CORVALLIS, Ore. – Nearly half of the organic carbon stored in soil around the world is contained in Arctic permafrost, which has experienced rapid melting, and that organic material could be converted to greenhouse gases that would exacerbate global warming.
When permafrost thaws, microbial consumption of those carbon reserves produces carbon dioxide – much of which eventually winds up in the atmosphere, but scientists have been unsure of just how the system works.
A new study published this week in Nature Communications outlines the mechanisms and points to the importance of both sunlight and the right microbial community as keys to converting permafrost carbon to CO2. The research was supported by the U.S. National Science Foundation and the Department of Energy.
“We’ve long known that microbes convert the carbon into CO2, but previous attempts to replicate the Arctic system in laboratory settings have failed,” noted Byron Crump, an Oregon State University biogeochemist and co-author on the study. “As it turns out, that is because the laboratory experiments did not include a very important element – sunlight.”
“When the permafrost melts and stored carbon is released into streams and lakes in the Arctic, it gets exposed to sunlight, which enhances decay by some microbial communities, and destroys the activity for other communities. Different microbes react differently, but there are hundreds, even thousands of different microbes out there and it turns out that the microbes in soils are well-equipped to eat sunlight-exposed permafrost carbon.”
The research team from Oregon State and the University of Michigan was able to identify compounds that the microbes prefer using high-resolution chemistry and genetic approaches. They found that sunlight makes permafrost soils tastier for microbes because it converts it to the same kinds of carbon they already like to eat – the carbon they are adapted to metabolize.
“The carbon we’re talking about moves from the soil into rivers and lakes, where it is completely exposed to sunlight,” Crump said. “There are no trees and no shade, and in the summer, there are 24 hours a day of sunlight. That makes sunlight potentially more important in converting carbon into CO2 in the Arctic than in a tropical forest, for example.”
As the climate continues to warm, there are interesting ramifications for the Arctic, said Crump, who is a faculty member in OSU’s College of Earth, Ocean, and Atmospheric Sciences.
“The long-term forecast for the Arctic tundra ecosystem is for the warming to lead to shrubs and bigger plants replacing the tundra, which will provide shade from the sunlight,” Crump said. “That is considered a negative feedback. But there also is a positive feedback, in that seasons are projected to expand. Spring will arrive earlier, and fall will be later, and more water and carbon will enter lakes and streams with more rapid degradation of carbon.
“Which feedback will be stronger? No one can say for sure.”
The stakes are high, Crump said. There is more carbon stored in the frozen permafrost than in the atmosphere. It has accumulated over millions of years by plants growing and dying, with a very slow decaying process because of the freezing weather.
“Some of the organic matter is less tasty to microbes than others,” Crump said, “but bacterial communities are diverse, so there will be something out there that wants that energy and will use it.”
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The paper: https://www.nature.com/articles/s41467-017-00759-2
Yet another irrelevant strawman, given the finite, but weak, effect CO2 has on the climate.
Well, I guess no one ever accused climastrologists of being too smart. This is so easy that a 3rd grader could understand it.
That organic-rich soil represents a net sequestration of CO2 by primary production during the warmest periods of interglacial periods. If the permafrost thaws because the regional climate becomes as warm as it was during the warmest period of interglacials and primary production can once again take place, what will the net movement of carbon be, in or out of the soil. 3rd graders would correctly answer that the net flow of carbon will be into the soil, climatstrologists will herp, then derp, and probably come up with the wrong answer.
Okay. Crump, et al.. Back to basics (you clearly need them).
1. Re:
Prove it.
So far, there is not one observation to support this conjecture.
What is there?
Failed, utterly failed, as in unfit for purpose, unskilled, climate models.
See Bob Tisdale’s free e book: Climate Models Fail
Furthermore,
there is anti-correlation data, now. Over 19 years of it:
CO2 UP. WARMING NOT.
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2. See above comments for many basic geology, biology, and chemistry principles you would do well to study.
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Okay, seriously. I realize you could not be that ignorant. That leaves all of us wondering….
How in the world do you face yourselves in the mirror each day? “There stands a fr@ud.” or “I lie for a living.” couldn’t do much for the ol’ ego….. or could they?…….
Sunlight and the right plants can convert arctic carbon into oxygen. But which things will actually happen?
I wonder how long it required and how many repeated opportunities it took for biology to become this efficient at scavenging carbon from ice. I also wonder how they managed to survive before the SUVocene epoch.
As a geologist who has done extensive fieldwork in the Precambrian of northern Canada since the 1950s, the amount of overburden (loose materials on top of bedrock) averages a few meters and most of this is sterile glacial debris of sand, gravel, boulders, silt and rock flour with from zero to a sparing several centimeters of mossy soil which is in the active layer which freezes and thaws each year
There are patches of wet bog land to be sure but there is also extensive bare granite terrain continuously for hundreds of square kilometers – a joy to traverse over except for the lack of drinking water. Many a time on a hot sunny July day, I have had to make do with water scooped out of moose or caribou tracks in a small pan depression bog in the granite.
It was already the color if tea, but we boiled it up in a small tea pail and threw in a small palm of tea for aesthetic reasons and to divert our attention from occasional “droppings” picked out of the water. Watching the water bugs swim in interesting patterns to try to stay cool, ever faster until the end before the amber fluid began to bubble and then tumble before the tea was thrown in.
I’m sorry, University of Arizona, but most of your thawing permafrost in Canada is in solid rock with lesser amounts in sand and gravelly glacial till. Russia has some deeper stuff in places and I notice that all your examples from the alarmosphere are in Russia, but you always include the permafrost map of Canada in your picture. Ditto Greenland. Let’s start by chopping your figures by about 75%. I hope your study of the atmosphere includes going into the field You already have to reduce the air warming progs by about 75%. Maybe this number would be a useful coefficient in Climateering.
Several years ago on one of the “nature” channels an environmental group was filming the
disaster of the melting permafrost in the tundra. A couple of Alaskan guides were leading them. The voice over kept talking about the disaster of the advancing timberline into the Arctic Tundra. All this as they were all walking through the remnants of a old tree line with stumps, and denuded trees all around them. The guides obviously noticed the contradiction but not the camera crew or environmentalists or whoever edited the piece.
“Some of the organic matter is less tasty to microbes than others,” Crump said, “but bacterial communities are diverse, so there will be something out there that wants that energy and will use it.”
It’s been 50 years since my last biology class, so maybe someone can help me out here and explain for me exactly where the tastebuds are located on these Arctic soils bacteria species.
A fine comment by urederra:
”
Dunno. One might think that if permafrost “melts” it would be more land for trees to grow.”
was mis-posted on the tree DNA thread here:
https://wattsupwiththat.com/2017/10/06/trees-to-be-barcoded/comment-page-1/#comment-2629661