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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-08-16 12:00

amsua
NOAA-15 AMSUA ALL SKY RADIANCES CHANNEL 12 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1350, expected range: -0.1021 -0.0905
NOAA-15 AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0553, expected range: 0.0932 0.1001
NOAA-15 AMSUA ALL SKY RADIANCES CHANNEL 9 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3036, expected range: -0.2530 -0.2343
NOAA-19 AMSUA ALL SKY RADIANCES CHANNEL 8 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1706, expected range: -0.4871 -0.2416
iasi
METOP-B IASI RADIANCES CHANNEL 278 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0109, expected range: -0.0435 -0.0305
METOP-C IASI RADIANCES CHANNEL 314 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1349, expected range: -0.1700 -0.1549
METOP-C IASI RADIANCES CHANNEL 325 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1153, expected range: -0.1385 -0.1274
METOP-C IASI RADIANCES CHANNEL 5379 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1519, expected range: -0.1193 -0.1151
METOP-B IASI RADIANCES (176 channels affected) : out of range
Severe: obs_number=15922.0000, expected range: 22765.2780 23114.8397
METOP-B IASI RADIANCES CHANNEL 85 : out of range
Severe: avg_biascorr=0.3524, expected range: 0.3895 0.4240
METOP-B IASI RADIANCES CHANNEL 87 : out of range
Severe: avg_biascorr=0.1587, expected range: 0.2002 0.2403
METOP-B IASI RADIANCES CHANNEL 163 : out of range
Severe: avg_biascorr=0.2532, expected range: 0.2772 0.2993
METOP-B IASI RADIANCES CHANNEL 170 : out of range
Severe: avg_biascorr=0.2002, expected range: 0.2209 0.2460
METOP-B IASI RADIANCES CHANNEL 191 : out of range
Severe: avg_biascorr=0.0066, expected range: 0.0336 0.0634
METOP-B IASI RADIANCES CHANNEL 197 : out of range
Severe: avg_biascorr=0.0248, expected range: 0.0472 0.0690
METOP-B IASI RADIANCES CHANNEL 203 : out of range
Severe: avg_biascorr=0.1078, expected range: 0.1275 0.1484
METOP-B IASI RADIANCES CHANNEL 210 : out of range
Severe: avg_biascorr=-0.0545, expected range: -0.0399 -0.0222
METOP-B IASI RADIANCES CHANNEL 234 : out of range
Severe: avg_biascorr=0.0283, expected range: 0.0418 0.0589
METOP-C IASI RADIANCES (162 channels affected) : out of range
Severe: obs_number=15971.0000, expected range: 22808.5339 23097.1131
METOP-C IASI RADIANCES CHANNEL 106 : out of range
Slight: stdev_fgdepar=0.3261, expected range: 0.2946 0.3154
METOP-C IASI RADIANCES CHANNEL 119 : out of range
Slight: stdev_fgdepar=0.3126, expected range: 0.2840 0.3051
METOP-C IASI RADIANCES CHANNEL 138 : out of range
Slight: stdev_fgdepar=0.3027, expected range: 0.2690 0.2957
METOP-C IASI RADIANCES CHANNEL 301 : out of range
Slight: stdev_fgdepar=0.2973, expected range: 0.2615 0.2900
cris
All NPP CRIS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 22117.38 22655.69
mwhs2
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 14 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=2.8835, expected range: 3.9904 5.1835
atms
All NPP ATMS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 11826.17 14095.83
Atmospheric Motion Vector
All AQUA MODIS CLEAR WV ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 26.81 1202.93
All NPP VIIRS AMV IR ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 186.35 1403.85