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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Ensemble Data Assimilation at 2021-09-14 12:00

amsua
NOAA-19 AMSUA RADIANCES CHANNEL 4 : out of range
Severe: stdev_fgdepar=0.3129, expected range: 0.2602 0.2887
METOP-B AMSUA RADIANCES CHANNEL 5 : out of range
Considerable: obs_number=6029.0000, expected range: 8623.4440 16917.8502
iasi
All METOP-A IASI ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 14724.56 29483.02
airs
AQUA AIRS RADIANCES CHANNEL 1095 : out of range
Considerable: stdev_fgdepar=0.3892, expected range: 0.2578 0.3444
amsr2
AMSR2 GCOM-W1 ALLSKY RADIANCES (6 channels affected) : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=3172.0000, expected range: 3613.9789 5136.7270
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 2 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=49759.0000, expected range: 55098.0569 58447.7078
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 3 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=49759.0000, expected range: 55097.4803 58449.6961
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 4 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=49760.0000, expected range: 55098.1341 58449.5130
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 10 : out of range
Considerable: obs_number=28865.0000, expected range: 31754.9450 36473.0550
DMSP-17 SSMIS RADIANCES CHANNEL 11 : out of range
Considerable: obs_number=30233.0000, expected range: 33089.4276 38354.5724
DMSP-17 SSMIS RADIANCES (6 channels affected) : out of range
Considerable: obs_number=5591.0000, expected range: 6267.7090 7230.8793
gpsro
All TERRASAR-X GPSRO SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 170.28 1524.02
METOP-A GRAS SETTING HEIGHT 34-36 KM : out of range
Considerable: stdev_norm_fgdepar=0.7512, expected range: 0.9014 1.1995
METOP-C GRAS SETTING HEIGHT 2-4 KM : out of range
Slight: stdev_norm_fgdepar=0.7792, expected range: 0.9374 1.3301
METOP-C GRAS SETTING HEIGHT 28-30 KM : out of range
Slight: stdev_norm_fgdepar=0.9877, expected range: 1.0610 1.2909
amdar
All TAMDAR ALL LAYERS East pacific Tropica : all data missing
Severe: obs_number=0, expected range: 0.00 255.89
All TAMDAR ALL LAYERS North East Pacific : all data missing
Severe: obs_number=0, expected range: 0.00 427.77