1. The stratospheric circulation Alan Plumb M. I. T.

2. Global Meridional Circulation

3. UARS (HALOE) observations

6. 50hPa analysis 28 Jan 1992

7. 10-day integrated tracer field

8. vortex entrained tropical air midlatitude “surf zone”

9. 12-day contour advection at 480K (Waugh & Plumb, JAS, 1994.) 50hPa analysis

10. Gyroscopic stability and “wave pumping” of the circulation

12. Global Meridional Circulation

13. polar descent

14. Global Meridional Circulation

15. Arena Arctica, Kiruna, Mar 2000

16. NASA ER2 at Kiruna, Mar 2000

17. NASA DC8 in Arena Arctica, Jan 2000

18. OMS balloon launch, Esrange, Mar 2000

19. Polar Descent (Plumb et al., JGR, 2002.)

20. The “gravity wave pump”

21. polar descent