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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-05-08 12:00

iasi
METOP-A IASI RADIANCES (12 channels affected) : out of range
Severe: avg_biascorr=-0.0325, expected range: -0.0053 0.0004
METOP-B IASI RADIANCES (13 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.1211, expected range: -0.1023 -0.0860
cris
NPP CRIS RADIANCES CHANNEL 94 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0852, expected range: 0.1096 0.1162
NPP CRIS RADIANCES CHANNEL 120 : out of range
2 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0861, expected range: -0.0725 -0.0674
Considerable: avg_fgdepar=-0.0596, expected range: -0.0450 -0.0172
NPP CRIS RADIANCES CHANNEL 123 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0661, expected range: -0.0591 -0.0503
NPP CRIS RADIANCES CHANNEL 126 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0975, expected range: -0.0857 -0.0835
NPP CRIS RADIANCES CHANNEL 141 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0995, expected range: -0.0899 -0.0854
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0381, expected range: 0.0499 0.0546
Severely_persistent: avg_biascorr=-0.0545, expected range: -0.0491 -0.0458
NOAA20 CRIS RADIANCES CHANNEL 92 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1504, expected range: 0.1752 0.1765
NOAA20 CRIS RADIANCES CHANNEL 93 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1368, expected range: 0.1602 0.1639
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0197, expected range: 0.0375 0.0457
NOAA20 CRIS RADIANCES CHANNEL 122 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0267, expected range: -0.0148 -0.0027
NPP CRIS RADIANCES (16 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0915, expected range: -0.0794 -0.0750
NPP CRIS RADIANCES CHANNEL 118 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_fgdepar=-0.0601, expected range: -0.0442 -0.0173
NPP CRIS RADIANCES CHANNEL 122 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_fgdepar=-0.0552, expected range: -0.0409 -0.0131
NOAA20 CRIS RADIANCES CHANNEL 74 : out of range
Considerable: obs_number=2531.0000, expected range: 1993.2869 2422.5955
NOAA20 CRIS RADIANCES CHANNEL 76 : out of range
Considerable: obs_number=2530.0000, expected range: 1990.2816 2420.7772
airs
AQUA AIRS RADIANCES CHANNEL 1869 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0515, expected range: -0.0998 -0.0792
AQUA AIRS RADIANCES CHANNEL 232 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7927, expected range: -0.7141 -0.6733
AQUA AIRS RADIANCES CHANNEL 256 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6323, expected range: -0.5895 -0.5365
AQUA AIRS RADIANCES (37 channels affected) : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=844.0000, expected range: 915.0100 1072.7088
atms
NOAA20 ATMS RADIANCES CHANNEL 7 : out of range
Considerable: obs_number=2895.0000, expected range: 2345.7966 2726.5563
NOAA20 ATMS RADIANCES CHANNEL 8 : out of range
Considerable: obs_number=3040.0000, expected range: 2528.5385 2826.6379
gpsro
METOP-B GRAS SETTING HEIGHT 14-16 KM : out of range
Considerable: obs_number=652.0000, expected range: 461.9329 612.8906
amdar
ADS-C TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : missing
8 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 38.8587 202.9641