A spatial emergent constraint on the sensitivity of soil carbon turnover to global warming.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33139706.
- Also identified by DOI 10.1038/s41467-020-19208-8 and PMC identifier 7608627.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Carbon cycle feedbacks represent large uncertainties in climate change projections, and the response of soil carbon to climate change contributes the greatest uncertainty to this. Future changes in soil carbon depend on changes in litter and root inputs from plants and especially on reductions in the turnover time of soil carbon (τ<sub>s</sub>) with warming. An approximation to the latter term for the top one metre of soil (ΔC<sub>s,τ</sub>) can be diagnosed from projections made with the CMIP6 and CMIP5 Earth System Models (ESMs), and is found to span a large range even at 2 °C of global warming (-196 ± 117 PgC). Here, we present a constraint on ΔC<sub>s,τ</sub>, which makes use of current heterotrophic respiration and the spatial variability of τ<sub>s</sub> inferred from observations. This spatial emergent constraint allows us to halve the uncertainty in ΔC<sub>s,τ</sub> at 2 °C to -232 ± 52 PgC.