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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-09-08 00:00

iasi
METOP-C/IASI RADIANCES CHANNEL 6458 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.0552, expected range: 3.3805 5.2626
METOP-B/IASI RADIANCES (41 channels affected) : out of range
Severe: avg_biascorr=0.6909, expected range: -0.1278 0.3851
METOP-C/IASI RADIANCES (46 channels affected) : out of range
Severe: avg_biascorr=0.6830, expected range: -0.1962 0.3561
cris
NPP/CRIS RADIANCES CHANNEL 749 : out of range
66 times in the last 10 days for at least one item
Severely_persistent: obs_number=6172.0000, expected range: 0.0000 204.1484
NPP/CRIS RADIANCES CHANNEL 845 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: obs_number=5546.0000, expected range: 0.0000 525.1684
NPP/CRIS RADIANCES CHANNEL 1085 : out of range
57 times in the last 10 days for at least one item
Severely_persistent: obs_number=20308.0000, expected range: 0.0000 447.2227
NPP/CRIS RADIANCES CHANNEL 1173 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: obs_number=21606.0000, expected range: 0.0000 7041.9806
mhs
ALLSKY NOAA-19/MHS RADIANCES (5 channels affected) : out of range
Severe: obs_number=15801.0000, expected range: 26300.0483 33031.0073
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 4 : out of range
2 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.0113, expected range: 0.0122 0.0136
DMSP-18/SSMIS RADIANCES CHANNEL 5 : out of range
2 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.0112, expected range: 0.0121 0.0136
DMSP-18/SSMIS RADIANCES CHANNEL 3 : out of range
Slight: obs_number=9864.0000, expected range: 3748.7342 9301.1385
Radiosondes
All DROP SONDE TEMPERATURE (K) ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 0.00 701.05
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
Severe: obs_number=573.0000, expected range: 652.2311 680.2133
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 600-900 (HPA) : out of range
Considerable: obs_number=71.0000, expected range: 80.6208 103.6014
amdar
AMDAR TEMPERATURE (K) PRESSURE LAYER 600-900 (HPA) : missing
4 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 219.4531
All WIGOS AMDAR Q (G/KG) ALL LAYERS Tropics : all data missing
Severe: obs_number=0, expected range: 0.00 168.82
synop
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
11 times in the last 10 days for at least one item
Severely_persistent: obs_number=114.0000, expected range: 127.7669 142.1155
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
Slight: obs_number=8707.0000, expected range: 9016.8304 10147.1696