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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-10-16 12:00

iasi
METOP-B IASI RADIANCES CHANNEL 286 : out of range
Considerable: obs_number=2512.0000, expected range: 1986.9686 2337.0314
METOP-B IASI RADIANCES CHANNEL 310 : out of range
Considerable: obs_number=2043.0000, expected range: 1574.9079 1942.2921
METOP-B IASI RADIANCES CHANNEL 316 : out of range
Considerable: obs_number=2016.0000, expected range: 1562.8055 1897.1945
METOP-B IASI RADIANCES CHANNEL 323 : out of range
Considerable: obs_number=2450.0000, expected range: 1967.3677 2222.6323
METOP-B IASI RADIANCES CHANNEL 371 : out of range
Considerable: obs_number=1931.0000, expected range: 1487.6699 1819.5301
METOP-B IASI RADIANCES CHANNEL 389 : out of range
Considerable: obs_number=2231.0000, expected range: 1707.9214 2101.6786
METOP-B IASI RADIANCES CHANNEL 414 : out of range
Considerable: obs_number=1877.0000, expected range: 1490.8812 1783.5188
METOP-C IASI RADIANCES CHANNEL 515 : out of range
Considerable: avg_fgdepar=0.1250, expected range: 0.0757 0.1045
atms
NPP ATMS RADIANCES CHANNEL 20 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2937, expected range: 0.2137 0.2540
NOAA20 ATMS RADIANCES CHANNEL 19 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1205, expected range: -0.1769 -0.1489
NOAA20 ATMS RADIANCES CHANNEL 20 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0042, expected range: -0.1044 -0.0601
ssmis
DMSP-17 SSMIS RADIANCES (9 channels affected) : out of range
Considerable: obs_number=5252.0000, expected range: 11647.8613 21803.7858
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=1201.0000, expected range: 3361.8142 6882.8917
Considerable: stdev_norm_fgdepar=0.5600, expected range: 0.6158 0.7200
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=1199.0000, expected range: 3355.5432 6902.5745
Slight: stdev_norm_fgdepar=0.6394, expected range: 0.6846 0.7962
DMSP-18 SSMIS RADIANCES CHANNEL 9 : out of range
1 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.5054, expected range: 0.5349 0.6431
gpsro
All TERRASAR-X GPSRO SETTING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 296.96 1614.03
COSMIC2-E2 GPSRO SETTING HEIGHT 42-44 KM : out of range
Considerable: stdev_norm_fgdepar=1.0573, expected range: 0.3695 0.8066
Atmospheric Motion Vector
GOES-17 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
Considerable: stdev_press=99.3187, expected range: 72.5234 87.8279
amdar
ADS-C WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : missing
6 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 0.0000 263.4462