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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Early delivery 4D-VAR at 2019-09-12 12:00

cris
NPP/CRIS RADIANCES CHANNEL 1165 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=6.0747, expected range: 3.0623 4.9371
NPP/CRIS RADIANCES (114 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=8457.0000, expected range: 48490.6086 66823.4995
atms
NOAA20/ATMS RADIANCES (7 channels affected) : out of range
Slight: obs_number=16944.0000, expected range: 18335.8685 19064.5161
Atmospheric Motion Vector
METEOSAT-8/AMV VIS2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA : out of range
Slight: obs_number=816.0000, expected range: 1089.3251 2618.6749
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: obs_number=9502.0000, expected range: 33044.5579 48246.6987
Radiosondes
All DROP SONDE TEMPERATURE (K) ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 382.45
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 600-900 (HPA) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: obs_number=9.0000, expected range: 80.5057 120.6708
All HIGH RESO SEA TEMP TEMPERATURE (K) ALL LAYERS North West Pacific : all data missing
Severely_persistent: obs_number=0, expected range: 88.49 144.42
LAND TEMP TEMPERATURE (K) PRESSURE LAYER 900-1200 (HPA) : out of range
Severe: obs_number=108.0000, expected range: 31.6502 68.8204
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : out of range
2 times in the last 10 days for at least one item
Severe: rms_fgdepar=0.7316, expected range: 0.1854 0.4943
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (3 pressure layers affected : out of range
Severe: obs_number=262.0000, expected range: 167.8752 186.7498
HIGH RESO LAND TEMP TEMPERATURE (K) (4 pressure layers affected) : out of range
Considerable: avg_biascorr=0.5468, expected range: -0.2042 0.2250
HIGH RESO SEA TEMP TEMPERATURE (K) PRESSURE LAYER 900-1200 (HPA) : out of range
Slight: rms_fgdepar=1.9379, expected range: 0.0000 1.3318
amdar
WIGOS AMDAR TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: rms_fgdepar=0.7253, expected range: 0.2341 0.5365
synop
BUFR LAND SYNOP RH2M (%) : out of range
9 times in the last 10 days for at least one item
Severely_persistent: obs_number=173.0000, expected range: 264.8660 314.9118
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
3 times in the last 10 days for at least one item
Severely_persistent: obs_number=79.0000, expected range: 96.9683 120.5611
Severely_persistent: obs_number=204.0000, expected range: 312.4646 369.0909
Severe: rms_fgdepar=113.6133, expected range: 25.8274 69.9670
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.5924, expected range: 0.0000 0.0000