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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-12-30 00:00

amsua
NOAA-15 AMSUA RADIANCES CHANNEL 12 : out of range
Severe: stdev_fgdepar=0.4886, expected range: 0.2932 0.3950
NOAA-19 AMSUA RADIANCES CHANNEL 11 : out of range
Severe: stdev_fgdepar=0.3684, expected range: 0.2009 0.2805
METOP-A AMSUA RADIANCES CHANNEL 11 : out of range
Severe: stdev_fgdepar=0.3929, expected range: 0.2291 0.3095
METOP-A AMSUA RADIANCES CHANNEL 12 : out of range
Severe: stdev_fgdepar=0.5425, expected range: 0.3279 0.4455
METOP-C AMSUA RADIANCES CHANNEL 11 : out of range
Severe: stdev_fgdepar=0.3730, expected range: 0.1767 0.2806
METOP-C AMSUA RADIANCES CHANNEL 12 : out of range
Severe: stdev_fgdepar=0.5300, expected range: 0.2593 0.4128
NOAA-18 AMSUA RADIANCES CHANNEL 12 : out of range
Considerable: stdev_fgdepar=0.5178, expected range: 0.3397 0.4469
METOP-A AMSUA RADIANCES CHANNEL 10 : out of range
Considerable: stdev_fgdepar=0.2538, expected range: 0.2038 0.2366
METOP-B AMSUA RADIANCES CHANNEL 11 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.3546, expected range: 0.1875 0.2889
iasi
METOP-B IASI RADIANCES CHANNEL 2991 : out of range
Severe: avg_biascorr=0.2984, expected range: 0.3435 0.4013
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 14329.01 24406.99
mhs
METOP-A MHS ALLSKY RADIANCES CHANNEL 3 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_norm_fgdepar=-0.3274, expected range: -0.0244 0.0288
Severely_persistent: stdev_norm_fgdepar=0.4863, expected range: 0.0274 0.1500
METOP-A MHS ALLSKY RADIANCES CHANNEL 4 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_norm_fgdepar=-0.2783, expected range: -0.0426 0.0464
Severely_persistent: stdev_norm_fgdepar=0.5193, expected range: 0.0161 0.1765
atms
NPP ATMS RADIANCES CHANNEL 12 : out of range
Severe: stdev_fgdepar=0.3186, expected range: 0.1880 0.2555
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
Severe: stdev_fgdepar=0.2978, expected range: 0.1598 0.2222
NPP ATMS RADIANCES CHANNEL 13 : out of range
Considerable: stdev_fgdepar=0.4572, expected range: 0.2746 0.3872
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
Considerable: stdev_fgdepar=0.4407, expected range: 0.2383 0.3575