Almost everything t that I have ever read about “climate change ” from those of the Warminista faith concentrate on Co2 and occasionally methane as the most important elements in our chaotic and multifaceted climate when they go in to long diatribes about AGW (take a bow JM). But they are almost dismissive about the role of water vapour in the atmosphere. Yet the water vapours and the clouds they form are many times more important to keeping this planet habitable than the minuscule amounts (by proportion) of Co2 in our air. Which is why I found the report in the Daily Mail most interesting.
American researchers have discovered that the amount of water high in the atmosphere is far more influential on world temperatures than previously thought.
Although the findings do not challenge the theory of man-made global warming, they help explain why temperatures can rise and fall so dramatically from decade to decade.
The study, published in the journal Science, says a 10 per cent drop in humidity 10 miles above the Earth’s surface explains why global temperatures have been stable since the start of the century, despite the rise in carbon dioxide in the atmosphere.
And a rise in water vapour in the 1980s and 90s may also explain why temperatures shot up so quickly in the previous two decades, they say.
Water vapour has long been recognised as an important greenhouse gas. Like methane and carbon dioxide, it absorbs heat from the sun that would otherwise be reflected back into space, keeping the planet warm.
However, most computer models that predict climate concentrate on the levels of water lower down in the atmosphere.
Dr Susan Solomon, of the US National Oceanic and Atmospheric Administration, said: ‘Current climate models do a remarkable job on water vapour near the surface.
‘But this is different — it’s a thin wedge of the upper atmosphere that packs a wallop from one decade to the next in a way we didn’t expect.’
Observations from weather balloons and satellites show that ‘stratospheric water vapour’ increased in the 1980s and 1990s and dropped after 2000.
The changes took place in a narrow altitude region of the atmosphere where they would have the biggest impact on climate.
Can’t wait to hear JM or PKD explain this new study in the light of their insistence that the factor to worry about is Co2 because if this study is right it reduces the role of anthropogenic Carbon dioxide to that of a bit player, and one who has no significant dialogue…
Maybe they need a new script……