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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-11-26 00:00

amsua
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
28 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6341, expected range: 0.5193 0.5844
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6358, expected range: 0.4818 0.5526
iasi
METOP-B IASI RADIANCES CHANNEL 290 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0740, expected range: 0.0910 0.1078
METOP-B IASI RADIANCES CHANNEL 1626 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1670, expected range: 0.1260 0.1464
METOP-C IASI RADIANCES CHANNEL 290 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0507, expected range: 0.0681 0.0863
METOP-C IASI RADIANCES CHANNEL 292 : out of range
32 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0762, expected range: -0.0537 -0.0418
METOP-C IASI RADIANCES (41 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.1122, expected range: -0.1867 -0.1480
METOP-B IASI RADIANCES (48 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.0493, expected range: -0.1187 -0.0764
cris
NOAA20 CRIS RADIANCES CHANNEL 109 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1112, expected range: -0.0987 -0.0877
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0129, expected range: 0.0432 0.0832
NOAA20 CRIS RADIANCES CHANNEL 125 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1136, expected range: -0.0915 -0.0660
NOAA20 CRIS RADIANCES CHANNEL 657 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1037, expected range: 0.0576 0.0820
airs
AQUA AIRS RADIANCES CHANNEL 201 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1350, expected range: -0.1195 -0.1039
AQUA AIRS RADIANCES CHANNEL 1471 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5885, expected range: -0.6903 -0.6483
Severely_persistent: avg_biascorr=-1.4300, expected range: -1.1404 -0.9461
AQUA AIRS RADIANCES CHANNEL 257 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.2724, expected range: -0.2589 -0.2333
atms
NPP ATMS RADIANCES CHANNEL 15 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7940, expected range: 0.6716 0.7345
NPP ATMS RADIANCES CHANNEL 12 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0586, expected range: -0.3359 -0.2732
NPP ATMS RADIANCES CHANNEL 13 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0214, expected range: -0.3353 -0.2363
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
42 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3625, expected range: -0.3045 -0.2519
Severely_persistent: avg_biascorr=-0.5480, expected range: -0.3951 -0.3198
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6567, expected range: -0.4598 -0.4283
NOAA20 ATMS RADIANCES (5 channels affected) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1065, expected range: -0.4574 -0.3344
NOAA20 ATMS RADIANCES CHANNEL 15 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7765, expected range: 0.5978 0.6617
NPP ATMS RADIANCES (5 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.3387, expected range: -0.2757 -0.1999
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 5 : out of range
1 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.0051, expected range: 0.0029 0.0040
scatt
HY-2B SCATTEROMETER WIND VECTOR DIFF (M/S) : out of range
Severe: avg_fgdepar=-0.6396, expected range: -0.2446 0.1536
resat
METOP-B GOME-2 OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-2.6497, expected range: -3.0597 -3.0320
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1-2 (HPA) : out of range
63 times in the last 10 days for at least one item
Slight: avg_fgdepar=-0.0176, expected range: -0.0058 -0.0058