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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-08-07 06:00

iasi
METOP-C IASI RADIANCES CHANNEL 292 : out of range
Slight: obs_number=3751.0000, expected range: 4214.0679 5942.3439
METOP-C IASI RADIANCES CHANNEL 329 : out of range
Slight: obs_number=3900.0000, expected range: 4397.8828 6220.7054
METOP-C IASI RADIANCES CHANNEL 341 : out of range
Slight: obs_number=4432.0000, expected range: 4899.8961 6770.9274
METOP-C IASI RADIANCES CHANNEL 354 : out of range
Slight: obs_number=4149.0000, expected range: 4647.9434 6491.6448
METOP-C IASI RADIANCES CHANNEL 360 : out of range
Slight: obs_number=4067.0000, expected range: 4563.1019 6400.1334
METOP-C IASI RADIANCES CHANNEL 366 : out of range
Slight: obs_number=3927.0000, expected range: 4392.1729 6239.7683
cris
All NPP CRIS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 5991.04 9089.01
NOAA20 CRIS RADIANCES CHANNEL 989 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0363, expected range: 0.0564 0.0791
NOAA20 CRIS RADIANCES CHANNEL 993 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2205, expected range: 0.2439 0.2632
NOAA20 CRIS RADIANCES CHANNEL 1005 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0826, expected range: 0.1014 0.1137
atms
All NPP ATMS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 3795.34 8857.16
Atmospheric Motion Vector
AQUA MODIS IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: obs_number=164.0000, expected range: 0.0000 39.2549
All NPP VIIRS AMV IR ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 638.73 1624.46
METOP-C AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
Slight: obs_number=267.0000, expected range: 416.7953 631.2047
resat
AURA OMI OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-3.6783, expected range: -3.2928 -2.8770
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 60-61 (HPA) : out of range
40 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0260, expected range: -0.0354 -0.0183