Researchers find decaying biomass in Arcticrivers fuels more carbon export than previously thought PNASNews
A new study led by Florida State University researchers found that plants andin Arctic rivers could be responsible for more than half the particulate organic matter flowing to the Arctic Ocean. That's a significantly greater proportion than previously estimated, and it has implications for how much carbon gets sequestered in the ocean and how much moves into the atmosphere.
"When people thought about these major Arctic rivers and many other rivers globally, they tended to think of them as sewers of the land, exporting thefrom primary production and decomposition on land" said Rob Spencer, a professor in the Department of Earth, Ocean and Atmospheric Science."This study highlights that there's a lot of life in these rivers themselves and that a lot of the organic material that is exported is coming from production in the rivers.
The researchers looked at the six major rivers flowing in the Arctic Ocean: The Yukon and Mackenzie in North America, and the Ob', Yenisey, Lena and Kolyma in Russia. Using data collected over almost a decade, they built models that used the stable and radioactive isotope signatures of carbon and the carbon-to-nitrogen ratios of the particulate organic matter to determine the contribution of possible sources to each river's chemistry.
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