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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-05-28 00:00

iasi
METOP-C IASI RADIANCES CHANNEL 258 : out of range
Considerable: avg_biascorr=-0.3770, expected range: -0.3407 -0.2791
cris
NPP CRIS RADIANCES CHANNEL 60 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1882, expected range: 0.2239 0.2686
NPP CRIS RADIANCES CHANNEL 54 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2317, expected range: 0.2742 0.3107
NPP CRIS RADIANCES CHANNEL 51 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2194, expected range: 0.2957 0.2973
NPP CRIS RADIANCES CHANNEL 48 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2218, expected range: 0.2969 0.3020
NPP CRIS RADIANCES CHANNEL 42 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2342, expected range: 0.3087 0.3174
NPP CRIS RADIANCES CHANNEL 36 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1983, expected range: 0.2699 0.2737
NOAA20 CRIS RADIANCES CHANNEL 66 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1463, expected range: 0.1635 0.1645
gpsro
All FY-3C GNOS RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 467.59 2312.99
TERRASAR-X GPSRO SETTING (7 impact heights affected) : out of range
Considerable: obs_number=332.0000, expected range: 510.8632 1127.9210
COSMIC2-E5 GPSRO SETTING (24 impact heights affected) : out of range
Considerable: obs_number=265.0000, expected range: 1291.5319 2794.5931
COSMIC2-E6 GPSRO SETTING (14 impact heights affected) : out of range
Considerable: obs_number=1064.0000, expected range: 1367.1256 2300.3744
Atmospheric Motion Vector
HIMAWARI-8 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-60 : out of range
Considerable: obs_number=2705.0000, expected range: 1535.9054 2460.5946
METOP-C AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: obs_number=566.0000, expected range: 267.6539 491.8429
GOES-17 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=4064.0000, expected range: 1044.1988 2980.8012
NPP VIIRS AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Slight: stdev_press=73.5397, expected range: 65.0631 70.0627
Radiosondes
LAND TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : missing
Severe: obs_number=0.0000, expected range: 0.0000 383.7707
HIGH RESO SEA TEMP WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HPA : out of range
Considerable: rms_fgdepar=9.4424, expected range: 0.0000 5.9395
prof
All EUROPEAN WIND PROFILER ALL LAYERS South West Pacific : all data missing
Severe: obs_number=0, expected range: 269.66 748.84
All EUROPEAN WIND PROFILER ALL LAYERS West pacific Tropica : all data missing
Severe: obs_number=0, expected range: 269.66 748.84
EUROPEAN WIND PROFILER VECTOR DIFF (M/S) (2 pressure layers affected) : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=1080.0000, expected range: 1922.7945 2518.2055
synop
MANUAL LAND SYNOP SURFACE PRESSURE (PA) : out of range
Considerable: obs_number=119.0000, expected range: 129.8638 149.1362