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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-02-26 18:00

iasi
All METOP-C IASI ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 8948.94 11893.50
cris
NOAA20 CRIS RADIANCES (12 channels affected) : out of range
Considerable: obs_number=1820.0000, expected range: 2307.9575 2775.9092
airs
AQUA AIRS RADIANCES CHANNEL 1003 : missing
16 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 918.5937 4097.6946
atms
NOAA20 ATMS RADIANCES CHANNEL 19 : out of range
Slight: obs_number=5774.0000, expected range: 7054.6865 9468.9802
Radiosondes
All HIGH RESO SEA TEMP ALL LAYERS Tropics : all data missing
Severely_persistent: obs_number=0, expected range: 74.13 114.54
All HIGH RESO SEA TEMP ALL LAYERS Alantic Tropical are : all data missing
Severely_persistent: obs_number=0, expected range: 74.13 114.54
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : missing
Severe: obs_number=0.0000, expected range: 0.0000 377.1602
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 72 : all data missing
Severe: obs_number=0, expected range: 0.00 1044.09
All HIGH RESO LAND TEMP ALL LAYERS West pacific Tropica : all data missing
Severe: obs_number=0, expected range: 64.31 294.92
prof
All EUROPEAN WIND PROFILER ALL LAYERS South West Pacific : all data missing
Severe: obs_number=0, expected range: 181.94 387.81
All EUROPEAN WIND PROFILER ALL LAYERS West pacific Tropica : all data missing
Severe: obs_number=0, expected range: 181.94 387.81
EUROPEAN WIND PROFILER VECTOR DIFF (M/S) (2 pressure layers affected) : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=489.0000, expected range: 1003.9831 1156.0169
buoy
MOORED BUOYS WIND VECTOR DIFF (M/S) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=109.0000, expected range: 94.8747 97.0301