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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-09 12:00

iasi
METOP-C/IASI RADIANCES CHANNEL 97 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1735, expected range: -0.0482 0.0824
METOP-A/IASI RADIANCES (298 channels affected) : out of range
Severe: obs_number=60614.0000, expected range: 9008.8407 12039.6831
METOP-A/IASI RADIANCES CHANNEL 3248 : out of range
Considerable: avg_fgdepar=-0.0982, expected range: -0.0624 0.0632
METOP-A/IASI RADIANCES (70 channels affected) : out of range
Slight: stdev_fgdepar=0.2414, expected range: 0.2189 0.2383
cris
NPP/CRIS RADIANCES CHANNEL 622 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.3127, expected range: -0.0593 0.0908
NPP/CRIS RADIANCES CHANNEL 1157 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-2.7073, expected range: -0.2214 0.2316
NPP/CRIS RADIANCES CHANNEL 1181 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.2752, expected range: -0.1088 0.1113
NPP/CRIS RADIANCES (209 channels affected) : out of range
Severe: avg_biascorr=0.2298, expected range: 0.2493 0.2644
NPP/CRIS RADIANCES CHANNEL 1213 : out of range
3 times in the last 10 days for at least one item
Severe: obs_number=13340.0000, expected range: 1477.8705 7438.8032
Radiosondes
All HIGH RESO SEA TEMP TEMPERATURE (K) ALL LAYERS Alantic Tropical are : all data missing
Severely_persistent: obs_number=0, expected range: 65.62 139.58
All HIGH RESO SEA TEMP WIND VECTOR DIFF (M/S) ALL LAYERS Alantic Tropical are : all data missing
Severely_persistent: obs_number=0, expected range: 65.62 139.58
All HIGH RESO SEA TEMP Q (G/KG) ALL LAYERS Alantic Tropical are : all data missing
Severely_persistent: obs_number=0, expected range: 47.56 65.84
All LAND TEMP WIND VECTOR DIFF (M/S) ALL LAYERS WMO BLOCK 8 : all data missing
Severe: obs_number=0, expected range: 31.99 78.01
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
Severe: obs_number=203.0000, expected range: 359.3719 381.1281
Considerable: avg_fgdepar=0.6589, expected range: 0.0178 0.4291
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 900-1200 (HPA) : out of range
Severe: avg_biascorr=-0.0124, expected range: -0.0019 0.0024
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected : out of range
3 times in the last 10 days for at least one item
Severe: obs_number=279.0000, expected range: 357.9002 381.9748
HIGH RESO LAND TEMP Q (G/KG) (2 pressure layers affected) : out of range
Severe: obs_number=203.0000, expected range: 337.7631 399.8619
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=110.0000, expected range: 0.0000 0.0000
Severely_persistent: avg_biascorr=0.7373, expected range: 0.0000 0.0000
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-7.8571, expected range: 0.0000 0.0000
MANUAL LAND SYNOP SURFACE PRESSURE (PA) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=64.0000, expected range: 71.2371 79.0962