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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-04-15 12:00

amsua
METOP-C AMSUA RADIANCES (10 channels affected) : out of range
Considerable: obs_number=2139.0000, expected range: 3495.7281 7299.4484
iasi
METOP-C IASI RADIANCES (12 channels affected) : out of range
Considerable: obs_number=2049.0000, expected range: 1475.2884 1928.1234
cris
NPP CRIS RADIANCES CHANNEL 85 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0872, expected range: -0.0794 -0.0752
NPP CRIS RADIANCES CHANNEL 87 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0148, expected range: -0.0075 -0.0056
NPP CRIS RADIANCES CHANNEL 88 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0301, expected range: -0.0250 -0.0234
NPP CRIS RADIANCES CHANNEL 91 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0398, expected range: 0.0534 0.0535
NPP CRIS RADIANCES CHANNEL 92 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0987, expected range: 0.1105 0.1118
NOAA20 CRIS RADIANCES CHANNEL 143 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0976, expected range: -0.0888 -0.0881
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0441, expected range: 0.0499 0.0553
NOAA20 CRIS RADIANCES CHANNEL 123 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0507, expected range: -0.0455 -0.0395
NOAA20 CRIS RADIANCES CHANNEL 124 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0779, expected range: -0.0697 -0.0637
NPP CRIS RADIANCES CHANNEL 106 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_fgdepar=-0.0447, expected range: -0.0346 -0.0168
airs
AQUA AIRS RADIANCES CHANNEL 239 : out of range
2 times in the last 10 days for at least one item
Severe: avg_fgdepar=-0.1349, expected range: -0.0861 -0.0314
AQUA AIRS RADIANCES CHANNEL 253 : out of range
1 times in the last 10 days for at least one item
Severe: avg_fgdepar=-0.1699, expected range: -0.0956 -0.0466
AQUA AIRS RADIANCES (34 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=817.0000, expected range: 984.6271 1165.0398
AQUA AIRS RADIANCES CHANNEL 232 : out of range
Considerable: avg_fgdepar=-0.1103, expected range: -0.0832 -0.0364
AQUA AIRS RADIANCES CHANNEL 185 : out of range
Slight: avg_fgdepar=-0.0055, expected range: 0.0007 0.0237
AQUA AIRS RADIANCES CHANNEL 1869 : out of range
Slight: stdev_fgdepar=0.2656, expected range: 0.2253 0.2531
amdar
ADS-C TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : missing
7 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 0.0000 295.3013