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Global land carbon sink response to temperature and precipitation varies with ENSO phase
Environmental Research Letters
  • Yuanyuan Fang, Carnegie Institution for Science
  • Anna M. Michalak, Carnegie Institution for Science
  • Christopher R. Schwalm, Woods Hole Research Center
  • Deborah N. Huntzinger, Northern Arizona University
  • Joseph A. Berry, Carnegie Institution for Science
  • Philippe Ciais, Laboratoire des Sciences du Climat et de l’Environnement
  • Shilong Piao, Peking University
  • Benjamin Poulter, Montana State University
  • Joshua B. Fisher, California Institute of Technology
  • Robert B. Cook, Oak Ridge National Laboratory
  • Daniel Hayes, University of Maine
  • Maoyi Huang, Pacific Northwest National Laboratory
  • Akihiko Ito, National Institute for Environmental Studies
  • Atul Jain, University of Illinois at Urbana-Champaign
  • Huimin Lei, Tsinghua University
  • Chaoqun (Crystal) Lu, Iowa State University
  • Jiafu Mao, Oak Ridge National Laboratory
  • Nicholas C. Parazoo, California Institute of Technology
  • Shushi Peng, Peking University
  • Daniel M. Ricciuto, Oak Ridge National Laboratory
  • Xiaoying Shi, Oak Ridge National Laboratory
  • Bo Tao, University of Kentucky
  • Hanqin Tian, Auburn University
  • Weile Wang, National Aeronautics and Space Administration
  • Yaxing Wei, Oak Ridge National Laboratory
  • Jia Yang, Auburn University
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Climate variability associated with the El Niño-Southern Oscillation (ENSO) and its consequent impacts on land carbon sink interannual variability have been used as a basis for investigating carbon cycle responses to climate variability more broadly, and to inform the sensitivity of the tropical carbon budget to climate change. Past studies have presented opposing views about whether temperature or precipitation is the primary factor driving the response of the land carbon sink to ENSO. Here, we show that the dominant driver varies with ENSO phase. Whereas tropical temperature explains sink dynamics following El Niño conditions (r TG,P = 0.59, p < 0.01), the post La Niña sink is driven largely by tropical precipitation (r PG,T = −0.46, p = 0.04). This finding points to an ENSO-phase-dependent interplay between water availability and temperature in controlling the carbon uptake response to climate variations in tropical ecosystems. We further find that none of a suite of ten contemporary terrestrial biosphere models captures these ENSO-phase-dependent responses, highlighting a key uncertainty in modeling climate impacts on the future of the global land carbon sink.


This article is published as Fang, Y., A. A. Michalak, C. Schwalm, D. Huntzinger, J. Berry, P. Ciais, S. Piao, B. Poulter, J. Fisher, R. Cook, D. Hayes, M. Huang, A. Ito, A. Jain, H. Lei, C. Lu, J. Mao, N. Parazoo, S. Peng, D. Ricciuto, X. Shi, B. Tao, H. Tian, W. Wang, Y. Wei, and J. Yang. 2017. Global land carbon sink response to temperature and precipitation varies with ENSO phase. Environmental Research Letters, 12(6), [064007]. DOI: 10.1088/1748-9326/aa6e8e.

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Yuanyuan Fang, Anna M. Michalak, Christopher R. Schwalm, Deborah N. Huntzinger, et al.. "Global land carbon sink response to temperature and precipitation varies with ENSO phase" Environmental Research Letters Vol. 12 Iss. 064007 (2017)
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