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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-07-30 12:00

cris
NOAA20 CRIS RADIANCES CHANNEL 1005 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1589, expected range: 0.1763 0.1933
mwhs2
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 13 : out of range
Considerable: stdev_norm_fgdepar=0.9200, expected range: 0.6218 0.8165
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 15 : out of range
Considerable: stdev_norm_fgdepar=0.8293, expected range: 0.5634 0.7219
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 7 : out of range
1 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.9475, expected range: 0.6065 0.8347
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 12 : out of range
1 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.9453, expected range: 0.6165 0.8785
atms
All NPP ATMS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 11818.28 14469.88
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 8 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.1267, expected range: 0.4848 0.5634
DMSP-17 SSMIS RADIANCES CHANNEL 9 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.1041, expected range: 0.5218 0.6884
DMSP-17 SSMIS RADIANCES CHANNEL 10 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0611, expected range: 0.5640 0.6326
DMSP-17 SSMIS RADIANCES CHANNEL 11 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0294, expected range: 0.1655 0.2370
Slight: stdev_norm_fgdepar=0.0411, expected range: 0.6268 0.6268
DMSP-18 SSMIS RADIANCES CHANNEL 9 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0836, expected range: 0.5083 0.5661
DMSP-17 SSMIS RADIANCES CHANNEL 17 : out of range
11 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.0821, expected range: 0.7550 0.7550
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
15 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.0524, expected range: 0.5965 0.5965
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
9 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.0351, expected range: 0.6654 0.6654
Atmospheric Motion Vector
All AQUA MODIS CLEAR WV ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1209.05
All NPP VIIRS AMV IR ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 83.52 1485.57
scatt
HY-2B SCATTEROMETER WIND VECTOR DIFF (M/S) : out of range
1 times in the last 10 days for at least one item
Slight: obs_number=60842.0000, expected range: 82337.6259 167028.0212
amdar
TAMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : missing
4 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 258.3698