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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-08-16 00:00

iasi
METOP-B IASI RADIANCES CHANNEL 314 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0115, expected range: 0.0659 0.1372
METOP-C IASI RADIANCES CHANNEL 2889 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2692, expected range: -0.3398 -0.3056
METOP-B IASI RADIANCES (17 channels affected) : out of range
Severe: avg_biascorr=-0.2380, expected range: -0.1728 -0.0975
METOP-B IASI RADIANCES (50 channels affected) : out of range
Severe: avg_biascorr=0.6503, expected range: 0.5310 0.5927
METOP-C IASI RADIANCES CHANNEL 222 : out of range
Severe: avg_biascorr=0.0030, expected range: 0.0212 0.0441
METOP-B IASI RADIANCES (19 channels affected) : out of range
Considerable: avg_biascorr=-0.0842, expected range: -0.0552 -0.0091
METOP-C IASI RADIANCES (25 channels affected) : out of range
Considerable: avg_biascorr=0.1928, expected range: 0.2220 0.2624
METOP-B IASI RADIANCES CHANNEL 230 : out of range
Slight: stdev_fgdepar=0.2684, expected range: 0.2344 0.2641
cris
All NPP CRIS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 6111.82 8979.24
NOAA20 CRIS RADIANCES CHANNEL 665 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0724, expected range: 0.0309 0.0546
NOAA20 CRIS RADIANCES CHANNEL 949 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2164, expected range: -0.1890 -0.1737
NOAA20 CRIS RADIANCES CHANNEL 963 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1014, expected range: -0.0651 -0.0593
NOAA20 CRIS RADIANCES CHANNEL 965 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2876, expected range: -0.2549 -0.2429
NOAA20 CRIS RADIANCES CHANNEL 989 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0186, expected range: 0.0564 0.0599
NOAA20 CRIS RADIANCES CHANNEL 993 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1813, expected range: 0.1992 0.2157
NOAA20 CRIS RADIANCES CHANNEL 1061 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2995, expected range: 0.3290 0.3541
NOAA20 CRIS RADIANCES CHANNEL 62 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1970, expected range: 0.2233 0.2268
NOAA20 CRIS RADIANCES CHANNEL 65 : out of range
23 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1972, expected range: 0.2159 0.2268
NOAA20 CRIS RADIANCES CHANNEL 118 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2533, expected range: -0.1545 -0.1294
NOAA20 CRIS RADIANCES CHANNEL 140 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3312, expected range: -0.2885 -0.2588
airs
AQUA AIRS RADIANCES CHANNEL 672 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0543, expected range: 0.0605 0.0667
AQUA AIRS RADIANCES CHANNEL 207 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0580, expected range: -0.0828 -0.0734
atms
All NPP ATMS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 3724.11 8948.40
gpsro
METOP-B GRAS SETTING (23 impact heights affected) : out of range
Slight: obs_number=800.0000, expected range: 1015.6103 1418.1473
Atmospheric Motion Vector
All NPP VIIRS AMV IR ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 641.66 1558.47
METEOSAT-11 AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA : out of range
Considerable: avg_fgdepar=1.7225, expected range: 1.9616 2.2691
GOES-17 AMV VIS1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HPA) : out of range
Considerable: obs_number=2732.0000, expected range: 12098.7151 17803.7849
resat
AURA OMI OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-3.4708, expected range: -1.9682 -1.4500
Severely_persistent: avg_biascorr=-5.3767, expected range: -3.9705 -3.9303
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1010-1011 (HPA) : out of range
38 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.4973, expected range: 1.6016 1.9796
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 60-61 (HPA) : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0380, expected range: -0.0186 -0.0183
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 250-251 (HPA) : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.3592, expected range: 0.0216 0.1883
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 25430-25431 (HPA) : out of range
8 times in the last 10 days for at least one item
Slight: stdev_fgdepar=2.9551, expected range: 1.9738 2.9365