In uk.sci.weather on Thu, 13 Dec 2007, Dick Lovett
wrote :
On Dec 13, 8:590 I can understand why low pressure cells are deeper in winter - greater
temperature contrast, but what mechanism causes winter high pressure
cells to have higher central values than summer ones?
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)

Its partly a case of what goes up must come down. The large amount of
rising air needed for a deep low descends somewhere to form an intense
high. Also the intense radiational cooling over the continents in
winter adds to the effect through the extra density of the cold
boundary layer air.

OK, that makes sense.
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)