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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-11-27 18:00

amsua
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
34 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6360, expected range: 0.5303 0.5858
iasi
METOP-B IASI RADIANCES CHANNEL 1639 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1009, expected range: 0.0131 0.0546
METOP-B IASI RADIANCES CHANNEL 1521 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0234, expected range: -0.1080 -0.0696
METOP-B IASI RADIANCES CHANNEL 1513 : out of range
26 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0291, expected range: -0.1028 -0.0675
METOP-B IASI RADIANCES (38 channels affected) : out of range
Considerable: avg_biascorr=-0.0452, expected range: -0.1196 -0.0764
METOP-B IASI RADIANCES (17 channels affected) : out of range
Considerable: avg_biascorr=0.0787, expected range: 0.0910 0.1090
METOP-C IASI RADIANCES CHANNEL 178 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.2973, expected range: 0.2414 0.2777
METOP-C IASI RADIANCES CHANNEL 101 : out of range
2 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.3511, expected range: 0.2688 0.3194
METOP-C IASI RADIANCES (11 channels affected) : out of range
Considerable: avg_biascorr=0.0591, expected range: 0.0681 0.0844
cris
NOAA20 CRIS RADIANCES CHANNEL 661 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0800, expected range: -0.2946 -0.1934
NOAA20 CRIS RADIANCES CHANNEL 618 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0389, expected range: -0.1476 -0.0864
NOAA20 CRIS RADIANCES CHANNEL 590 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0470, expected range: -0.3616 -0.1927
NOAA20 CRIS RADIANCES CHANNEL 409 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0071, expected range: -0.4197 -0.2016
NOAA20 CRIS RADIANCES CHANNEL 109 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1099, expected range: -0.0987 -0.0843
NOAA20 CRIS RADIANCES CHANNEL 963 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0350, expected range: -0.1009 -0.0713
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=0.7935, expected range: 0.6692 0.7345
NPP ATMS RADIANCES CHANNEL 13 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0082, expected range: -0.3457 -0.2363
NPP ATMS RADIANCES CHANNEL 12 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0792, expected range: -0.3561 -0.2732
NPP ATMS RADIANCES CHANNEL 14 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0875, expected range: -0.2091 -0.0619
NOAA20 ATMS RADIANCES CHANNEL 13 : out of range
36 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6193, expected range: -0.4598 -0.4227
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
72 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5179, expected range: -0.3951 -0.3524
Severely_persistent: avg_biascorr=-0.3578, expected range: -0.3045 -0.2670
NOAA20 ATMS RADIANCES CHANNEL 15 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7643, expected range: 0.5957 0.6617
NPP ATMS RADIANCES (5 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.2485, expected range: -0.0884 -0.0008
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 5 : out of range
4 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.0054, expected range: 0.0026 0.0040
Atmospheric Motion Vector
GOES-17 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Slight: stdev_fgdepar=2.5393, expected range: 1.9607 2.3303
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 142336.65
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1010-1011 (HPA) : out of range
19 times in the last 10 days for at least one item
Slight: avg_fgdepar=-3.5527, expected range: -4.5081 -3.8052
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1-2 (HPA) : out of range
57 times in the last 10 days for at least one item
Slight: avg_fgdepar=-0.0149, expected range: -0.0058 -0.0058