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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-04-14 12:00

cris
NPP CRIS RADIANCES CHANNEL 86 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0718, expected range: -0.0627 -0.0626
NPP CRIS RADIANCES CHANNEL 87 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0122, expected range: -0.0075 -0.0048
NPP CRIS RADIANCES CHANNEL 91 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0423, expected range: 0.0534 0.0545
NPP CRIS RADIANCES CHANNEL 143 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0897, expected range: -0.0795 -0.0774
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0441, expected range: 0.0499 0.0540
NOAA20 CRIS RADIANCES CHANNEL 124 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0765, expected range: -0.0697 -0.0616
NOAA20 CRIS RADIANCES CHANNEL 73 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=2476.0000, expected range: 2093.5854 2397.3558
airs
AQUA AIRS RADIANCES (130 channels affected) : out of range
Slight: avg_fgdepar=0.0197, expected range: 0.0751 0.0751
AQUA AIRS RADIANCES CHANNEL 787 : out of range
Slight: stdev_fgdepar=0.2510, expected range: 0.2367 0.2367
AQUA AIRS RADIANCES CHANNEL 1115 : out of range
Slight: stdev_fgdepar=0.4030, expected range: 0.3782 0.3782
AQUA AIRS RADIANCES CHANNEL 1329 : out of range
Slight: stdev_fgdepar=0.2852, expected range: 0.2677 0.2677
AQUA AIRS RADIANCES CHANNEL 1424 : out of range
Slight: stdev_fgdepar=0.8068, expected range: 0.7492 0.7492
gpsro
All COSMIC2-E5 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 568.31 2737.79
COSMIC2-E1 GPSRO SETTING HEIGHT 48-50 KM : out of range
Slight: stdev_norm_fgdepar=0.6035, expected range: 0.2864 0.5103
amdar
ADS-C TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : missing
7 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 0.0000 286.7588
WIGOS AMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=1633.0000, expected range: 154.1564 538.7848