Tag: Open Mind

Is earth’s temperature about to soar? (No pause, no hiatus, only warming)

This is a guest post by the statistician who blogs as Tamino, cross-posted from his Open Mind blog with his permission. It’s important reading…

A recent blog post on RealClimate by Stefan Rahmstorf shows that when it comes to recent claims of a “pause” or “hiatus,” or even a slowdown in global surface temperature, there just isn’t any reliable evidence to back up those claims.

TempCP3

Yet for years one of the favourite claims of those who deny the danger of global warming has been “No global warming since [insert start time here] !!!” They base the statement on the observed data of earth’s surface temperature or its atmospheric temperature. Then they claim that such a “pause” or “hiatus” in temperature increase disproves, in one fell swoop, everything about man-made climate change.

They seem a bit worried lately because it is very likely that the data from NOAA (National Oceanic and Atmospheric Administration) will record this year as the hottest on record; we won’t know, of course, until 2014 is complete. A single year, even if the hottest on record, has only a little to do with the validity of such claims, but a lot to do with how hard it is to sell the idea. Perhaps they dread the prospect that if the most recent year is the hottest on record — in any data set — it will put a damper on their claims of a “pause” in global warming. If they can’t claim that any more, it deprives them of one of their most persuasive talking points (whether true or not). Still the claims persist; they’ve even begun preparing to ward off genuine skepticism spurred by the hottest year on record.

I seem to be one of very few who has said all along, repeatedly and consistently, that I’m not convinced there has been what is sometimes called a “pause” or “hiatus,” or even a slowdown in the warming trend of global temperature — let alone in global warming.

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Record Arctic Sea-ice minimum 2012 declared – it’s the Silly Season!

In early August I posted my predictions for the “sceptical” response to the record sea ice minimum. Time to call myself to account. I had planned to do my own analysis, but John Mason at Skeptical Science has done such an excellent job of ploughing through the mountains of bullshit that I asked his permission to repost his comprehensive scorecard here…

The truth is incontrovertible. Panic may resent it, ignorance may deride it, malice may distort it, but there it is. Winston Churchill, 1916.

Late summer has long been known in media circles as the Silly Season, when any old story, embellished a bit here and a bit there, is trundled out to fill column space normally occupied by the graver matters of politics and business.

In the world of climate science, late summer is of course rather more important, marking the peak of the annual sea-ice melting season of the Northern Hemisphere, and this year has been extraordinary, with the canary in the coal mine tweeting louder than ever that something is seriously amiss with the climate.

With Arctic sea-ice having reached a record low extent, area and volume, several weeks ahead of the usual end-of-melt date, the Blogosphere has been ablaze with lengthy discussions of this event and its potential and worrisome ramifications. There have also been mass-outbreaks of denial accompanied by varying degrees of silliness, as one might expect when faced with an event like a record Arctic melt-out. Many commentators could see the meltdown approaching, both in the Arctic and around parts of the Blogosphere, with Gareth Renowden over at Hot Topic speculating in early August as follows:

“When Arctic sea ice area sets a new record low in the next couple of weeks, the usual suspects will say: “You can’t trust area, sea ice extent is the only valid metric“.

When Arctic sea ice extent sets a new record low in September, the following arguments will be run in parallel:

1) There will be a frantic search for a definition of extent in which a new record was not set

2) There will be a complaint that the satellite record has been blighted by the failure of a sensor and the calibrations needed to get a new sensor in operation have corrupted the record

3) It will be claimed that it was all caused by the major Arctic storm that hit in August, and thus can’t be attributed to global warming

4) It’s cyclical — it’s all happened before, in the 1930s, and is therefore nothing unusual

5) That it’s irrelevant, because it’s not global and not happening where anyone lives so can’t possibly matter.

When the sea ice extent and area anomalies blow out to record levels in early October because of the delayed freeze-up, there will be silence.

When the re-freeze starts, and the Arctic basin is covered in ice once more (early December), Anthony Watts will report on the record rate of ice formation, calling it a “stunning recovery“.”

They go on in strange paradox, decided only to be undecided, resolved to be irresolute, adamant for drift, solid for fluidity, all-powerful to be impotent. Winston Churchill, 1936.

How closely did Gareth’s predictions above conform to the reality on the media airwaves? In this post-minimum-declared Blogosphere round-up, we take a light-hearted look.

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The (un)principled sceptic

Over at Treadgold’s emporium, the owner is mining a rich vein of nonsense: he’s posting the letters to the editor the newspapers won’t print. One that caught my eye is from Professor Mike Kelly, a Cambridge nanotechnologist and climate sceptic who happens to hail from New Plymouth. Professor Kelly makes a good start:

It is perfectly possible to adopt a position, as I have, of ‘a principled climate science scepticism’.

Sounds good, doesn’t it? But a bit later on, in attempting to adduce evidence in support of his position he writes:

She [the author of the piece he’s complaining about] might like to look at the recent analysis by Pat Franks (sic) which tightens the conclusion that the anthropogenic contribution is at most 0.3°C per century. This concludes that it is rising temperatures that are increasing the atmospheric carbon dioxide, not the other way round.

Oh dear.

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