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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-07-31 00:00

cris
NOAA20 CRIS RADIANCES CHANNEL 965 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.2830, expected range: -0.2549 -0.2038
NOAA20 CRIS RADIANCES CHANNEL 989 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0303, expected range: 0.0564 0.0926
atms
All NPP ATMS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 3867.34 9018.93
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 8 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.1324, expected range: 0.3225 0.4803
DMSP-17 SSMIS RADIANCES CHANNEL 10 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0545, expected range: 0.4011 0.5896
DMSP-17 SSMIS RADIANCES CHANNEL 11 : out of range
23 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0369, expected range: 0.3089 0.3380
Severely_persistent: stdev_norm_fgdepar=0.0235, expected range: 0.1455 0.1468
Slight: stdev_norm_fgdepar=0.0353, expected range: 0.4822 0.4822
DMSP-18 SSMIS RADIANCES CHANNEL 9 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0842, expected range: 0.3767 0.5174
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0337, expected range: 0.3309 0.3773
Severely_persistent: stdev_norm_fgdepar=0.0347, expected range: 0.3498 0.4103
Slight: stdev_norm_fgdepar=0.0507, expected range: 0.4601 0.4601
DMSP-17 SSMIS RADIANCES CHANNEL 9 : out of range
17 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.0932, expected range: 0.2203 0.7017
DMSP-17 SSMIS RADIANCES CHANNEL 17 : out of range
20 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.0871, expected range: 0.6410 0.6410
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
21 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.0309, expected range: 0.5453 0.5453
Atmospheric Motion Vector
All NPP VIIRS AMV IR ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 392.55 2005.95
resat
AURA OMI 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=-4.2321, expected range: -3.2928 -2.8933
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1010-1011 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.5340, expected range: 1.8684 1.9796
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 60-61 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0555, expected range: -0.0199 -0.0183