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  • Supplemental data for 'Soil moisture drought as a major driver of carbon cycle uncertainty", Geophysical Research Letters

    Description:
    Future projections suggest an increase in drought globally with climate change. Current vegetation models typically regulate the plant photosynthetic response to soil moisture stress through an empirical function, rather than a mechanistic response where plant water potentials respond to changes in soil water. This representation of soil moisture stress may introduce significant uncertainty into projections for the terrestrial carbon cycle. We examined the use of the soil moisture limitation function in historical and future emissions scenarios in nine Earth system models. We found that soil moisture-limited productivity across models represented a large and uncertain component of the simulated carbon cycle, comparable to 3-286% of current global productivity. Approximately 40-80% of the intermodel variability was due to the functional form of the limitation equation alone. Our results highlight the importance of implementing mechanistic water limitation schemes in models and illuminate several avenues for improving projections of the land carbon sink.
    Creator:
    Medvigy, David, Trugman, Anna T., Mankin, Justin S., and Anderegg, William R.L.
    Owner:
    BRIAN MCBRIDE
    Language:
    English
    Date Uploaded:
    07/11/2019
    Date Modified:
    12/09/2021
    Date Created:
    Spring 2016
    Resource Type:
    Dataset
    Identifier:
    https://doi.org/10.7278/S5707ZMS