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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-09-29 18:00

iasi
METOP-B IASI RADIANCES CHANNEL 70 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3180, expected range: 0.2731 0.2963
METOP-B IASI RADIANCES CHANNEL 16 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4222, expected range: 0.3533 0.3917
METOP-B IASI RADIANCES CHANNEL 138 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2646, expected range: 0.2249 0.2415
METOP-B IASI RADIANCES CHANNEL 146 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2724, expected range: 0.2296 0.2535
METOP-B IASI RADIANCES CHANNEL 151 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2617, expected range: 0.2226 0.2435
METOP-B IASI RADIANCES CHANNEL 170 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2568, expected range: 0.2181 0.2391
METOP-B IASI RADIANCES CHANNEL 189 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2476, expected range: 0.2154 0.2318
METOP-B IASI RADIANCES CHANNEL 303 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2548, expected range: 0.2029 0.2325
METOP-B IASI RADIANCES CHANNEL 386 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0164, expected range: 0.0774 0.1444
METOP-C IASI RADIANCES CHANNEL 386 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0082, expected range: 0.0862 0.1284
METOP-C IASI RADIANCES CHANNEL 66 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3088, expected range: 0.3574 0.4129
METOP-C IASI RADIANCES CHANNEL 111 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2965, expected range: 0.3303 0.3692
METOP-C IASI RADIANCES (35 channels affected) : out of range
Severe: avg_biascorr=0.0748, expected range: 0.1173 0.1616
mwhs2
All FY-3C MWHS2 ALLSKY ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 29779.74
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3400, expected range: -0.3057 -0.2790
NPP ATMS RADIANCES CHANNEL 9 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5351, expected range: -0.4736 -0.4304
NOAA20 ATMS RADIANCES CHANNEL 10 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4730, expected range: -0.4350 -0.4197
NOAA20 ATMS RADIANCES CHANNEL 8 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6843, expected range: -0.6085 -0.5831
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 125747.96