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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-10-28 00:00

amsua
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 8 : out of range
Severe: stdev_norm_fgdepar=0.0058, expected range: 0.9364 0.9868
iasi
METOP-C IASI RADIANCES CHANNEL 515 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.1269, expected range: 0.0757 0.1045
METOP-B IASI RADIANCES (25 channels affected) : out of range
Considerable: obs_number=1983.0000, expected range: 1489.8330 1858.5670
METOP-C IASI RADIANCES CHANNEL 1626 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.1083, expected range: 0.0549 0.0904
METOP-C IASI RADIANCES CHANNEL 271 : out of range
Considerable: obs_number=700.0000, expected range: 230.8049 596.7951
METOP-C IASI RADIANCES CHANNEL 329 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=790.0000, expected range: 228.5143 665.4857
METOP-C IASI RADIANCES CHANNEL 354 : out of range
Considerable: obs_number=869.0000, expected range: 352.0219 765.5781
METOP-C IASI RADIANCES CHANNEL 360 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=846.0000, expected range: 325.8248 702.5752
cris
NOAA20 CRIS RADIANCES CHANNEL 107 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=7778.0000, expected range: 6620.8797 7483.5203
NOAA20 CRIS RADIANCES CHANNEL 118 : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=4748.0000, expected range: 4013.6798 4582.3202
NOAA20 CRIS RADIANCES CHANNEL 120 : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=4507.0000, expected range: 3794.5040 4355.4960
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=4691.0000, expected range: 3966.5262 4519.0738
NOAA20 CRIS RADIANCES (31 channels affected) : out of range
Considerable: obs_number=2152.0000, expected range: 1482.0405 1917.5595
airs
AQUA AIRS RADIANCES CHANNEL 1111 : out of range
Considerable: avg_biascorr=0.4191, expected range: 0.3544 0.3960
amsr2
AMSR2 GCOM-W1 ALLSKY RADIANCES (6 channels affected) : out of range
Considerable: obs_number=9149.0000, expected range: 15527.9912 18815.1338
atms
NPP ATMS RADIANCES CHANNEL 21 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2086, expected range: 0.1577 0.1757
NPP ATMS RADIANCES CHANNEL 15 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.8157, expected range: 0.6289 0.7315
NPP ATMS RADIANCES CHANNEL 20 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3028, expected range: 0.2523 0.2540
NPP ATMS RADIANCES CHANNEL 22 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.6627, expected range: 0.5871 0.6123
NOAA20 ATMS RADIANCES CHANNEL 21 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0510, expected range: -0.1171 -0.0844
NOAA20 ATMS RADIANCES CHANNEL 15 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.8064, expected range: 0.5538 0.6636
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
3 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4553, expected range: 0.3188 0.3819
Severe: stdev_fgdepar=0.4457, expected range: 0.3390 0.3991
NOAA20 ATMS RADIANCES CHANNEL 19 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1228, expected range: -0.1582 -0.1489
gpsro
COSMIC2-E1 GPSRO SETTING (23 impact heights affected) : out of range
Considerable: obs_number=1846.0000, expected range: 2066.7304 2723.6446
ASCAT EARS
All METOP-A ASCAT Global : all data missing
Severe: obs_number=0, expected range: 0.00 1538.02
amdar
AMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : missing
Severe: obs_number=0.0000, expected range: 0.0000 285.8370