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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-05-11 12:00

iasi
METOP-A IASI RADIANCES (13 channels affected) : out of range
Severe: avg_biascorr=-0.0368, expected range: -0.0053 0.0027
METOP-B IASI RADIANCES (12 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0124, expected range: 0.0450 0.0483
METOP-B IASI RADIANCES CHANNEL 254 : out of range
Considerable: avg_biascorr=-0.1120, expected range: -0.1044 -0.0924
cris
NPP CRIS RADIANCES CHANNEL 95 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1147, expected range: 0.1271 0.1422
NPP CRIS RADIANCES CHANNEL 120 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0899, expected range: -0.0725 -0.0640
NPP CRIS RADIANCES CHANNEL 123 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0700, expected range: -0.0591 -0.0492
NPP CRIS RADIANCES CHANNEL 126 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1001, expected range: -0.0857 -0.0831
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0359, expected range: 0.0499 0.0525
Severely_persistent: avg_biascorr=-0.0581, expected range: -0.0491 -0.0457
NOAA20 CRIS RADIANCES CHANNEL 94 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1614, expected range: 0.1743 0.1847
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0138, expected range: 0.0375 0.0495
NOAA20 CRIS RADIANCES CHANNEL 122 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0331, expected range: -0.0148 0.0009
airs
AQUA AIRS RADIANCES CHANNEL 201 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3277, expected range: -0.2997 -0.2858
AQUA AIRS RADIANCES CHANNEL 1865 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0261, expected range: -0.0738 -0.0475
AQUA AIRS RADIANCES CHANNEL 1869 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0475, expected range: -0.0975 -0.0792
AQUA AIRS RADIANCES CHANNEL 232 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.8127, expected range: -0.7141 -0.7046
AQUA AIRS RADIANCES CHANNEL 256 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6429, expected range: -0.5895 -0.5370
AQUA AIRS RADIANCES (43 channels affected) : out of range
Slight: obs_number=2314.0000, expected range: 2401.4529 2672.2849
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 10 : out of range
Considerable: obs_number=22494.0000, expected range: 27347.5095 36378.3729
DMSP-17 SSMIS RADIANCES CHANNEL 11 : out of range
Considerable: obs_number=23298.0000, expected range: 28771.1003 37927.3703
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=17062.0000, expected range: 19252.1398 25260.5661
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=17005.0000, expected range: 19262.3022 25214.4037
Atmospheric Motion Vector
METOP-C AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=283.0000, expected range: 86.2073 188.2927
GOES-17 AMV CLOUDY WV3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HP : out of range
Considerable: stdev_fgdepar=3.2174, expected range: 2.2133 2.7862