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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-01-13 18:00

amsua
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3280, expected range: -0.2883 -0.2699
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.4330, expected range: -0.4100 -0.3731
airs
AQUA AIRS RADIANCES CHANNEL 305 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.9276, expected range: 0.2992 0.4466
mwhs2
All FY-3C MWHS2 ALLSKY ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 24426.40
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 12 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-2.0207, expected range: -2.3383 -2.2277
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 5 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-2.8460, expected range: -0.6777 -0.5906
FY-3D MWHS2 ALLSKY RADIANCES (5 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_norm_fgdepar=-0.3703, expected range: -0.1097 0.1066
Severe: stdev_norm_fgdepar=1.0093, expected range: 0.7912 0.8454
Considerable: obs_number=402.0000, expected range: 837.2607 2305.7560
FY-3D MWHS2 ALLSKY RADIANCES (6 channels affected) : out of range
Severe: avg_biascorr=-4.3480, expected range: -1.7386 -0.8185
atms
NPP ATMS RADIANCES CHANNEL 10 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1284, expected range: -0.2490 -0.2448
NOAA20 ATMS RADIANCES CHANNEL 22 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.7499, expected range: 0.8085 0.8580
NOAA20 ATMS RADIANCES CHANNEL 9 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5339, expected range: -0.6850 -0.6841
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 12 : out of range
Considerable: obs_number=1695.0000, expected range: 2598.3599 4026.1401
DMSP-17 SSMIS RADIANCES CHANNEL 13 : out of range
Considerable: obs_number=1700.0000, expected range: 2601.8140 4035.0749
DMSP-17 SSMIS RADIANCES CHANNEL 14 : out of range
Considerable: obs_number=1697.0000, expected range: 2590.0300 4028.1367
DMSP-17 SSMIS RADIANCES CHANNEL 16 : out of range
Considerable: obs_number=1695.0000, expected range: 2591.0462 4016.8983
Atmospheric Motion Vector
HIMAWARI-8 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
28 times in the last 10 days for at least one item
Severely_persistent: obs_number=195.0000, expected range: 521.2595 675.8043
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 128849.64
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 410-411 (HPA) : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.8882, expected range: -0.0205 0.4652
METOP-B GOME-2 OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.4394, expected range: -1.7446 -1.7110