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    Interactions between land use change and carbon cycle feedbacks

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    Date
    2017-01-23
    Author
    Mahowald, Natalie M.  Concept link
    Randerson, James T.  Concept link
    Lindsay, Keith  Concept link
    Munoz, Ernesto  Concept link
    Doney, Scott C.  Concept link
    Lawrence, Peter  Concept link
    Schlunegger, Sarah  Concept link
    Ward, Daniel S.  Concept link
    Lawrence, David  Concept link
    Hoffman, Forrest M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8868
    As published
    https://doi.org/10.1002/2016GB005374
    DOI
    10.1002/2016GB005374
    Keyword
     Carbon cycle; Climate change; Land use and land cover change; Earth system models 
    Abstract
    Using the Community Earth System Model, we explore the role of human land use and land cover change (LULCC) in modifying the terrestrial carbon budget in simulations forced by Representative Concentration Pathway 8.5, extended to year 2300. Overall, conversion of land (e.g., from forest to croplands via deforestation) results in a model-estimated, cumulative carbon loss of 490 Pg C between 1850 and 2300, larger than the 230 Pg C loss of carbon caused by climate change over this same interval. The LULCC carbon loss is a combination of a direct loss at the time of conversion and an indirect loss from the reduction of potential terrestrial carbon sinks. Approximately 40% of the carbon loss associated with LULCC in the simulations arises from direct human modification of the land surface; the remaining 60% is an indirect consequence of the loss of potential natural carbon sinks. Because of the multicentury carbon cycle legacy of current land use decisions, a globally averaged amplification factor of 2.6 must be applied to 2015 land use carbon losses to adjust for indirect effects. This estimate is 30% higher when considering the carbon cycle evolution after 2100. Most of the terrestrial uptake of anthropogenic carbon in the model occurs from the influence of rising atmospheric CO2 on photosynthesis in trees, and thus, model-projected carbon feedbacks are especially sensitive to deforestation.
    Description
    Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 31 (2017): 96–113, doi:10.1002/2016GB005374.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Global Biogeochemical Cycles 31 (2017): 96–113
     

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