Little Ice Age: It Was Not the Sun

Sadly this post is a bit of a joke. This sort of paper comes out at least once a month. People just really, really want to believe this it seems. They are slowly getting more convincing, but as you can see in the paper, the timing doesn't exactly match very well. Some of the changes occur rather a long time after the earliest eruption, which throws their whole thesis in serious doubt. If the plant disasters they claim indeed occurred at the dates claimed, why isn't that massive sudden cooling in the history books along with a few revolutions occurring at those dates ? Why did the cooling last so much longer than similar volcanic eruptions ? At the very least they're missing something, at worst, they're just wrong.

They're also invoking feedback effects. That's cute, but feedback effects obviously never cause anything, it's a cop-out. This sort of claim gets weaker and weaker once you realize that they claim a tiny, tiny effect (slight albedo reduction, a sort of (tiny) "nuclear winter" caused by volcanoes) and everything else followed by necessity (it cooled further because it was cooling. Great ! If so, why did it stop ? No answer).

What this paper claims is that the little ice age occurs in simulations of their events, after tweaking the values a few times. Which values ? They need to rather greatly prolong the expected cooling a volcanic eruption causes. Great. But the Mauder minimum just happens to coincide really really well with the little ice age. And the timing matches a lot better than their volcanoes. Is that just a coincidence ? Nobody really thinks so, and this will be one of the many papers that fails to convince people of that fact.

If this paper is true, that little ice age should probably be classified as a "false start" of a real one. It tried to start and sure enough, temperatures started dropping (enough to cause the extinction of several countries), but for some reason that this paper doesn't go into, it didn't happen (and the modern world wouldn't have happened if it did, we'd be back in the stone age if not extinct instead of on the moon). The feedback loop cooling the planet got triggered, ran for a while, and then just... died. Why ? It doesn't seem to have had any false starts the previous times. In fact this feedback system has proven extremely unstoppable in the past, including a few times with a massive co2 increase, which failed to halt temperature drops (at least in the long term it failed, in the short term we're guessing). They could at least have said something akin to that the sun may not have started the little ice age, but it looks like it ended it (at least the Sun may have sufficient power to do so).

That's another bit of an elephant in the room. It is "about time" (give or take 5000 years) for another huge ice age to start. Was the little ice age a "false start" ? If it is, that seems a rather unique event. We don't yet know what causes ice ages (and no, it's not an iceberg blocking the gulf stream as half of the internet seems to believe, that would suck for Europe, as last years' UK snow disasters would become yearly events, and rock for Canada (unless Canadians like skiing), but it doesn't really change temperatures). We just know that ice ages happen with alarming regularity in the past, and that their alarm clock is about to go off.

Regardless, this paper is one of many with this claim, and it's not exactly better than most. They have some new, real-world data which is rather unique, but otherwise...

There's another problem I'd like to point out about these simulations. They show us the real nature of causality. No one cause "causes" something else. In this paper the "cause" of global cooling during the middle ages is "a number" of volcanic eruptions, which activated a number of physical effects due to their location and their distribution, which were followed after a century and a half by another 3 volcanic eruptions, and the warming between the two caused a change in ocean salinity in one or two layers of the ocean, which coupled with the geometry of the ocean floor diverted warm water flows in the atlantic (yet somehow managed to affect both China and South America). This chain of events was "the cause", according to the paper. In other words, about a dozen relatively independent events, combined with 4 or 5 inconvenient physical changes which just happened to occur at just the right time (also relatively independent). And the sun may still have had a role in the changes.That's a fucking boatload of causes. Normally you'd say "what are the chances of this seriously happening ?".

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/25RtfBY0G2w/little-ice-age-it-was-not-the-sun

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