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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-09 00:00

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 9 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0914, expected range: 0.1061 0.1344
NOAA-15/AMSUA RADIANCES CHANNEL 5 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0790, expected range: 0.1007 0.1589
NOAA-19/AMSUA RADIANCES (7 channels affected) : out of range
Considerable: obs_number=6521.0000, expected range: 6894.4778 8038.0777
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=0.1205, expected range: 0.0516 0.0963
METOP-C/IASI RADIANCES CHANNEL 2245 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1782, expected range: 0.2143 0.2416
METOP-A/IASI RADIANCES CHANNEL 241 : out of range
Severe: stdev_fgdepar=0.2678, expected range: 0.2808 0.2808
METOP-A/IASI RADIANCES CHANNEL 318 : out of range
Severe: stdev_fgdepar=0.2353, expected range: 0.2493 0.2737
METOP-A/IASI RADIANCES (391 channels affected) : out of range
Slight: obs_number=19412.0000, expected range: 20393.4447 22415.4201
METOP-A/IASI RADIANCES (25 channels affected) : out of range
Slight: avg_fgdepar=0.0435, expected range: -0.0048 0.0359
METOP-A/IASI RADIANCES CHANNEL 1658 : out of range
Slight: stdev_fgdepar=0.5218, expected range: 0.3708 0.5002
cris
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.3844, expected range: -0.1544 0.1642
NPP/CRIS RADIANCES CHANNEL 1189 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.3295, expected range: -0.0729 0.1188
NPP/CRIS RADIANCES (12 channels affected) : out of range
16 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=3.3498, expected range: 0.1626 0.2918
NPP/CRIS RADIANCES (227 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0688, expected range: 0.1381 0.2012
NPP/CRIS RADIANCES CHANNEL 622 : out of range
7 times in the last 10 days for at least one item
Slight: avg_fgdepar=0.2082, expected range: -0.1319 0.0501
NOAA20/CRIS RADIANCES (49 channels affected) : out of range
3 times in the last 10 days for at least one item
Slight: obs_number=22708.0000, expected range: 22918.3788 23367.3435
mhs
ALLSKY NOAA-19/MHS RADIANCES CHANNEL 3 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=12974.0000, expected range: 13908.5113 15699.7665
ALLSKY NOAA-19/MHS RADIANCES CHANNEL 4 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=14240.0000, expected range: 15045.8452 17108.0437
Radiosondes
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HP : out of range
Severe: rms_fgdepar=5.3828, expected range: 0.0000 8.2775
LAND TEMP TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=556.0000, expected range: 201.0015 474.2207
amdar
All WIGOS AMDAR Q (G/KG) ALL LAYERS Missing
synop
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
Considerable: avg_biascorr=1.3772, expected range: 5.0504 11.8579