Corralling the carbon cycle

Nov 13, 2008
Corralling the carbon cycle
NASA’s Atmospheric Infrared Sounder (AIRS) instrument on the Aqua spacecraft is used to observe carbon dioxide in the atmospheric. This image shows CO2 over the United States in July 2003. High concentrations of the greenhouse gas are red, while low concentrations are blue. Image courtesy NASA

(PhysOrg.com) -- Scientists may have overcome a major hurdle to calculating how much carbon dioxide (CO2) is absorbed and released by plants, vital information for understanding how the biosphere responds to stress and for determining the amount of carbon that can be safely emitted by human activities. The problem is that ecosystems simultaneously take up and release CO2. The key finding is that the compound carbonyl sulfide, which plants consume in tandem with CO2, can be used to quantify gas flow into the plants during photosynthesis. The research is published in the November 14, issue of Science.

“In photosynthesis, plants ‘breath’ in carbon dioxide from the atmosphere and, with sunlight energy, convert it and water into food and oxygen, which they then ‘exhale,’” explained co-author Joe Berry from the Carnegie Institution’s Department of Global Ecology. “In ecosystems, plants and other organisms respire producing carbon dioxide. We can measure the net change in CO2, but we do not have an accurate way to measure how much is going in or out and how this is affected by climate. Understanding this photosynthesis-climate feedback riddle is key to understanding how climate change may affect the natural processes that are a sink for human-made carbon emissions.”

Previous laboratory research showed that carbonyl sulfide is taken up in step with photosynthesis. But unlike CO2, there is no emission of carbonyl sulfide from plants.

The researchers compared atmospheric measurements of carbonyl sulfide over North American during the growing season with two simulations of an atmospheric transport model. The airborne observations, from the Intercontinental Chemical Transport Experiment-North America, also measured CO2. They combined that data with results from laboratory experiments that looked at gas exchange at the leaf level.

“We’ve always looked at the total change in CO2, but now we can look for the influence of photosynthesis on this total change,” remarked lead author Elliott Campbell a former Carnegie postdoctoral researcher, currently at UC Merced. “Our approach, based on the relation of carbonyl sulfide to photosynthesis, gives us this unique ability.”

With the new inputs, the researchers ran their simulations, which consider plant uptake, soil and ocean absorption, human-made emissions and how the gases flow through these systems. The simulations showed that the magnitude of the plant uptake was much larger than other sources and sinks at a continental scale during the growing season, which is important for using the compound to trace photosynthesis.

“The intriguing outcome of this study is that an inverse analysis of the atmospheric carbonyl sulfide measurements may be used to quantify the carbon released during plant respiration,” remarked Berry. “That key missing piece has been a thorn in the side of carbon-cycle research for years.”

Provided by Carnegie Institution

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User comments : 4

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GrayMouser
5 / 5 (2) Nov 13, 2008
The picture is useless without a scale to go with the colors. What are the concentrations? At what altitudes?
Velanarris
3.7 / 5 (3) Nov 14, 2008
The article is rather useless as well as there's either a typo, or the quoted gentleman was trying to talk about two different processes as one here:

%u201CIn photosynthesis, plants %u2018breath%u2019 in carbon dioxide from the atmosphere and, with sunlight energy, convert it and water into food and oxygen, which they then %u2018exhale,%u2019%u201D explained co-author Joe Berry from the Carnegie Institution%u2019s Department of Global Ecology. %u201CIn ecosystems, plants and other organisms respire producing carbon dioxide. We can measure the net change in CO2, but we do not have an accurate way to measure how much is going in or out and how this is affected by climate. Understanding this photosynthesis-climate feedback riddle is key to understanding how climate change may affect the natural processes that are a sink for human-made carbon emissions.%u201D


CWFlink
5 / 5 (1) Jul 02, 2009
Consider the phrase "plants and other organisms respire producing carbon dioxide"; change 'respire' to 'expire' (i.e. die).

Then the quote makes some sense.

Also, consider:
http://www.physor...929.html

Which implies that "weathering of stones", enhanced by the activity of plant life, is a significant natural way to reduce CO2 levels. And goes on to imply that when CO2 levels fall below 250 ppm, "starvation" of plant life slows the weathering process significantly.

Taken together, these two articles suggest that plant life reduces CO2 levels through TWO processes... photosynthesis and "weathering", which work to multiply the impact of plants on reducing CO2 levels.

We may well find that rising CO2 levels will level off as plants catch up and balance our emissions with photosynthesis and "weathering".
Velanarris
3 / 5 (1) Jul 02, 2009
Well the "weathering" is actually the uptake of vital nutrients for plant growth (mainly Iron and nitrous photosynthetic intermediates). In plants you can increase fertilizer as much as you want, but if you're lacking a single nutrient (like carbon) the growth is slowed.

Conversely, if you increase the carbon, when the plants are already in a carbon rich environment, growth will not be affected, begin fertilizing, and excess carbon (if lacking) will assist plant growth.

As with all things in nature, it's a balancing act.