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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-12-29 00:00

amsua
METOP-B AMSUA RADIANCES (10 channels affected) : out of range
Considerable: obs_number=4917.0000, expected range: 9219.5495 16518.0755
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 14503.34 24241.14
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=0.3001, expected range: -0.0244 0.0288
Severely_persistent: stdev_norm_fgdepar=0.7913, expected range: 0.1495 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=0.4370, expected range: -0.0426 0.0464
Severely_persistent: stdev_norm_fgdepar=0.4435, expected range: 0.0536 0.1765
gpsro
METOP-A GRAS RISING HEIGHT 36-38 KM : out of range
Slight: stdev_norm_fgdepar=0.9897, expected range: 0.6184 0.9058
COSMIC2-E1 GPSRO SETTING HEIGHT 44-46 KM : out of range
Slight: avg_norm_fgdepar=0.1471, expected range: -0.1059 0.0902
COSMIC2-E4 GPSRO RISING HEIGHT 10-12 KM : out of range
Slight: stdev_norm_fgdepar=0.7860, expected range: 0.8674 1.1429
Geostationary CSR
HIMAWARI-8 AHI RADIANCES CHANNEL 2 : out of range
Considerable: obs_number=10596.0000, expected range: 11971.7506 15094.3744
HIMAWARI-8 AHI RADIANCES CHANNEL 3 : out of range
Considerable: obs_number=10123.0000, expected range: 11236.9471 14734.5529
HIMAWARI-8 AHI RADIANCES CHANNEL 4 : out of range
Considerable: obs_number=9738.0000, expected range: 10925.2536 14192.8714