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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-09-23 12:00

amsua
METOP-B AMSUA RADIANCES CHANNEL 6 : out of range
Severe: avg_fgdepar=0.1378, expected range: -0.0315 0.0646
METOP-B AMSUA RADIANCES CHANNEL 10 : out of range
Considerable: avg_fgdepar=-0.1220, expected range: -0.0610 0.0461
iasi
METOP-B IASI RADIANCES (220 channels affected) : out of range
Severe: obs_number=1441.0000, expected range: 11177.7375 11443.3482
METOP-B IASI RADIANCES CHANNEL 173 : out of range
Considerable: avg_fgdepar=-0.0464, expected range: -0.0199 0.0268
METOP-B IASI RADIANCES CHANNEL 199 : out of range
Considerable: avg_fgdepar=-0.0349, expected range: -0.0116 0.0291
METOP-B IASI RADIANCES CHANNEL 207 : out of range
Considerable: avg_fgdepar=-0.0348, expected range: -0.0126 0.0255
METOP-B IASI RADIANCES CHANNEL 154 : out of range
Slight: avg_fgdepar=-0.0338, expected range: -0.0222 0.0238
METOP-B IASI RADIANCES CHANNEL 187 : out of range
Slight: avg_fgdepar=-0.0542, expected range: -0.0254 0.0361
METOP-B IASI RADIANCES CHANNEL 234 : out of range
Slight: avg_fgdepar=-0.0287, expected range: -0.0123 0.0287
METOP-B IASI RADIANCES CHANNEL 350 : out of range
Slight: stdev_fgdepar=0.2761, expected range: 0.2176 0.2597
METOP-B IASI RADIANCES CHANNEL 358 : out of range
Slight: stdev_fgdepar=0.2625, expected range: 0.2199 0.2528
METOP-B IASI RADIANCES CHANNEL 362 : out of range
Slight: stdev_fgdepar=0.2610, expected range: 0.2130 0.2502
METOP-B IASI RADIANCES CHANNEL 426 : out of range
Slight: stdev_fgdepar=0.2643, expected range: 0.2143 0.2508
airs
AQUA AIRS RADIANCES CHANNEL 1024 : missing
22 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 1098.7429 3400.4981
mhs
METOP-B MHS ALLSKY RADIANCES CHANNEL 3 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=4890.0000, expected range: 21765.4228 26867.6630
METOP-B MHS ALLSKY RADIANCES CHANNEL 4 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=4540.0000, expected range: 21147.5178 25418.3108
METOP-B MHS ALLSKY RADIANCES CHANNEL 5 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=2036.0000, expected range: 13089.8887 15999.2542
gpsro
All COSMIC2-E5 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 211.12 1275.20
resat
METOP-B GOME-2 OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
Considerable: obs_number=10078.0000, expected range: 16453.9653 38711.8062
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (3 pressure layers affected) : missing
1 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 172.5616 198.6384
Severe: obs_number=0.0000, expected range: 205.9595 929.9048
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : missing
2 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 41.7385 210.2615
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : missing
Severe: obs_number=0.0000, expected range: 9.3334 567.5018
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Severe: obs_number=98.0000, expected range: 62.7560 68.1012
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 26 : all data missing
Severe: obs_number=0, expected range: 84.33 129.27
prof
EUROPEAN WIND PROFILER VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
Considerable: obs_number=2233.0000, expected range: 344.2271 1599.0229
buoy
MOORED BUOYS WIND VECTOR DIFF (M/S) : out of range
Considerable: obs_number=57.0000, expected range: 65.0000 65.0000