Climate: Arid lands also help sequester carbon

The Grand Canyon, bberwyn photo.

The Grand Canyon, bberwyn photo.

Researchers surprised by findings from Mojave desert

Staff Report

FRISCO — The world’s arid regions may be able to take up more carbon than previously thought, according to a new study based on detailed soil and carbon measurements from the Mojave Desert.

The research, led by a Washington State University biologist, will help develop a more accurate global carbon budget — how much carbon remains in the atmosphere as CO2, contributing to global warming, and how much gets stored in the land or ocean in other carbon-containing forms. Continue reading

Old trees key to forest carbon cycles

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Giant California redwood tree.

Study makes case for maintaining old-growth forests

By Summit Voice

FRISCO — Giant old trees play a key role in forest carbon cycles, researcher said this week, dispelling long-held misconceptions about the growth rate of trees.

In fact, trees never stop growing — as they age, their growth accelerates, even after they’ve reached massive sizes. This means that older trees play a substantial and disproportionate role in the Earth’s carbon cycle, one of the cycles that makes Earth capable of sustaining life.

The study, published in the journal Nature, was co-authored by University of Nebraska-Lincoln biologist Sabrina Russo. To reach their findings, the scientists analyzed biomass growth measurements of 673,046 trees belonging to 403 species from various temperate and tropical regions across six continents. Continue reading

Study: Fungi play key role in global carbon cycle

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The role of fungi must be considered in carbon models.

Interaction between plants, fungi and bacteria determine how much carbon is stored in soils

By Summit Voice

FRISCO — Certain types of fungi that live symbiotically with plants play a crucial role in the global carbon cycle by regulating how much carbon is stored by soils.

According to a new study by scientists with the University of Texas at Austin, Boston University and the Smithsonian Tropical Research Institute, the fungi have a bigger effect that most other factors, including including the amount of plant growth, temperature and rainfall.

Another recent study from Sweden also showed that mycorrhizal fungi are trapping the carbon deep in the ground as part of the process of nutrient exchange between the fungi and plant species. Continue reading

Climate study shows nuances in Arctic carbon cycle

Warmer seas don’t always take up more carbon

West Antarctic ice sheets

How will melting sea ice affect global carbon cycles? bberwyn photo.

By Summit Voice

FRISCO — As sea ice inexorably declines, the Arctic Ocean has started to absorb more carbon — by some as estimates, as much as one additional megaton each each, thanks to increased biological productivity.

But those effects are not spread evenly across the region, according to a new study that paints a nuanced picture of how global warming is changing the carbon cycle in the Arctic. The MIT research team modeled changes in Arctic sea ice, temperatures, currents, and flow of carbon from 1996 to 2007, and found that the amount of carbon taken up by the Arctic increased by 1 megaton each year.

But their detailed analysis found that some areas of the Arctic where temperatures have warmed the most are actually storing less carbon. Instead, these regions — including the Barents Sea, near Greenland — have become a carbon source, emitting carbon dioxide to the atmosphere. Continue reading

Extreme weather spurs classic climate feeback loop

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Climate feedback loops could have significant implications for agricultural production. bberwyn photo.

Extreme weather events alter carbon uptake by plants

By Summit Voice

FRISCO — Scientists often think about climate change in terms of how larger, ongoing atmosphere changes affect ecosystems on land and in the ocean, but a new study by German researchers shows that it works both ways.

In a classic climate feedback loop, the researchers determined that extreme weather events like like storms, heavy precipitation, as well as droughts and heat waves, prevent the uptake of 3 gigatons of carbon by global vegetation. Continue reading

Global warming: Earth is breathing more deeply these days

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Careful atmospheric measurement shows the annual carbon-dioxide cycle is amplifying.

‘A clear signal of widespread changes in northern ecosystems’

By Summit Voice

FRISCO — The Earth breathes in seasonal cycles, exhaling and inhaling great gulps of carbon dioxide as plant life goes through its annual cycle of growth.

