Ilmastonmuutos

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Rasmus-mafioso
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Ilmastonmuutos

#1 Post by Rasmus-mafioso » 04 Aug 2014, 23:44

Nyt kun on ollut noita hyvän mielen topicceja Ukrainasta, Gazasta ja Irakista niin laitetaan välillä tällastakin.
VICE wrote:If We Release a Small Fraction of Arctic Carbon, 'We're Fucked': Climatologist

This week, scientists made a disturbing discovery in the Arctic Ocean: They saw "vast methane plumes escaping from the seafloor," as the Stockholm University put it in a release disclosing the observations. The plume of methane—a potent greenhouse gas that traps heat more powerfully than carbon dioxide, the chief driver of climate change—was unsettling to the scientists.

But it was even more unnerving to Dr. Jason Box, a widely published climatologist who had been following the expedition. As I was digging into the new development, I stumbled upon his tweet, which, coming from a scientist, was downright chilling:
If even a small fraction of Arctic sea floor carbon is released to the atmosphere, we're f'd.
Box, who is currently a professor of glaciology at the Geological Survey of Denmark and Greenland, has been studying the Arctic for decades. His accolade-packed Wikipedia page notes that he's made some 20 expeditions to the Arctic since 1994, and served as the lead author on the Greenland section of NOAA's State of the Climate report from 2008-2012. He also runs the Dark Snow project and writes about the latest findings in the field at his blog, Meltfactor.

In other words, Box knows the Arctic, and he knows climate change—and the methane plumes had him blitzed enough to bring out the F bombs.

Now, the scientists in the Arctic didn't fully understand why the plumes were occurring. But they speculated that a warmer "tongue" of ocean current was destabilizing methane hydrates on the Arctic slope.

I called the scientist at his office in Copenhagen, and he talked frankly and emphatically about the new threat, and about the specter of climate change in general. He also swore like a sailor, which I've often wondered how climatologists refrain from doing, given the urgency of the problem—it's certainly an entirely accurate way to communicate the climate plight.

First of all, I asked Box if he stood by that tweet. He did. He'd revise it a bit, to include surface carbon—methane locked in the permafrost that's also beginning to leak out—because if we loose enough of either, we're in trouble.

"Even if a small fraction of the Arctic carbon were released to the atmosphere, we're fucked," he told me. What alarmed him was that "the methane bubbles were reaching the surface. That was something new in my survey of methane bubbles," he said.

"The conventional thought is that the bubbles would be dissolved before they reached the surface and that microorganisms would consume that methane, and that's normal," Box went on. But if the plumes are making it to the surface, that's a brand new source of heat-trapping gases that we need to worry about.

The scientists on the expedition confirm that's what we're seeing, too:

"We are 'sniffing' methane," Ulf Hedman, the science coordinator of the Swedish Polar Research Secretariat, wrote in a post highlighted by Climate Change SOS. "We see the bubbles on video from the camera mounted on the CTD or the Multicorer. All analysis tells the signs. We are in a Mega flare. We see it in the water column, we read it above the surface, and we follow it up high into the sky with radars and lasers. We see it mixed in the air and carried away with the winds. Methane in the air."

"Methane is more than 20 times more potent than CO2 in trapping infrared as part of the natural greenhouse effect," Box said. "Methane getting to the surface—that's potent stuff."

It's especially worrying because the Arctic is warming faster than nearly anywhere else on Earth. Now, along with melting sea ice and thawing permafrost, we have to add to our list of 'feedback loop' concerns that warming Arctic oceans may be releasing fonts of methane. That is, the warmer the ocean gets, the more methane gets spewed out of those stores on the continental shelf, and the warmer the ocean gets, ad infinitum.

"The Arctic is our most immediate carbon concern," Box continued. There is an immense amount of carbon stored there. "It's a giant number. But we should think in terms of, even if a small amount of that carbon comes out, that's a problem."

Box, who hails from Colorado, relocated to Denmark in part to escape the impending impacts of climate change. "Droughts are going to be a problem for the interior states," he said. "I'm a bit of climate refugee." Because the Arctic methane plumes, of course, are just another worrying source of a global phenomenon that is rapidly approaching the brink of irreversibility.

