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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-12-04 12:00

amsua
NOAA 15 AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6551, expected range: 0.5558 0.5874
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6578, expected range: 0.5564 0.5903
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6669, expected range: 0.5853 0.5871
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6276, expected range: 0.5058 0.5504
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 12 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6964, expected range: 0.6103 0.6492
iasi
METOP-C IASI RADIANCES (60 channels affected) : out of range
Considerable: obs_number=2509.0000, expected range: 2090.8456 2415.6250
mhs
METOP-B MHS ALLSKY RADIANCES CHANNEL 5 : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=6161.0000, expected range: 6595.8093 7539.6132
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 6 : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=1009.0000, expected range: 1689.4068 3709.2188
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 5 : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=1009.0000, expected range: 1689.4568 3709.2188
gpsro
All COSMIC2-E1 GPSRO RISING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 1484.23 2741.77
Atmospheric Motion Vector
METOP-C AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=640.0000, expected range: 339.9838 512.6829
Geostationary CSR
All GOES-16 ABI ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 62637.66 80289.45
All GOES-17 GEOS RADIANCES ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 18492.01 146694.98
amdar
ADS-C TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : missing
5 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 0.0000 300.9320