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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-05-18 06:00

amsua
NOAA 15 AMSUA ALL SKY RADIANCES CHANNEL 12 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0377, expected range: -0.0790 -0.0599
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 7 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5978, expected range: -0.5159 -0.4251
NOAA 19 AMSUA ALL SKY RADIANCES CHANNEL 9 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2532, expected range: -0.1833 -0.1486
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 7 : out of range
26 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5373, expected range: -0.4881 -0.4732
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 8 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1530, expected range: 0.2648 0.3803
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 7 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.0731, expected range: -0.9643 -0.9627
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 8 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3107, expected range: -0.2245 -0.1260
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 9 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7248, expected range: -0.6446 -0.6410
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
40 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2880, expected range: -0.2476 -0.2273
NPP ATMS RADIANCES CHANNEL 12 : out of range
41 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4973, expected range: -0.4340 -0.3838
NPP ATMS RADIANCES CHANNEL 13 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4545, expected range: -0.3696 -0.3096
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1682, expected range: -0.2134 -0.2046
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
43 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6142, expected range: -0.5628 -0.4988
resat
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=4.5995, expected range: 2.0622 2.9744
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 40-41 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.1136, expected range: 0.0429 0.0671
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=0.1454, expected range: -0.0290 0.0087
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 20-21 (HPA) : out of range
28 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0448, expected range: -0.0401 -0.0375