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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-14 12:00

amsua
METOP-C/AMSUA RADIANCES CHANNEL 7 : out of range
2 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.3130, expected range: 0.1325 0.1461
Slight: avg_fgdepar=0.0196, expected range: -0.0099 0.0092
METOP-B/AMSUA RADIANCES (9 channels affected) : out of range
Slight: obs_number=7891.0000, expected range: 8618.1907 14667.6175
iasi
METOP-A/IASI RADIANCES CHANNEL 5399 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4347, expected range: 0.2426 0.3319
METOP-A/IASI RADIANCES (53 channels affected) : out of range
Slight: avg_fgdepar=-0.0320, expected range: -0.0079 0.1169
cris
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.5135, expected range: 0.0709 0.3529
NPP/CRIS RADIANCES (45 channels affected) : out of range
Severe: obs_number=12787.0000, expected range: 7516.8528 8057.7195
NPP/CRIS RADIANCES (13 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_fgdepar=0.2803, expected range: 0.0009 0.1599
airs
AQUA/AIRS RADIANCES (13 channels affected) : out of range
Severe: avg_biascorr=0.3103, expected range: 0.3310 0.3669
Atmospheric Motion Vector
GOES-15/AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=620.0000, expected range: 0.0000 469.2187
GOES-15/AMV CLOUDY WV3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 ( : out of range
Slight: obs_number=754.0000, expected range: 149.4896 652.0660
Radiosondes
All LAND TEMP WIND VECTOR DIFF (M/S) ALL LAYERS Missing
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected : out of range
Severe: obs_number=192.0000, expected range: 277.4369 297.0075
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=132.0000, expected range: 193.6174 204.0493
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=105.0000, expected range: 0.0000 0.0000
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5814, expected range: 0.0000 0.0000
ship
AUTOMATIC SHIP SURFACE PRESSURE (PA) : out of range
6 times in the last 10 days for at least one item
Slight: obs_number=2006.0000, expected range: 1742.0240 1943.3894
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=5.6075, expected range: 0.0000 0.0000