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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 8 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=1.0678, expected range: 0.6651 0.8381
Severely_persistent: avg_biascorr=1.8822, expected range: 2.4518 2.9554
METOP-B/AMSUA RADIANCES CHANNEL 9 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0975, expected range: 0.0382 0.0749
METOP-C/AMSUA RADIANCES CHANNEL 7 : out of range
3 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.1787, expected range: 0.1452 0.1624
iasi
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=0.1727, expected range: 0.0823 0.0963
METOP-C/IASI RADIANCES CHANNEL 178 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1396, expected range: 0.0323 0.0668
METOP-C/IASI RADIANCES CHANNEL 179 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1821, expected range: 0.0824 0.1292
METOP-B/IASI RADIANCES (261 channels affected) : out of range
Severe: obs_number=14563.0000, expected range: 20246.0001 22733.5675
METOP-A/IASI RADIANCES (142 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0704, expected range: 0.0389 0.0615
cris
NPP/CRIS RADIANCES CHANNEL 622 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.2524, expected range: 0.0599 0.1272
NPP/CRIS RADIANCES CHANNEL 1181 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.8805, expected range: -0.1095 0.1408
NPP/CRIS RADIANCES CHANNEL 1189 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.4524, expected range: -0.1422 0.1834
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=3.4964, 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=0.3826, expected range: 0.3299 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=0.2009, expected range: 0.1296 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=0.3410, expected range: 0.2747 0.2922
NOAA20/CRIS RADIANCES CHANNEL 35 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3717, expected range: 0.3149 0.3449
NPP/CRIS RADIANCES (132 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=8408.0000, expected range: 4079.2497 5467.5910
NOAA20/CRIS RADIANCES (49 channels affected) : out of range
2 times in the last 10 days for at least one item
Slight: obs_number=22701.0000, expected range: 22918.3788 23367.3435
airs
AQUA/AIRS RADIANCES CHANNEL 10 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.5422, expected range: 0.3760 0.4722
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 6 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: obs_number=1827.0000, expected range: 289.2595 1090.6361
DMSP-18/SSMIS RADIANCES CHANNEL 7 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: obs_number=1833.0000, expected range: 291.3225 1101.9719
DMSP-18/SSMIS RADIANCES CHANNEL 10 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: obs_number=1820.0000, expected range: 279.8679 1079.4379
DMSP-18/SSMIS RADIANCES CHANNEL 11 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: obs_number=1818.0000, expected range: 280.4421 1080.6563
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 3 : out of range
2 times in the last 10 days for at least one item
Severe: avg_fgdepar=0.6983, expected range: -0.2088 0.2822
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
3 times in the last 10 days for at least one item
Slight: avg_fgdepar=1.1968, expected range: -1.0782 0.9481
Radiosondes
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected : out of range
Considerable: obs_number=256.0000, expected range: 296.8771 388.9979
synop
MANUAL LAND SYNOP SURFACE PRESSURE (PA) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=103.0000, expected range: 120.8205 140.2906
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=2453.0000, expected range: 2621.6447 3070.4664
ship
AUTOMATIC SHIP SURFACE PRESSURE (PA) : out of range
5 times in the last 10 days for at least one item
Slight: obs_number=4471.0000, expected range: 3876.6130 4278.2441
metar
AUTOMATIC METAR SURFACE PRESSURE (PA) : out of range
Considerable: avg_biascorr=0.0000, expected range: 341.6666 967.9253