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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-11-26 18:00

amsua
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
32 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6381, expected range: 0.5230 0.5858
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6332, expected range: 0.5222 0.5844
iasi
METOP-B IASI RADIANCES (37 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0251, expected range: -0.1185 -0.0764
METOP-B IASI RADIANCES CHANNEL 176 : out of range
3 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.3147, expected range: 0.2465 0.2912
METOP-C IASI RADIANCES (12 channels affected) : out of range
Considerable: avg_biascorr=0.0528, expected range: 0.0681 0.0891
cris
NOAA20 CRIS RADIANCES CHANNEL 661 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0425, expected range: -0.2946 -0.1934
NOAA20 CRIS RADIANCES CHANNEL 123 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0719, expected range: -0.0291 0.0263
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0060, expected range: 0.0432 0.0958
NOAA20 CRIS RADIANCES CHANNEL 963 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0369, expected range: -0.0970 -0.0713
airs
AQUA AIRS RADIANCES (11 channels affected) : out of range
Severe: avg_biascorr=-0.2156, expected range: -0.1996 -0.1880
AQUA AIRS RADIANCES CHANNEL 1866 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.5934, expected range: 0.4852 0.5543
atms
NPP ATMS RADIANCES CHANNEL 15 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.8362, expected range: 0.6613 0.7345
NPP ATMS RADIANCES CHANNEL 12 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0980, expected range: -0.3605 -0.2732
NPP ATMS RADIANCES CHANNEL 13 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0236, expected range: -0.3550 -0.2363
Severely_persistent: avg_biascorr=-0.4322, expected range: -0.2918 -0.2210
NPP ATMS RADIANCES CHANNEL 14 : out of range
32 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1929, expected range: -0.0884 0.0254
NOAA20 ATMS RADIANCES CHANNEL 15 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7660, expected range: 0.5876 0.6617
NOAA20 ATMS RADIANCES (5 channels affected) : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1393, expected range: -0.4732 -0.3344
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
68 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5052, expected range: -0.3951 -0.3227
Severely_persistent: avg_biascorr=-0.3463, expected range: -0.3045 -0.2532
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6342, expected range: -0.4598 -0.4081
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 5 : out of range
2 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.0052, expected range: 0.0028 0.0040
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 137254.71
resat
METOP-B GOME-2 OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-2.5541, expected range: -3.0634 -3.0320
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1-2 (HPA) : out of range
61 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.0240, expected range: 0.0115 0.0115