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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-09-21 12:00

iasi
All METOP-A/IASI RADIANCES ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 25225.88
mhs
ALLSKY METOP-A/MHS RADIANCES CHANNEL 1 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=2246.0000, expected range: 3647.0610 6910.0857
ALLSKY METOP-A/MHS RADIANCES CHANNEL 3 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=2354.0000, expected range: 3961.4940 7352.4260
ALLSKY METOP-A/MHS RADIANCES CHANNEL 4 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=2325.0000, expected range: 3719.3557 7259.7643
ALLSKY METOP-A/MHS RADIANCES CHANNEL 5 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=2201.0000, expected range: 3640.1798 6806.3268
ALLSKY METOP-A/MHS RADIANCES CHANNEL 2 : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=4543.0000, expected range: 6844.9632 15231.7302
saphir
All ALLSKY SAPHIR RADIANCES ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 826.11 10926.31
gpsro
All TERRASAR-X SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1423.11
Atmospheric Motion Vector
METEOSAT-11/AMV VIS2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (H : out of range
Slight: stdev_press=24.8506, expected range: 25.7471 30.8418
Radiosondes
LAND TEMP TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : out of range
Severe: rms_fgdepar=1.7713, expected range: 1.1715 1.4955
LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected) : out of range
Severe: rms_fgdepar=6.8915, expected range: 0.6401 4.2046
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_fgdepar=1.0400, expected range: -0.2996 0.1811
Severe: rms_fgdepar=2.0533, expected range: 0.0000 0.5634
Severe: avg_biascorr=0.0005, expected range: -0.0001 0.0001
LAND TEMP TEMPERATURE (K) (4 pressure layers affected) : out of range
Considerable: obs_number=203.0000, expected range: 324.3001 545.9221
LAND TEMP WIND VECTOR DIFF (M/S) (4 pressure layers affected) : out of range
Considerable: obs_number=251.0000, expected range: 361.0310 736.9690
LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
Considerable: obs_number=54.0000, expected range: 132.6420 291.7110
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
11 times in the last 10 days for at least one item
Severely_persistent: rms_fgdepar=123.9250, expected range: 19.2766 71.0107
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
Considerable: avg_biascorr=797.1429, expected range: 47.7048 504.7940
buoy
MOORED BUOYS WIND VECTOR DIFF (M/S) : out of range
12 times in the last 10 days for at least one item
Severely_persistent: obs_number=115.0000, expected range: 85.1500 93.2554