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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-06-01 12:00

iasi
METOP-B IASI RADIANCES CHANNEL 217 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1132, expected range: -0.0991 -0.0904
cris
NPP CRIS RADIANCES (17 channels affected) : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1874, expected range: 0.2092 0.2111
NPP CRIS RADIANCES CHANNEL 39 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2613, expected range: 0.2989 0.3246
NPP CRIS RADIANCES CHANNEL 54 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2280, expected range: 0.2742 0.2947
NPP CRIS RADIANCES CHANNEL 60 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1882, expected range: 0.2239 0.2461
NOAA20 CRIS RADIANCES CHANNEL 68 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0971, expected range: 0.1605 0.2423
NOAA20 CRIS RADIANCES CHANNEL 45 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1203, expected range: 0.1978 0.2049
NOAA20 CRIS RADIANCES CHANNEL 60 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1089, expected range: 0.1811 0.2529
mwhs2
FY-3C MWHS2 ALLSKY RADIANCES (5 channels affected) : out of range
Severe: stdev_norm_fgdepar=0.8442, expected range: 0.7023 0.7681
mwhs
All FY-3B MWHS ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 3711.08 30092.68
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 3140.25
Radiosondes
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 26 : all data missing
Severely_persistent: obs_number=0, expected range: 79.93 139.67
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
Severe: obs_number=860.0000, expected range: 950.2418 968.7582
LAND TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=155.0000, expected range: 44.8123 99.4377
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (4 pressure layers affected : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=136.0000, expected range: 242.8791 298.6209
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=123.0000, expected range: 182.3190 253.1810
amdar
All AMDAR WIND VECTOR DIFF (M/S) ALL LAYERS North West Pacific : all data missing
Severe: obs_number=0, expected range: 0.00 424.75
WIGOS AMDAR WIND VECTOR DIFF (M/S) (2 pressure layers affected) : missing
Severe: obs_number=0.0000, expected range: 0.0000 311.0459
synop
MANUAL LAND SYNOP SURFACE PRESSURE (PA) : out of range
Severe: rms_fgdepar=159.8516, expected range: 95.5053 125.4264
Considerable: obs_number=591.0000, expected range: 487.9713 529.0287