TY - JOUR
T1 - Accelerating rates of arctic carbon cycling revealed by long-term atmospheric CO2 measurements
AU - Jeong, Su Jong
AU - Bloom, A. Anthony
AU - Schimel, David
AU - Sweeney, Colm
AU - Parazoo, Nicholas C.
AU - Medvigy, David
AU - Schaepman-Strub, Gabriela
AU - Zheng, Chunmiao
AU - Schwalm, Christopher R.
AU - Huntzinger, Deborah N.
AU - Michalak, Anna M.
AU - Miller, Charles E.
N1 - Funding Information:
This work was funded by the Korea Meteorological Administration Research and Development Program under grant KMI2018-03711. Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Part of this research was supported by the Carbon in Arctic Reservoirs Vulnerability Experiment, an Earth Ventures (EV-S1) investigation, under contract with NASA. C.Z. was supported by the National Key R&D Program of China (grant no. 2016YFC0402806). G.S. was supported by the University of Zurich research priority program on Global Change and Biodiversity (URPP GCB). Funding for the MsTMIP (http://nacp.ornl.gov/MsTMIP.shtml) activity was provided through NASA ROSES grant #NNX10AG01A. Data management support for preparing, documenting, and distributing MsTMIP model output data was performed by the Modeling and Synthesis Thematic Data Center at Oak Ridge National Laboratory (ORNL; http:// nacp.ornl.gov), with funding through NASA ROSES grant #NNH10AN681. Finalized MsTMIP data products are archived at the ORNL DAAC (http://daac.ornl.gov). This study was part of NASA’s Arctic-Boreal Vulnerability Experiment.
Publisher Copyright:
Copyright © 2018 The Authors.
PY - 2018/7/11
Y1 - 2018/7/11
N2 - 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 (DCO2), indicating long-term changes in seasonal carbon uptake and respiration. Using a carbon balance model constrained by DCO2, 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.
AB - 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 (DCO2), indicating long-term changes in seasonal carbon uptake and respiration. Using a carbon balance model constrained by DCO2, 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.
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U2 - 10.1126/sciadv.aao1167
DO - 10.1126/sciadv.aao1167
M3 - Article
C2 - 30009255
AN - SCOPUS:85050078220
SN - 2375-2548
VL - 4
JO - Science Advances
JF - Science Advances
IS - 7
M1 - eaao1167
ER -