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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-02-27 12:00

amsua
AQUA AMSUA RADIANCES CHANNEL 12 : out of range
Considerable: avg_biascorr=0.0617, expected range: -0.2453 -0.0479
iasi
All METOP-C IASI ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 8482.87 12305.13
cris
NPP CRIS RADIANCES (41 channels affected) : out of range
Considerable: avg_biascorr=0.3140, expected range: 0.0972 0.2338
NOAA20 CRIS RADIANCES CHANNEL 72 : out of range
Considerable: avg_fgdepar=0.0230, expected range: -0.0094 0.0119
airs
AQUA AIRS RADIANCES CHANNEL 1003 : missing
19 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 918.5937 4097.6946
AQUA AIRS RADIANCES (29 channels affected) : out of range
Considerable: avg_biascorr=0.1340, expected range: -0.3746 -0.0407
mhs
METOP-A MHS ALLSKY RADIANCES CHANNEL 3 : out of range
1 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.3230, expected range: 0.3997 0.4764
METOP-A MHS ALLSKY RADIANCES CHANNEL 5 : out of range
1 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.3198, expected range: 0.4217 0.5150
METOP-A MHS ALLSKY RADIANCES CHANNEL 4 : out of range
1 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.3334, expected range: 0.4029 0.5714
Atmospheric Motion Vector
METEOSAT-11 AMV VIS2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (H : out of range
Severe: stdev_press=23.1410, expected range: 26.4230 29.4309
Geostationary CSR
All GOES-15 IMAGER ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 8026.41 16336.34
Radiosondes
All LAND TEMP ALL LAYERS South pole : all data missing
Severe: obs_number=0, expected range: 60.17 118.23
HIGH RESO LAND TEMP Q (G/KG) (2 pressure layers affected) : out of range
Severe: obs_number=131.0000, expected range: 60.9583 70.4702
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
Severe: obs_number=570.0000, expected range: 654.2842 670.7158
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected : out of range
Severe: obs_number=546.0000, expected range: 632.5027 642.8306
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA : missing
1 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 254.9682
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 26 : all data missing
Severe: obs_number=0, expected range: 57.38 154.12