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Preliminary Results from DCMIP Workshop 2012 Boulder: Tracer Advection & Model Dynamics

Explore atmospheric modeling experiments from the DCMIP workshop focusing on tracer advection and model dynamics with detailed results over multiple days. Investigate deformational flow, meridional circulation, and advection over mountains.

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Preliminary Results from DCMIP Workshop 2012 Boulder: Tracer Advection & Model Dynamics

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  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.

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

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

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

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

  19. “low-level” cloud, day 12

  20. “upper-level” cloud, day 12

  21. 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

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

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

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

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