"We're on a trajectory to an unmanageable heating scenario, and we need to get off it," he said. "We're fucked at a certain point, right? It just becomes unmanageable. The climate dragon is being poked, and eventually the dragon becomes pissed off enough to trash the place."

It was refreshing to hear a climatologist pull no punches, while still eloquently and accurately summarizing the science—even though an increasing number are becoming proactive, like the paleoclimatologist Dr. Michael Mann, and top climate scientist Dr. James Hansen, climate scientists are still learning how to engage the public in a manner that's forceful and compelling. Like Dr. Hansen, Box has a deeply personal reason to sound the alarm.

"I may escape a lot of this," he said, "but my daughter might not. She's 3 years old." Climate change may not destabilize the globe in our lifetime, or even his daughter's—but the fact that feedback loops like methane release could rapidly accelerate the warming means that there's a chance rapid climate transformation—and the social and economic catastrophes that would likely accompany it—could strike sooner.

"If you stand to lose everything, then even a low probability event is high-risk. That's why people fund armies—just in case they get invaded. We need to invest in decarbonizing our energy system." He paused, then added:

"We've got to keep this fucking carbon in the ground."
IFLScience wrote:Scientists Think They May Have Solved The Siberian Crater Mystery

Image
Photo credit: Scientific Centre of Arctic Studies in Salekhard. The newly discovered Siberian crater is filled with methane, indicating it was caused by the release of gas from thawing permafrost.



Air samples taken at the bottom of one of the craters that have recently appeared in Siberia seem to support fears that the hole was formed by methane released from melting permafrost. If so this is very bad news for the planet's future, indicating frighteningly high emissions of the powerful greenhouse gas.

An expedition from the Scientific Center of Arctic Studies found methane concentrations of 9.6% at the bottom of the crater – 50,000 times the atmospheric average. The possibility that methane released by melting permafrost produced the crater had been a favored hypothesis from its discovery in mid-July. Nevertheless, plenty of other theories were circulating, and scientists urged caution before leaping to conclusions.

The extraordinary concentration of methane, on the other hand, seems unlikely to be a coincidence, particularly since methane is slightly lighter than air. The 2012 and 2013 summers on the Yamal peninsular, where the crater is, were around 5°C warmer than normal.

Expedition leader Andrei Plekhanov told Nature that the high temperatures probably thawed the permafrost to the point where it collapsed, releasing the trapped methane.

A competing theory holds that a single warm season, or even two, would not be enough to create such a deep hole. Hans-Wolfgang Hubberten of the Alfred Wegener Institute points to a 2°C warming at a depth of 20 meters in Arctic permafrost as a result of Global Warming over the last 20 years.

Hubberten's theory is that a thick layer of ice trapped methane released as the soil below thawed. “Gas pressure increased until it was high enough to push away the overlying layers in a powerful injection, forming the crater,” he told Nature.

While Hubberten says he has never seen a crater like this before, two smaller ones have been reported in the weeks since it was found. This does not mean that these craters have formed in that time. One was seen to form in September 2013, although eyewitness accounts of what happened vary. It is not known when the other appeared.

Establishing the method by which the crater forms is important, as it might provide ways to warn local villagers, or the operators of the nearby Bovanenkovskoye gas field, if a crater is about to appear somewhere dangerous.

The most serious question is what this means for the release of methane from the tundra. Methane is a much more potent greenhouse gas than carbon dioxide – traditionally estimated as 25 times, but the most recent IPCC report raised this to 34 times over a 100 year period. The possibility of warming releasing Arctic methane has been the most publicized of the possible scenarios for runaway climate change even if human emissions become controlled, although some have questioned the doomsday scenarios.

Plekhanov is keen to return to the crater to measure methane trapped in the walls, both to settle the question of the process that led to its formation and gain an idea of how much methane is being released.


