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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-05-31 00:00

amsua
AQUA AMSUA RADIANCES (7 channels affected) : out of range
Considerable: obs_number=14898.0000, expected range: 16202.1993 20563.0507
iasi
METOP-B IASI RADIANCES (145 channels affected) : out of range
Severe: obs_number=15025.0000, expected range: 21607.1821 22229.6929
cris
NPP CRIS RADIANCES CHANNEL 39 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2654, expected range: 0.2989 0.3256
NPP CRIS RADIANCES CHANNEL 54 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2311, expected range: 0.2742 0.2968
NPP CRIS RADIANCES CHANNEL 60 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1899, expected range: 0.2239 0.2509
NOAA20 CRIS RADIANCES CHANNEL 45 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1471, expected range: 0.1978 0.2244
NOAA20 CRIS RADIANCES CHANNEL 48 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1537, expected range: 0.2203 0.2362
NOAA20 CRIS RADIANCES CHANNEL 1109 : out of range
Considerable: stdev_fgdepar=0.8054, expected range: 0.2842 0.6212
NOAA20 CRIS RADIANCES CHANNEL 1189 : out of range
Considerable: stdev_fgdepar=0.6628, expected range: 0.3066 0.5337
NOAA20 CRIS RADIANCES CHANNEL 1213 : out of range
Considerable: stdev_fgdepar=1.0687, expected range: 0.3924 0.8406
airs
AQUA AIRS RADIANCES (47 channels affected) : out of range
Considerable: obs_number=15795.0000, expected range: 18077.6964 19422.9286
mwhs
FY-3B MWHS RADIANCES CHANNEL 3 : out of range
Severe: obs_number=6221.0000, expected range: 16078.2941 18978.0809
FY-3B MWHS RADIANCES CHANNEL 4 : out of range
Severe: obs_number=6226.0000, expected range: 16094.7241 19008.6509
FY-3B MWHS RADIANCES CHANNEL 5 : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=3995.0000, expected range: 10252.7444 12448.0056
atms
NPP ATMS RADIANCES (11 channels affected) : out of range
Considerable: obs_number=14037.0000, expected range: 20296.9638 24611.4112
NOAA20 ATMS RADIANCES (11 channels affected) : out of range
Considerable: obs_number=15017.0000, expected range: 20159.0531 25152.6969
gpsro
All FY-3C GNOS RISING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 467.59 2312.99
All COSMIC2-E3 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 892.68 2202.55
All COSMIC2-E5 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 648.69 2308.54
All COSMIC2-E6 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 712.14 3257.53
TERRASAR-X GPSRO SETTING (9 impact heights affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=274.0000, expected range: 462.7367 1116.0988
Atmospheric Motion Vector
NOAA20 VIIRS-AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=816.0000, expected range: 0.0000 475.1834
Radiosondes
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
Severe: obs_number=332.0000, expected range: 460.9049 468.3451
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=89.0000, expected range: 162.5371 186.5741
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 900-1200 (HPA) : out of range
Considerable: obs_number=197.0000, expected range: 231.7301 287.5199
amdar
WIGOS AMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : missing
Severe: obs_number=0.0000, expected range: 0.0000 318.2563