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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-05-27 00:00

cris
NPP CRIS RADIANCES CHANNEL 36 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1867, expected range: 0.2699 0.2776
NPP CRIS RADIANCES CHANNEL 42 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2282, expected range: 0.3087 0.3222
NPP CRIS RADIANCES CHANNEL 48 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2126, expected range: 0.2969 0.3075
NPP CRIS RADIANCES CHANNEL 51 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2126, expected range: 0.2957 0.3041
NPP CRIS RADIANCES (17 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1916, expected range: 0.2092 0.2202
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES (6 channels affected) : out of range
Severe: obs_number=48678.0000, expected range: 54278.3090 56960.6910
Atmospheric Motion Vector
All AQUA MODIS CLEAR WV ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 368.37 2049.63
All NPP VIIRS AMV IR ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 1732.89 3424.86
All NOAA20 VIIRS-AMV IR ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 1926.35 3667.40
GOES-16 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
Considerable: stdev_press=62.8414, expected range: 70.7239 86.0152
GOES-17 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
2 times in the last 10 days for at least one item
Slight: obs_number=8336.0000, expected range: 3622.8828 6819.1172
Radiosondes
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 40 : all data missing
Severely_persistent: obs_number=0, expected range: 106.77 137.73
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Severe: rms_fgdepar=3.7810, expected range: 0.4373 1.9231
HIGH RESO LAND TEMP Q (G/KG) (2 pressure layers affected) : out of range
Severe: obs_number=155.0000, expected range: 87.8377 94.1623
Severe: obs_number=155.0000, expected range: 87.8377 94.1623
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : out of range
Severe: obs_number=131.0000, expected range: 192.7204 200.2796
prof
All EUROPEAN WIND PROFILER ALL LAYERS South West Pacific : all data missing
Severe: obs_number=0, expected range: 371.04 680.46
All EUROPEAN WIND PROFILER ALL LAYERS West pacific Tropica : all data missing
Severe: obs_number=0, expected range: 371.04 680.46
EUROPEAN WIND PROFILER VECTOR DIFF (M/S) (2 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=1006.0000, expected range: 2089.2160 2387.7840