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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-05-30 00:00

amsua
METOP-B AMSUA RADIANCES (10 channels affected) : out of range
Considerable: obs_number=4223.0000, expected range: 9138.5310 17790.0940
iasi
METOP-B IASI RADIANCES (51 channels affected) : out of range
Considerable: obs_number=2364.0000, expected range: 1955.1558 2260.4692
METOP-C IASI RADIANCES CHANNEL 3093 : out of range
Considerable: avg_biascorr=0.4940, expected range: 0.2476 0.4058
cris
NPP CRIS RADIANCES CHANNEL 39 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2642, expected range: 0.2989 0.3305
NPP CRIS RADIANCES CHANNEL 54 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2284, expected range: 0.2742 0.2997
NPP CRIS RADIANCES CHANNEL 60 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1886, expected range: 0.2239 0.2577
NOAA20 CRIS RADIANCES CHANNEL 45 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1513, expected range: 0.1978 0.2325
NOAA20 CRIS RADIANCES CHANNEL 48 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1615, expected range: 0.2203 0.2500
saphir
All MEGHA-TROPIQUES SAPHIR ALLSKY ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 911.81 21543.45
ssmis
DMSP-18 SSMIS RADIANCES CHANNEL 9 : out of range
Considerable: obs_number=15522.0000, expected range: 16571.9161 19320.0839
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
Considerable: obs_number=19356.0000, expected range: 20539.9445 24462.8055
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
Considerable: obs_number=19358.0000, expected range: 20469.9139 24512.7111
gpsro
All FY-3C GNOS RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 467.59 2312.99
All COSMIC2-E5 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 648.69 3368.81
All COSMIC2-E6 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 1080.45 2485.92
COSMIC2-E3 GPSRO SETTING (24 impact heights affected) : out of range
Considerable: obs_number=279.0000, expected range: 1120.9219 3060.6996
Atmospheric Motion Vector
NPP 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=665.0000, expected range: 0.0000 500.9251
HIMAWARI-8 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HPA : out of range
Considerable: obs_number=679.0000, expected range: 120.2422 557.6303
NOAA20 VIIRS-AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=681.0000, expected range: 0.0000 475.1834
Radiosondes
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 600-900 (HPA) : out of range
1 times in the last 10 days for at least one item
Severe: rms_fgdepar=1.0019, expected range: 0.0003 0.5570
Considerable: rms_fgdepar=1.0019, expected range: 0.0000 0.5820
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : missing
1 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 56.9535 70.0465
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 48 : all data missing
Severe: obs_number=0, expected range: 139.78 176.72
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA : out of range
Considerable: obs_number=598.0000, expected range: 641.5511 711.4489
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (2 pressure layers affected : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=87.0000, expected range: 162.6888 186.2001
HIGH RESO LAND TEMP Q (G/KG) (4 pressure layers affected) : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=65.0000, expected range: 106.9515 140.1596
Considerable: obs_number=132.0000, expected range: 191.3356 205.4144
prof
EUROPEAN WIND PROFILER VECTOR DIFF (M/S) (2 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=694.0000, expected range: 1006.4479 1266.6950
Considerable: obs_number=694.0000, expected range: 1006.4479 1266.6950
synop
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
Severe: rms_fgdepar=162.5459, expected range: 46.4238 82.6655
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=76.0000, expected range: 82.4963 92.2815