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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Early delivery 4D-VAR at 2021-12-05 00:00

amsua
NOAA 19 AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
2 times in the last 10 days for at least one item
Considerable: stdev_norm_fgdepar=0.6873, expected range: 0.4485 0.6048
cris
NOAA20 CRIS RADIANCES CHANNEL 618 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0577, expected range: -0.0998 -0.0864
NOAA20 CRIS RADIANCES CHANNEL 598 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0815, expected range: -0.1501 -0.1228
NOAA20 CRIS RADIANCES CHANNEL 602 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1205, expected range: -0.1844 -0.1508
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 5 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0055, expected range: 0.0026 0.0040
DMSP-18 SSMIS RADIANCES CHANNEL 5 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0032, expected range: 0.0104 0.0153
DMSP-18 SSMIS RADIANCES CHANNEL 4 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0007, expected range: 0.0104 0.0155
gpsro
All COSMIC2-E1 GPSRO RISING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 574.79 1560.90
Atmospheric Motion Vector
HIMAWARI-8 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=408.0000, expected range: 821.9174 1403.7827
Geostationary CSR
All GOES-16 ABI ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 29736.18 41897.82
All GOES-17 GEOS RADIANCES ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 10554.87 75932.27
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 137063.26
amdar
AMDAR WIND VECTOR DIFF (M/S) (2 pressure layers affected) : out of range
Severe: rms_fgdepar=14.3127, expected range: 0.4749 5.1363
Severe: rms_fgdepar=13.7301, expected range: 1.5594 5.0783
Severe: rms_fgdepar=9.4625, expected range: 0.7433 5.5844