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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-11-14 12:00

amsua
NOAA-15/AMSUA RADIANCES CHANNEL 5 : out of range
Slight: obs_number=11627.0000, expected range: 12492.9098 20482.3679
iasi
METOP-B/IASI RADIANCES CHANNEL 95 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5404, expected range: 0.2592 0.4388
METOP-B/IASI RADIANCES CHANNEL 97 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3884, expected range: 0.2509 0.3267
METOP-B/IASI RADIANCES CHANNEL 5992 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5046, expected range: 0.1831 0.3781
METOP-B/IASI RADIANCES CHANNEL 5994 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5389, expected range: 0.1853 0.3970
All METOP-A/IASI RADIANCES ALL CHANNELS Missing
METOP-B/IASI RADIANCES (11 channels affected) : out of range
Severe: avg_biascorr=-0.1019, expected range: 0.1017 0.3634
mhs
ALLSKY NOAA-19/MHS RADIANCES CHANNEL 1 : out of range
Considerable: obs_number=9795.0000, expected range: 10238.0285 11775.8572
ALLSKY NOAA-19/MHS RADIANCES CHANNEL 3 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=9188.0000, expected range: 9558.4507 10976.5778
ALLSKY NOAA-19/MHS RADIANCES CHANNEL 5 : out of range
Considerable: obs_number=9330.0000, expected range: 9783.1725 11253.4561
gmi
ALLSKY GPM/GMI RADIANCES (13 channels affected) : out of range
Considerable: obs_number=1913.0000, expected range: 3273.1175 5380.0107
Atmospheric Motion Vector
METEOSAT-8/AMV CLOUDY WV1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
Slight: obs_number=6178.0000, expected range: 3455.2081 5705.0272
Radiosondes
LAND TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0092, expected range: -0.0028 0.0024
Severely_persistent: rms_fgdepar=0.0165, expected range: 0.0000 0.0074
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=131.0000, expected range: 61.5949 70.1698
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (3 pressure layers affected : out of range
Severe: obs_number=450.0000, expected range: 247.2034 359.7377
HIGH RESO LAND TEMP TEMPERATURE (K) (3 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=313.0000, expected range: 130.5691 186.3721
LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0397, expected range: -0.5229 -0.1552
LAND TEMP TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=107.0000, expected range: 140.0445 261.3999
HIGH RESO SEA TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : out of range
3 times in the last 10 days for at least one item
Considerable: avg_fgdepar=0.0095, expected range: -0.0057 0.0030
buoy
MOORED BUOYS SURFACE PRESSURE (PA) : out of range
Severe: avg_biascorr=-25.7377, expected range: -8.4342 7.8900