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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-10-05 12:00

amsua
METOP-C AMSUA ALL SKY RADIANCES (10 channels affected) : out of range
Slight: obs_number=918.0000, expected range: 6823.0716 12790.5284
iasi
METOP-B IASI RADIANCES CHANNEL 70 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3253, expected range: 0.2868 0.2963
METOP-B IASI RADIANCES CHANNEL 79 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3204, expected range: 0.3555 0.3842
METOP-B IASI RADIANCES CHANNEL 59 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3280, expected range: 0.3650 0.3887
METOP-B IASI RADIANCES CHANNEL 151 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2552, expected range: 0.2789 0.3024
METOP-B IASI RADIANCES CHANNEL 386 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0383, expected range: 0.0774 0.1267
METOP-C IASI RADIANCES CHANNEL 16 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.1667, expected range: -0.0733 0.0605
METOP-C IASI RADIANCES CHANNEL 1578 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.3250, expected range: -0.0908 0.1826
METOP-C IASI RADIANCES CHANNEL 386 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0688, expected range: 0.0862 0.1032
METOP-C IASI RADIANCES (220 channels affected) : out of range
Severe: obs_number=964.0000, expected range: 9199.1137 12901.8578
METOP-C IASI RADIANCES CHANNEL 222 : out of range
Considerable: avg_fgdepar=-0.0302, expected range: -0.0117 0.0204
METOP-C IASI RADIANCES CHANNEL 296 : out of range
Considerable: avg_fgdepar=-0.0504, expected range: -0.0200 0.0248
METOP-C IASI RADIANCES CHANNEL 360 : out of range
Slight: stdev_fgdepar=0.2345, expected range: 0.2058 0.2234
METOP-C IASI RADIANCES CHANNEL 366 : out of range
Slight: stdev_fgdepar=0.2269, expected range: 0.2052 0.2191
mhs
METOP-C MHS ALLSKY RADIANCES CHANNEL 3 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=4153.0000, expected range: 21325.5631 26401.6369
METOP-C MHS ALLSKY RADIANCES CHANNEL 4 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=3843.0000, expected range: 20586.0891 25098.3109
METOP-C MHS ALLSKY RADIANCES CHANNEL 5 : out of range
Severe: obs_number=1832.0000, expected range: 12238.6708 16191.4435
gpsro
All TERRASAR-X GPSRO SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 33.48 846.20
SENTINEL 6A GPSRO SETTING (14 impact heights affected) : out of range
Slight: obs_number=719.0000, expected range: 1034.2922 2126.6220
Atmospheric Motion Vector
All GOES-17 AMV CLOUDY WV3 ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 1428.11 4120.49
resat
AURA OMI OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
23 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.6738, expected range: -3.7878 -2.6772
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1010-1011 (HPA) : out of range
28 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.7625, expected range: 1.1810 1.9796
METOP-B GOME-2 OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
26 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6981, expected range: -0.7987 -0.7564