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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-09-24 18:00

iasi
METOP-C IASI RADIANCES CHANNEL 59 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3008, expected range: 0.3212 0.3478
Severely_persistent: avg_biascorr=0.4474, expected range: -0.0012 0.2522
METOP-C IASI RADIANCES CHANNEL 386 : out of range
28 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0450, expected range: 0.0862 0.1180
METOP-C IASI RADIANCES (35 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1541, expected range: 0.2242 0.2296
mwhs2
All FY-3C MWHS2 ALLSKY ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 30392.66
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
23 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3432, expected range: -0.3057 -0.2687
NPP ATMS RADIANCES CHANNEL 9 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5424, expected range: -0.4736 -0.3845
NOAA20 ATMS RADIANCES CHANNEL 8 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6960, expected range: -0.6085 -0.5700
Atmospheric Motion Vector
GOES-16 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=401.0000, expected range: 169.6552 270.0591
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 122860.20
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 40-41 (HPA) : out of range
2 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.0456, expected range: 0.0117 0.0423