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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-12-06 18:00

amsua
METOP-B AMSUA ALL SKY RADIANCES (9 channels affected) : out of range
Considerable: obs_number=620.0000, expected range: 5805.1422 9947.1356
AMSUA Pacific RARS
All NOAA-18 AMSUA ALL SKY CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 6673.08
All NOAA-19 AMSUA ALL SKY CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 3672.60
iasi
METOP-B IASI RADIANCES (220 channels affected) : out of range
Severe: obs_number=1411.0000, expected range: 11422.1469 11575.7975
METOP-B IASI RADIANCES CHANNEL 49 : out of range
Considerable: avg_fgdepar=-0.0584, expected range: -0.0265 0.0273
METOP-B IASI RADIANCES CHANNEL 141 : out of range
Considerable: avg_fgdepar=-0.0594, expected range: -0.0288 0.0292
METOP-B IASI RADIANCES CHANNEL 212 : out of range
Considerable: avg_fgdepar=0.0589, expected range: -0.0171 0.0304
METOP-B IASI RADIANCES CHANNEL 230 : out of range
Slight: stdev_fgdepar=0.2651, expected range: 0.2375 0.2576
mhs
METOP-B MHS ALLSKY RADIANCES CHANNEL 3 : out of range
Severe: obs_number=2760.0000, expected range: 20671.6688 27149.3312
METOP-B MHS ALLSKY RADIANCES CHANNEL 4 : out of range
Severe: obs_number=2474.0000, expected range: 19602.7403 25193.5374
METOP-B MHS ALLSKY RADIANCES CHANNEL 5 : out of range
Severe: obs_number=1638.0000, expected range: 11745.1633 15818.9478
atms
NPP ATMS RADIANCES CHANNEL 13 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3848, expected range: 0.2751 0.3282
NPP ATMS RADIANCES CHANNEL 14 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.6330, expected range: 0.3912 0.4766
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3422, expected range: 0.2410 0.2902
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5480, expected range: 0.3346 0.4338
NOAA20 ATMS RADIANCES CHANNEL 10 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5574, expected range: -0.7014 -0.6211
Atmospheric Motion Vector
All HIMAWARI-8 AMV CLOUDY WV3 ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 164.67 534.83
All NOAA-18 AVHRR IR ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 40.64 781.82
All METOP-B AMV IR ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 451.56 1295.44
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 139533.49
METOP-B ASCAT WIND VECTOR DIFF (M/S) : out of range
Severe: obs_number=1018.0000, expected range: 13963.9043 20358.8735
resat
All METOP-B GOME-2 ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 7920.90 46368.05