From Maggie’s Farm.

What follows is a general theory of natural climate variation supported by observation of the changing temperature of the atmosphere and the sea between 1948 and September 2009. This work suggests that strong warming after 1978 is an entirely natural phenomenon.

“Mad dogs and Englishmen go out in the midday sun. The sun is much too sultry and one must avoid its ultry violet rays”. Noel Coward 1932.

Perhaps Noel Coward’s observation is particularly pertinent in the southern hemisphere where there is less ozone to absorb UVB. During the warming mode, protective ice crystals evaporate, allowing the surface to warm. Most of the warming activity post 1978 has been in the southern hemisphere in late winter and spring. This warming activity is plainly driven by shifts in atmospheric pressure affecting vortex activity. There are two climate modes:

The Warming Mode:

There is a shift of the atmosphere from the poles towards mid and low latitudes under electromagnetic forcing of ionized air.

Weakening of the polar vortexes curtails the flow of ionized nitrogen into the upper stratosphere allowing the survival of oxygen ions and increased ozone formation.

Intermixing of ozone into the upper troposphere raises temperature in the ice cloud zone. Ice crystals evaporate.
More solar radiation reaches the surface which warms.

In the southern hemisphere 200hpa temperature rises much more than in the northern hemisphere exhibiting strong equinoctial maxima.
Peak anomalies in stratospheric temperature occur in September-October rather than March.

A southern spring deficit in ice cloud density promotes warming across all southern latitudes which promotes the El Nino pattern of sea surface temperature at the equator.

Read on.