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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-04-16 06:00

iasi
METOP-C IASI RADIANCES CHANNEL 515 : out of range
Considerable: stdev_fgdepar=0.5716, expected range: 0.2271 0.4306
METOP-C IASI RADIANCES CHANNEL 552 : out of range
Considerable: stdev_fgdepar=0.5497, expected range: 0.2185 0.4319
cris
NPP CRIS RADIANCES CHANNEL 85 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0714, expected range: -0.0622 -0.0600
NPP CRIS RADIANCES CHANNEL 87 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0087, expected range: 0.0166 0.0179
NOAA20 CRIS RADIANCES CHANNEL 82 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0190, expected range: 0.0245 0.0301
NOAA20 CRIS RADIANCES CHANNEL 83 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0030, expected range: 0.0055 0.0092
NOAA20 CRIS RADIANCES CHANNEL 143 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0816, expected range: -0.0750 -0.0699
NOAA20 CRIS RADIANCES CHANNEL 144 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0956, expected range: -0.0887 -0.0831
NOAA20 CRIS RADIANCES CHANNEL 120 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0712, expected range: -0.0605 -0.0488
NOAA20 CRIS RADIANCES CHANNEL 123 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0380, expected range: -0.0247 -0.0166
NOAA20 CRIS RADIANCES CHANNEL 124 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0597, expected range: -0.0418 -0.0399
NOAA20 CRIS RADIANCES CHANNEL 125 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1087, expected range: -0.0909 -0.0865
NOAA20 CRIS RADIANCES CHANNEL 126 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0463, expected range: -0.0361 -0.0263
NOAA20 CRIS RADIANCES CHANNEL 138 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1203, expected range: -0.1042 -0.0994
NOAA20 CRIS RADIANCES CHANNEL 110 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0702, expected range: 0.0782 0.0792
Atmospheric Motion Vector
GOES-16 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=2193.0000, expected range: 742.3137 1699.9363
amdar
All TAMDAR ALL LAYERS West pacific Tropica : all data missing
Severe: obs_number=0, expected range: 0.00 261.98