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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-07-12 12:00

saphir
All MEGHA-TROPIQUES SAPHIR ALLSKY ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 3398.11 4942.35
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 30-31 (HPA) : out of range
1 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.0252, expected range: 0.0209 0.0232
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 10-11 (HPA) : out of range
5 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.0042, expected range: 0.0037 0.0037
Radiosondes
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected : missing
8 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 5.4502 676.0244
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (3 pressure layers affected : missing
10 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 176.9257 196.0743
LAND TEMP TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : out of range
Severe: rms_fgdepar=4.5904, expected range: 0.7511 1.7444
Severe: rms_fgdepar=6.2963, expected range: 0.4474 2.7904
Considerable: obs_number=117.0000, expected range: 24.9841 67.0159
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 83 : all data missing
Severe: obs_number=0, expected range: 30.15 353.68
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 84 : all data missing
Severe: obs_number=0, expected range: 116.58 133.02
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 600-900 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=83.0000, expected range: 116.1042 175.0958
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 600-900 (HPA) : out of range
Considerable: obs_number=56.0000, expected range: 69.3603 91.0397
Considerable: obs_number=5513.0000, expected range: 3731.3810 4691.6190
airep
All AIREP ALL LAYERS Indian Ocean : all data missing
Severely_persistent: obs_number=0, expected range: 25.80 312.85
ship
All BUFR SHIP SYNOP WMO BLOCK 41 : all data missing
Severely_persistent: obs_number=0, expected range: 132.47 178.14
All BUFR SHIP SYNOP WMO BLOCK 42 : all data missing
Severely_persistent: obs_number=0, expected range: 101.72 189.20
snow
BUFR LAND SYNOP SNOW (CM) : out of range
2 times in the last 10 days for at least one item
Severe: avg_fgdepar=-107.4201, expected range: -70.9204 -57.7932
Severe: rms_fgdepar=595.0468, expected range: 435.6130 484.0604