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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-02-28 12:00

amsua
METOP-B AMSUA RADIANCES CHANNEL 6 : out of range
3 times in the last 10 days for at least one item
Severe: avg_biascorr=0.2795, expected range: 0.2355 0.2606
iasi
All METOP-C IASI ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 8458.75 12336.03
cris
NOAA20 CRIS RADIANCES CHANNEL 257 : out of range
Severe: stdev_fgdepar=0.2607, expected range: 0.1292 0.1953
NOAA20 CRIS RADIANCES CHANNEL 317 : out of range
Severe: stdev_fgdepar=0.2240, expected range: 0.1295 0.1800
airs
AQUA AIRS RADIANCES CHANNEL 1003 : missing
23 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 918.5937 4097.6946
ssmis
All DMSP-17 SSMIS ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 4775.65 11093.67
Radiosondes
All LAND TEMP ALL LAYERS WMO BLOCK 89 : all data missing
Severe: obs_number=0, expected range: 75.23 191.97
All LAND TEMP ALL LAYERS South pole : all data missing
Severe: obs_number=0, expected range: 46.62 129.38
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=302.0000, expected range: 63.7921 67.8746
Considerable: obs_number=697.0000, expected range: 431.5097 492.0903
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=548.0000, expected range: 632.3228 643.2772
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA : missing
2 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 282.7347
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 600-900 (HPA) : out of range
Considerable: rms_fgdepar=1.3187, expected range: 0.5973 1.0353