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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-09-07 12:00

amsua
METOP-A AMSUA RADIANCES CHANNEL 9 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0317, expected range: 0.0898 0.1284
METOP-A AMSUA RADIANCES CHANNEL 10 : out of range
3 times in the last 10 days for at least one item
Severe: avg_biascorr=0.2566, expected range: 0.3060 0.3718
METOP-A AMSUA RADIANCES CHANNEL 11 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=0.2001, expected range: 0.2609 0.3365
METOP-A AMSUA RADIANCES CHANNEL 14 : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0083, expected range: 0.0527 0.1077
METOP-A AMSUA RADIANCES (8 channels affected) : out of range
Considerable: obs_number=2795.0000, expected range: 3422.0385 5398.4321
iasi
METOP-A IASI RADIANCES (220 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=5054.0000, expected range: 21011.8636 23565.0776
gpsro
All COSMIC2-E1 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 1116.67 2955.08
Atmospheric Motion Vector
METEOSAT-8 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
Severe: obs_number=515.0000, expected range: 104.1810 211.3190
GOES-16 AMV CLOUDY WV3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HP : out of range
Slight: stdev_press=29.9792, expected range: 26.6026 28.3412
amdar
All TAMDAR TEMPERATURE (K) ALL LAYERS North East Pacific : all data missing
Severe: obs_number=0, expected range: 0.00 252.48
All TAMDAR TEMPERATURE (K) ALL LAYERS East pacific Tropica : all data missing
Severe: obs_number=0, expected range: 0.00 258.97