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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-06-17 00:00

iasi
METOP-A IASI RADIANCES CHANNEL 106 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1416, expected range: -0.0905 -0.0690
METOP-A IASI RADIANCES CHANNEL 151 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0254, expected range: 0.0689 0.1128
METOP-A IASI RADIANCES CHANNEL 176 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0789, expected range: -0.0397 -0.0379
METOP-B IASI RADIANCES CHANNEL 106 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0910, expected range: -0.0494 -0.0385
METOP-B IASI RADIANCES CHANNEL 170 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0307, expected range: 0.0499 0.0746
METOP-C IASI RADIANCES CHANNEL 106 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1700, expected range: -0.1230 -0.0974
METOP-C IASI RADIANCES CHANNEL 176 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1057, expected range: -0.0785 -0.0638
METOP-B IASI RADIANCES CHANNEL 176 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0400, expected range: -0.0296 -0.0097
airs
AQUA AIRS RADIANCES CHANNEL 672 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1418, expected range: -0.1201 -0.1179
AQUA AIRS RADIANCES CHANNEL 1865 : out of range
3 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.1796, expected range: -0.1687 -0.1574
gpsro
COSMIC2-E1 GPSRO RISING (24 impact heights affected) : out of range
Considerable: obs_number=1002.0000, expected range: 1766.3416 2750.9084
COSMIC2-E2 GPSRO SETTING (23 impact heights affected) : out of range
Considerable: obs_number=2369.0000, expected range: 2875.9590 4526.8410
COSMIC2-E3 GPSRO RISING (24 impact heights affected) : out of range
Considerable: obs_number=697.0000, expected range: 950.0925 1790.7825
COSMIC2-E4 GPSRO SETTING (24 impact heights affected) : out of range
Considerable: obs_number=1444.0000, expected range: 1977.0505 3058.0745
COSMIC2-E5 GPSRO SETTING HEIGHT 44-46 KM : out of range
Slight: stdev_norm_fgdepar=0.7757, expected range: 0.4212 0.6948
Atmospheric Motion Vector
METEOSAT-11 AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HP : out of range
Slight: avg_fgdepar=1.3597, expected range: 1.5136 1.7612