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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-11-05 12:00

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 10 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1333, expected range: 0.2179 0.3812
NOAA-18/AMSUA RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Severe: stdev_fgdepar=0.5783, expected range: 0.4272 0.5259
iasi
METOP-B/IASI RADIANCES CHANNEL 95 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5842, expected range: 0.1863 0.4388
METOP-B/IASI RADIANCES CHANNEL 97 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4024, expected range: 0.2231 0.3267
METOP-B/IASI RADIANCES CHANNEL 5988 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4960, expected range: 0.1936 0.3856
METOP-B/IASI RADIANCES CHANNEL 5992 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4955, expected range: 0.1886 0.3781
METOP-B/IASI RADIANCES CHANNEL 5994 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.5394, expected range: 0.1918 0.3970
METOP-B/IASI RADIANCES CHANNEL 83 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0608, expected range: 0.1017 0.3282
airs
AQUA/AIRS RADIANCES CHANNEL 77 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7965, expected range: 0.3612 0.6326
AQUA/AIRS RADIANCES CHANNEL 78 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.6915, expected range: 0.3790 0.5856
AQUA/AIRS RADIANCES (12 channels affected) : out of range
Severe: avg_biascorr=-0.1294, expected range: 0.0233 0.1994
AQUA/AIRS RADIANCES CHANNEL 375 : missing
1 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 2585.9037 6760.2140
atms
NOAA20/ATMS RADIANCES CHANNEL 7 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2076, expected range: -0.1970 -0.1759
gpsro
METOP-B/GRAS SETTING HEIGHT 20 : out of range
Slight: avg_norm_fgdepar=0.3119, expected range: 0.0077 0.2768
Atmospheric Motion Vector
HIMAWARI-8 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
2 times in the last 10 days for at least one item
Slight: avg_fgdepar=4.0956, expected range: 3.0979 3.9867
Slight: stdev_fgdepar=2.4755, expected range: 1.7681 2.3578
Radiosondes
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0289, expected range: -0.0063 0.0059
Severely_persistent: rms_fgdepar=0.0403, expected range: 0.0000 0.0091
HIGH RESO LAND TEMP Q (G/KG) (2 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_fgdepar=-0.0198, expected range: -0.0079 0.0043
HIGH RESO LAND TEMP Q (G/KG) (4 pressure layers affected) : out of range
Severe: obs_number=66.0000, expected range: 191.5707 204.5469
HIGH RESO SEA TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Severe: rms_fgdepar=0.0203, expected range: 0.0000 0.0100
Slight: avg_fgdepar=-0.0054, expected range: -0.0046 0.0024
HIGH RESO SEA TEMP Q (G/KG) (4 pressure layers affected) : out of range
Severe: obs_number=67.0000, expected range: 127.1182 138.4608
HIGH RESO SEA TEMP TEMPERATURE (K) (4 pressure layers affected) : out of range
Severe: obs_number=141.0000, expected range: 241.2587 345.4079
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
Considerable: rms_fgdepar=0.0376, expected range: 0.0000 0.0230
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: avg_fgdepar=0.9282, expected range: -0.0683 0.5503
metar
AUTOMATIC METAR SURFACE PRESSURE (PA) : out of range
Severe: rms_fgdepar=138.0002, expected range: 18.7061 74.1813