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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-09 00:00

iasi
All METOP-A/IASI RADIANCES ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 9019.39 12018.97
METOP-B/IASI RADIANCES CHANNEL 178 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0725, expected range: 0.0285 0.0511
METOP-C/IASI RADIANCES CHANNEL 1585 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4385, expected range: 0.2213 0.3657
cris
NPP/CRIS RADIANCES CHANNEL 622 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.3531, expected range: -0.0593 0.0908
NPP/CRIS RADIANCES (218 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1548, expected range: 0.2275 0.2790
NPP/CRIS RADIANCES CHANNEL 626 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_fgdepar=0.0866, expected range: -0.0484 0.0567
Atmospheric Motion Vector
All METEOSAT-8/AMV CLOUDY WV1 WIND VECTOR DIFF (M/S) ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 476.02 2955.83
All METEOSAT-11/AMV CLOUDY WV1 WIND VECTOR DIFF (M/S) ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 27.95 2649.05
HIMAWARI-8 AMV VIS1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HP : out of range
Considerable: stdev_fgdepar=1.1235, expected range: 0.7625 1.0049
HIMAWARI-8 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
1 times in the last 10 days for at least one item
Slight: stdev_fgdepar=2.0328, expected range: 1.5593 1.9475
Geostationary CSR
METEOSAT-8/SEVIRI RADIANCES CHANNEL 2 : out of range
1 times in the last 10 days for at least one item
Slight: obs_number=12388.0000, expected range: 13650.9194 24847.8263
Radiosondes
LAND TEMP TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=609.0000, expected range: 187.4545 501.1011
synop
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
13 times in the last 10 days for at least one item
Severely_persistent: rms_fgdepar=144.0080, expected range: 23.6353 60.5411
Severely_persistent: obs_number=63.0000, expected range: 65.0000 65.0000
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: obs_number=827.0000, expected range: 980.5486 1146.3338
Severely_persistent: obs_number=309.0000, expected range: 506.5792 619.0090
Severely_persistent: obs_number=163.0000, expected range: 249.9784 316.5216
Severely_persistent: obs_number=170.0000, expected range: 254.4968 359.0620
Severely_persistent: rms_fgdepar=73.6480, expected range: 12.8264 47.4760