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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-10-24 12:00

amsua
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
Considerable: stdev_norm_fgdepar=0.6436, expected range: 0.5082 0.5914
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
Considerable: stdev_norm_fgdepar=0.6341, expected range: 0.5048 0.5903
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
Considerable: stdev_norm_fgdepar=0.6015, expected range: 0.4747 0.5504
iasi
METOP-B IASI RADIANCES CHANNEL 57 : out of range
3 times in the last 10 days for at least one item
Severe: avg_fgdepar=-0.0364, expected range: -0.0110 0.0139
METOP-B IASI RADIANCES CHANNEL 141 : out of range
Severe: avg_fgdepar=-0.0346, expected range: -0.0082 0.0213
METOP-B IASI RADIANCES CHANNEL 161 : out of range
Considerable: avg_fgdepar=-0.0248, expected range: -0.0110 0.0156
cris
NOAA20 CRIS RADIANCES CHANNEL 115 : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=2913.0000, expected range: 2441.2219 2799.5781
airs
AQUA AIRS RADIANCES CHANNEL 128 : out of range
Severe: stdev_fgdepar=0.6663, expected range: 0.7437 0.7749
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 12 : out of range
Considerable: stdev_norm_fgdepar=0.6544, expected range: 0.4340 0.5796
atms
NPP ATMS RADIANCES CHANNEL 21 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2255, expected range: 0.1553 0.1757
NPP ATMS RADIANCES CHANNEL 19 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1401, expected range: 0.1067 0.1133
NOAA20 ATMS RADIANCES CHANNEL 21 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0367, expected range: -0.1162 -0.0844
NOAA20 ATMS RADIANCES CHANNEL 22 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.5981, expected range: 0.5112 0.5461
NOAA20 ATMS RADIANCES CHANNEL 15 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7678, expected range: 0.5538 0.6636
NOAA20 ATMS RADIANCES CHANNEL 19 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1322, expected range: -0.1660 -0.1489
amdar
ADS-C WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : missing
4 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 257.8311