1 / 12

Insights into the North Atlantic Oscillation Dynamics

Unveiling the workings of the NAO, its impact on hemispheric modes, and the driving force behind the mid-latitude jet through stirring and momentum fluxes. Examine the symmetric and asymmetric models and the influence of baroclinic eddies on weather patterns. Discover the interconnected nature of the NAO and AO.

nquintero
Download Presentation

Insights into the North Atlantic Oscillation Dynamics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. What is the NAO? Geoffrey Vallis1 and Adam Scaife2 April 2004 C20C workshop, ICTP. 1 - GFDL, Princeton, USA. 2 - Hadley Centre, Met Office, Exeter, UK.

  2. Observed NAO +

  3. Observed NAO -

  4. NAO timescales

  5. Hemispheric Modes

  6. NAO+ => Double jet structure

  7. Models

  8. Symmetric EOFs from asymmetric events. +ve events 1st EOF from symmetric GCM -ve events

  9. The mid-latitude jet is an eddy driven jet

  10. Stirring and Momentum fluxes

  11. 1st EOF – statistically symmetric barotropic model. 1st EOF – asymmetric models. Barotropic model G.C.M.

  12. Conclusions • The NAO (and AO) is produced by the forcing from weather. • Dipole patterns are a natural consequence of meridionally localised stirring by baroclinic eddies. • Stirring produces eddy momentum fluxes which drive the midlatitude westerly jet. • Zonally localised forcing/stirring produces zonally localised response (the NAO). • The same mechanism drives the NAO and AO.

More Related