{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Stolze L"],"funding":["U.S. Department of Energy, Biological and Environmental Research"],"pagination":["e2400230121"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC11228488"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["121(27)"],"pubmed_abstract":["Climate influences near-surface biogeochemical processes and thereby determines the partitioning of carbon dioxide (CO<sub>2</sub>) in shale, and yet the controls on carbon (C) weathering fluxes remain poorly constrained. Using a dataset that characterizes biogeochemical responses to climate forcing in shale regolith, we implement a numerical model that describes the effects of water infiltration events, gas exchange, and temperature fluctuations on soil respiration and mineral weathering at a seasonal timescale. Our modeling approach allows us to quantitatively disentangle the controls of transient climate forcing and biogeochemical mechanisms on C partitioning. We find that ~3% of soil CO<sub>2</sub> (1.02 mol C/m<sup>2</sup>/y) is exported to the subsurface during large infiltration events. Here, net atmospheric CO<sub>2</sub> drawdown primarily occurs during spring snowmelt, governs the aqueous C exports (61%), and exceeds the CO<sub>2</sub> flux generated by pyrite and petrogenic organic matter oxidation (~0.2 mol C/m<sup>2</sup>/y). We show that shale CO<sub>2</sub> consumption results from the temporal coupling between soil microbial respiration and carbonate weathering. This coupling is driven by the impacts of hydrologic fluctuations on fresh organic matter availability and CO<sub>2</sub> transport to the weathering front. Diffusion-limited transport of gases under transient hydrological conditions exerts an important control on CO<sub>2(g)</sub> egress patterns and thus must be considered when inferring soil CO<sub>2</sub> drawdown from the gas phase composition. Our findings emphasize the importance of seasonal climate forcing in shaping the net contribution of shale weathering to terrestrial C fluxes and suggest that warmer conditions could reduce the potential for shale weathering to act as a CO<sub>2</sub> sink."],"journal":["Proceedings of the National Academy of Sciences of the United States of America"],"pubmed_title":["Climate forcing controls on carbon terrestrial fluxes during shale weathering."],"pmcid":["PMC11228488"],"funding_grant_id":["DE-AC02-05CH11231"],"pubmed_authors":["Arora B","Steefel CI","Nico P","Stolze L","Bandai T","Wu Y","Dwivedi D"],"additional_accession":[]},"is_claimable":false,"name":"Climate forcing controls on carbon terrestrial fluxes during shale weathering.","description":"Climate influences near-surface biogeochemical processes and thereby determines the partitioning of carbon dioxide (CO<sub>2</sub>) in shale, and yet the controls on carbon (C) weathering fluxes remain poorly constrained. Using a dataset that characterizes biogeochemical responses to climate forcing in shale regolith, we implement a numerical model that describes the effects of water infiltration events, gas exchange, and temperature fluctuations on soil respiration and mineral weathering at a seasonal timescale. Our modeling approach allows us to quantitatively disentangle the controls of transient climate forcing and biogeochemical mechanisms on C partitioning. We find that ~3% of soil CO<sub>2</sub> (1.02 mol C/m<sup>2</sup>/y) is exported to the subsurface during large infiltration events. Here, net atmospheric CO<sub>2</sub> drawdown primarily occurs during spring snowmelt, governs the aqueous C exports (61%), and exceeds the CO<sub>2</sub> flux generated by pyrite and petrogenic organic matter oxidation (~0.2 mol C/m<sup>2</sup>/y). We show that shale CO<sub>2</sub> consumption results from the temporal coupling between soil microbial respiration and carbonate weathering. This coupling is driven by the impacts of hydrologic fluctuations on fresh organic matter availability and CO<sub>2</sub> transport to the weathering front. Diffusion-limited transport of gases under transient hydrological conditions exerts an important control on CO<sub>2(g)</sub> egress patterns and thus must be considered when inferring soil CO<sub>2</sub> drawdown from the gas phase composition. Our findings emphasize the importance of seasonal climate forcing in shaping the net contribution of shale weathering to terrestrial C fluxes and suggest that warmer conditions could reduce the potential for shale weathering to act as a CO<sub>2</sub> sink.","dates":{"release":"2024-01-01T00:00:00Z","publication":"2024 Jul","modification":"2025-04-26T05:39:33.067Z","creation":"2025-04-06T11:35:55.164Z"},"accession":"S-EPMC11228488","cross_references":{"pubmed":["38913902"],"doi":["10.1073/pnas.2400230121"]}}