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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Delayed cut-off 4DVAR at 2018-03-09 00:00

airs
AQUA AIRS 310 radiances : OutOfRange
4 times in the last 10 days for at least one item
Slightly: avg(biascorr)=0, expected range: -0.82 -0.76
ssmis
DMSP-17 SSMIS 17 allsky radiances : OutOfRange
1 times in the last 10 days for at least one item
Slightly: avg(biascorr)=-1, expected range: -2.70 -1.95
amdar
GQKUILBA 146 Wind Vector difference (m/s) 0 40000 : OutOfRange
Severely: avg(fg_depar)=14, expected range: -0.86 8.30
Severely: rms(fg_depar)=18, expected range: 0.00 9.10
YZJZBJJA 146 Temperature (k) 0 40000 : OutOfRange
Severely: rms(fg_depar)=3, expected range: 0.00 1.52
AU0174 AMDAR Temperature (k) 40000 70000 : OutOfRange
Severely: rms(fg_depar)=4, expected range: 0.00 1.68
AU0148 AMDAR Temperature (k) 40000 70000 : OutOfRange
Severely: rms(fg_depar)=3, expected range: 0.00 1.37
JP9Z4X59 AMDAR Temperature (k) 70000 101325 : OutOfRange
Considerably: freq(qc_pge)=80, expected range: 0.00 70.00
In-Situ measurements
Land Automatic Report Surface pressure (Pa) WMO BLOCK 68 0 0 : OutOfRange
1 times in the last 10 days for at least one item
Severely: count(*)=348, expected range: 450.00 520.00
All European Wind Profiler Wind Vector difference (m/s) WMO BLOCK 11 0 400 Missing
All AIREP Wind Vector difference (m/s) Asia 70000 101325 Missing
All AIREP Wind Vector difference (m/s) Indian Ocean 70000 101325 Missing
All Drifter Buoy Surface pressure (Pa) WMO BLOCK 25 0 0 Missing
All TEMP Land Report Temperature (k) WMO BLOCK 65 70000 101325 Missing
SYNOP Surface pressure (Pa) WMO BLOCK 37 0 0 : OutOfRange
Considerably: rms(fg_depar)=238, expected range: 17.60 174.00
SYNOP Surface pressure (Pa) WMO BLOCK 63 0 0 : OutOfRange
1 times in the last 10 days for at least one item
Slightly: rms(fg_depar)=272, expected range: 0.00 260.00
metar
MGPB METAR Surface pressure (Pa) : OutOfRange
Severely: rms(fg_depar)=304, expected range: 0.00 90.00
EQYB METAR Surface pressure (Pa) : OutOfRange
Severely: rms(fg_depar)=149, expected range: 0.00 75.00
PAIW METAR Surface pressure (Pa) : OutOfRange
Severely: rms(fg_depar)=314, expected range: 0.00 193.00
ship
VRID6 SHIP Report Surface pressure (Pa) : OutOfRange
6 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=59, expected range: 0.00 50.00
V7UU4 SHIP Report Wind Vector difference (m/s) : OutOfRange
1 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=100, expected range: 0.00 70.00
9HA3667 SHIP Report Wind Vector difference (m/s) : OutOfRange
2 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=85, expected range: 0.00 70.00
SDIA Automatic SHIP Report Wind Vector difference (m/s) : OutOfRange
Considerably: freq(qc_pge)=83, expected range: 0.00 70.00
PCHM SHIP Report Wind Vector difference (m/s) : OutOfRange
Considerably: freq(qc_pge)=100, expected range: 0.00 70.00
synop
40942 SYNOP Surface pressure (Pa) : OutOfRange
6 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=100, expected range: 0.00 50.00
04158 170 Surface pressure (Pa) : OutOfRange
17 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=94, expected range: 0.00 50.00
91573 170 Surface pressure (Pa) : OutOfRange
Severely: rms(fg_depar)=125, expected range: 0.00 74.00
89014 Land Automatic Report Surface pressure (Pa) : OutOfRange
3 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=91, expected range: 0.00 70.00
Radiosondes
72776 109 Q (g/kg) 40000 70000 : OutOfRange
Severely: rms(fg_depar)=0, expected range: 0.00 0.00