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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-07-15 00:00

amsua
METOP-C AMSUA RADIANCES (10 channels affected) : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=1821.0000, expected range: 2086.4417 3123.6795
iasi
METOP-B IASI RADIANCES (18 channels affected) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3231, expected range: -0.2575 -0.2302
METOP-A IASI RADIANCES (16 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.3854, expected range: -0.3081 -0.2550
METOP-C IASI RADIANCES (18 channels affected) : out of range
3 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.3944, expected range: -0.3614 -0.3156
cris
NOAA20 CRIS RADIANCES CHANNEL 60 : out of range
32 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1401, expected range: 0.1651 0.1671
NOAA20 CRIS RADIANCES CHANNEL 61 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1366, expected range: 0.1506 0.1616
NOAA20 CRIS RADIANCES CHANNEL 65 : out of range
40 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1059, expected range: 0.1301 0.1532
NOAA20 CRIS RADIANCES CHANNEL 66 : out of range
32 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1066, expected range: 0.1227 0.1409
NOAA20 CRIS RADIANCES CHANNEL 68 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1096, expected range: 0.1318 0.1368
NOAA20 CRIS RADIANCES CHANNEL 71 : out of range
23 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0376, expected range: 0.0534 0.0701
airs
AQUA AIRS RADIANCES CHANNEL 52 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3277, expected range: -0.2612 -0.2015
AQUA AIRS RADIANCES CHANNEL 72 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1985, expected range: -0.1205 -0.0886
mhs
NOAA-19 MHS ALLSKY RADIANCES CHANNEL 5 : out of range
1 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.9769, expected range: 0.3511 0.6214
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1-2 (HPA) : out of range
61 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.0037, expected range: 0.0063 0.0064