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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2018-04-09 00:00

airs
AQUA AIRS 227 radiances : OutOfRange
15 times in the last 10 days for at least one item
Severely: avg(biascorr)=0, expected range: -0.57 -0.54
AQUA AIRS 1111 radiances : DataMissing
AQUA AIRS 224 radiances : OutOfRange
Slightly: avg(fg_depar)=0, expected range: -0.02 0.05
gpsro
All COSMIC-1 setting RO bending angles Missing
All COSMIC-1 rising RO bending angles Missing
iasi
382 METOP-B IASI 16 radiances have reduced counts (see example): OutOfRange
Severely: count(*)=10552, expected range: 14600.00 17400.00
mhs
NOAA-18 MHS 3 allsky radiances : OutOfRange
6 times in the last 10 days for at least one item
Slightly: avg(biascorr)=0, expected range: 0.32 0.54
Ozone
NOAA-19 SBUV layer ozone, top pressure 63940 : OutOfRange
9 times in the last 10 days for at least one item
Considerably: stdev_fg_depar_du=2, expected range: 1.04 2.27
ssmis
DMSP-18 SSMIS 7 allsky radiances : OutOfRange
8 times in the last 10 days for at least one item
Slightly: avg(biascorr)=5, expected range: 5.81 6.40
amdar
AFZA78 AMDAR Wind Vector difference (m/s) 0 40000 : OutOfRange
Severely: avg(fg_depar)=8, expected range: 0.73 5.90
IYHX4YBA 146 Temperature (k) 40000 70000 : OutOfRange
Severely: avg(fg_depar)=-1, expected range: -0.73 0.52
IRGSB3JA 146 Wind Vector difference (m/s) 0 40000 : OutOfRange
Considerably: freq(qc_pge)=75, expected range: 0.00 70.00
R2YY1YRA 146 Wind Vector difference (m/s) 0 40000 : OutOfRange
Considerably: freq(qc_pge)=100, expected range: 0.00 70.00
In-Situ measurements
Land Automatic Report Surface pressure (Pa) 01 0 0 : OutOfRange
1 times in the last 10 days for at least one item
Severely: count(*)=100, expected range: -2.60 21.00
All Land Automatic Report Surface pressure (Pa) WMO BLOCK 62 0 0 Missing
All SYNOP Surface pressure (Pa) WMO BLOCK 92 0 0 Missing
All PILOT Wind Vector difference (m/s) WMO BLOCK 70 0 40000 Missing
All European Wind Profiler Wind Vector difference (m/s) WMO BLOCK 11 0 400 Missing
All TEMP Land Report Temperature (k) WMO BLOCK 62 0 40000 Missing
All TEMP Land Report Temperature (k) WMO BLOCK 62 40000 70000 Missing
All TEMP Land Report Temperature (k) WMO BLOCK 62 70000 101325 Missing
All TEMP Land Report Temperature (k) WMO BLOCK 65 70000 101325 Missing
All TEMP Land Report Temperature (k) WMO BLOCK 73 0 40000 Missing
All TEMP Land Report Temperature (k) WMO BLOCK 73 40000 70000 Missing
All TEMP Land Report Temperature (k) WMO BLOCK 73 70000 101325 Missing
TEMP Land Report Temperature (k) WMO BLOCK 17 70000 101325 : OutOfRange
Considerably: rms(fg_depar)=3, expected range: 0.00 2.20
Slightly: avg(fg_depar)=-1, expected range: -0.90 0.88
Drifter Buoy Surface pressure (Pa) WMO BLOCK 71 0 0 : OutOfRange
Slightly: count(*)=84, expected range: 86.00 154.00
TEMP Land Report Temperature (k) WMO BLOCK 68 70000 101325 : OutOfRange
Slightly: avg(fg_depar)=-1, expected range: -1.24 1.30
Slightly: rms(fg_depar)=3, expected range: 0.00 2.60
BUOYS
1501511 189 Surface pressure (Pa) : OutOfRange
Considerably: freq(qc_pge)=91, expected range: 0.00 70.00
1501513 189 Surface pressure (Pa) : OutOfRange
Considerably: freq(qc_pge)=75, expected range: 0.00 70.00
4400765 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 70.00
metar
SBMA METAR Surface pressure (Pa) : OutOfRange
Severely: rms(fg_depar)=352, expected range: 0.00 199.00
MHTG METAR Surface pressure (Pa) : OutOfRange
Severely: rms(fg_depar)=230, expected range: 0.00 130.00
LMML METAR Surface pressure (Pa) : OutOfRange
1 times in the last 10 days for at least one item
Severely: rms(fg_depar)=209, expected range: 0.00 107.00
CWSA METAR Surface pressure (Pa) : OutOfRange
Considerably: freq(qc_pge)=71, expected range: 0.00 70.00
KDYA METAR Surface pressure (Pa) : OutOfRange
2 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=87, expected range: 0.00 70.00
ship
ZCDI4 SHIP Report Wind Vector difference (m/s) : OutOfRange
7 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=58, expected range: 0.00 50.00
V7UU2 SHIP Report Surface pressure (Pa) : OutOfRange
Severely_persistent: freq(qc_pge)=52, expected range: 0.00 50.00
CGCB Automatic SHIP Report Surface pressure (Pa) : OutOfRange
Severely: rms(fg_depar)=256, expected range: 0.00 160.00
42059 Automatic SHIP Report Surface pressure (Pa) : 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
40942 SYNOP Surface pressure (Pa) : OutOfRange
19 times in the last 10 days for at least one item
Severely_persistent: freq(qc_pge)=100, expected range: 0.00 50.00
89646 Land Automatic Report Surface pressure (Pa) : OutOfRange
1 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=77, expected range: 0.00 70.00
42273 SYNOP Surface pressure (Pa) : OutOfRange
Considerably: freq(qc_pge)=75, expected range: 0.00 70.00
16405 170 Surface pressure (Pa) : OutOfRange
Considerably: freq(qc_pge)=75, expected range: 0.00 70.00
71595 170 Surface pressure (Pa) : OutOfRange
3 times in the last 10 days for at least one item
Considerably: freq(qc_pge)=100, expected range: 0.00 70.00
Radiosondes
72214 109 Temperature (k) 40000 70000 : OutOfRange
Severely: avg(fg_depar)=-2, expected range: -0.69 1.06
Severely: rms(fg_depar)=2, expected range: 0.00 1.66
10548 109 Q (g/kg) 70000 101325 : OutOfRange
Severely: rms(fg_depar)=0, expected range: 0.00 0.00
71816 109 Q (g/kg) 0 40000 : OutOfRange
Severely: rms(fg_depar)=0, expected range: 0.00 0.00
17281 109 Temperature (k) 70000 101325 : OutOfRange
Severely: avg(fg_depar)=-6, expected range: -2.90 2.40
Severely: rms(fg_depar)=7, expected range: 0.00 2.90
23078 TEMP Land Report Q (g/kg) 70000 101325 : OutOfRange
Severely: rms(fg_depar)=0, expected range: 0.00 0.00
60715 TEMP Land Report Temperature (k) 40000 70000 : OutOfRange
Severely: rms(fg_depar)=2, expected range: 0.00 1.65
32150 TEMP Land Report Temperature (k) 40000 70000 : OutOfRange
Considerably: freq(qc_pge)=100, expected range: 0.00 70.00