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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2018-03-12 12:00

airs
AQUA AIRS 310 radiances : OutOfRange
11 times in the last 10 days for at least one item
Considerably: avg(biascorr)=0, expected range: -0.82 -0.78
gpsro
All COSMIC-6 setting RO bending angles Missing
ssmis
DMSP-18 SSMIS 3 allsky radiances : OutOfRange
1 times in the last 10 days for at least one item
Slightly: avg(norm_fg_depar)=0, expected range: -0.00 0.01
In-Situ measurements
All Drifter Buoy Surface pressure (Pa) WMO BLOCK 25 0 0 Missing
PILOT Wind Vector difference (m/s) WMO BLOCK 97 0 40000 : OutOfRange
Slightly: count(*)=117, expected range: -47.00 108.00
TEMP Land Report Temperature (k) WMO BLOCK 96 0 40000 : OutOfRange
Slightly: rms(fg_depar)=0, expected range: 1.01 2.10
TEMP Land Report Temperature (k) WMO BLOCK 97 0 40000 : OutOfRange
Slightly: rms(fg_depar)=0, expected range: 0.81 2.40
BUOYS
3301530 189 Surface pressure (Pa) : OutOfRange
Considerably: freq(qc_pge)=100, expected range: 0.00 70.00
4802004 189 Surface pressure (Pa) : OutOfRange
2 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=90, expected range: 0.00 70.00
2301556 189 Surface pressure (Pa) : OutOfRange
4 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=90, expected range: 0.00 70.00
metar
KTIX METAR Surface pressure (Pa) : OutOfRange
Severely: rms(fg_depar)=301, expected range: 0.00 100.00
pilot
42182 PILOT Wind Vector difference (m/s) 0 40000 : OutOfRange
3 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=75, expected range: 0.00 70.00
ship
VOLG Automatic SHIP Report Wind Vector difference (m/s) : OutOfRange
6 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=56, expected range: 0.00 50.00
SBPQ Automatic SHIP Report Surface pressure (Pa) : OutOfRange
15 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=77, expected range: 0.00 50.00
WCX7445 SHIP Report Wind Vector difference (m/s) : OutOfRange
Considerably: freq(qc_pge)=75, expected range: 0.00 70.00
42365 Automatic SHIP Report Wind Vector difference (m/s) : OutOfRange
Considerably: freq(qc_pge)=100, expected range: 0.00 70.00
V7YW5 SHIP Report Wind Vector difference (m/s) : OutOfRange
Considerably: freq(qc_pge)=71, expected range: 0.00 70.00
VRRB6 SHIP Report Wind Vector difference (m/s) : OutOfRange
5 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=100, expected range: 0.00 70.00
synop
76773 SYNOP Surface pressure (Pa) : OutOfRange
1 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=66, expected range: 0.00 50.00
04158 170 Surface pressure (Pa) : OutOfRange
18 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=93, expected range: 0.00 50.00
93831 170 Surface pressure (Pa) : OutOfRange
Considerably: freq(qc_pge)=100, expected range: 0.00 70.00
30493 170 Surface pressure (Pa) : OutOfRange
1 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=75, expected range: 0.00 70.00
28984 SYNOP 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 70.00
Radiosondes
12120 109 Q (g/kg) 0 40000 : OutOfRange
Severely: rms(fg_depar)=0, expected range: 0.00 0.00
78762 TEMP Land Report Q (g/kg) 0 40000 : OutOfRange
Severely: avg(fg_depar)=0, expected range: -0.00 0.00
Severely: rms(fg_depar)=0, expected range: 0.00 0.00
02963 109 Q (g/kg) 0 40000 : OutOfRange
Severely: rms(fg_depar)=0, expected range: 0.00 0.00
78016 TEMP Land Report Temperature (k) 0 40000 : OutOfRange
Severely: rms(fg_depar)=3, expected range: 0.30 2.10