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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-09-27 18:00

iasi
METOP-B IASI RADIANCES CHANNEL 135 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3303, expected range: 0.3625 0.4018
METOP-B IASI RADIANCES CHANNEL 141 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3022, expected range: 0.3312 0.3674
METOP-B IASI RADIANCES CHANNEL 119 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2827, expected range: 0.2382 0.2636
METOP-B IASI RADIANCES CHANNEL 138 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2623, expected range: 0.2203 0.2415
METOP-B IASI RADIANCES CHANNEL 163 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2536, expected range: 0.2165 0.2368
METOP-C IASI RADIANCES CHANNEL 61 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3443, expected range: 0.2518 0.3022
METOP-C IASI RADIANCES CHANNEL 79 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3968, expected range: 0.2961 0.3256
METOP-C IASI RADIANCES CHANNEL 85 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3815, expected range: 0.2221 0.2842
METOP-C IASI RADIANCES CHANNEL 59 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3706, expected range: 0.2969 0.3304
METOP-C IASI RADIANCES CHANNEL 83 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4241, expected range: 0.2769 0.3338
METOP-C IASI RADIANCES CHANNEL 386 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0008, expected range: 0.0862 0.1368
METOP-C IASI RADIANCES (38 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0779, expected range: 0.1173 0.1683
mwhs2
All FY-3C MWHS2 ALLSKY ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 28519.70
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 11 : out of range
4 times in the last 10 days for at least one item
Slight: obs_number=4741.0000, expected range: 12411.5516 41401.9482
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 12 : out of range
4 times in the last 10 days for at least one item
Slight: obs_number=4738.0000, expected range: 12327.2938 41174.0628
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 13 : out of range
4 times in the last 10 days for at least one item
Slight: obs_number=4065.0000, expected range: 10202.1517 33604.4845
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3297, expected range: -0.3057 -0.2786
NPP ATMS RADIANCES CHANNEL 9 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5370, expected range: -0.4736 -0.4053
NOAA20 ATMS RADIANCES CHANNEL 10 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4763, expected range: -0.4350 -0.4256
NOAA20 ATMS RADIANCES CHANNEL 8 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7295, expected range: -0.6085 -0.5692
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 129126.17