12 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4338, expected range: 0.3065 0.3750
METOP-C AMSUA RADIANCES CHANNEL 14 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=1.0867, expected range: 0.7692 0.9402
METOP-A AMSUA RADIANCES (8 channels affected) : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=1625.0000, expected range: 1886.1421 2835.2518
METOP-A AMSUA RADIANCES CHANNEL 12 : out of range
3 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.4580, expected range: 0.3694 0.4261
METOP-C AMSUA RADIANCES (8 channels affected) : out of range
Considerable: obs_number=5057.0000, expected range: 6431.9549 11684.2875
iasi
METOP-C IASI RADIANCES CHANNEL 74 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2350, expected range: -0.1625 -0.1127
METOP-C IASI RADIANCES CHANNEL 113 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1674, expected range: 0.1975 0.2065
METOP-C IASI RADIANCES CHANNEL 146 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0706, expected range: 0.1104 0.1461
METOP-B IASI RADIANCES CHANNEL 74 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.1374, expected range: -0.0914 -0.0524
METOP-B IASI RADIANCES CHANNEL 165 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1402, expected range: 0.1960 0.2055
METOP-B IASI RADIANCES CHANNEL 170 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1714, expected range: 0.1952 0.2095
METOP-B IASI RADIANCES CHANNEL 299 : out of range
Severe: avg_biascorr=-0.4730, expected range: -0.4222 -0.3701
METOP-A IASI RADIANCES CHANNEL 236 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=298.0000, expected range: 439.4916 992.2012
METOP-B IASI RADIANCES CHANNEL 146 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.1678, expected range: 0.1923 0.2369
METOP-B IASI RADIANCES CHANNEL 154 : out of range
Considerable: avg_biascorr=-0.0321, expected range: 0.0040 0.0620
METOP-C IASI RADIANCES CHANNEL 165 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0822, expected range: 0.1051 0.1378
METOP-C IASI RADIANCES CHANNEL 299 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.5443, expected range: -0.5004 -0.4382
airs
AQUA AIRS RADIANCES CHANNEL 1012 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1468, expected range: -0.1310 -0.1147
AQUA AIRS RADIANCES CHANNEL 52 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3482, expected range: -0.2612 -0.2159
AQUA AIRS RADIANCES CHANNEL 72 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2192, expected range: -0.1205 -0.1125
gpsro
METOP-B GRAS RISING HEIGHT 28-30 KM : out of range
Slight: stdev_norm_fgdepar=1.3205, expected range: 0.8426 1.2100