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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-04-30 00:00

amsua
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1860, expected range: -0.2766 -0.2699
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4138, expected range: 0.3327 0.3574
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 7 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4537, expected range: -0.3719 -0.3170
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1328, expected range: -0.1950 -0.1841
cris
NOAA20 CRIS RADIANCES (16 channels affected) : out of range
Severe: stdev_fgdepar=0.6400, expected range: 0.2925 0.4438
NOAA20 CRIS RADIANCES CHANNEL 75 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=1650.0000, expected range: 1851.6245 2471.7505
NOAA20 CRIS RADIANCES CHANNEL 78 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=1590.0000, expected range: 1780.4278 2487.1972
NOAA20 CRIS RADIANCES CHANNEL 113 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=1868.0000, expected range: 2059.6148 2444.8852
mhs
NOAA-19 MHS ALLSKY RADIANCES CHANNEL 5 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0783, expected range: -0.0263 0.0308
METOP-B MHS ALLSKY RADIANCES CHANNEL 4 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1512, expected range: 0.0507 0.0966
METOP-C MHS ALLSKY RADIANCES CHANNEL 5 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1878, expected range: 0.0840 0.1393
atms
NPP ATMS RADIANCES CHANNEL 14 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0268, expected range: -0.0408 -0.0076
NPP ATMS RADIANCES CHANNEL 13 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1242, expected range: -0.1926 -0.1760
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3099, expected range: -0.3805 -0.3552
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1528, expected range: -0.2400 -0.2109
ssmis
DMSP-18 SSMIS RADIANCES CHANNEL 4 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.3063, expected range: -1.1677 -1.0597
gpsro
COSMIC2-E4 GPSRO RISING (24 impact heights affected) : out of range
Considerable: obs_number=729.0000, expected range: 1230.3807 2591.2443
COSMIC2-E6 GPSRO SETTING HEIGHT 28-30 KM : out of range
Slight: stdev_norm_fgdepar=1.3524, expected range: 1.0827 1.2967
Atmospheric Motion Vector
GOES-16 AMV CLOUDY WV3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 ( : out of range
Considerable: obs_number=363.0000, expected range: 55.2787 227.2213