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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-06-28 06:00

amsua
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0733, expected range: 0.1409 0.1877
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4465, expected range: -0.3762 -0.3015
iasi
METOP-B IASI RADIANCES CHANNEL 89 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2605, expected range: -0.1739 -0.0775
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=0.1772, expected range: 0.2070 0.2380
METOP-C IASI RADIANCES CHANNEL 144 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1673, expected range: 0.1907 0.2191
METOP-C IASI RADIANCES CHANNEL 183 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1573, expected range: 0.1861 0.2160
METOP-C IASI RADIANCES CHANNEL 189 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1260, expected range: 0.1539 0.1807
METOP-C IASI RADIANCES CHANNEL 195 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0894, expected range: 0.1161 0.1394
gpsro
METOP-C GRAS SETTING (24 impact heights affected) : out of range
Slight: obs_number=448.0000, expected range: 581.7490 1019.7216
Atmospheric Motion Vector
AQUA MODIS CLEAR WV WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
12 times in the last 10 days for at least one item
Severely_persistent: obs_number=54.0000, expected range: 0.0000 4.7974
All NPP VIIRS AMV IR ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 592.37 1575.11
DUAL-METOP AMV IR WIND VECTOR DIFF (M/S) (2 pressure layers affected) : out of range
Considerable: obs_number=997.0000, expected range: 1711.1701 2329.0799
resat
AURA OMI OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-3.8179, expected range: -3.2928 -2.7160
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 25430-25431 (HPA) : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=4.0029, expected range: 1.4735 2.8153
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 10-11 (HPA) : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0399, expected range: -0.0477 -0.0433
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 40-41 (HPA) : out of range
41 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0922, expected range: 0.0581 0.0582
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 100-101 (HPA) : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.1999, expected range: 0.1196 0.1512
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 640-641 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-3.1478, expected range: -2.4521 -2.3126