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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-13 00:00

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 8 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=1.1269, expected range: 0.6587 0.8381
Severely_persistent: avg_biascorr=2.0361, expected range: 2.4518 2.9212
iasi
METOP-B/IASI RADIANCES CHANNEL 178 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1557, expected range: 0.0779 0.0963
METOP-C/IASI RADIANCES CHANNEL 178 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1151, expected range: 0.0287 0.0668
METOP-C/IASI RADIANCES CHANNEL 179 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1577, expected range: 0.0809 0.1292
METOP-A/IASI RADIANCES (391 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=118923.0000, expected range: 20393.4447 22415.4201
METOP-A/IASI RADIANCES CHANNEL 369 : out of range
Considerable: stdev_fgdepar=0.2223, expected range: 0.2329 0.2633
cris
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=3.1559, expected range: 0.1517 0.3528
NOAA20/CRIS RADIANCES CHANNEL 33 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1836, expected range: 0.1309 0.1623
NOAA20/CRIS RADIANCES CHANNEL 34 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3242, expected range: 0.2753 0.2922
NPP/CRIS RADIANCES (137 channels affected) : out of range
Severe: obs_number=15375.0000, expected range: 5951.4397 8003.2085
NPP/CRIS RADIANCES (12 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_fgdepar=0.2262, expected range: 0.0490 0.1272
NOAA20/CRIS RADIANCES (34 channels affected) : out of range
Slight: obs_number=22850.0000, expected range: 22918.3788 23367.3435
airs
AQUA/AIRS RADIANCES CHANNEL 10 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.5401, expected range: 0.3779 0.4722
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 6 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: obs_number=1897.0000, expected range: 318.4068 1090.6361
DMSP-18/SSMIS RADIANCES CHANNEL 7 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: obs_number=1908.0000, expected range: 319.2366 1101.9719
DMSP-18/SSMIS RADIANCES CHANNEL 10 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: obs_number=1885.0000, expected range: 313.7337 1079.4379
DMSP-18/SSMIS RADIANCES CHANNEL 11 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: obs_number=1883.0000, expected range: 315.1366 1080.6563
Radiosondes
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (3 pressure layers affected : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=279.0000, expected range: 365.4208 383.2042
amdar
All AMDAR TEMPERATURE (K) ALL LAYERS Missing
All AMDAR WIND VECTOR DIFF (M/S) ALL LAYERS Missing
ship
AUTOMATIC SHIP SURFACE PRESSURE (PA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=4495.0000, expected range: 3913.5241 4249.6982
buoy
MOORED BUOYS WIND VECTOR DIFF (M/S) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=76.0000, expected range: 82.3579 92.5070
gbrad
All GROUND-BASED RADAR WIND VECTOR DIFF (M/S) Missing