Corralling the carbon cycle( Stanford CAScientists may have overc...)

Stanford, CAScientists 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 photosynth
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