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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-09-14 00:00

amsua
AQUA/AMSUA RADIANCES CHANNEL 10 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1279, expected range: 0.1702 0.2489
AQUA/AMSUA RADIANCES CHANNEL 11 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1824, expected range: 0.2386 0.3225
METOP-B/AMSUA RADIANCES CHANNEL 10 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3878, expected range: 0.4291 0.5084
METOP-C/AMSUA RADIANCES CHANNEL 11 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1048, expected range: -0.0058 0.1078
Severely_persistent: avg_biascorr=-0.2048, expected range: -0.0730 0.1887
iasi
METOP-A/IASI RADIANCES CHANNEL 125 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1651, expected range: 0.1987 0.2649
METOP-A/IASI RADIANCES CHANNEL 131 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2317, expected range: 0.2801 0.3470
METOP-A/IASI RADIANCES CHANNEL 195 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2847, expected range: 0.3262 0.3938
METOP-B/IASI RADIANCES CHANNEL 59 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.5672, expected range: 0.6066 0.6751
METOP-B/IASI RADIANCES CHANNEL 195 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4443, expected range: 0.4794 0.5363
METOP-B/IASI RADIANCES CHANNEL 6458 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=1.9013, expected range: 3.1175 5.5201
METOP-C/IASI RADIANCES CHANNEL 59 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.5272, expected range: 0.5655 0.6357
METOP-C/IASI RADIANCES CHANNEL 6458 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=1.8844, expected range: 3.3805 5.2626
METOP-C/IASI RADIANCES CHANNEL 6601 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=1.8373, expected range: 3.1635 5.6839
METOP-B/IASI RADIANCES (48 channels affected) : out of range
Severe: avg_biascorr=0.7536, expected range: -0.1278 0.3851
METOP-C/IASI RADIANCES (55 channels affected) : out of range
Severe: avg_biascorr=0.7616, expected range: -0.1962 0.3561
cris
NPP/CRIS RADIANCES (197 channels affected) : out of range
Severe: obs_number=22333.0000, expected range: 120379.8255 128558.3563
NPP/CRIS RADIANCES CHANNEL 1181 : out of range
2 times in the last 10 days for at least one item
Severe: stdev_fgdepar=5.0895, expected range: 3.3250 4.4966
airs
AQUA/AIRS RADIANCES CHANNEL 72 : out of range
4 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.5366, expected range: 0.6431 1.0257
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 4 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0099, expected range: 0.0122 0.0136
DMSP-18/SSMIS RADIANCES CHANNEL 5 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0099, expected range: 0.0121 0.0136
Atmospheric Motion Vector
METEOSAT-8/AMV CLOUDY WV1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
Considerable: obs_number=758.0000, expected range: 0.0000 548.2150
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: obs_number=3453.0000, expected range: 6082.6680 6617.2039
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (3 pressure layers affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.3485, expected range: 0.0000 0.0000
Severe: obs_number=104.0000, expected range: 256.3522 304.1184
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=65.0000, expected range: 182.5755 204.0128
pilot
All LAND PILOT WIND VECTOR DIFF (M/S) ALL LAYERS North pole : all data missing
Severe: obs_number=0, expected range: 0.00 156.38
ship
BUFR SHIP SYNOP WIND VECTOR DIFF (M/S) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=431.0000, expected range: 557.6692 811.9975
BUFR SHIP SYNOP SURFACE PRESSURE (PA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=904.0000, expected range: 1069.0349 1299.1873
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=4.1438, expected range: 0.0000 0.0000