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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-11-25 00:00

amsua
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6696, expected range: 0.4990 0.5914
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 9 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0040, expected range: 0.0030 0.0035
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6622, expected range: 0.5000 0.5903
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6113, expected range: 0.4846 0.5435
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 14 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.6352, expected range: 0.4747 0.5504
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 10 : out of range
2 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.9694, expected range: 0.7931 0.8934
iasi
METOP-B IASI RADIANCES CHANNEL 1626 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1350, expected range: 0.0797 0.1101
METOP-B IASI RADIANCES CHANNEL 5401 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4124, expected range: 0.2095 0.2807
METOP-B IASI RADIANCES CHANNEL 5403 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4308, expected range: 0.1912 0.3147
METOP-C IASI RADIANCES CHANNEL 128 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2358, expected range: 0.2569 0.2712
METOP-C IASI RADIANCES CHANNEL 5401 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4356, expected range: 0.2420 0.3197
METOP-C IASI RADIANCES CHANNEL 5403 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4340, expected range: 0.2319 0.3206
METOP-B IASI RADIANCES (46 channels affected) : out of range
Severe: stdev_fgdepar=0.2109, expected range: 0.2347 0.2440
METOP-C IASI RADIANCES (42 channels affected) : out of range
Severe: stdev_fgdepar=0.2094, expected range: 0.2285 0.2427
METOP-C IASI RADIANCES CHANNEL 1626 : out of range
1 times in the last 10 days for at least one item
Slight: avg_fgdepar=-0.0797, expected range: -0.0482 0.0767
cris
NOAA20 CRIS RADIANCES CHANNEL 965 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1770, expected range: -0.2206 -0.2076
NOAA20 CRIS RADIANCES CHANNEL 93 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0041, expected range: -0.0409 -0.0224
NOAA20 CRIS RADIANCES (24 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.1968, expected range: 0.1700 0.1836
airs
AQUA AIRS RADIANCES CHANNEL 110 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0757, expected range: -0.0420 -0.0232
AQUA AIRS RADIANCES CHANNEL 21 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2528, expected range: -0.0589 0.0688
AQUA AIRS RADIANCES CHANNEL 69 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3355, expected range: -0.2287 0.0915
AQUA AIRS RADIANCES (21 channels affected) : out of range
Severe: stdev_fgdepar=0.7288, expected range: 0.8528 0.8778
atms
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.5903, expected range: -0.5250 -0.4135
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 5 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0043, expected range: 0.0036 0.0037