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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-11-05 00:00

iasi
METOP-B/IASI RADIANCES CHANNEL 5994 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5070, expected range: 0.1876 0.3970
airs
AQUA/AIRS RADIANCES CHANNEL 2084 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.9814, expected range: 0.1242 0.4711
AQUA/AIRS RADIANCES CHANNEL 2085 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=1.0266, expected range: 0.1300 0.5602
AQUA/AIRS RADIANCES CHANNEL 20 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1130, expected range: 0.0233 0.2118
AQUA/AIRS RADIANCES CHANNEL 63 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4753, expected range: -0.3076 -0.0010
AQUA/AIRS RADIANCES CHANNEL 375 : missing
Severe: obs_number=0.0000, expected range: 2586.7296 6780.3007
AQUA/AIRS RADIANCES CHANNEL 110 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.2021, expected range: -0.1245 0.1329
Atmospheric Motion Vector
All AQUA/MODIS CLOUDY WV WIND VECTOR DIFF (M/S) ALL LAYERS Missing
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (4 pressure layers affected) : out of range
Severe: obs_number=283.0000, expected range: 177.5490 194.7844
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
Severe: rms_fgdepar=2.1677, expected range: 0.5722 1.4665
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (4 pressure layers affected : out of range
Severe: obs_number=283.0000, expected range: 177.5490 194.7844
synop
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
Severe: obs_number=560.0000, expected range: 661.6831 714.4280
BUFR LAND SYNOP RH2M (%) : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=130.0000, expected range: 155.4646 252.0649