期刊
NATURE CLIMATE CHANGE
卷 7, 期 11, 页码 817-+出版社
NATURE PORTFOLIO
DOI: 10.1038/NCLIMATE3421
关键词
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资金
- Office of Science, Office of Biological and Environmental Research of the US Department of Energy (DOE) [DE-11002-0501111231]
- Terrestrial Ecosystem Science Programs (NC FE-Arcticand NGEE-Tropics)
- Office or Science of'the US Department of Energy [DE-AC02-05CF141231]
- National Science Foundation (NSF)
- NSF
- Office of Science (BER) of the US Department of Energy Computing resources
- Swedish Research Council [E0689701, E0641701]
- EU JPI-climate COUP project
- Marie Sklodowska Curie Actions
- US Department of Energy BER, as part of its Climate Change Prediction Program [DE-FC03-97ER62402/A010]
- NSF [AGS-1048996, ARC-1048987]
- US Department of Agriculture NIFA [2015-67003-23485]
- US Department of Energy TES [DE-300014374]
- [INCA 600398]
The projected loss of soil carbon to the atmosphere resulting from climate change is a potentially large but highly uncertain feedback to warming. The magnitude of this feedback is poorly constrained by observations and theory, and is disparately represented in Earth system models (ESMs)(1-3). To assess the climatological temperature sensitivity of soil carbon, we calculate apparent soil carbon turnover times(4) that reflect long-term and broad-scale rates of decomposition. Here, we show that the climatological temperature control on carbon turnover in the top metre of global soils is more sensitive in cold climates than in warm climates and argue that it is critical to capture this emergent ecosystem property in global-scale models. We present a simplified model that explains the observed high cold-climate sensitivity using only the physical scaling of soil freeze-thaw state across climate gradients. Current ESMs fail to capture this pattern, except in anESMthat explicitly resolves vertical gradients in soil climate and carbon turnover. An observed weak tropical temperature sensitivity emerges in a different model that explicitly resolves mineralogical control on decomposition. These results support projections of strong carbon- climate feedbacks from northern soils(5,6) and demonstrate a method for ESMs to capture this emergent behaviour.
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