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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-10-03 06:00

iasi
METOP-B IASI RADIANCES (17 channels affected) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2748, expected range: 0.2135 0.2327
METOP-B IASI RADIANCES CHANNEL 51 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2677, expected range: 0.0315 0.1609
METOP-B IASI RADIANCES CHANNEL 57 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2257, expected range: 0.0355 0.1337
METOP-B IASI RADIANCES CHANNEL 63 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2128, expected range: 0.0004 0.1164
METOP-B IASI RADIANCES CHANNEL 83 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.5052, expected range: 0.2572 0.3973
METOP-B IASI RADIANCES CHANNEL 85 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3987, expected range: 0.1434 0.2746
METOP-B IASI RADIANCES CHANNEL 138 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2603, expected range: 0.2298 0.2415
METOP-B IASI RADIANCES CHANNEL 386 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0061, expected range: 0.0774 0.1271
METOP-C IASI RADIANCES CHANNEL 51 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2195, expected range: -0.0543 0.1003
METOP-C IASI RADIANCES CHANNEL 57 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1782, expected range: -0.0448 0.0719
METOP-C IASI RADIANCES CHANNEL 63 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1708, expected range: -0.0568 0.0525
METOP-C IASI RADIANCES CHANNEL 85 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3522, expected range: 0.0738 0.2312
METOP-C IASI RADIANCES CHANNEL 301 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0052, expected range: 0.0313 0.0589
METOP-C IASI RADIANCES CHANNEL 386 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0137, expected range: 0.0862 0.1212
METOP-C IASI RADIANCES (32 channels affected) : out of range
Severe: avg_biascorr=0.0732, expected range: 0.1173 0.1604
atms
NPP ATMS RADIANCES CHANNEL 12 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3039, expected range: -0.2795 -0.2509
Severely_persistent: avg_biascorr=-0.2897, expected range: -0.2117 -0.1689
NPP ATMS RADIANCES CHANNEL 9 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5774, expected range: -0.4736 -0.4595
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4017, expected range: -0.3201 -0.2956
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 17 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-2.4001, expected range: -2.8487 -2.6204
gpsro
All GRACE C GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 0.00 1102.61
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1010-1011 (HPA) : out of range
29 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.7471, expected range: 1.2927 1.9796
METOP-B GOME-2 OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6803, expected range: -0.8166 -0.7564
Slight: obs_number=29218.0000, expected range: 16210.9780 24241.8471
amdar
AMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : missing
Severe: obs_number=0.0000, expected range: 0.0000 291.5035