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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-10-04 00:00

cris
NOAA20 CRIS RADIANCES CHANNEL 113 : out of range
Considerable: avg_fgdepar=0.0468, expected range: -0.1757 -0.0372
airs
AQUA AIRS RADIANCES CHANNEL 207 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3256, expected range: -0.4064 -0.4021
AQUA AIRS RADIANCES CHANNEL 224 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7050, expected range: -0.8129 -0.7728
AQUA AIRS RADIANCES CHANNEL 239 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.8062, expected range: -1.0453 -0.9347
AQUA AIRS RADIANCES CHANNEL 210 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6277, expected range: -0.8192 -0.7702
AQUA AIRS RADIANCES CHANNEL 213 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.8017, expected range: -0.9515 -0.9231
AQUA AIRS RADIANCES CHANNEL 22 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0202, expected range: 0.1204 0.1556
AQUA AIRS RADIANCES CHANNEL 226 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6312, expected range: -0.5265 -0.4204
atms
NPP ATMS RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.4430, expected range: 0.2704 0.3750
gpsro
METOP-A GRAS SETTING HEIGHT 2-4 KM : out of range
18 times in the last 10 days for at least one item
Slight: avg_norm_fgdepar=-0.1170, expected range: 0.1269 0.1269
METOP-B GRAS SETTING HEIGHT 2-4 KM : out of range
8 times in the last 10 days for at least one item
Slight: avg_norm_fgdepar=-0.1032, expected range: -0.0664 0.0601
METOP-C GRAS SETTING HEIGHT 2-4 KM : out of range
19 times in the last 10 days for at least one item
Slight: avg_norm_fgdepar=-0.0872, expected range: 0.1444 0.1444
Atmospheric Motion Vector
HIMAWARI-8 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HPA : out of range
Severe: avg_fgdepar=2.0458, expected range: 1.6410 1.8137