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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-10-21 12:00

amsua
NOAA 15 AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.7612, expected range: 0.5384 0.6337
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_norm_fgdepar=0.8004, expected range: 0.5179 0.6821
NOAA 19 AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_norm_fgdepar=0.7134, expected range: 0.5394 0.6552
METOP-A AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
Considerable: stdev_norm_fgdepar=0.7658, expected range: 0.5045 0.6748
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_norm_fgdepar=0.7317, expected range: 0.4763 0.6399
iasi
METOP-C IASI RADIANCES CHANNEL 119 : out of range
1 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.3075, expected range: 0.2599 0.2739
METOP-C IASI RADIANCES CHANNEL 125 : out of range
1 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.3126, expected range: 0.2499 0.2770
METOP-B IASI RADIANCES (15 channels affected) : out of range
Considerable: obs_number=1956.0000, expected range: 1489.8330 1858.5670
METOP-C IASI RADIANCES CHANNEL 138 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.3074, expected range: 0.2289 0.2797
METOP-C IASI RADIANCES CHANNEL 157 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.2964, expected range: 0.2310 0.2695
cris
NOAA20 CRIS RADIANCES (26 channels affected) : out of range
Considerable: obs_number=10461.0000, expected range: 9088.1797 9886.2203
atms
NOAA20 ATMS RADIANCES CHANNEL 19 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1372, expected range: -0.1644 -0.1489
NOAA20 ATMS RADIANCES CHANNEL 20 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0065, expected range: -0.1058 -0.0601
gpsro
COSMIC2-E4 GPSRO SETTING HEIGHT 6-8 KM : out of range
Considerable: avg_norm_fgdepar=0.1035, expected range: -0.1525 0.0120