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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-10-06 00:00

amsua
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 10 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0526, expected range: 0.0670 0.0842
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 11 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1415, expected range: 0.1599 0.1791
NOAA-15 AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.1333, expected range: 0.0469 0.1027
iasi
METOP-B IASI RADIANCES CHANNEL 3098 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.9018, expected range: 0.4092 0.7120
METOP-B IASI RADIANCES CHANNEL 3248 : out of range
Considerable: stdev_fgdepar=0.6889, expected range: 0.4371 0.5975
METOP-B IASI RADIANCES CHANNEL 3446 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=1.3265, expected range: 0.6576 1.0729
METOP-B IASI RADIANCES CHANNEL 3448 : out of range
Considerable: stdev_fgdepar=0.9035, expected range: 0.6150 0.7876
METOP-B IASI RADIANCES CHANNEL 3452 : out of range
Considerable: stdev_fgdepar=1.3688, expected range: 0.6032 1.1113
METOP-B IASI RADIANCES CHANNEL 3575 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=1.2447, expected range: 0.7488 1.0414
METOP-B IASI RADIANCES CHANNEL 3653 : out of range
Considerable: stdev_fgdepar=1.2077, expected range: 0.8208 1.0651
atms
NOAA20 ATMS RADIANCES CHANNEL 9 : out of range
Considerable: stdev_fgdepar=0.1471, expected range: 0.0832 0.1245
NOAA20 ATMS RADIANCES CHANNEL 10 : out of range
Considerable: stdev_fgdepar=0.1485, expected range: 0.1062 0.1314
ssmis
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
Considerable: obs_number=19447.0000, expected range: 21753.7165 23627.2835
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
Considerable: obs_number=19459.0000, expected range: 21770.1576 23666.5924
DMSP-18 SSMIS RADIANCES CHANNEL 9 : out of range
Slight: obs_number=14482.0000, expected range: 16389.4701 18517.4049
gpsro
COSMIC2-E1 GPSRO RISING HEIGHT 44-46 KM : out of range
Slight: avg_norm_fgdepar=0.1634, expected range: -0.1511 0.0870
COSMIC2-E5 GPSRO SETTING (19 impact heights affected) : out of range
Slight: obs_number=1064.0000, expected range: 1765.4329 4195.1921
SENTINEL 6A GPSRO SETTING (7 impact heights affected) : out of range
Slight: obs_number=1691.0000, expected range: 2250.7810 3458.9690
SENTINEL 6A GPSRO RISING HEIGHT 20-22 KM : out of range
Slight: obs_number=1070.0000, expected range: 1332.8575 2215.1425
SENTINEL 6A GPSRO RISING HEIGHT 22-24 KM : out of range
Slight: obs_number=938.0000, expected range: 1172.2501 1956.5735
SENTINEL 6A GPSRO RISING HEIGHT 24-26 KM : out of range
1 times in the last 10 days for at least one item
Slight: obs_number=845.0000, expected range: 1036.9165 1743.3335
Atmospheric Motion Vector
NOAA-19 AVHRR IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: stdev_fgdepar=2.0177, expected range: 1.5329 1.7898