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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-01-16 00:00

amsua
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3257, expected range: -0.2883 -0.2728
iasi
METOP-B IASI RADIANCES CHANNEL 3168 : out of range
Slight: stdev_fgdepar=0.6801, expected range: 0.4251 0.6154
mhs
NOAA-19 MHS ALLSKY RADIANCES CHANNEL 5 : out of range
Considerable: obs_number=1874.0000, expected range: 2644.4645 5684.1375
mwhs2
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 4 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.6520, expected range: -3.6657 -2.8594
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 4 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.9233, expected range: 0.6111 0.7192
Severely_persistent: avg_biascorr=-3.5436, expected range: -2.7387 -2.1202
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 5 : out of range
23 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.9456, expected range: 0.5990 0.7721
Severely_persistent: avg_biascorr=-1.9945, expected range: -0.4184 0.1275
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 6 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2389, expected range: 1.6101 2.2290
Severely_persistent: stdev_norm_fgdepar=0.9516, expected range: 0.5759 0.7259
Slight: stdev_norm_fgdepar=0.9521, expected range: 0.5321 0.8548
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 2 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.9411, expected range: 0.7707 0.8642
Severely_persistent: avg_biascorr=-2.6131, expected range: -1.9393 -1.0851
Slight: stdev_norm_fgdepar=0.9476, expected range: 0.7575 0.8872
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 3 : out of range
4 times in the last 10 days for at least one item
Considerable: stdev_norm_fgdepar=1.1788, expected range: 0.5130 0.8980
atms
NPP ATMS RADIANCES CHANNEL 12 : out of range
2 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.2444, expected range: 0.2109 0.2350
NPP ATMS RADIANCES CHANNEL 14 : out of range
8 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.5297, expected range: 0.4320 0.4996
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
2 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.2142, expected range: 0.1742 0.2083
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
17 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.3182, expected range: 0.2624 0.3034
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
17 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.4723, expected range: 0.3840 0.4613
Atmospheric Motion Vector
METEOSAT-11 AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Slight: stdev_press=33.3884, expected range: 36.4897 42.6449
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 410-411 (HPA) : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.8256, expected range: 0.0686 0.4652
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1-2 (HPA) : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0188, expected range: -0.0316 -0.0244