A. J. Haklander, P. C. Siegmund, H. M. Kelder

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$(PHH98 2d-Slide#15 $8 of 8$) - Atmospheric Dynamics Group$

Intro • Why is the NH midwinter wave driving relevant • How is it quantified • Which factors determine the observed interannual variability “Fundamental causes for interannual variability poorly understood” (2006 WMO/UNEP Ozone assessment, SPARC Newsletter 29, July 2007)
Why is the NH midwinter wave driving relevant • Planetary waves mainly drive Brewer-Dobson circulation (BDC) • BDC draws ozone-rich air poleward from the Tropics • Ozone is long lived in polar night, so little loss there • Meanwhile, new ozone production in the Tropics by the adjustment towards photochemical equilibrium • Therefore, BDC causes net ozone production in NH winter (Fusco&Salby,1999) • Adiabatic compression of air in downward branch at the pole yields higher early-spring temperatures → less PSC’s
Page 1: Interannual variability of the stra
Page 5 and 6: Why is the NH midwinter wave drivin
Page 7 and 8: How is the wave driving quantified
Page 9 and 10: How is the wave driving quantified
Page 11 and 12: Which factors determine the observe
Page 13 and 14: Which factors determine the observe
Page 15: Which factors determine the observe
Page 18 and 19: Conclusions → Most of the interan
Page 20: Questions

A. J. Haklander, P. C. Siegmund, H. M. Kelder

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