And lately, those breaths have become up to 50 percent deeper, as more carbon dioxide is emitted from burning fossil fuels and other human activities, according to a study led by scientists at the Scripps Institution of Oceanography. Continue reading

Study challenges forest carbon cycle assumptions

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Forests alone won’t be able to soak up all the excess heat-trapping carbon dioxide in the atmosphere. bberwyn photo.

‘Nature cannot self-correct entirely against climate change …’

By Summit Voice

FRISCO — Massive reforestation efforts may help soak up a small part of the carbon dioxide generated by fossil fuel combustion, but it’s not a panacea for increasing concentrations of heat-trapping greenhouse gases.

Most widely accepted climate models have probably been over-estimating the ability of forests to absorb carbon from the atmosphere because the models do not represent the responses of soil microorganisms correctly, according to scientists with Northern Arizona University.

Their 11-year study showed that, contrary to expectations, high CO2 levels didn’t significantly increase carbon uptake. Plants did contain more carbon when CO2 levels were increased, but the soil actually lost carbon due to microbial decomposition; both factors essentially balanced one another out. Continue reading

Climate: Australian study tries to quantify the role of airborne dust in the global carbon cycle

A 2009 NASA satellite image shows dust blowing off the coast of Africa over the Atlantic Ocean.

A 2009 NASA satellite image shows dust blowing off the coast of Africa over the Atlantic Ocean.

FRISCO — airborne dust, blown off dry ground, is a significant source of atmospheric carbon, according to Australian researchers, who recently set out to try and calculate how that source figures into the global carbon cycle.

Subject to intensifying droughts in some parts of the world, top soil is increasingly being blown away as dust in the wind, changing the amount and location of soil carbon. Some carbon falls back to the ground while some leaves Australia or ends up in the ocean.

Dust also plays a more direct role in regional climate. One recent study led by scientists from the University of Wisconsin-Madison and NOAA suggested that a warming in the tropical North Atlantic was largely due to reductions in airborne dust and volcanic emissions during the past 30 years.

“Carbon stored in our soils helps sustain plant growth. Our modelling shows that millions of tonnes of dust and carbon are blowing away, and it is uncertain where all that ends up,” said Dr Adrian Chappell, of CSIRO, Australia’s national science agency. Continue reading

Climate: Do fungi drive the forest carbon cycle?

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A mushroom and spruce seedling grow intertwined in a Colorado forest. Bob Berwyn photo.

In some forests, up to 70 percent of carbon sequestration happens deep underground

By Summit Voice

FRISCO — Humble mushrooms may play a much greater role in regulating forest carbon cycles than previously understood, according to new research from Sweden.

Most scientific literature suggests that the plant matter in northern forests is responsible for sequestering atmospheric carbon, but after carefully analyzing numerous soil samples, the Swedish scientists concluded that mycorrhizal fungi, which live in association with plant roots, are trapping the carbon deep in the ground as part of the process of nutrient exchange between the fungi and plant species. Continue reading

Environment: USGS researchers quantify carbon sequestration in western ecosystems

Forests, grasslands play important role in carbon cycle

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New study to help inform resource management. Bob Berwyn photo.

By Summit Voice

SUMMIT COUNTY — Western forests, grasslands, shrublands and other ecosystems sequester about 100 million tons of carbon each year, equivalent to about 5 percent of the nation’s total annual greenhouse gas emissions, according to a new report released this week by the U.S. Department of Interior.

“This important study confirms the major role that our natural landscapes have in absorbing carbon and helping to counter-balance the nation’s carbon emissions,” said Deputy Secretary of the Interior David J. Hayes. “This kind of groundbreaking science not only will help us be more effective stewards of our lands, but it also helps reveal how our forests, wetlands and rangelands in the West — and throughout the nation — are positively impacting the carbon cycle.” Continue reading

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