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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-01-12 00:00

amsua
NOAA-18 AMSUA RADIANCES CHANNEL 9 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5135, expected range: -0.6764 -0.6717
All AQUA AMSUA ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 3248.81 6038.90
iasi
METOP-B IASI RADIANCES CHANNEL 185 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2790, expected range: -0.2465 -0.2166
METOP-B IASI RADIANCES CHANNEL 187 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3246, expected range: -0.2856 -0.2427
METOP-B IASI RADIANCES CHANNEL 201 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1295, expected range: 0.1486 0.1622
METOP-B IASI RADIANCES CHANNEL 207 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2518, expected range: -0.2181 -0.1918
METOP-B IASI RADIANCES CHANNEL 214 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1281, expected range: -0.1008 -0.0796
METOP-B IASI RADIANCES CHANNEL 222 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0847, expected range: 0.0990 0.1069
METOP-B IASI RADIANCES CHANNEL 1513 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1014, expected range: 0.0547 0.0574
METOP-B IASI RADIANCES CHANNEL 1658 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3879, expected range: 0.2484 0.3059
METOP-C IASI RADIANCES (27 channels affected) : out of range
Considerable: obs_number=881.0000, expected range: 1209.1682 2006.6500
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 1283.39 11953.30
mhs
METOP-C MHS ALLSKY RADIANCES CHANNEL 3 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=3239.0000, expected range: 5395.1825 5907.2418
METOP-C MHS ALLSKY RADIANCES CHANNEL 5 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=3157.0000, expected range: 4835.2407 5583.1229
METOP-C MHS ALLSKY RADIANCES CHANNEL 4 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=3245.0000, expected range: 5028.1593 5952.6286
gpsro
All COSMIC-6 GPSRO SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1204.48
All COSMIC2-E6 GPSRO RISING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 319.45 1549.64
METOP-C GRAS SETTING (12 impact heights affected) : out of range
Considerable: obs_number=642.0000, expected range: 809.1664 1287.5609
amdar
ADS-C WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=270.0000, expected range: 2.2761 173.6967