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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Early delivery 4D-VAR at 2019-09-18 18:00

iasi
All METOP-A/IASI RADIANCES ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 24870.28
METOP-B/IASI RADIANCES (209 channels affected) : out of range
Severe: obs_number=1399.0000, expected range: 2170.3097 2806.5621
METOP-B/IASI RADIANCES (51 channels affected) : out of range
Considerable: obs_number=2536.0000, expected range: 3358.8597 5544.4736
METOP-B/IASI RADIANCES CHANNEL 1658 : out of range
Considerable: avg_fgdepar=-0.0737, expected range: -0.0247 0.1565
METOP-C/IASI RADIANCES (236 channels affected) : out of range
Considerable: obs_number=38799.0000, expected range: 47447.3538 69996.1590
METOP-B/IASI RADIANCES CHANNEL 1479 : out of range
Slight: avg_fgdepar=-0.0636, expected range: -0.0286 0.1356
METOP-B/IASI RADIANCES CHANNEL 1513 : out of range
Slight: avg_fgdepar=-0.0428, expected range: -0.0161 0.1581
METOP-B/IASI RADIANCES CHANNEL 1521 : out of range
Slight: avg_fgdepar=-0.0429, expected range: -0.0137 0.1552
METOP-B/IASI RADIANCES CHANNEL 1639 : out of range
Slight: avg_fgdepar=-0.0699, expected range: -0.0346 0.1697
METOP-B/IASI RADIANCES CHANNEL 1652 : out of range
Slight: avg_fgdepar=-0.0654, expected range: -0.0233 0.1665
cris
All NPP/CRIS RADIANCES ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 4102.22 106395.78
gpsro
All TERRASAR-X SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1453.47
Atmospheric Motion Vector
METEOSAT-11/AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HP : out of range
4 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=2.3201, expected range: 0.2140 1.7898
Radiosondes
All DROP SONDE TEMPERATURE (K) ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 446.84
All HIGH RESO LAND TEMP TEMPERATURE (K) ALL LAYERS WMO BLOCK 71 : all data missing
Severe: obs_number=0, expected range: 0.00 344.41
All HIGH RESO SEA TEMP TEMPERATURE (K) ALL LAYERS North pole : all data missing
Severe: obs_number=0, expected range: 80.50 150.25
HIGH RESO SEA TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : missing
1 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 237.5648
amdar
AMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Slight: rms_fgdepar=3.7772, expected range: 1.7991 3.2889
synop
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
3 times in the last 10 days for at least one item
Severe: obs_number=81.0000, expected range: 82.0000 82.0000
MANUAL LAND SYNOP SURFACE PRESSURE (PA) : out of range
1 times in the last 10 days for at least one item
Considerable: rms_fgdepar=140.3150, expected range: 24.5136 99.4955
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-35.2174, expected range: -6.7688 7.4226