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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-09-15 12:00

iasi
METOP-B IASI RADIANCES CHANNEL 131 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3609, expected range: 0.3902 0.4244
METOP-C IASI RADIANCES (220 channels affected) : out of range
Severe: obs_number=6796.0000, expected range: 21856.9951 23895.2049
METOP-C IASI RADIANCES CHANNEL 63 : out of range
Severe: avg_fgdepar=-0.0230, expected range: -0.0063 0.0145
METOP-C IASI RADIANCES CHANNEL 79 : out of range
Severe: avg_fgdepar=-0.0111, expected range: 0.0015 0.0180
METOP-C IASI RADIANCES CHANNEL 116 : out of range
Severe: avg_fgdepar=-0.0311, expected range: -0.0075 0.0146
METOP-C IASI RADIANCES CHANNEL 122 : out of range
Severe: avg_fgdepar=-0.0350, expected range: -0.0078 0.0153
METOP-C IASI RADIANCES CHANNEL 148 : out of range
Severe: avg_fgdepar=-0.0288, expected range: -0.0026 0.0114
METOP-C IASI RADIANCES CHANNEL 161 : out of range
Severe: avg_fgdepar=-0.0297, expected range: -0.0089 0.0176
METOP-C IASI RADIANCES CHANNEL 310 : out of range
Considerable: stdev_fgdepar=0.1969, expected range: 0.2122 0.2379
METOP-C IASI RADIANCES CHANNEL 341 : out of range
Considerable: stdev_fgdepar=0.1972, expected range: 0.2134 0.2439
METOP-C IASI RADIANCES CHANNEL 362 : out of range
Considerable: stdev_fgdepar=0.2051, expected range: 0.2236 0.2501
METOP-C IASI RADIANCES CHANNEL 369 : out of range
Considerable: stdev_fgdepar=0.2071, expected range: 0.2240 0.2521
METOP-C IASI RADIANCES CHANNEL 371 : out of range
Considerable: stdev_fgdepar=0.1924, expected range: 0.2119 0.2390
METOP-C IASI RADIANCES CHANNEL 381 : out of range
Considerable: stdev_fgdepar=0.2497, expected range: 0.2649 0.2942
METOP-C IASI RADIANCES CHANNEL 389 : out of range
Considerable: stdev_fgdepar=0.2134, expected range: 0.2292 0.2585
METOP-C IASI RADIANCES CHANNEL 407 : out of range
Considerable: stdev_fgdepar=0.2066, expected range: 0.2240 0.2587
METOP-C IASI RADIANCES CHANNEL 571 : out of range
Considerable: stdev_fgdepar=0.2781, expected range: 0.2968 0.3330
airs
AQUA AIRS RADIANCES CHANNEL 93 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0934, expected range: -0.0672 -0.0417
AQUA AIRS RADIANCES CHANNEL 99 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0343, expected range: 0.0494 0.0648
AQUA AIRS RADIANCES CHANNEL 104 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0299, expected range: 0.0535 0.0800
AQUA AIRS RADIANCES CHANNEL 111 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0657, expected range: -0.0449 -0.0262
AQUA AIRS RADIANCES CHANNEL 116 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0106, expected range: 0.0522 0.0670
AQUA AIRS RADIANCES CHANNEL 123 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.1041, expected range: -0.0793 -0.0639
AQUA AIRS RADIANCES CHANNEL 128 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0428, expected range: 0.0652 0.0900
AQUA AIRS RADIANCES CHANNEL 129 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.1060, expected range: -0.0794 -0.0518
atms
NPP ATMS RADIANCES CHANNEL 14 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0731, expected range: -0.0571 -0.0307
ssmis
DMSP-18 SSMIS RADIANCES CHANNEL 7 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=4.8421, expected range: 3.7067 4.2426
gpsro
COSMIC2-E2 GPSRO SETTING HEIGHT 12-14 KM : out of range
Slight: stdev_norm_fgdepar=1.1254, expected range: 0.7408 1.0434
SPIRE LEMUR 3U GPSRO SETTING (24 impact heights affected) : out of range
Slight: obs_number=3406.0000, expected range: 4006.3733 5212.6855
amdar
TAMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : missing
2 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 252.9005