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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-09-12 00:00

amsua
AQUA/AMSUA RADIANCES CHANNEL 11 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1884, expected range: 0.2386 0.3211
METOP-C/AMSUA RADIANCES CHANNEL 11 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1049, expected range: -0.0058 0.1078
AQUA/AMSUA RADIANCES CHANNEL 10 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1244, expected range: 0.1702 0.2514
NOAA-15/AMSUA RADIANCES CHANNEL 5 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.1184, expected range: 0.1386 0.2144
iasi
METOP-A/IASI RADIANCES CHANNEL 125 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1559, expected range: 0.1987 0.2710
METOP-A/IASI RADIANCES CHANNEL 131 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2305, expected range: 0.2801 0.3534
METOP-A/IASI RADIANCES CHANNEL 195 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2886, expected range: 0.3262 0.3974
METOP-B/IASI RADIANCES CHANNEL 59 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.5647, expected range: 0.6066 0.6818
METOP-B/IASI RADIANCES CHANNEL 195 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4477, expected range: 0.4794 0.5421
METOP-C/IASI RADIANCES CHANNEL 6458 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.4030, expected range: 3.3805 5.2626
METOP-B/IASI RADIANCES (50 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.7497, expected range: -0.1278 0.3851
METOP-C/IASI RADIANCES (53 channels affected) : out of range
Severe: avg_biascorr=0.7243, expected range: -0.1962 0.3561
METOP-A/IASI RADIANCES CHANNEL 85 : out of range
Considerable: stdev_fgdepar=0.3217, expected range: 0.3847 0.6066
cris
NPP/CRIS RADIANCES (322 channels affected) : out of range
Severe: obs_number=22391.0000, expected range: 120330.3096 128670.6093
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 4 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0104, expected range: 0.0122 0.0136
DMSP-18/SSMIS RADIANCES CHANNEL 5 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0103, expected range: 0.0121 0.0136
DMSP-18/SSMIS RADIANCES CHANNEL 3 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=11568.0000, expected range: 3210.0736 9301.1385
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=3163.0000, expected range: 5996.6241 6617.2039
Radiosondes
All DROP SONDE WIND VECTOR DIFF (M/S) ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 543.66
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1172, expected range: 0.0506 0.0840
amdar
All AMDAR TEMPERATURE (K) ALL LAYERS North West Pacific : all data missing
Severe: obs_number=0, expected range: 0.00 233.71
synop
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=542.0000, expected range: 688.2259 893.1075
ship
AUTOMATIC SHIP SURFACE PRESSURE (PA) : out of range
Severe: avg_biascorr=-110.0000, expected range: 0.0000 0.0000
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.6420, expected range: 0.0000 0.0000