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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-05-28 12:00

cris
NPP CRIS RADIANCES CHANNEL 51 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2296, expected range: 0.2957 0.3076
NPP CRIS RADIANCES CHANNEL 48 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2347, expected range: 0.2969 0.3141
NPP CRIS RADIANCES CHANNEL 42 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2505, expected range: 0.3087 0.3298
NPP CRIS RADIANCES CHANNEL 36 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2115, expected range: 0.2699 0.2863
NOAA20 CRIS RADIANCES CHANNEL 48 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1483, expected range: 0.2203 0.3081
airs
AQUA AIRS RADIANCES (49 channels affected) : out of range
Considerable: obs_number=16027.0000, expected range: 18120.6933 19318.9537
gpsro
All FY-3C GNOS RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 467.59 2312.99
Atmospheric Motion Vector
METEOSAT-8 AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=563.0000, expected range: 24.1977 411.3023
GOES-16 AMV VIS1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HPA) : out of range
Considerable: obs_number=8062.0000, expected range: 9215.8751 11622.3749
Radiosondes
All LAND TEMP ALL LAYERS WMO BLOCK 43 : all data missing
Severely_persistent: obs_number=0, expected range: 51.38 148.12
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 84 : all data missing
Severe: obs_number=0, expected range: 67.94 91.56
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 76 : all data missing
Severe: obs_number=0, expected range: 31.97 642.31
LAND TEMP Q (G/KG) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=188.0000, expected range: 26.2348 120.5484
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=152.0000, expected range: 22.1169 77.1331
HIGH RESO LAND TEMP Q (G/KG) (4 pressure layers affected) : out of range
Considerable: obs_number=63.0000, expected range: 105.4763 142.0237
prof
All EUROPEAN WIND PROFILER ALL LAYERS West pacific Tropica : all data missing
Severe: obs_number=0, expected range: 120.65 1163.01
All EUROPEAN WIND PROFILER ALL LAYERS South West Pacific : all data missing
Severe: obs_number=0, expected range: 120.65 1163.01