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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-05-08 00:00

amsua
NOAA 15 AMSUA ALL SKY RADIANCES CHANNEL 12 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0214, expected range: -0.0523 -0.0426
NOAA 19 AMSUA ALL SKY RADIANCES CHANNEL 9 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0040, expected range: -0.0523 -0.0251
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 7 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4886, expected range: -0.3719 -0.3673
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 8 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2701, expected range: 0.3342 0.3861
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 9 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1678, expected range: -0.0945 -0.0058
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 7 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.0228, expected range: -0.9309 -0.9013
iasi
METOP-B IASI RADIANCES (69 channels affected) : out of range
Considerable: obs_number=2498.0000, expected range: 2128.7164 2314.4601
cris
NOAA20 CRIS RADIANCES CHANNEL 75 : out of range
Slight: avg_fgdepar=0.0000, expected range: 0.0036 0.0158
atms
NPP ATMS RADIANCES CHANNEL 21 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3168, expected range: 0.2778 0.2901
NPP ATMS RADIANCES CHANNEL 11 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1841, expected range: -0.2270 -0.2078
NPP ATMS RADIANCES CHANNEL 13 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1125, expected range: -0.1797 -0.1760
NPP ATMS RADIANCES CHANNEL 14 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1289, expected range: 0.0299 0.0661
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1440, expected range: -0.1710 -0.1637
Atmospheric Motion Vector
METOP-B AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=249.0000, expected range: 125.3802 181.4613
METOP-C AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=231.0000, expected range: 105.1720 176.9659
METEOSAT-8 AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Slight: avg_fgdepar=4.6269, expected range: 3.5203 4.2578
amdar
WIGOS AMDAR Q (G/KG) PRESSURE LAYER 600-900 (HPA) : out of range
Considerable: obs_number=2707.0000, expected range: 4321.7714 6835.2286