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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-06-30 18:00

iasi
METOP-B IASI RADIANCES CHANNEL 163 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2426, expected range: 0.2605 0.2811
METOP-B IASI RADIANCES CHANNEL 170 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1833, expected range: 0.2070 0.2357
METOP-C IASI RADIANCES CHANNEL 303 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2066, expected range: 0.1812 0.1928
METOP-C IASI RADIANCES CHANNEL 183 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1537, expected range: 0.1861 0.2177
gpsro
COSMIC2-E1 GPSRO SETTING HEIGHT 2-4 KM : out of range
Slight: obs_number=549.0000, expected range: 743.1179 1484.6599
COSMIC2-E1 GPSRO SETTING HEIGHT 8-10 KM : out of range
Slight: obs_number=826.0000, expected range: 1062.6141 1988.5526
COSMIC2-E1 GPSRO SETTING HEIGHT 20-22 KM : out of range
Slight: obs_number=552.0000, expected range: 720.9193 1347.5252
COSMIC2-E1 GPSRO SETTING HEIGHT 46-48 KM : out of range
Slight: obs_number=438.0000, expected range: 564.6010 1068.6767
SENTINEL-6A GPSRO SETTING (6 impact heights affected) : out of range
Slight: obs_number=1614.0000, expected range: 1955.4698 3209.0302
Atmospheric Motion Vector
AQUA MODIS CLOUDY WV WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HP : out of range
Slight: obs_number=230.0000, expected range: 13.0219 142.4377
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 123618.15
resat
AURA OMI OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-3.8327, expected range: -3.2928 -2.8430
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 25430-25431 (HPA) : out of range
37 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=3.4052, expected range: 2.4598 2.9365
NOAA-19 SBUV OZONE, TOP (21 pressure layers affected) : out of range
36 times in the last 10 days for at least one item
Severely_persistent: obs_number=108.0000, expected range: 51.0758 68.2921
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1010-1011 (HPA) : out of range
37 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.6685, expected range: 1.3848 1.9796
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 10-11 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0397, expected range: -0.0475 -0.0433
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 100-101 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.2457, expected range: 0.1408 0.1512
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 640-641 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-3.5244, expected range: -2.4521 -2.3741
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 40-41 (HPA) : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0136, expected range: -0.0002 0.0137