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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-11 12:00

cris
NPP/CRIS RADIANCES CHANNEL 622 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.3277, expected range: -0.0146 0.1599
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=5.6338, expected range: -0.3076 0.3155
Severely_persistent: stdev_fgdepar=1.5807, expected range: 0.0709 0.3529
NPP/CRIS RADIANCES CHANNEL 1181 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.5480, expected range: -0.1603 0.1687
NPP/CRIS RADIANCES (173 channels affected) : out of range
Severe: obs_number=18970.0000, expected range: 8169.3410 8430.0054
ssmis
DMSP-17/SSMIS RADIANCES (11 channels affected) : out of range
Severe: obs_number=973.0000, expected range: 2147.5840 3587.6160
DMSP-17/SSMIS RADIANCES (6 channels affected) : out of range
Slight: obs_number=5172.0000, expected range: 6596.5532 19520.8570
Atmospheric Motion Vector
METEOSAT-8/AMV CLOUDY WV1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
Considerable: stdev_fgdepar=3.1057, expected range: 2.0343 2.8764
Radiosondes
All LAND TEMP WIND VECTOR DIFF (M/S) ALL LAYERS WMO BLOCK 8 : all data missing
Severe: obs_number=0, expected range: 33.80 77.45
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
Severe: obs_number=197.0000, expected range: 255.7007 269.9464
synop
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
7 times in the last 10 days for at least one item
Severely_persistent: obs_number=87.0000, expected range: 97.7659 100.1230