Lloyd Parker wrote:
Uh, okay. But this is irrelevant to Tom's point still stands: "If cold
winds are blowing from the Antarctic then warm winds must be blowing
into it to compensate." It's a simple point. Why not address it
directly?

So when a cold front from Canada sweeps down into the US, Canada is getting
warmed? What nonsense.

Hmmmm.


You, like so much of traditional schematic weather thought,
are focusing on the front of the air mass.

That is natural since the most intense convergence and
hence active weather events (wind, precipitation,
rapid temperature change ) are found on the front edge.

On the trailing edge of the air mass
(LeRoux's Mobile Polar High) there is a poleward flow
of more equatorial air with greater temperature and
humidity.

LeRoux's contention is that this 'return flow'
can lead to paradoxical situations.

For example, if cold air mass formation slows, less
meridional transfer takes place. Because the slower forming
polar air mass sits at the poles longer before gaining critical mass,
colder polar temperatures may result from a overall warmer world.

To the point of AGW, a colder globe might reasonably be expected
to produce more polar highs. But a greater number or intensity
of polar highs would lead to greater exchange with the tropics.
Consequently tropical humidity might spread more and make a
colder world more humid (on average) and a warmer world more dry.

In reality there are size, shape, intensity, depth, frequency of
formation, orientation and important to LeRoux's thesis, preferred
pathway of mobile polar highs to consider.

There is fault to be found with some of his work, but I find it
interesting how much the forecast models (GFS) actually bear out
his descriptions.