Atmospheric blocking is complex and not fully understood. It is , however clear that it is due to the interaction of tropospheric waves with the stratosphere.
All blocking or just that helped by SSW's and stratosphere changes?
In this the vertical disctribution of temperature plays a key role. A very cold polar stratosphere which is encouraged by ozone depletion and CO2 increase favours a strong high latitude jet. Solay UV, CFCs polar stratospheric clouds, all play a role in regulating stratospheric ozone
I've a lot to learn, as ever, but I thought the tropopause 'puts a lid on weather' as temperatures rise from there up? So, how does stratosphere 'weather' (and we mean 'weather', not energy because the stratosphere is very rarified and contains a tiny fraction of the air the troposphere does?) higher up feed down through the tropopause, given how little of substance there is to the stratophere, and have such a apparently major effect?
"When it takes nearly 900,000 votes to elect one party’s MP, and just 26,000 for another, you know something is deeply wrong."
The electoral reform society, 14,12,19