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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-10-22 12:00

iasi
METOP-B IASI RADIANCES (39 channels affected) : out of range
Considerable: obs_number=2448.0000, expected range: 1724.0841 2252.3159
cris
NOAA20 CRIS RADIANCES CHANNEL 120 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=4551.0000, expected range: 3794.5040 4355.4960
NOAA20 CRIS RADIANCES CHANNEL 121 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=4715.0000, expected range: 3966.5262 4519.0738
NOAA20 CRIS RADIANCES CHANNEL 123 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=4622.0000, expected range: 3878.9497 4388.2503
NOAA20 CRIS RADIANCES CHANNEL 965 : out of range
Considerable: obs_number=2038.0000, expected range: 1482.0405 1917.5595
NOAA20 CRIS RADIANCES CHANNEL 991 : out of range
Considerable: obs_number=2073.0000, expected range: 1535.7400 1955.8600
NOAA20 CRIS RADIANCES CHANNEL 912 : out of range
Considerable: obs_number=1808.0000, expected range: 1214.9040 1581.8960
NOAA20 CRIS RADIANCES CHANNEL 915 : out of range
Considerable: obs_number=1994.0000, expected range: 1418.7857 1852.8143
NOAA20 CRIS RADIANCES CHANNEL 929 : out of range
Considerable: obs_number=1838.0000, expected range: 1254.2136 1623.7864
NOAA20 CRIS RADIANCES CHANNEL 949 : out of range
Considerable: obs_number=1969.0000, expected range: 1374.4332 1819.5668
NOAA20 CRIS RADIANCES CHANNEL 963 : out of range
Considerable: obs_number=2085.0000, expected range: 1548.2135 1975.3865
NOAA20 CRIS RADIANCES CHANNEL 993 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=2115.0000, expected range: 1566.9208 1994.2792
atms
NPP ATMS RADIANCES CHANNEL 21 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2197, expected range: 0.1540 0.1757
NPP ATMS RADIANCES CHANNEL 19 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1259, expected range: 0.0997 0.1133
NPP ATMS RADIANCES CHANNEL 20 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2901, expected range: 0.2447 0.2540
NOAA20 ATMS RADIANCES CHANNEL 21 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.0447, expected range: -0.1112 -0.0844
NOAA20 ATMS RADIANCES CHANNEL 22 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.5876, expected range: 0.5070 0.5461