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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-09-18 12:00

amsua
METOP-A/AMSUA RADIANCES CHANNEL 11 : out of range
Considerable: stdev_fgdepar=0.3063, expected range: 0.2580 0.2926
iasi
All METOP-A/IASI RADIANCES ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 0.00 28049.68
METOP-B/IASI RADIANCES (386 channels affected) : out of range
Severe: obs_number=17161.0000, expected range: 21474.2765 22913.5657
METOP-C/IASI RADIANCES (240 channels affected) : out of range
Severe: obs_number=95842.0000, expected range: 117612.8069 125547.5174
METOP-B/IASI RADIANCES CHANNEL 1671 : out of range
Considerable: avg_fgdepar=-0.1016, expected range: -0.0589 0.1115
cris
All NPP/CRIS RADIANCES ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 95421.74 148502.90
mhs
ALLSKY METOP-A/MHS RADIANCES (5 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=17734.0000, expected range: 26786.9062 31180.6613
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 4 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0092, expected range: 0.0112 0.0145
DMSP-18/SSMIS RADIANCES CHANNEL 5 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0089, expected range: 0.0111 0.0146
DMSP-18/SSMIS RADIANCES CHANNEL 3 : out of range
9 times in the last 10 days for at least one item
Slight: obs_number=13892.0000, expected range: 804.0430 11941.6293
gpsro
All TERRASAR-X SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1410.78
All TANDEM-X RISING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1135.57
Radiosondes
HIGH RESO LAND TEMP Q (G/KG) (4 pressure layers affected) : out of range
Severe: obs_number=234.0000, expected range: 193.6379 203.4732
All HIGH RESO SEA TEMP TEMPERATURE (K) ALL LAYERS North pole : all data missing
Severe: obs_number=0, expected range: 72.18 456.06
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
Considerable: avg_fgdepar=2.1217, expected range: -0.9551 1.0515
pilot
All LAND PILOT WIND VECTOR DIFF (M/S) ALL LAYERS North pole : all data missing
Severe: obs_number=0, expected range: 0.00 142.07
BUFR LAND PILOT WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Severe: avg_fgdepar=6.5257, expected range: 1.8026 4.3928
Severe: rms_fgdepar=9.4787, expected range: 2.4596 4.9005
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-30.1060, expected range: -3.7341 3.8230