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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-06-26 00:00

amsua
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 8 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0965, expected range: -0.1145 -0.1043
NOAA 15 AMSUA ALL SKY RADIANCES CHANNEL 12 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.2462, expected range: -0.2125 -0.1534
iasi
METOP-B IASI RADIANCES CHANNEL 5480 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4002, expected range: -0.3581 -0.3071
METOP-B IASI RADIANCES CHANNEL 303 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2718, expected range: 0.2330 0.2522
METOP-B IASI RADIANCES CHANNEL 101 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2272, expected range: 0.2674 0.3057
METOP-B IASI RADIANCES CHANNEL 106 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2565, expected range: 0.2886 0.3231
METOP-B IASI RADIANCES CHANNEL 163 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2658, expected range: 0.2999 0.3165
METOP-B IASI RADIANCES CHANNEL 170 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2004, expected range: 0.2404 0.2491
METOP-C IASI RADIANCES CHANNEL 303 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2498, expected range: 0.2152 0.2343
airs
AQUA AIRS RADIANCES CHANNEL 22 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0438, expected range: 0.0008 0.0414
gpsro
COSMIC2-E5 GPSRO SETTING (24 impact heights affected) : out of range
1 times in the last 10 days for at least one item
Slight: obs_number=243.0000, expected range: 1540.6694 2924.7056
COSMIC2-E5 GPSRO SETTING HEIGHT 6-8 KM : out of range
Slight: stdev_norm_fgdepar=0.6879, expected range: 0.7799 1.0044
amdar
TAMDAR TEMPERATURE (K) PRESSURE LAYER 900-1200 (HPA) : missing
Severe: obs_number=0.0000, expected range: 0.0000 283.6265