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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-02-27 00:00

amsua
NOAA-19 AMSUA RADIANCES CHANNEL 6 : out of range
Severe: stdev_fgdepar=0.1877, expected range: 0.1357 0.1554
NOAA-15 AMSUA RADIANCES CHANNEL 7 : out of range
Considerable: obs_number=2122.0000, expected range: 255.8480 1705.0270
NOAA-19 AMSUA RADIANCES CHANNEL 9 : out of range
Considerable: stdev_fgdepar=0.1932, expected range: 0.1595 0.1812
iasi
METOP-B IASI RADIANCES (60 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=2362.0000, expected range: 1920.2525 2261.3725
cris
NPP CRIS RADIANCES (51 channels affected) : out of range
Severe: obs_number=17813.0000, expected range: 22016.7729 22610.1021
NOAA20 CRIS RADIANCES (54 channels affected) : out of range
Considerable: obs_number=5707.0000, expected range: 6214.4471 7210.5529
atms
NPP ATMS RADIANCES (15 channels affected) : out of range
Considerable: obs_number=18933.0000, expected range: 20854.1714 24551.9536
NOAA20 ATMS RADIANCES (7 channels affected) : out of range
Considerable: obs_number=9462.0000, expected range: 10421.6902 11922.1921
gpsro
COSMIC2-E1 GPSRO SETTING HEIGHT 42-44 KM : out of range
Considerable: stdev_norm_fgdepar=0.8421, expected range: 0.3930 0.6726
Atmospheric Motion Vector
METEOSAT-11 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=1729.0000, expected range: 2094.2934 2732.7066
NOAA20 VIIRS-AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA : out of range
Considerable: obs_number=1268.0000, expected range: 1912.8435 3075.1565
amdar
AMDAR TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: rms_fgdepar=3.9086, expected range: 0.2930 2.6629