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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Early delivery 4D-VAR at 2021-04-13 06:00

iasi
METOP-A IASI RADIANCES CHANNEL 546 : out of range
Severe: stdev_fgdepar=0.5109, expected range: 0.2820 0.4116
METOP-B IASI RADIANCES CHANNEL 236 : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0353, expected range: 0.0469 0.0598
METOP-B IASI RADIANCES CHANNEL 515 : out of range
Severe: stdev_fgdepar=0.5860, expected range: 0.2579 0.4149
METOP-A IASI RADIANCES CHANNEL 254 : out of range
Considerable: avg_biascorr=-0.1534, expected range: -0.1457 -0.1308
cris
NPP CRIS RADIANCES CHANNEL 85 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0720, expected range: -0.0622 -0.0580
NPP CRIS RADIANCES CHANNEL 87 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0083, expected range: 0.0166 0.0208
NPP CRIS RADIANCES CHANNEL 110 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0106, expected range: 0.0227 0.0263
NOAA20 CRIS RADIANCES CHANNEL 82 : out of range
26 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0170, expected range: 0.0245 0.0315
NOAA20 CRIS RADIANCES CHANNEL 83 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0055, expected range: 0.0055 0.0106
NOAA20 CRIS RADIANCES CHANNEL 143 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0825, expected range: -0.0750 -0.0706
NOAA20 CRIS RADIANCES CHANNEL 144 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0942, expected range: -0.0887 -0.0816
NOAA20 CRIS RADIANCES CHANNEL 124 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0550, expected range: -0.0418 -0.0356
NOAA20 CRIS RADIANCES CHANNEL 125 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1001, expected range: -0.0909 -0.0842
NOAA20 CRIS RADIANCES CHANNEL 138 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1159, expected range: -0.1042 -0.0999
NOAA20 CRIS RADIANCES CHANNEL 110 : out of range
32 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0690, expected range: 0.0782 0.0862
NPP CRIS RADIANCES CHANNEL 144 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.1112, expected range: -0.1039 -0.0954
NPP CRIS RADIANCES CHANNEL 143 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0893, expected range: -0.0839 -0.0764
ssmis
DMSP-17 SSMIS RADIANCES (9 channels affected) : out of range
Considerable: obs_number=1165.0000, expected range: 1946.2206 4527.7206
gpsro
COSMIC2-E6 GPSRO SETTING HEIGHT 42-44 KM : out of range
Slight: stdev_norm_fgdepar=0.8277, expected range: 0.3779 0.7302
amdar
All TAMDAR ALL LAYERS West pacific Tropica : all data missing
Severe: obs_number=0, expected range: 0.00 285.85
All WIGOS AMDAR Q (G/KG) ALL LAYERS North Atlantic : all data missing
Severe: obs_number=0, expected range: 0.00 257.24