HadCRUT4…not what it pretends to be!

Ungracious loser James Annan couldn’t wait posting about the new all-singing all-dancing HadCRUT4 dataset, showingthat reports of the death of global warming have been somewhat exaggerated“.

It’s really really hard to avoid laughing when adjustments come out of thin air but anyway…let’s consider HadCRUT4 less of a joke for a moment.

Since temperatures go up by including the upper Arctic, it is obvious that the rest of the world, and especially the inhabited regions, have not warmed as expected.

And a 5C increase in an area where the average is -20C is _not_ the same thing as a 5C increase where the average is +10C. The former is inconsequential, the latter a change in all seasons.

So HadCRUT4 simply confirms things are going as predicted only in faraway places where there are few measurements and nothing is really changing anyway.

If this doesn’t kill global warming, it certainly helps putting it in the right place.

At The UK Hadley Centre, They Know Something Nobody Else Knows…

…or alternatively, somebody has just used giant amounts of computing power to provide the UK Government’s Defra (Department for Environment, Food and Rural Affairs ) with antiscientific numbers on alleged future climate “forecast”, “predictions” or “projections” (pick your preferred choice…).

What’s happening? Since last Sunday, there has been a curious slow-feeding of news about an upcoming “UK Climate Impact Projections” document prepared by the Met Office’s Hadley Centre for Defra, “which is trying to plan for future changes brought about by global warming“.

Even more curious is the fact that as of today neither the Hadley Centre’s website nor DEFRA’s make any mention of such document. Full results are expected by June 18, so we will have to rely on news reports in the meanwhile.

Google News shows articles from The Daily Telegraph, Sunday Times (and again), Sky News, Daily Mail, Southern Daily Echo, with mentions of 41C in London, vineyards all around, a Mediterranean climate in Devon and a list of expected temperatures at county level.

Since there is no original document to read, those news reports must have been based mostly on each other, and hopefully at least one on some sort of “hidden” press release. And in fact, there is at least one section that appears in most articles pretty much unchanged:

Some may question how the Met Office can make predictions a lifetime into the future, when it struggles to produce forecasts for the next few months. However, climate change impacts are predicted to be so strong that, over decades, they are easier to predict than short-term changes.

There are positive and negative aspects to the text above. Whoever wrote it, they had to face the fact that the time when multidecadal climate projections would be left unchallenged, has ended some time ago. Therefore they had to imagine what climate skeptics would question, and come up with some sort of an answer. Trouble is, the answer is no good at all.

  1. They are admitting that the state of the climate in the long term is uncertain
  2. There is a misuse of the word “predictions” (see below)
  3. The author tries to convey the idea that future climate is easier to forecast, the stronger the “climate change impacts”. But this means that not even the people at the Hadley Centre are confident in the projections computed in anything but the worst possible scenario (every other scenario having weaker climate change impacts, is by definition more of a struggle to predict)

Perhaps more importantly, the trouble with long-term climate predictions is not just due to their intrinsic temporal timeframe, spanning decades. Even admitting that as a possibilty (and I have my strong doubts about it), still the problem of how to go from planet-wide analyses to a regional level has not been solved. And by regions I am talking “continents”.

How did anybody at the Hadley Centre manage to compute anything meaningful at the level of Yorkshire or East Anglia? Is there anything they have not told us, a major breakthrough in climate science that will be revealed to the masses by Thursday next?

Or have they just computed and published figures that have no basis in Science?

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Another antiscientific aspect is in the use of words. I am not talking about the journalists…those are forever going to mix up “prediction” and “projection”. What is wrong is when scientists, or in any case people that should know better, add to the confusion by mixing those words up.

Look at the “answer” text above (that we can assume having been written by somebody at the Hadley Centre or Defra, the only people with access to the original document): “impacts are PREDICTED“.

Sky’s weather presenter Lucy Verasamy says: “These PREDICTIONS“.

A Met Office spokesman says: “These FORECASTS“, “Our PREDICTIONS“.

Myles Allen, head of climate dynamics at Cambridge University, is quoted: “Cities in the Midlands and south, ARE GOING to start experiencing some increasingly uncomfortable summers.

There might be very few things I understand about climate, but one there is: whoever speaks of PREDICTIONS or FORECASTS concerning the climate many decades in the future, they have failed to understand an extremely important aspect of climatology.

January Warmth Weakens BBC Meteorologist's Logical Skills

How many times have we been told that “weather” is not “climate”, that a heatwave or a cold front or heavy winds or hurricanes or the lack thereof, can say absolutely nothing about the state of the global climate?

Lo and behold, here comes the BBC’s John Hammond in the current “Monthly Outlook” for the UK:

The predominance of south or southwesterly winds kept temperatures at or above average in many parts in the early days of 2007. This theme looks set to continue for a greater part of the next month.
This comes on the back of recently released figures for 2007, which showed that on a global level 2007 was the seventh warmest on record since 1850.

Should it really be necessary to tell a meteorologist that if local above-average temperatures are due to “south/southwesterly winds” THEN the only way to connect the temperatures to global warming would be by demonstrating a link between those winds, and that warming?

Furthermore: the Hadley Centre has not published yet the final figures for 2007. Data so far show sea-surface temperatures for 2007 to be the 9th on record, globally (the southern oceans have actually recorded in December the coolest value in 13 years).

UPDATE JAN 26: HadCRUT data now available up to December 2007