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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-14 06:00

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 8 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=2.0470, expected range: 2.4475 3.1280
METOP-C/AMSUA RADIANCES CHANNEL 7 : out of range
Severe: stdev_fgdepar=0.2794, expected range: 0.1325 0.1461
Slight: avg_fgdepar=0.0195, expected range: -0.0099 0.0092
NOAA-19/AMSUA RADIANCES CHANNEL 9 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0392, expected range: 0.0569 0.1228
iasi
METOP-A/IASI RADIANCES CHANNEL 5399 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4087, expected range: 0.2426 0.3319
METOP-B/IASI RADIANCES CHANNEL 178 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0822, expected range: 0.0377 0.0511
METOP-B/IASI RADIANCES CHANNEL 386 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4593, expected range: -0.4783 -0.4783
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=0.2125, expected range: -0.0009 0.1599
NPP/CRIS RADIANCES CHANNEL 1157 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=1.1577, expected range: -0.2954 0.3049
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=3.5721, expected range: 0.0709 0.3529
NPP/CRIS RADIANCES (46 channels affected) : out of range
Severe: obs_number=13980.0000, expected range: 7448.4913 8057.7195
NOAA20/CRIS RADIANCES (13 channels affected) : out of range
Considerable: avg_biascorr=0.2140, expected range: 0.1800 0.2052
saphir
ALLSKY SAPHIR RADIANCES CHANNEL 1 : out of range
Considerable: obs_number=984.0000, expected range: 295.6238 788.5698
ALLSKY SAPHIR RADIANCES CHANNEL 2 : out of range
Considerable: obs_number=979.0000, expected range: 299.6098 774.3902
ALLSKY SAPHIR RADIANCES CHANNEL 3 : out of range
Considerable: obs_number=972.0000, expected range: 275.1255 770.4228
ALLSKY SAPHIR RADIANCES CHANNEL 4 : out of range
Considerable: obs_number=948.0000, expected range: 239.9420 768.8644
Atmospheric Motion Vector
GOES-16/AMV VIS1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.2292, expected range: 1.0286 1.7287
Severely_persistent: stdev_press=0.0000, expected range: 26.8495 63.2433
Severely_persistent: stdev_fgdepar=0.0000, expected range: 0.4995 1.2535
METEOSAT-8/AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-60 : out of range
Considerable: stdev_fgdepar=3.1058, expected range: 1.5466 2.7058
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
Considerable: stdev_fgdepar=0.7017, expected range: 0.4214 0.6264
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: rms_fgdepar=0.8091, expected range: 0.0220 0.4868
synop
MANUAL LAND SYNOP SURFACE PRESSURE (PA) : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=13.2692, expected range: -1.5242 6.4088
ship
AUTOMATIC SHIP SURFACE PRESSURE (PA) : out of range
5 times in the last 10 days for at least one item
Slight: obs_number=2013.0000, expected range: 1742.7236 1942.8027