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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-15 12:00

amsua
NOAA-15/AMSUA RADIANCES CHANNEL 9 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0657, expected range: 0.0758 0.0890
NOAA-19/AMSUA RADIANCES CHANNEL 8 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=1.3852, expected range: 0.6718 0.8381
Severely_persistent: avg_biascorr=2.0094, expected range: 2.4518 3.0317
METOP-B/AMSUA RADIANCES CHANNEL 9 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0973, expected range: 0.0371 0.0749
iasi
METOP-A/IASI RADIANCES CHANNEL 179 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1272, expected range: -0.0370 0.0639
METOP-B/IASI RADIANCES CHANNEL 178 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1961, expected range: 0.0810 0.0963
METOP-B/IASI RADIANCES CHANNEL 179 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2417, expected range: 0.1202 0.1767
METOP-C/IASI RADIANCES (25 channels affected) : out of range
Severe: avg_biascorr=0.1736, expected range: 0.1470 0.1579
cris
NPP/CRIS RADIANCES CHANNEL 622 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.2073, expected range: 0.0609 0.1272
NPP/CRIS RADIANCES CHANNEL 1181 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.6727, expected range: -0.1095 0.1408
NPP/CRIS RADIANCES CHANNEL 1189 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.6816, expected range: -0.1422 0.1834
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.9005, expected range: 0.0831 0.3528
NOAA20/CRIS RADIANCES CHANNEL 63 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3831, expected range: 0.3296 0.3602
NOAA20/CRIS RADIANCES CHANNEL 33 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2102, expected range: 0.1287 0.1623
NOAA20/CRIS RADIANCES CHANNEL 34 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3540, expected range: 0.2745 0.2922
NOAA20/CRIS RADIANCES CHANNEL 35 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3824, expected range: 0.3166 0.3449
NPP/CRIS RADIANCES (121 channels affected) : out of range
Severe: obs_number=8776.0000, expected range: 4157.4472 5467.5910
airs
AQUA/AIRS RADIANCES CHANNEL 138 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1068, expected range: 0.0083 0.0709
atms
NPP/ATMS RADIANCES (7 channels affected) : out of range
Considerable: obs_number=3569.0000, expected range: 2891.0136 3414.3753
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
4 times in the last 10 days for at least one item
Severe: obs_number=113130.0000, expected range: 20140.8537 33799.2574
GOES-15/IMAGER RADIANCES CHANNEL 3 : out of range
3 times in the last 10 days for at least one item
Severe: obs_number=36534.0000, expected range: 3562.4991 15725.9222
Severe: avg_fgdepar=-0.6807, expected range: -0.2116 0.2857
Radiosondes
All LAND TEMP WIND VECTOR DIFF (M/S) ALL LAYERS Missing
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: obs_number=97.0000, expected range: 181.2856 197.8909
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=140.0000, expected range: 0.0000 0.0000
Severely_persistent: avg_biascorr=0.9189, expected range: 0.0000 0.0000
buoy
MOORED BUOYS WIND VECTOR DIFF (M/S) : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=75.0000, expected range: 79.0832 95.3168