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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-09-25 00:00

iasi
METOP-B IASI RADIANCES CHANNEL 79 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4172, expected range: 0.3373 0.3628
Severely_persistent: avg_biascorr=0.2551, expected range: 0.3063 0.3226
METOP-B IASI RADIANCES CHANNEL 81 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4038, expected range: 0.3304 0.3723
METOP-B IASI RADIANCES CHANNEL 83 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4276, expected range: 0.3224 0.3601
Severely_persistent: avg_biascorr=0.1843, expected range: 0.2410 0.2841
METOP-B IASI RADIANCES CHANNEL 85 : out of range
23 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3830, expected range: 0.2611 0.3194
METOP-B IASI RADIANCES CHANNEL 59 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3030, expected range: 0.3432 0.3574
METOP-B IASI RADIANCES CHANNEL 61 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2554, expected range: 0.2948 0.3067
METOP-B IASI RADIANCES CHANNEL 66 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2761, expected range: 0.2993 0.3172
METOP-B IASI RADIANCES CHANNEL 111 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2160, expected range: 0.2437 0.2628
METOP-B IASI RADIANCES CHANNEL 125 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3176, expected range: 0.3479 0.3671
METOP-B IASI RADIANCES CHANNEL 131 : out of range
26 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3153, expected range: 0.3592 0.3652
METOP-B IASI RADIANCES CHANNEL 133 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2234, expected range: 0.2719 0.2746
METOP-B IASI RADIANCES CHANNEL 138 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3418, expected range: 0.3736 0.4014
METOP-C IASI RADIANCES (18 channels affected) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2090, expected range: 0.2375 0.2598
METOP-C IASI RADIANCES CHANNEL 79 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3534, expected range: 0.2912 0.3256
METOP-C IASI RADIANCES CHANNEL 386 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0420, expected range: 0.0862 0.1097
METOP-C IASI RADIANCES CHANNEL 301 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0216, expected range: 0.0313 0.0989
METOP-C IASI RADIANCES (31 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1585, expected range: 0.2242 0.2301
atms
NPP ATMS RADIANCES CHANNEL 10 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2298, expected range: -0.2051 -0.1768
NPP ATMS RADIANCES CHANNEL 9 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5996, expected range: -0.4736 -0.4019
NOAA20 ATMS RADIANCES CHANNEL 8 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7465, expected range: -0.6085 -0.5784
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 17 : out of range
Considerable: avg_biascorr=-2.4162, expected range: -3.0647 -2.6613