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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-11-29 06:00

amsua
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6220, expected range: 0.5215 0.5526
iasi
METOP-B IASI RADIANCES CHANNEL 3168 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1241, expected range: -0.0538 0.0170
METOP-C IASI RADIANCES CHANNEL 292 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0760, expected range: -0.0537 -0.0471
METOP-B IASI RADIANCES (43 channels affected) : out of range
Severe: avg_biascorr=-0.0324, expected range: -0.1106 -0.0764
METOP-B IASI RADIANCES (12 channels affected) : out of range
Severe: avg_biascorr=0.0770, expected range: 0.0910 0.1044
METOP-C IASI RADIANCES (36 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0997, expected range: -0.1784 -0.1480
METOP-C IASI RADIANCES CHANNEL 360 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=851.0000, expected range: 218.2193 687.1011
METOP-C IASI RADIANCES CHANNEL 354 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=855.0000, expected range: 234.2161 696.4470
cris
NOAA20 CRIS RADIANCES CHANNEL 661 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0558, expected range: -0.2946 -0.1934
NOAA20 CRIS RADIANCES CHANNEL 409 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0374, expected range: -0.4197 -0.2016
NOAA20 CRIS RADIANCES CHANNEL 963 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0313, expected range: -0.0988 -0.0713
NOAA20 CRIS RADIANCES (24 channels affected) : out of range
Severe: avg_biascorr=-0.1278, expected range: -0.0987 -0.0790
atms
NPP ATMS RADIANCES CHANNEL 15 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.8043, expected range: 0.6942 0.7345
NPP ATMS RADIANCES CHANNEL 12 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0822, expected range: -0.3264 -0.2732
NPP ATMS RADIANCES CHANNEL 14 : out of range
59 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0344, expected range: -0.1732 -0.0619
Severely_persistent: avg_biascorr=-0.1903, expected range: -0.0922 -0.0221
NPP ATMS RADIANCES CHANNEL 13 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0074, expected range: -0.3002 -0.2363
Severely_persistent: avg_biascorr=-0.3614, expected range: -0.2954 -0.2282
NPP ATMS RADIANCES (5 channels affected) : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5417, expected range: -0.2918 -0.2888
NOAA20 ATMS RADIANCES CHANNEL 15 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7500, expected range: 0.6218 0.6617
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
76 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3869, expected range: -0.3045 -0.2812
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5258, expected range: -0.4549 -0.3924
Geostationary CSR
All GOES-16 ABI ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 28972.49 42225.27
All GOES-17 GEOS RADIANCES ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 10554.87 74966.24