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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-05-29 12:00

amsua
METOP-B AMSUA RADIANCES CHANNEL 9 : out of range
Considerable: avg_biascorr=-0.0798, expected range: -0.0598 -0.0271
cris
NPP CRIS RADIANCES CHANNEL 36 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2074, expected range: 0.2699 0.2780
NPP CRIS RADIANCES CHANNEL 42 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2450, expected range: 0.3087 0.3234
NPP CRIS RADIANCES CHANNEL 48 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2311, expected range: 0.2969 0.3058
NPP CRIS RADIANCES CHANNEL 51 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2293, expected range: 0.2957 0.3000
NPP CRIS RADIANCES CHANNEL 54 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2373, expected range: 0.2742 0.3131
NOAA20 CRIS RADIANCES CHANNEL 45 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1307, expected range: 0.1978 0.2521
NOAA20 CRIS RADIANCES CHANNEL 48 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1372, expected range: 0.2203 0.2728
mwhs2
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 14 : out of range
Severe: avg_norm_fgdepar=-0.2703, expected range: -0.0942 0.0808
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 6 : out of range
1 times in the last 10 days for at least one item
Considerable: stdev_norm_fgdepar=0.8201, expected range: 0.6960 0.7681
FY-3C MWHS2 ALLSKY RADIANCES CHANNEL 13 : out of range
Considerable: avg_norm_fgdepar=-0.2247, expected range: -0.1057 0.0904
atms
NOAA20 ATMS RADIANCES (7 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=3808.0000, expected range: 3160.9668 3669.7391
gpsro
All FY-3C GNOS RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 467.59 2312.99
All COSMIC2-E6 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 1060.82 2523.07
SPIRE LEMUR 3U GPSRO SETTING HEIGHT 24 : out of range
Slight: stdev_norm_fgdepar=0.9751, expected range: 0.8255 0.9428
Atmospheric Motion Vector
NPP VIIRS AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=680.0000, expected range: 0.0000 517.8232
HIMAWARI-8 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=2562.0000, expected range: 3202.2372 5665.5128
NOAA20 VIIRS-AMV IR 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
Considerable: obs_number=733.0000, expected range: 0.0000 514.1707
METOP-B AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Slight: avg_fgdepar=4.6570, expected range: 3.5614 4.4285
Radiosondes
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 84 : all data missing
Severely_persistent: obs_number=0, expected range: 16.61 210.59
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 600-900 (HPA) : out of range
1 times in the last 10 days for at least one item
Severe: rms_fgdepar=4.6291, expected range: 0.0000 1.8631
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : missing
Severe: obs_number=0.0000, expected range: 63.0180 68.1820
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 26 : all data missing
Severe: obs_number=0, expected range: 84.25 133.75
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 83 : all data missing
Severe: obs_number=0, expected range: 33.28 362.03
buoy
MOORED BUOYS WIND VECTOR DIFF (M/S) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=66.0000, expected range: 71.9495 80.9978