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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-11-09 12:00

iasi
METOP-B/IASI RADIANCES CHANNEL 97 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3826, expected range: 0.2231 0.3267
METOP-B/IASI RADIANCES CHANNEL 95 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.6521, expected range: 0.2018 0.4675
METOP-B/IASI RADIANCES CHANNEL 92 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.8349, expected range: 0.0775 0.5727
METOP-B/IASI RADIANCES CHANNEL 5988 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4999, expected range: 0.1740 0.3856
METOP-B/IASI RADIANCES CHANNEL 5992 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4964, expected range: 0.1831 0.3781
METOP-B/IASI RADIANCES CHANNEL 5994 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5442, expected range: 0.1853 0.3970
METOP-B/IASI RADIANCES CHANNEL 83 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1273, expected range: 0.1017 0.3568
METOP-B/IASI RADIANCES CHANNEL 89 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.2519, expected range: 0.2995 0.4736
METOP-C/IASI RADIANCES CHANNEL 16 : out of range
Considerable: stdev_fgdepar=0.5581, expected range: 0.4093 0.5138
airs
AQUA/AIRS RADIANCES (15 channels affected) : out of range
Severe: avg_biascorr=-0.2051, expected range: 0.0233 0.2265
atms
NOAA20/ATMS RADIANCES CHANNEL 7 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2117, expected range: -0.1970 -0.1692
Radiosondes
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected : out of range
Severe: obs_number=439.0000, expected range: 329.0447 368.7331
HIGH RESO SEA TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : missing
1 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 348.5836
HIGH RESO LAND TEMP Q (G/KG) (2 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=421.0000, expected range: 314.1966 377.6858
prof
EUROPEAN WIND PROFILER VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : missing
1 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 890.3263
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
4 times in the last 10 days for at least one item
Severe: obs_number=214.0000, expected range: 269.9052 338.7614