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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-09-19 00:00

amsua
METOP-A/AMSUA RADIANCES CHANNEL 9 : out of range
Considerable: avg_biascorr=0.2459, expected range: 0.2647 0.3131
iasi
All METOP-A/IASI RADIANCES ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 0.00 28049.68
METOP-B/IASI RADIANCES (395 channels affected) : out of range
Severe: obs_number=9962.0000, expected range: 21461.7931 22965.8911
METOP-C/IASI RADIANCES (393 channels affected) : out of range
Severe: obs_number=57602.0000, expected range: 117606.9018 125596.9901
METOP-B/IASI RADIANCES (49 channels affected) : out of range
Considerable: avg_fgdepar=0.0202, expected range: 0.0427 0.1016
METOP-B/IASI RADIANCES (52 channels affected) : out of range
Considerable: avg_biascorr=0.7952, expected range: 0.5238 0.7340
cris
All NPP/CRIS RADIANCES ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 95421.74 148502.90
atms
NOAA20/ATMS RADIANCES (7 channels affected) : out of range
Considerable: obs_number=3768.0000, expected range: 3090.7409 3631.2036
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 4 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0088, expected range: 0.0112 0.0145
DMSP-18/SSMIS RADIANCES CHANNEL 5 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0087, expected range: 0.0111 0.0146
DMSP-18/SSMIS RADIANCES CHANNEL 2 : out of range
Slight: obs_number=12122.0000, expected range: 2456.4172 11086.4237
gpsro
All TERRASAR-X SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1405.42
All TANDEM-X RISING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1116.87
METOP-B/GRAS SETTING HEIGHT 18 : out of range
Slight: obs_number=1043.0000, expected range: 819.2295 1022.2299
METOP-B/GRAS SETTING HEIGHT 23 : out of range
Slight: obs_number=1212.0000, expected range: 959.9238 1185.8540
Atmospheric Motion Vector
METEOSAT-11/AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HP : out of range
Slight: avg_press=935.2976, expected range: 913.4935 932.9207
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
Severe: obs_number=181.0000, expected range: 87.2810 94.4690
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
Severe: obs_number=126.0000, expected range: 58.3194 69.5556
All HIGH RESO SEA TEMP TEMPERATURE (K) ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 0.00 979.09
synop
BUFR LAND SYNOP RH2M (%) : out of range
Severe: obs_number=121.0000, expected range: 122.0000 122.0000
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=193.0000, expected range: 195.0000 195.0000
MANUAL LAND SYNOP Z (M) : out of range
1 times in the last 10 days for at least one item
Slight: rms_fgdepar=194.6937, expected range: 121.9571 179.9579
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-27.8929, expected range: -5.4585 5.8295
Considerable: obs_number=308.0000, expected range: 323.1521 365.2689