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Title: Higher climatological temperature sensitivity of soil carbon in cold than warm climates

Journal Article · · Nature Climate Change
DOI:https://doi.org/10.1038/NCLIMATE3421· OSTI ID:1489154
ORCiD logo [1];  [2];  [3]; ORCiD logo [4]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Sciences Div.
  2. Stockholm Univ. (Sweden). Dept. of Physical Geography & Bolin Centre of Climate Research; Stanford Univ., CA (United States). School of Earth, Energy, and Environmental Sciences
  3. National Center for Atmospheric Research, Boulder, CO (United States). Climate & Global Dynamics Lab.
  4. National Center for Atmospheric Research, Boulder, CO (United States). Climate & Global Dynamics Lab.; Univ. of Colorado, Boulder, CO (United States). Inst. of Arctic & Alpine Research

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). To assess the climatological temperature sensitivity of soil carbon, we calculate apparent soil carbon turnover times 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 an ESM that 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 and demonstrate a method for ESMs to capture this emergent behaviour.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
DOE Contract Number:
AC02-05CH11231; FC03-97ER62402; SC0014374
OSTI ID:
1489154
Journal Information:
Nature Climate Change, Vol. 7, Issue 11; ISSN 1758-678X
Country of Publication:
United States
Language:
English

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New Techniques and Data for Understanding the Global Soil Respiration Flux journal September 2018
The Response of Permafrost and High‐Latitude Ecosystems Under Large‐Scale Stratospheric Aerosol Injection and Its Termination journal June 2019
Soil Organic Matter Temperature Sensitivity Cannot be Directly Inferred From Spatial Gradients journal June 2019
Greenhouse Gas Production and Transport in Desert Soils of the Southwestern United States journal November 2018
Leveraging Environmental Research and Observation Networks to Advance Soil Carbon Science journal May 2019
Greenhouse Gas Concentration and Volcanic Eruptions Controlled the Variability of Terrestrial Carbon Uptake Over the Last Millennium journal June 2019
The Community Land Model Version 5: Description of New Features, Benchmarking, and Impact of Forcing Uncertainty journal December 2019
Precipitation thresholds regulate net carbon exchange at the continental scale journal September 2018
Controls of soil organic matter on soil thermal dynamics in the northern high latitudes journal July 2019
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Zones of influence for soil organic matter dynamics: A conceptual framework for data and models journal August 2019
Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland journal October 2019
Biogeographic variation in temperature sensitivity of decomposition in forest soils journal October 2019
A substantial role of soil erosion in the land carbon sink and its future changes journal February 2020
Detailed global modelling of soil organic carbon in cropland, grassland and forest soils journal September 2019
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Temperature and moisture are minor drivers of regional-scale soil organic carbon dynamics text January 2019
The Response of Permafrost and High‐Latitude Ecosystems under Large‐Scale Stratospheric Aerosol Injection and its Termination text January 2019
Scientists’ warning to humanity: microorganisms and climate change text January 2019
A proxy-year analysis shows reduced soil temperatures with climate warming in boreal forest journal November 2018

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