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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-01-18 18:00

amsua
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1991, expected range: 0.2350 0.2506
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3251, expected range: -0.2883 -0.2834
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 3929.95 7111.16
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES (5 channels affected) : out of range
7 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0452, expected range: 0.7575 0.8872
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 2 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-3.2391, expected range: -1.9393 -1.0851
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 3 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0174, expected range: 0.4791 0.9323
Severely_persistent: stdev_norm_fgdepar=0.0168, expected range: 0.5130 0.8980
Atmospheric Motion Vector
HIMAWARI-8 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
29 times in the last 10 days for at least one item
Severely_persistent: obs_number=136.0000, expected range: 521.2595 673.3647
All METEOSAT-11 AMV IR3 ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 329.13 1776.05
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 135417.71
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 410-411 (HPA) : out of range
23 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.7376, expected range: 0.2141 0.4652
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1-2 (HPA) : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0177, expected range: -0.0305 -0.0244