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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-09-30 00:00

iasi
METOP-C IASI RADIANCES CHANNEL 61 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3328, expected range: 0.2681 0.3022
METOP-C IASI RADIANCES CHANNEL 79 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3834, expected range: 0.3087 0.3256
METOP-C IASI RADIANCES CHANNEL 85 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3537, expected range: 0.2487 0.2842
METOP-C IASI RADIANCES CHANNEL 59 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3577, expected range: 0.3077 0.3304
METOP-C IASI RADIANCES CHANNEL 83 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4052, expected range: 0.2997 0.3338
METOP-C IASI RADIANCES CHANNEL 386 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0211, expected range: 0.0862 0.1234
METOP-C IASI RADIANCES CHANNEL 301 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0198, expected range: 0.0313 0.0765
METOP-C IASI RADIANCES (26 channels affected) : out of range
Severe: avg_biascorr=0.1676, expected range: 0.2242 0.2283
METOP-C IASI RADIANCES CHANNEL 74 : out of range
4 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.3227, expected range: 0.3439 0.3859
METOP-C IASI RADIANCES CHANNEL 131 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.2546, expected range: 0.2788 0.3235
METOP-B IASI RADIANCES CHANNEL 271 : out of range
Slight: stdev_fgdepar=0.2577, expected range: 0.2030 0.2571
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3327, expected range: -0.3057 -0.2797
NPP ATMS RADIANCES CHANNEL 12 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2807, expected range: -0.2117 -0.1601
NPP ATMS RADIANCES CHANNEL 9 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5376, expected range: -0.4736 -0.4416
NOAA20 ATMS RADIANCES CHANNEL 10 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5026, expected range: -0.4350 -0.4280
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3697, expected range: -0.3201 -0.2868
NOAA20 ATMS RADIANCES CHANNEL 8 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7219, expected range: -0.6085 -0.5842