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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-10-23 00:00

iasi
METOP-B IASI RADIANCES CHANNEL 3160 : out of range
Considerable: avg_biascorr=0.4480, expected range: 0.2953 0.3942
METOP-B IASI RADIANCES CHANNEL 325 : out of range
Slight: avg_fgdepar=-0.0010, expected range: 0.0081 0.0442
cris
NOAA20 CRIS RADIANCES CHANNEL 118 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=4737.0000, expected range: 4013.6798 4582.3202
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=4671.0000, expected range: 3966.5262 4519.0738
NOAA20 CRIS RADIANCES CHANNEL 108 : out of range
Considerable: obs_number=2624.0000, expected range: 2224.0763 2523.5237
NOAA20 CRIS RADIANCES CHANNEL 109 : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=2601.0000, expected range: 2238.2770 2425.7230
NOAA20 CRIS RADIANCES CHANNEL 963 : out of range
Considerable: obs_number=2396.0000, expected range: 2034.9031 2294.6969
NOAA20 CRIS RADIANCES CHANNEL 965 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=2296.0000, expected range: 1948.7680 2150.0320
NOAA20 CRIS RADIANCES CHANNEL 989 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=2347.0000, expected range: 2014.6400 2194.5600
NOAA20 CRIS RADIANCES CHANNEL 991 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=2375.0000, expected range: 2039.0670 2232.9330
NOAA20 CRIS RADIANCES CHANNEL 123 : out of range
3 times in the last 10 days for at least one item
Slight: obs_number=4536.0000, expected range: 3878.9497 4388.2503
atms
NPP ATMS RADIANCES CHANNEL 21 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1994, expected range: 0.1614 0.1757
NPP ATMS RADIANCES CHANNEL 19 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1367, expected range: 0.1034 0.1133
gpsro
METOP-B GRAS SETTING HEIGHT 38-40 KM : out of range
Slight: stdev_norm_fgdepar=0.7789, expected range: 0.3916 0.6752