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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-01-11 00:00

amsua
NOAA 19 AMSUA ALL SKY RADIANCES CHANNEL 10 : out of range
Severe: avg_biascorr=0.1318, expected range: 0.0537 0.0944
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
Considerable: avg_biascorr=-0.2660, expected range: -0.2526 -0.2299
cris
NOAA20 CRIS RADIANCES (24 channels affected) : out of range
Slight: obs_number=21397.0000, expected range: 22994.6692 23256.8602
airs
AQUA AIRS RADIANCES CHANNEL 1069 : out of range
Slight: stdev_fgdepar=0.3277, expected range: 0.2582 0.3100
mhs
NOAA-19 MHS ALLSKY RADIANCES CHANNEL 1 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.1381, expected range: 0.1140 0.1263
METOP-B MHS ALLSKY RADIANCES CHANNEL 4 : out of range
Considerable: avg_biascorr=0.0570, expected range: -0.2121 -0.0428
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 7 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: obs_number=4752.0000, expected range: 5600.9983 5861.3909
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 14 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: obs_number=6109.0000, expected range: 7907.5258 8002.2493
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 15 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: obs_number=5206.0000, expected range: 6688.3813 6735.5186
FY-3D MWHS2 ALLSKY RADIANCES (5 channels affected) : out of range
Considerable: obs_number=15619.0000, expected range: 16708.0560 19371.6878
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 3 : out of range
Slight: obs_number=50523.0000, expected range: 52369.1972 59443.1778
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 4 : out of range
Slight: obs_number=50523.0000, expected range: 52369.0491 59443.5759
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1443, expected range: -0.2309 -0.2025
NPP ATMS RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.3550, expected range: -0.2951 -0.2761
NPP ATMS RADIANCES CHANNEL 14 : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.2339, expected range: -0.1972 -0.1483
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.5133, expected range: -0.4485 -0.4384
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.4004, expected range: -0.3689 -0.3381
NPP ATMS RADIANCES (15 channels affected) : out of range
Considerable: obs_number=17441.0000, expected range: 20371.7302 24865.5198
NOAA20 ATMS RADIANCES (15 channels affected) : out of range
Considerable: obs_number=16614.0000, expected range: 20657.4335 25150.3165
gpsro
COSMIC2-E3 GPSRO RISING (22 impact heights affected) : out of range
Considerable: obs_number=1429.0000, expected range: 1668.6753 2527.6997
COSMIC2-E2 GPSRO SETTING HEIGHT 46-48 KM : out of range
Slight: stdev_norm_fgdepar=0.7975, expected range: 0.4553 0.7181