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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-09-17 00:00

amsua
METOP-B/AMSUA RADIANCES CHANNEL 6 : out of range
Slight: avg_fgdepar=0.0420, expected range: -0.0129 0.0345
iasi
METOP-A/IASI RADIANCES CHANNEL 515 : out of range
Considerable: avg_fgdepar=-0.0581, expected range: -0.0345 0.0391
METOP-A/IASI RADIANCES CHANNEL 546 : out of range
Considerable: avg_fgdepar=-0.0638, expected range: -0.0396 0.0411
METOP-A/IASI RADIANCES CHANNEL 571 : out of range
Considerable: avg_fgdepar=-0.0595, expected range: -0.0348 0.0383
METOP-A/IASI RADIANCES CHANNEL 552 : out of range
Slight: avg_fgdepar=-0.0489, expected range: -0.0406 0.0411
METOP-A/IASI RADIANCES CHANNEL 566 : out of range
Slight: avg_fgdepar=-0.0463, expected range: -0.0356 0.0396
METOP-A/IASI RADIANCES CHANNEL 573 : out of range
Slight: avg_fgdepar=-0.0530, expected range: -0.0395 0.0447
METOP-A/IASI RADIANCES CHANNEL 646 : out of range
Slight: avg_fgdepar=-0.0366, expected range: -0.0287 0.0387
cris
NPP/CRIS RADIANCES (149 channels affected) : out of range
Severe: obs_number=22481.0000, expected range: 97667.2431 149984.3569
mhs
ALLSKY METOP-A/MHS RADIANCES CHANNEL 3 : out of range
Slight: obs_number=44819.0000, expected range: 46691.2983 49887.6491
ALLSKY METOP-A/MHS RADIANCES CHANNEL 4 : out of range
Slight: obs_number=42968.0000, expected range: 44887.8875 47602.5336
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 4 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0092, expected range: 0.0112 0.0145
DMSP-18/SSMIS RADIANCES CHANNEL 5 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0090, expected range: 0.0111 0.0146
DMSP-18/SSMIS RADIANCES CHANNEL 3 : out of range
7 times in the last 10 days for at least one item
Slight: obs_number=13634.0000, expected range: 804.0430 11941.6293
gpsro
All TERRASAR-X SETTING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 0.00 1402.33
All TANDEM-X RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 0.00 1162.24
Atmospheric Motion Vector
METEOSAT-11/AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HP : out of range
Considerable: stdev_fgdepar=1.9028, expected range: 0.6038 1.4805
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (3 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=280.0000, expected range: 347.0797 422.8092
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 600-900 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: avg_fgdepar=1.9621, expected range: -0.5194 0.9982
amdar
All AMDAR TEMPERATURE (K) ALL LAYERS North West Pacific : all data missing
Severe: obs_number=0, expected range: 0.00 231.63
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
Severe: avg_biascorr=2.8580, expected range: 0.0000 0.0000
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=6.0156, expected range: 0.0000 0.0000