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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-09-19 00:00

iasi
METOP-B IASI RADIANCES CHANNEL 79 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2732, expected range: 0.3063 0.3470
METOP-B IASI RADIANCES CHANNEL 131 : out of range
23 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3251, expected range: 0.3592 0.3882
METOP-B IASI RADIANCES CHANNEL 133 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2351, expected range: 0.2719 0.3143
METOP-C IASI RADIANCES CHANNEL 79 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3641, expected range: 0.2829 0.3256
METOP-C IASI RADIANCES CHANNEL 386 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0407, expected range: 0.0862 0.1408
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3484, expected range: -0.3057 -0.2517
NPP ATMS RADIANCES CHANNEL 9 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5228, expected range: -0.4736 -0.4448
NOAA20 ATMS RADIANCES CHANNEL 11 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4344, expected range: -0.3807 -0.3752
NOAA20 ATMS RADIANCES CHANNEL 8 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7020, expected range: -0.6085 -0.5978
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 119359.06
resat
NOAA-19 SBUV OZONE, TOP (21 pressure layers affected) : out of range
32 times in the last 10 days for at least one item
Severely_persistent: obs_number=88.0000, expected range: 64.3706 68.2921
METOP-B GOME-2 OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
11 times in the last 10 days for at least one item
Slight: obs_number=27861.0000, expected range: 15252.6968 24241.8471