Prof Anastasios Tsonis, head of the University of Wisconsin Atmospheric Sciences Group , has recently shown that these MDOs move together in a synchronized way across the globe, abruptly flipping the world's climate from a 'warm mode' to a 'cold mode' and back again in 20 to 30-year cycles.
'They amount to massive rearrangements in the dominant patterns of the weather,' he
said yesterday, 'and their shifts explain all the major changes in world temperatures during the 20th and 21st Centuries.
'We have such a change now and can therefore expect 20 or 30 years of cooler temperatures.'
said that the period from 1915 to 1940 saw a strong warm mode, reflected in rising temperatures.
In contrast, Prof Tsonis
said, last week 56 per cent of the surface of the United States was covered by snow.
" That hasn't happened for several decades," he
said, "Perhaps we will see talk of an ice age again by the early 2030s, just as the MDOs shift once more and temperatures begin to rise."
Like Prof Latif, Prof Tsonis
is not a climate change 'denier'.
There is, he
said, a measure of additional 'background' warming due to human activity and greenhouse gases that runs across the MDO cycles.
Prof. Tsonis said that when he published his work in the highly respected journal Geophysical Research Letters, he was deluged with 'hate emails'.
added, "People were accusing me of wanting to destroy the climate, yet all I'm interested in is the truth."
also received hate mail from climate change skeptics, accusing him of not going far enough to attack the theory of man-made warming.
The work of Profs Latif, Tsonis
and their teams raises a crucial question: If some of the late 20th Century warming was caused not by carbon dioxide but by MDOs, then how much?
did not give a figure; Latif suggested it could be anything between ten and 50 per cent. Other critics of the warming orthodoxy say the role played by MDOs is even greater.