1. WRF modelling of Flight B989 20th Oct 2016
….cont’d
[…WRF initialised with 0.5 degree NCEP GFS analyses
33 tracers added
Simulation start (and tracer release): 06Z 20th Oct.
Simulation end time: 0Z 19th Oct.
400 m resolution, 50 vertical levels. Underlying orography
is USGS 30 arc-second.
Run on ARCHER 512 processors ~ real time…]

2. WRF modelling of Flight B989 20th Oct 2016
…continued

3. FAAM Comparison with observations: assume Katla West is only source
Katla West: range rings every 2 k m

4. WRF
At each aircraft measurement point (lat / lon / altitude)
Interpolate from WRF output to get corresponding WRF concentration
i.e. 3-D interpolation (quite time-consuming)

5. Comparison with observations
WRF
Katla West: range rings every 2 k m

6. Comparison with observations
FAAM
Katla West: range rings every 2 k m

7. WRF
Slight difference in bearing.
Modelled centre of plume ~ 1.5 km from that observed.

8. WRF modelling of Flight B987 18th Oct 2016
As before…
WRF initialised with 0.5 degree NCEP GFS analyses
33 tracers added (see below)
Simulation start (and tracer release): 06Z 18th Oct.
Simulation end time: 0Z 21st Oct.
400 m resolution, 50 vertical levels. Underlying orography
is USGS 30 arc-second.

9. All sources

10. All sources

11. FAAM Comparison with observations: assume Katla West is only source
Katla West: range rings every 2 k m

12. WRF Comparison with observations: assume Katla West is only source
Katla West: range rings every 2 k m

13. FAAM Comparison with observations: assume Katla West is only source
Katla West: range rings every 2 k m

14. WRF Comparison with observations: assume Katla West is only source
Katla West: range rings every 2 k m

15. FAAM Comparison with observations: assume Katla West is only source
Where is this coming from?
FAAM
Katla West: range rings every 2 k m

16. FAAM OBS &
WRF WINDS

17. 10 m
100 m
GFS winds

18. HYSPLIT
Backwards dispersion
Init. 16Z
Current plot for 04Z

19. Results would appear to suggest there is another source
E.g. Grimsvotn??
- Is there “industry” upstream?
GRIMSVOTN (TRACER # 9)

20. Results for 08Z, 10Z, 12Z, 14Z, 16Z are online (1230 plots!)
and subdirectories.
Filenames e.g.
trac_all_0030_ _06:00:00
all volcanoes level (m AGL) date time (GMT)
i.e. summation
trac_01_0030_ _06:00:00
volcano number 01