"It's all been a huge mistake. My modest conclusion is that Western civilization has been constructed on a perverse and mistaken idea of human nature. Sorry, beg you pardon; it was all a mistake. It is probably true, however, that this perverse idea of human nature endangers our existence."
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Paitsi Ilkka
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Re: Ilmastonmuutos

#2 Post by Paitsi Ilkka » 04 Aug 2014, 23:52

Juu. Varmaan joku jaksaa lukea. Itsehän olen korostanut jo merenpinnannousu-topicin ajoista adaptaation ja varautumisen merkitystä.
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Re: Ilmastonmuutos

#3 Post by Rasmus-mafioso » 04 Aug 2014, 23:55

Abortoimaton susi wrote:Juu. Varmaan joku jaksaa lukea. Itsehän olen korostanut jo merenpinnannousu-topicin ajoista adaptaation ja varautumisen merkitystä.
Jeh, toisaalta holoseenikauden loppumiseen voi olla vaikea varautua muuten kuin palauttamalla adaptaation merkitystä siihen millä ihmiset on eläneet myös ennen holoseenikautta.
Ananaskääpiö wrote: Miksi jengi on niin saatanan tyhmää?

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Re: Ilmastonmuutos

#4 Post by Vitun pilkkijä homo » 04 Aug 2014, 23:56

tiivistäkään tämä muutamalla sanalla suomeksi kiitos!

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Re: Ilmastonmuutos

#5 Post by Hans Normaali » 04 Aug 2014, 23:58

Nääh, musaa kovemmalle. :smoker:
NINJA PO VENSKA!

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Re: Ilmastonmuutos

#6 Post by Rasmus-mafioso » 05 Aug 2014, 00:00

Siinähän se tuli.
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Re: Ilmastonmuutos

#7 Post by Elmeri suosittelee » 05 Aug 2014, 00:11

tsih-kaheksas koffi auki wrote:tiivistäkään tämä muutamalla sanalla suomeksi kiitos!
merenpohjas oleva metaani on karkaamassa ja jos se pääsee ilmakehään asti niin ollaan kusessa sanoo maailman arvostettu ilmastontutkija Box :bounce:
minä en nettikiusaa! Image

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Re: Ilmastonmuutos

#8 Post by Longhaired wyrdo » 05 Aug 2014, 00:18

No ni, se siitä sit. So long & thanks for all the fish.
PERKELEEN TONTUT!

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Re: Ilmastonmuutos

#9 Post by oopperan ummetus » 05 Aug 2014, 00:21

joo rip vaan kaikki jne
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Marx propagoi fiksuuttaan lukemalla kirjoja ja kirjoittamalla niitä. Bakunin taas tuhosi aivosolujaan alkoholilla. Jäljellejääneet aivosolut saivat tilaa kasvaa ja kehittyä, ja lopulta Bakuninin pääkopassa oli vain yksi helvetin iso ja fiksu aivosolu. Bakunin oli siis fiksumpi kuin Marx. 

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Re: Ilmastonmuutos

#10 Post by Vitun pilkkijä homo » 05 Aug 2014, 00:23

samaa tavaraahan tulee lehmien perseestä, tapetaan kaikki lehmät

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Re: Ilmastonmuutos

#11 Post by Rasmus-mafioso » 05 Aug 2014, 00:25

tsih-kaheksas koffi auki wrote:samaa tavaraahan tulee lehmien perseestä, tapetaan kaikki lehmät
Vanha kunnon soihdut ja talikot vaan karjatiloille niin ongelma ratkaistu. :smoker:
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Re: Ilmastonmuutos

#12 Post by Rasmus-mafioso » 05 Aug 2014, 00:29

Laitan nyt tän tähän ja meen nukkuu. Kaljat ja röökitkin loppu :x

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Re: Ilmastonmuutos

#13 Post by Super Dario Fo Fighters » 05 Aug 2014, 00:32

Metaani on ihan hyvää jos sen maustaa hyvin.
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Re: Ilmastonmuutos

#14 Post by hailander » 05 Aug 2014, 01:08


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Re: Ilmastonmuutos

#15 Post by Super Dario Fo Fighters » 05 Aug 2014, 02:37

Toisaalta Nasan mukaan Em Drive toimii, vaikka kukaan ei tajuu mix. Nyt vaan sitten muuttopuuhiin, iham paska tää planeetta joka tapauksessa.

http://guardianlv.com/2014/08/nasa-look ... ce-travel/
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