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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-05-08 00:00

amsua
METOP-C AMSUA RADIANCES (10 channels affected) : out of range
Considerable: obs_number=6257.0000, expected range: 10626.0911 25245.5339
iasi
METOP-A IASI RADIANCES (11 channels affected) : out of range
Severe: avg_biascorr=-0.0340, expected range: -0.0053 -0.0036
METOP-B IASI RADIANCES (13 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.1171, expected range: -0.1023 -0.0892
METOP-B IASI RADIANCES CHANNEL 571 : out of range
Considerable: stdev_fgdepar=0.3849, expected range: 0.3051 0.3545
cris
NPP CRIS RADIANCES CHANNEL 94 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0856, expected range: 0.1096 0.1155
NPP CRIS RADIANCES CHANNEL 120 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0842, expected range: -0.0725 -0.0675
NPP CRIS RADIANCES CHANNEL 123 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0675, expected range: -0.0591 -0.0503
NPP CRIS RADIANCES CHANNEL 126 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0964, expected range: -0.0857 -0.0835
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0380, expected range: 0.0499 0.0549
Severely_persistent: avg_biascorr=-0.0538, expected range: -0.0491 -0.0456
NOAA20 CRIS RADIANCES CHANNEL 88 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0333, expected range: 0.0456 0.0562
NOAA20 CRIS RADIANCES CHANNEL 92 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1520, expected range: 0.1752 0.1761
NOAA20 CRIS RADIANCES CHANNEL 93 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1390, expected range: 0.1602 0.1633
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0223, expected range: 0.0375 0.0447
NOAA20 CRIS RADIANCES CHANNEL 122 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0249, expected range: -0.0148 -0.0039
NPP CRIS RADIANCES (16 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0913, expected range: -0.0794 -0.0755
airs
AQUA AIRS RADIANCES CHANNEL 232 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7809, expected range: -0.7141 -0.6726
AQUA AIRS RADIANCES (38 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=872.0000, expected range: 915.0100 1069.0222
gpsro
KOMPSAT-5 GPSRO RISING HEIGHT 38-40 KM : out of range
Considerable: stdev_norm_fgdepar=1.2461, expected range: 0.5054 0.9316
Atmospheric Motion Vector
METEOSAT-8 AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HPA : out of range
Slight: stdev_press=19.3711, expected range: 23.0227 29.5521