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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-01-21 12:00

amsua
NOAA 15 AMSUA ALL SKY RADIANCES CHANNEL 10 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0880, expected range: -0.1130 -0.1068
NOAA 19 AMSUA ALL SKY RADIANCES CHANNEL 9 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1011, expected range: -0.1560 -0.1363
iasi
METOP-B IASI RADIANCES CHANNEL 3168 : out of range
2 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.6757, expected range: 0.4531 0.6711
METOP-B IASI RADIANCES CHANNEL 3248 : out of range
3 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.6745, expected range: 0.4340 0.6225
METOP-C IASI RADIANCES CHANNEL 3168 : out of range
5 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.6562, expected range: 0.4492 0.6523
METOP-C IASI RADIANCES CHANNEL 3248 : out of range
5 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.6534, expected range: 0.4249 0.6130
mhs
METOP-B MHS ALLSKY RADIANCES CHANNEL 5 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: obs_number=5474.0000, expected range: 6595.8093 6727.4353
atms
NOAA20 ATMS RADIANCES CHANNEL 10 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3546, expected range: -0.4179 -0.3931
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 5 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0657, expected range: 0.1918 0.2595
Atmospheric Motion Vector
METEOSAT-8 AMV CLOUDY WV1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_press=35.1469, expected range: 24.6444 27.6067
METEOSAT-8 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_press=288.4444, expected range: 252.0376 261.5186
Severely_persistent: stdev_press=10.9078, expected range: 21.6612 28.9211
All METEOSAT-11 AMV IR3 ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 1572.83 2256.67
GOES-16 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Slight: stdev_press=33.6417, expected range: 28.2533 31.7760