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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-12-31 00:00

iasi
METOP-B IASI RADIANCES CHANNEL 185 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2673, expected range: -0.2465 -0.2191
METOP-B IASI RADIANCES CHANNEL 207 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2471, expected range: -0.2181 -0.1801
METOP-B IASI RADIANCES CHANNEL 1509 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0801, expected range: -0.1411 -0.0650
METOP-B IASI RADIANCES CHANNEL 1513 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1120, expected range: -0.0074 0.0574
METOP-B IASI RADIANCES CHANNEL 1639 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0397, expected range: -0.1309 -0.0500
METOP-B IASI RADIANCES CHANNEL 1658 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3607, expected range: 0.2813 0.3059
METOP-C IASI RADIANCES CHANNEL 185 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3572, expected range: -0.3285 -0.3095
METOP-C IASI RADIANCES CHANNEL 187 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3795, expected range: -0.3494 -0.3122
METOP-C IASI RADIANCES CHANNEL 207 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3185, expected range: -0.2867 -0.2601
METOP-C IASI RADIANCES CHANNEL 222 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0394, expected range: 0.0554 0.0648
METOP-A IASI RADIANCES CHANNEL 207 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.3027, expected range: -0.2803 -0.2448
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 4604.89 8955.69
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 9 : out of range
Considerable: obs_number=2181.0000, expected range: 2837.7480 4983.4035
DMSP-17 SSMIS RADIANCES CHANNEL 10 : out of range
Considerable: obs_number=2276.0000, expected range: 3042.8750 5365.7916
DMSP-17 SSMIS RADIANCES CHANNEL 11 : out of range
Considerable: obs_number=2288.0000, expected range: 3133.8779 5521.0312
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
Considerable: obs_number=1548.0000, expected range: 2160.4713 4524.1954
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
Considerable: obs_number=1554.0000, expected range: 2179.3604 4524.3366
gpsro
All COSMIC2-E1 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 408.48 1739.91
Atmospheric Motion Vector
HIMAWARI-8 AMV VIS1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA : out of range
Considerable: obs_number=926.0000, expected range: 1218.2219 1759.5281