Dit is wat ik ervan begrepen heb:
De AAM is de rotatie van de atmosfeer ten opzichte van de aarde. De atmosfeer draait sneller of langzamer dan de aarde. Sneller geeft positieve AAM, langzamer negatieve.
Uit de link van Sebastiaan:
A positive AAM tendency with its tropical convection forcing creates waves or ripples that generate frictional torque (stretching of the atmosphere with any movement one way having to be corrected the other way to cancel out what would otherwise be a vacuum which is unsustainable). These waves then ripple out and start to generate ridges and troughs in the atmosphere. These are most prominent initially in the Pacific. Then this ridging has knock on effects downstream setting up further ridges and troughs. As this movement impacts on mountainous areas like the Rockies it creates further stretching known as “mountain torque”. It is this that can strongly impact on the jet stream, causing it to take on different trajectories and to buckle and meander. With higher AAM, this often eventually favours ridging in the central Atlantic and this can also favour greater.
Kort gezegd: hoge AAM, meer kans op blokkadevorming.
Hier dagelijkse data van AAM, alleen de plaatjes laden niet op mijn laptop.
http://www.atmos.albany.edu/student/nschiral/gwo.html
Een recente tweet:
https://twitter.com/antmasiello/status/1063495969524850690
