Accelerating rates of Arctic carbon cycling revealed by long-term atmospheric CO2 measurements

Science Advances
Su-Jong JeongCharles Miller

Abstract

The contemporary Arctic carbon balance is uncertain, and the potential for a permafrost carbon feedback of anywhere from 50 to 200 petagrams of carbon (Schuur et al., 2015) compromises accurate 21st-century global climate system projections. The 42-year record of atmospheric CO2 measurements at Barrow, Alaska (71.29 N, 156.79 W), reveals significant trends in regional land-surface CO2 anomalies (ΔCO2), indicating long-term changes in seasonal carbon uptake and respiration. Using a carbon balance model constrained by ΔCO2, we find a 13.4% decrease in mean carbon residence time (50% confidence range = 9.2 to 17.6%) in North Slope tundra ecosystems during the past four decades, suggesting a transition toward a boreal carbon cycling regime. Temperature dependencies of respiration and carbon uptake suggest that increases in cold season Arctic labile carbon release will likely continue to exceed increases in net growing season carbon uptake under continued warming trends.

References

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Citations

Jun 21, 2018·Ecological Applications : a Publication of the Ecological Society of America·A David McGuireZhiliang Zhu
Jan 15, 2020·Science Advances·Jin-Soo KimGabriela Schaepman-Strub
May 18, 2020·Global Change Biology·Kai WangShilong Piao
Sep 2, 2020·Global Change Biology·Hoonyoung ParkJosep Peñuelas
Aug 21, 2020·Proceedings of the National Academy of Sciences of the United States of America·Xin LinGretchen Keppel-Aleks
May 3, 2021·Global Change Biology·Kai WangAnping Chen
Aug 13, 2021·Proceedings of the National Academy of Sciences of the United States of America·Lei HuParvadha Suntharalingam
Jan 16, 2022·Scientific Reports·Marta MagnaniAntonello Provenzale

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