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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-01-02 00:00

amsua
NOAA-18 AMSUA RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.8414, expected range: 0.3691 0.6759
NOAA-19 AMSUA RADIANCES CHANNEL 13 : out of range
Considerable: stdev_fgdepar=0.6035, expected range: 0.4737 0.5578
METOP-A AMSUA RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.6450, expected range: 0.5096 0.5967
METOP-B AMSUA RADIANCES CHANNEL 13 : out of range
Considerable: stdev_fgdepar=0.8221, expected range: 0.3210 0.6479
METOP-C AMSUA RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.5977, expected range: 0.4303 0.5285
METOP-C AMSUA RADIANCES CHANNEL 14 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=1.0438, expected range: 0.6918 0.9145
NOAA-15 AMSUA RADIANCES CHANNEL 13 : out of range
Slight: stdev_fgdepar=0.5788, expected range: 0.4362 0.5316
METOP-A AMSUA RADIANCES CHANNEL 14 : out of range
2 times in the last 10 days for at least one item
Slight: stdev_fgdepar=1.1082, expected range: 0.8091 1.0274
iasi
METOP-A IASI RADIANCES CHANNEL 185 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3353, expected range: -0.3151 -0.2904
METOP-A IASI RADIANCES CHANNEL 207 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3136, expected range: -0.2803 -0.2455
METOP-A IASI RADIANCES CHANNEL 222 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0375, expected range: 0.0557 0.0729
METOP-B IASI RADIANCES CHANNEL 185 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2686, expected range: -0.2465 -0.2187
METOP-B IASI RADIANCES CHANNEL 1509 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0398, expected range: -0.1295 -0.0650
METOP-B IASI RADIANCES CHANNEL 1639 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0478, expected range: -0.1013 -0.0500
METOP-B IASI RADIANCES CHANNEL 1658 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3969, expected range: 0.2596 0.3059
METOP-C IASI RADIANCES (11 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.3602, expected range: -0.3285 -0.3124
cris
NOAA20 CRIS RADIANCES (20 channels affected) : out of range
Considerable: stdev_fgdepar=0.2043, expected range: 0.1171 0.1721
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 4510.14 8989.24
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 3 : out of range
2 times in the last 10 days for at least one item
Slight: avg_norm_fgdepar=-0.1798, expected range: -0.1094 0.1025
atms
NPP ATMS RADIANCES CHANNEL 15 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=1.9316, expected range: -0.5882 0.6752
NPP ATMS RADIANCES (5 channels affected) : out of range
Severe: stdev_fgdepar=0.2793, expected range: 0.1601 0.2272
NOAA20 ATMS RADIANCES (5 channels affected) : out of range
Severe: stdev_fgdepar=0.2553, expected range: 0.1315 0.1916
NOAA20 ATMS RADIANCES CHANNEL 15 : out of range
4 times in the last 10 days for at least one item
Severe: avg_fgdepar=1.8914, expected range: -0.5380 0.7789
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_fgdepar=0.6025, expected range: -0.3169 0.2234
resat
All AURA OMI ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 2876.09 17296.61