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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-01-03 00:00

amsua
NOAA-18 AMSUA RADIANCES CHANNEL 7 : out of range
Severe: stdev_fgdepar=0.2616, expected range: 0.1947 0.2285
NOAA-19 AMSUA RADIANCES CHANNEL 14 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0440, expected range: -0.0639 -0.0017
NOAA-19 AMSUA RADIANCES CHANNEL 10 : out of range
3 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.2881, expected range: 0.1630 0.2456
NOAA-19 AMSUA RADIANCES CHANNEL 11 : out of range
4 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.3814, expected range: 0.1529 0.3047
METOP-A AMSUA RADIANCES CHANNEL 14 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.1113, expected range: 0.0312 0.0781
METOP-A AMSUA RADIANCES CHANNEL 10 : out of range
4 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.2947, expected range: 0.1830 0.2504
METOP-C AMSUA RADIANCES CHANNEL 10 : out of range
2 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.2715, expected range: 0.1476 0.2185
iasi
METOP-B IASI RADIANCES (220 channels affected) : out of range
Severe: obs_number=16338.0000, expected range: 21949.4154 23269.0846
METOP-C IASI RADIANCES (188 channels affected) : out of range
Severe: obs_number=15821.0000, expected range: 21585.8512 23251.0238
METOP-B IASI RADIANCES CHANNEL 320 : out of range
Slight: stdev_fgdepar=0.2863, expected range: 0.2338 0.2708
METOP-B IASI RADIANCES CHANNEL 364 : out of range
Slight: stdev_fgdepar=0.2853, expected range: 0.2325 0.2739
METOP-B IASI RADIANCES CHANNEL 375 : out of range
Slight: stdev_fgdepar=0.2811, expected range: 0.2318 0.2665
METOP-B IASI RADIANCES CHANNEL 381 : out of range
Slight: stdev_fgdepar=0.2953, expected range: 0.2645 0.2890
METOP-B IASI RADIANCES CHANNEL 389 : out of range
Slight: stdev_fgdepar=0.2878, expected range: 0.2518 0.2795
cris
NOAA20 CRIS RADIANCES CHANNEL 33 : out of range
Considerable: stdev_fgdepar=0.5915, expected range: 0.0000 0.3840
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 11058.98 27120.83
mhs
METOP-A MHS ALLSKY RADIANCES CHANNEL 3 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_norm_fgdepar=0.0888, expected range: -0.0244 0.0288
Severely_persistent: stdev_norm_fgdepar=0.4872, expected range: 0.0788 0.1500
METOP-A MHS ALLSKY RADIANCES CHANNEL 4 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_norm_fgdepar=0.1202, expected range: -0.0426 0.0464
Severely_persistent: stdev_norm_fgdepar=0.4690, expected range: 0.0670 0.1765
atms
NPP ATMS RADIANCES CHANNEL 10 : out of range
1 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0121, expected range: -0.3918 -0.1780
Considerable: obs_number=3525.0000, expected range: 2935.9693 3366.9057
NPP ATMS RADIANCES CHANNEL 12 : out of range
4 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.4162, expected range: 0.1303 0.2844
NOAA20 ATMS RADIANCES CHANNEL 11 : out of range
2 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.2613, expected range: 0.1175 0.1941
NPP ATMS RADIANCES CHANNEL 11 : out of range
2 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.2770, expected range: 0.1555 0.2268
Considerable: obs_number=3525.0000, expected range: 2935.8456 3366.9044
NPP ATMS RADIANCES CHANNEL 13 : out of range
2 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.5924, expected range: 0.1648 0.4351
NPP ATMS RADIANCES CHANNEL 9 : out of range
Considerable: obs_number=3525.0000, expected range: 2935.7455 3367.2545
NPP ATMS RADIANCES CHANNEL 15 : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=3522.0000, expected range: 2951.9520 3343.4230
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
4 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.4028, expected range: 0.0811 0.2653
Considerable: avg_fgdepar=-0.4183, expected range: -0.1885 0.2370
NOAA20 ATMS RADIANCES CHANNEL 9 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.4405, expected range: -0.8162 -0.5761
gpsro
All COSMIC2-E2 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 709.52 3470.72