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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-05-10 00:00

iasi
METOP-A IASI RADIANCES CHANNEL 256 : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2931, expected range: -0.2713 -0.2596
METOP-A IASI RADIANCES CHANNEL 236 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0259, expected range: -0.0045 -0.0040
METOP-A IASI RADIANCES CHANNEL 249 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1923, expected range: -0.1708 -0.1483
METOP-B IASI RADIANCES CHANNEL 249 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1371, expected range: -0.1174 -0.1047
METOP-B IASI RADIANCES CHANNEL 256 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2348, expected range: -0.2109 -0.2066
cris
NPP CRIS RADIANCES CHANNEL 94 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1024, expected range: 0.1229 0.1273
NPP CRIS RADIANCES CHANNEL 120 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0642, expected range: -0.0534 -0.0477
NPP CRIS RADIANCES CHANNEL 126 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0729, expected range: -0.0621 -0.0591
NPP CRIS RADIANCES CHANNEL 141 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0723, expected range: -0.0645 -0.0643
NPP CRIS RADIANCES CHANNEL 110 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0186, expected range: 0.0227 0.0233
NOAA20 CRIS RADIANCES (19 channels affected) : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0124, expected range: 0.0245 0.0255
NOAA20 CRIS RADIANCES CHANNEL 92 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1671, expected range: 0.1857 0.1860
NOAA20 CRIS RADIANCES CHANNEL 93 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1493, expected range: 0.1656 0.1708
NOAA20 CRIS RADIANCES CHANNEL 101 : out of range
31 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0839, expected range: 0.1038 0.1085
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0451, expected range: 0.0597 0.0672
NOAA20 CRIS RADIANCES CHANNEL 122 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0021, expected range: 0.0112 0.0217
airs
AQUA AIRS RADIANCES CHANNEL 221 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.8303, expected range: -0.7566 -0.7344
AQUA AIRS RADIANCES CHANNEL 232 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7774, expected range: -0.7164 -0.6746
AQUA AIRS RADIANCES (16 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=477.0000, expected range: 775.3355 775.3355
Atmospheric Motion Vector
GOES-16 AMV VIS1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HPA) : out of range
1 times in the last 10 days for at least one item
Severe: stdev_fgdepar=1.2266, expected range: 0.7677 0.9436
GOES-17 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
4 times in the last 10 days for at least one item
Severe: stdev_press=67.4309, expected range: 75.3907 81.5270
METEOSAT-11 AMV IR3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=2665.0000, expected range: 1125.4778 2016.5222
METEOSAT-8 AMV VIS2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA : out of range
1 times in the last 10 days for at least one item
Slight: stdev_press=54.3877, expected range: 50.1424 50.9588