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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Ensemble Data Assimilation at 2021-05-18 00:00

iasi
METOP-B IASI RADIANCES CHANNEL 191 : out of range
Considerable: avg_fgdepar=-0.0607, expected range: -0.0136 0.0751
METOP-C IASI RADIANCES (61 channels affected) : out of range
Considerable: obs_number=2383.0000, expected range: 2031.3916 2292.7334
atms
NOAA20 ATMS RADIANCES (15 channels affected) : out of range
Severe: obs_number=12487.0000, expected range: 21324.1073 24440.2677
NPP ATMS RADIANCES (15 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=14283.0000, expected range: 21000.4712 24399.1538
NOAA20 ATMS RADIANCES CHANNEL 22 : out of range
Considerable: stdev_fgdepar=1.5668, expected range: 1.1569 1.3963
gpsro
COSMIC2-E5 GPSRO SETTING (7 impact heights affected) : out of range
Considerable: obs_number=404.0000, expected range: 568.8550 891.6450
METOP-A GRAS SETTING HEIGHT 34-36 KM : out of range
Slight: stdev_norm_fgdepar=1.2249, expected range: 0.7860 1.1141
COSMIC2-E4 GPSRO SETTING HEIGHT 48-50 KM : out of range
Slight: stdev_norm_fgdepar=0.6875, expected range: 0.4232 0.6052
Atmospheric Motion Vector
All AQUA MODIS CLEAR WV ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 239.93 1038.14
GOES-16 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
Considerable: obs_number=2856.0000, expected range: 4336.0024 6608.2476
GOES-17 AMV CLOUDY WV3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HP : out of range
Considerable: obs_number=2842.0000, expected range: 4628.0298 8182.2202
Geostationary CSR
GOES-16 ABI RADIANCES CHANNEL 2 : out of range
Considerable: obs_number=39992.0000, expected range: 68386.5541 108966.6959
GOES-16 ABI RADIANCES CHANNEL 3 : out of range
Considerable: obs_number=40062.0000, expected range: 68441.7633 109006.2367
GOES-16 ABI RADIANCES CHANNEL 4 : out of range
Considerable: obs_number=40289.0000, expected range: 68568.9434 109202.1816