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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-16 00:00

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 8 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=1.8863, expected range: 2.4475 3.2427
iasi
METOP-A/IASI RADIANCES CHANNEL 5399 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4250, expected range: 0.2426 0.3319
METOP-B/IASI RADIANCES (54 channels affected) : out of range
Slight: obs_number=10220.0000, expected range: 10420.8668 11811.8701
cris
NPP/CRIS RADIANCES CHANNEL 622 : out of range
26 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.2908, expected range: 0.0358 0.1599
NPP/CRIS RADIANCES CHANNEL 1157 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.8739, expected range: -0.2954 0.3049
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
46 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=3.2280, expected range: 0.0709 0.3529
NPP/CRIS RADIANCES (101 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.2288, expected range: 0.2493 0.2725
NPP/CRIS RADIANCES (170 channels affected) : out of range
Severe: obs_number=17661.0000, expected range: 7388.0659 8057.7195
Atmospheric Motion Vector
HIMAWARI-8 AMV VIS1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA : out of range
Considerable: obs_number=1170.0000, expected range: 389.8101 981.3010
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 3 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: obs_number=21801.0000, expected range: 1748.6589 7892.1832
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
4 times in the last 10 days for at least one item
Severe: obs_number=62237.0000, expected range: 8965.3525 17964.0568
Slight: stdev_fgdepar=0.6901, expected range: 0.4037 0.6490
Radiosondes
LAND TEMP Q (G/KG) PRESSURE LAYER 300-600 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=153.0000, expected range: 16.6667 121.8333
synop
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
14 times in the last 10 days for at least one item
Severely_persistent: obs_number=64.0000, expected range: 65.0000 65.0000
Severely_persistent: obs_number=86.0000, expected range: 50.2007 65.5640
BUFR LAND SYNOP RH2M (%) : out of range
4 times in the last 10 days for at least one item
Severe: obs_number=60.0000, expected range: 61.0000 61.0000
ship
AUTOMATIC SHIP SURFACE PRESSURE (PA) : out of range
12 times in the last 10 days for at least one item
Slight: obs_number=2006.0000, expected range: 1740.3118 1942.2969
buoy
MOORED BUOYS SURFACE PRESSURE (PA) : out of range
9 times in the last 10 days for at least one item
Severely_persistent: obs_number=35.0000, expected range: 50.7484 70.1530
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=120.0000, expected range: 0.0000 0.0000
Severely_persistent: avg_biascorr=6.0504, expected range: 0.0000 0.0000