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Title: Dependence of the evolution of carbon dynamics in the northern permafrost region on the trajectory of climate change

We conducted a model-based assessment of changes in permafrost area and carbon storage for simulations driven by RCP4.5 and RCP8.5 projections between 2010 and 2299 for the northern permafrost region. All models simulating carbon represented soil with depth, a critical structural feature needed to represent the permafrost carbon–climate feedback, but that is not a universal feature of all climate models. Between 2010 and 2299, simulations indicated losses of permafrost between 3 and 5 million km2 for the RCP4.5 climate and between 6 and 16 million km 2 for the RCP8.5 climate. For the RCP4.5 projection, cumulative change in soil carbon varied between 66-Pg C (10 15-g carbon) loss to 70-Pg C gain. For the RCP8.5 projection, losses in soil carbon varied between 74 and 652 Pg C (mean loss, 341 Pg C). For the RCP4.5 projection, gains in vegetation carbon were largely responsible for the overall projected net gains in ecosystem carbon by 2299 (8- to 244-Pg C gains). In contrast, for the RCP8.5 projection, gains in vegetation carbon were not great enough to compensate for the losses of carbon projected by four of the five models; changes in ecosystem carbon ranged from a 641-Pg C loss to a 167-Pgmore » C gain (mean, 208-Pg C loss). The models indicate that substantial net losses of ecosystem carbon would not occur until after 2100. In conclusion, this assessment suggests that effective mitigation efforts during the remainder of this century could attenuate the negative consequences of the permafrost carbon–climate feedback.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ; ORCiD logo [14] ; ORCiD logo [15] ;  [16] ;  [17] ;  [18] ;  [19] more »;  [20] ; ORCiD logo [19] ;  [21] « less
  1. Univ. of Alaska Fairbanks, Fairbanks, AK (United States). US Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit
  2. National Center for Atmospheric Research, Boulder, CO (United States). Climate and Global Dynamics Lab.
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Climate and Ecosystem Sciences Division
  4. Univ. of Alaska Fairbanks, Fairbanks, AK (United States). Inst. of Arctic Biology
  5. Met Office Hadley Centre, Exeter (United Kingdom)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division; Auburn Univ., AL (United States). International Center for Climate and Global Change Research
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. St. Francis Xavier Univ., Antigonish, NS (Canada). Dept. of Earth Sciences
  9. Univ. of Alaska, Fairbanks, Fairbanks, AK (United States). Geophysical Inst.
  10. Laboratoire des Sciences du Climat et de l'Environnement, Gif-sur-Yvette (France). Commissariat a l'Energie Atomique–CNRS–Universite de Versailles Saint-Quentin-en-Yvelines; Univ. Grenoble Alpes, Grenoble (France)
  11. Alfred Wegener Inst. for Polar and Marine Research, Potsdam (Germany); Beijing Normal Univ., Beijing (China)
  12. Laboratoire des Sciences du Climat et de l'Environnement, Gif-sur-Yvette (France). Commissariat a l'Energie Atomique–CNRS–Universite de Versailles Saint-Quentin-en-Yvelines
  13. Univ. Grenoble Alpes, Grenoble (France); oIrstea, Hydrology–Hydraulics Research Unit, Villeurbanne Cedex (France)
  14. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division; Univ. of Maine, Orono, ME (United States). School of Forest Resources
  15. Beijing Normal Univ., Beijing (China)
  16. Univ. Grenoble Alpes, Grenoble (France)
  17. Beijing Normal Univ., Beijing (China); Univ. of Lapland, Rovaniemi (Finland). Arctic Centre
  18. Univ. of Alaska Fairbanks, Fairbanks, AK (United States). Geophysical Inst.; Tyumen State Univ., Tyumen (Russia). International Inst. of Cryology and Cryosphy
  19. Northern Arizona Univ., Flagstaff, AZ (United States). Center for Ecosystem Science and Society, and Dept. of Biological Sciences
  20. Univ. of Colorado, Boulder, CO (United States). National Snow and Ice Data Center
  21. Purdue Univ., West Lafayette, IN (United States). Dept. of Earth, Atmospheric, and Planetary Sciences
Publication Date:
Report Number(s):
LA-UR-18-20805
Journal ID: ISSN 0027-8424
Grant/Contract Number:
AC52-06NA25396; 282700
Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 115; Journal Issue: 15; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Science Foundation (NSF); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); Natural Sciences and Engineering Research Council of Canada (NSERC)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Earth Sciences; permafrost carbon feedback
OSTI Identifier:
1431083