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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-04-29 00:00

amsua
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2465, expected range: -0.3140 -0.3109
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3815, expected range: 0.2926 0.3108
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 12 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3990, expected range: -0.4621 -0.4281
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1639, expected range: -0.2427 -0.2331
ssmis
DMSP-18 SSMIS RADIANCES CHANNEL 4 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.1714, expected range: -0.8682 -0.8379
gpsro
COSMIC2-E3 GPSRO SETTING HEIGHT 32-34 KM : out of range
Slight: stdev_norm_fgdepar=1.4152, expected range: 0.8944 1.2952
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 25430-25431 (HPA) : out of range
26 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=4.2775, expected range: 1.4829 2.8678
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 40-41 (HPA) : out of range
32 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0832, expected range: 0.0512 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=0.0672, expected range: -0.0100 0.0087
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1-2 (HPA) : out of range
71 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.0084, expected range: 0.0038 0.0063
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 63940-63941 (HPA) : out of range
11 times in the last 10 days for at least one item
Slight: stdev_fgdepar=2.9052, expected range: 1.7521 2.6790