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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-11-11 12:00

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 6 : out of range
Considerable: avg_biascorr=-0.0517, expected range: -0.0909 -0.0623
iasi
METOP-B/IASI RADIANCES CHANNEL 5988 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4929, expected range: 0.1740 0.3856
METOP-B/IASI RADIANCES CHANNEL 5992 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5212, expected range: 0.1831 0.3781
METOP-B/IASI RADIANCES CHANNEL 5994 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5508, expected range: 0.1853 0.3970
METOP-B/IASI RADIANCES CHANNEL 83 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1207, expected range: 0.1017 0.3634
METOP-B/IASI RADIANCES CHANNEL 89 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.2444, expected range: 0.2995 0.4815
METOP-B/IASI RADIANCES CHANNEL 187 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0947, expected range: 0.1668 0.4144
METOP-B/IASI RADIANCES (16 channels affected) : out of range
Considerable: stdev_fgdepar=0.8968, expected range: 0.4129 0.7807
airs
AQUA/AIRS RADIANCES CHANNEL 77 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7668, expected range: 0.4004 0.6326
AQUA/AIRS RADIANCES CHANNEL 78 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7013, expected range: 0.4377 0.5856
AQUA/AIRS RADIANCES CHANNEL 2084 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.6778, expected range: 0.1242 0.4711
AQUA/AIRS RADIANCES CHANNEL 2085 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7590, expected range: 0.1741 0.5602
Atmospheric Motion Vector
METEOSAT-11/AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
Slight: avg_fgdepar=4.5560, expected range: 3.5160 4.4163
GOES-16/AMV CLOUDY WV3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 ( : out of range
Slight: avg_fgdepar=4.1052, expected range: 2.3463 3.8516
Radiosondes
LAND TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : missing
Severe: obs_number=0.0000, expected range: 0.0000 356.2801
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
Severe: obs_number=444.0000, expected range: 332.6157 370.3843
HIGH RESO LAND TEMP TEMPERATURE (K) (3 pressure layers affected) : out of range
Severe: obs_number=402.0000, expected range: 470.4386 504.6864
HIGH RESO SEA TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : out of range
3 times in the last 10 days for at least one item
Slight: rms_fgdepar=0.0159, expected range: 0.0000 0.0136
HIGH RESO SEA TEMP Q (G/KG) PRESSURE LAYER 300-600 (HPA) : out of range
Slight: avg_fgdepar=0.1494, expected range: -0.0723 0.1269
prof
EUROPEAN WIND PROFILER VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : missing
1 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 787.8069
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
8 times in the last 10 days for at least one item
Severely_persistent: obs_number=209.0000, expected range: 268.2171 339.9079