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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Early delivery 4D-VAR at 2019-06-19 06:00

airs
AQUA AIRS 56 radiances : OutOfRange
Slightly: avg(fg_depar)=0, expected range: -0.03 0.02
gpsro
All COSMIC-6 setting RO bending angles Missing
iasi
METOP-B IASI 921 radiances : OutOfRange
15 times in the last 10 days for at least one item
Slightly: avg(biascorr)=0, expected range: -0.27 -0.24
METOP-B IASI 867 radiances : OutOfRange
14 times in the last 10 days for at least one item
Slightly: avg(biascorr)=0, expected range: -0.27 -0.24
amdar
0YUENVBA 146 Temperature (k) 70000 101325 : OutOfRange
6 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=100, expected range: 0.00 75.00
0YUENVBA 146 Temperature (k) 40000 70000 : OutOfRange
6 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=100, expected range: 0.00 75.00
amsua
AQUA AMSU-A 9 radiances : OutOfRange
5 times in the last 10 days for at least one item
Considerably: stdev(norm_fg_depar)=0, expected range: 0.71 0.85
BUOYS
5601571 189 Surface pressure (Pa) : OutOfRange
19 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=71, expected range: 0.00 50.00
1601573 189 Surface pressure (Pa) : OutOfRange
3 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=80, expected range: 0.00 75.00
5601501 189 Surface pressure (Pa) : OutOfRange
7 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=83, expected range: 0.00 75.00
metar
K2W6 METAR Surface pressure (Pa) : OutOfRange
Severely: avg(fg_depar)=-83, expected range: -8.90 88.00
ship
3FQY9 SHIP Report Wind Vector difference (m/s) : OutOfRange
9 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=76, expected range: 0.00 50.00
VRPY6 SHIP Report Wind Vector difference (m/s) : OutOfRange
Considerably: freq(qc_pge)=100, expected range: 0.00 75.00
45174 Automatic SHIP Report Surface pressure (Pa) : OutOfRange
12 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=100, expected range: 0.00 75.00
synop
06252 170 Surface pressure (Pa) : OutOfRange
36 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=64, expected range: 0.00 50.00
26422 170 Surface pressure (Pa) : OutOfRange
1 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=100, expected range: 0.00 75.00