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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-15 00:00

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 8 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=1.9875, expected range: 2.4475 3.1901
METOP-B/AMSUA RADIANCES CHANNEL 9 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0880, expected range: 0.0305 0.0660
METOP-C/AMSUA RADIANCES CHANNEL 7 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.1904, expected range: 0.1325 0.1461
iasi
METOP-A/IASI RADIANCES CHANNEL 5399 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4312, expected range: 0.2426 0.3319
cris
NPP/CRIS RADIANCES CHANNEL 622 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.3203, expected range: 0.0046 0.1599
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
40 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=2.0882, expected range: -0.3076 0.3155
Severely_persistent: stdev_fgdepar=2.5574, expected range: 0.0709 0.3529
NPP/CRIS RADIANCES CHANNEL 1181 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.5535, expected range: -0.1603 0.1687
NPP/CRIS RADIANCES (98 channels affected) : out of range
Severe: obs_number=17285.0000, expected range: 7629.9449 8057.7195
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
Severe: avg_biascorr=0.0001, expected range: 0.0000 0.0000
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=584.0000, expected range: 635.1474 667.1860
LAND TEMP TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=186.0000, expected range: 15.8082 123.4418
LAND TEMP Q (G/KG) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=182.0000, expected range: 15.8082 123.4418
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
3 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=4.7957, expected range: -1.3822 1.4540
Slight: obs_number=1038.0000, expected range: 1072.8968 1419.1032
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
10 times in the last 10 days for at least one item
Severely_persistent: obs_number=86.0000, expected range: 96.6875 99.1875
Severely_persistent: obs_number=88.0000, expected range: 50.3089 65.3578
AUTOMATIC LAND SYNOP RH2M (%) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=265.0000, expected range: 323.7224 345.8332
buoy
MOORED BUOYS SURFACE PRESSURE (PA) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: obs_number=48.0000, expected range: 56.2961 65.1761
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=5.4455, expected range: 0.0000 0.0000
Considerable: rms_fgdepar=68.2635, expected range: 13.5345 45.6164