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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-05-28 00:00

amsua
NOAA-19 AMSUA RADIANCES (6 channels affected) : out of range
Considerable: obs_number=2687.0000, expected range: 3094.5194 3319.6018
cris
NPP CRIS RADIANCES CHANNEL 108 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1450, expected range: 0.1586 0.1707
NPP CRIS RADIANCES CHANNEL 109 : out of range
23 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1167, expected range: 0.1274 0.1327
NOAA20 CRIS RADIANCES CHANNEL 26 : out of range
Considerable: stdev_fgdepar=0.1628, expected range: 0.1387 0.1546
airs
AQUA AIRS RADIANCES CHANNEL 20 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0111, expected range: 0.1321 0.2940
AQUA AIRS RADIANCES CHANNEL 27 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.1596, expected range: -0.0432 0.1316
AQUA AIRS RADIANCES CHANNEL 52 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0997, expected range: 0.0024 0.1600
AQUA AIRS RADIANCES CHANNEL 110 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0628, expected range: 0.0098 0.1465
gpsro
All FY-3C GNOS RISING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1018.29
Atmospheric Motion Vector
HIMAWARI-8 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-60 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=1398.0000, expected range: 807.5345 1246.2155
GOES-17 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HPA) : out of range
1 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.8783, expected range: 0.5134 0.7946
Radiosondes
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=83.0000, expected range: 108.9543 154.5457
prof
All EUROPEAN WIND PROFILER ALL LAYERS South West Pacific : all data missing
Severely_persistent: obs_number=0, expected range: 140.98 395.31
All EUROPEAN WIND PROFILER ALL LAYERS West pacific Tropica : all data missing
Severely_persistent: obs_number=0, expected range: 140.98 395.31