Some preliminary FIM results

1. Some preliminary FIM results DCMIP workshop July/August 2012 Boulder, CO

2. DCMIP Test 1-1(3-D deformational flow) Tracer advection in a 3-D time-dependent velocity field designed to return tracer to original position after 12 days. Model dynamics disabled (active routines: cnuity, trcadv, hybgen). FIM running in pure sigma coordinate mode 60 layers; horiz mesh size ~120 km

3. Tracer and flow field at day 0

4. Vertical section along equator, showing tracer at day 0 Eastern hemisphere Western hemisphere

5. Tracer and flow field at day 6

6. Vertical section along equator, showing tracer at day 6 Eastern hemisphere Western hemisphere

7. Tracer and flow field at day 12

8. Vertical section along equator, showing tracer at day 12 Eastern hemisphere Western hemisphere

9. DCMIP Test 1-2(Hadley-like meridional circulation) Tracer advection in vertical-meridional circulation cells. Model dynamics disabled (active routines: cnuity, trcadv, hybgen). Time-and height-dependent 3-D flow designed to return tracer to original position after 24 hrs. FIM running in pure sigma coordinate mode 30 layers; horizmesh size ~ 240 km

10. Lower- and upper-level winds (left/right) at 0 hrs. Vertical resolution: 15 layers

11. Lower- and upper-level winds (left/right) at 24 hrs.

12. Vertical-meridional section through tracer field at 0, 6, 12,18,24 hrs

13. DCMIP Test 1-3(advection over heavily corrugated mountain) Tracer advection in terrain-following coordinates. Model dynamics disabled (active routines: cnuity, trcadv, hybgen). Time-independent horizontal flow. Schaer-type, 2km high, corrugated mountain. 3 passive tracers representing low, middle, high clouds. Advection once around the globe (12 days) 30 layers; horizmesh size ~120km

14. DCMIP Test 1-3 (cont.) Since the prescribed 2-D, nondivergent flow is inconsistent with the presence of an obstacle, the mountain is removed (“replaced by thin air”) after the terrain-following surfaces have been defined. Their raggedness is maintained over time with the help of the original mountaintop surface pressure.

16. Initial tracer position zonal section along equator, day 0

17. Western hemisphere Eastern hemisphere zonal section along equator, day 0

18. zonal section along equator, day 6 Eastern hemisphere Western hemisphere

19. zonal section along equator, day 12 Eastern hemisphere Western hemisphere

20. “low-level” cloud, day 12

21. “upper-level” cloud, day 12

22. DCMIP Test 2-0-0(atmosphere initially at rest over heavily corrugated mountain) Spurious accelerations due to pressure gradient errors in initially motionless atmosphere over ragged mountain complex. FIM configured with terrain-following coordinates. Model dynamics enabled, but no rotation (f=0). 30 layers; horiz mesh size ~120km

23. Vertical section across mountain complex, day 2 (cm/s)

24. Vertical section across mountain complex, day 4 (cm/s)

25. Vertical section across mountain complex, day 6 (cm/s)

26. DCMIP Test 4-1(dry baroclinic instability) Mid-latitude cyclogenesisin baroclinically unstable zonal flow, triggered by small initial perturbation. 30 layers; horiz mesh size ~120km

27. Initial conditions at 500 hPa

28. Vertical-meridional section showing initial conditions

29. Surface conditions, day 10

30. 500 hPa flow, day 10