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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Ensemble Data Assimilation at 2021-04-15 00:00

amsua
NOAA-19 AMSUA RADIANCES (6 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=5690.0000, expected range: 6707.2561 9467.7439
METOP-C AMSUA RADIANCES (10 channels affected) : out of range
Considerable: obs_number=9079.0000, expected range: 13750.9705 22296.2795
iasi
METOP-B IASI RADIANCES CHANNEL 217 : out of range
Considerable: obs_number=1602.0000, expected range: 1721.5648 2198.3102
METOP-B IASI RADIANCES CHANNEL 219 : out of range
Considerable: obs_number=1595.0000, expected range: 1714.8334 2191.1666
METOP-B IASI RADIANCES CHANNEL 226 : out of range
Considerable: obs_number=1571.0000, expected range: 1690.4914 2165.0086
METOP-B IASI RADIANCES CHANNEL 230 : out of range
Considerable: obs_number=1539.0000, expected range: 1667.2625 2137.7375
cris
NPP CRIS RADIANCES CHANNEL 85 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0857, expected range: -0.0794 -0.0753
NPP CRIS RADIANCES CHANNEL 87 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0146, expected range: -0.0075 -0.0060
NPP CRIS RADIANCES CHANNEL 88 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0282, expected range: -0.0250 -0.0233
NPP CRIS RADIANCES CHANNEL 91 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0400, expected range: 0.0534 0.0537
NPP CRIS RADIANCES CHANNEL 92 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0994, expected range: 0.1105 0.1119
NPP CRIS RADIANCES CHANNEL 111 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0422, expected range: -0.0317 -0.0235
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0392, expected range: 0.0499 0.0529
NOAA20 CRIS RADIANCES CHANNEL 123 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0522, expected range: -0.0455 -0.0393
NOAA20 CRIS RADIANCES CHANNEL 124 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0770, expected range: -0.0697 -0.0635
airs
AQUA AIRS RADIANCES CHANNEL 1038 : out of range
Severe: avg_biascorr=0.0454, expected range: 0.0541 0.0599
AQUA AIRS RADIANCES CHANNEL 1048 : out of range
Severe: avg_biascorr=-0.0088, expected range: -0.0010 0.0046
AQUA AIRS RADIANCES CHANNEL 1565 : out of range
Severe: stdev_fgdepar=1.2158, expected range: 1.0660 1.1041
AQUA AIRS RADIANCES (34 channels affected) : out of range
Considerable: obs_number=825.0000, expected range: 984.6271 1131.6245
AQUA AIRS RADIANCES CHANNEL 1740 : out of range
Considerable: stdev_fgdepar=1.4317, expected range: 1.2238 1.3609
AQUA AIRS RADIANCES CHANNEL 1471 : out of range
Slight: stdev_fgdepar=0.5484, expected range: 0.4908 0.5156
gpsro
COSMIC2-E3 GPSRO RISING HEIGHT 48-50 KM : out of range
Slight: stdev_norm_fgdepar=0.7873, expected range: 0.3574 0.6791
COSMIC2-E5 GPSRO SETTING HEIGHT 14-16 KM : out of range
Slight: avg_norm_fgdepar=-0.3401, expected range: -0.2059 0.1180
amdar
WIGOS AMDAR WIND VECTOR DIFF (M/S) (3 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=1967.0000, expected range: 147.7682 555.8568