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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-16 12:00

iasi
METOP-A/IASI RADIANCES CHANNEL 5399 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4220, expected range: 0.2426 0.3319
METOP-B/IASI RADIANCES CHANNEL 178 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1652, expected range: 0.0187 0.1108
METOP-C/IASI RADIANCES CHANNEL 242 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2027, expected range: 0.1368 0.1793
METOP-C/IASI RADIANCES CHANNEL 97 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1559, expected range: -0.0362 0.0824
cris
NPP/CRIS RADIANCES CHANNEL 622 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.3018, expected range: 0.0376 0.1599
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
48 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=3.9257, expected range: -0.3076 0.3155
Severely_persistent: stdev_fgdepar=2.6590, expected range: 0.0709 0.3529
NPP/CRIS RADIANCES (171 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=16702.0000, expected range: 7460.5639 8057.7195
mhs
ALLSKY METOP-A/MHS RADIANCES CHANNEL 3 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_norm_fgdepar=0.5706, expected range: 0.2447 0.4650
ALLSKY METOP-A/MHS RADIANCES CHANNEL 4 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_norm_fgdepar=0.5269, expected range: 0.1928 0.4352
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: obs_number=63427.0000, expected range: 9423.7679 17633.8485
GOES-15/IMAGER RADIANCES CHANNEL 3 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: obs_number=17307.0000, expected range: 1847.8503 7751.7286
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (4 pressure layers affected) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=96.0000, expected range: 182.3903 197.1653
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
Considerable: avg_biascorr=0.5237, expected range: 0.1474 0.3818
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: obs_number=892.0000, expected range: 1137.0209 1297.8026
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: rms_fgdepar=98.6082, expected range: 42.1895 72.6094
Severely_persistent: obs_number=64.0000, expected range: 65.0000 65.0000
BUFR LAND SYNOP RH2M (%) : out of range
Severe: obs_number=63.0000, expected range: 64.0000 64.0000
buoy
MOORED BUOYS SURFACE PRESSURE (PA) : out of range
11 times in the last 10 days for at least one item
Severely_persistent: obs_number=35.0000, expected range: 50.6024 70.2671