@article{fb6d5cc790414f20883ca4b8ab5c44f7,
title = "Seasonal Changes in Hydrology and Permafrost Degradation Control Mineral Element-Bound DOC Transport From Permafrost Soils to Streams",
abstract = "Mineral elements bind to dissolved organic carbon (DOC) in permafrost soils, and this may contribute to the stabilization or the degradation of organic carbon along the soil to river continuum. Permafrost thaw enlarges the pool of soil constituents available for soil to river transfer. The unknown is how changes in hydrology upon permafrost degradation affect the connection between soil-derived mineral element-bound DOC and headwater streams. Here, we study Al, Fe, Ca, and DOC concentrations in water from a headwater stream at Eight Mile Lake, Alaska, USA (colloidal [0.22 μm–1 kDa] and truly dissolved [<1 kDa] fractions) and in soil pore waters sampled across a gradient of permafrost degradation at the same location. We target the peak flow to base flow transition to show that there is a narrow window of mineral element-bound DOC colloid transport from soils to streams. We show that during spring thaw and maximum thaw there is an enhanced lateral transfer of mineral element-bound DOC colloids in extensively degraded sites compared to minimally degraded sites. This is explained by a more rapid response of hydrology at peak flow to base flow transition at degraded sites. Our results suggest that ongoing permafrost degradation and the associated response of soils to changing hydrology can be detected by targeting the composition and size of mineral element-DOC associations in soil waters and headwater streams during peak flow-baseflow transitions.",
keywords = "colloids, degradation, hydrology, permafrost, river, soil",
author = "Catherine Hirst and Elisabeth Mauclet and Arthur Monhonval and Emeline Tihon and Justin Ledman and Schuur, {Edward A.G.} and Sophie Opfergelt",
note = "Funding Information: The authors would like to thank Anne Iserentant, Claudine Givron, Elodie Devos, and H{\'e}l{\`e}ne Dailly from the analytical platform MOCA at UCLouvain. Meghan Taylor is thanked for her valuable contribution to field logistics and sampling, and Simon Malvaux is thanked for his contribution to field sampling in 2019. Magnus M{\"o}rth is thanked for the oxygen and deuterium isotope analysis at Stockholm University. The authors acknowledge funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Starting Grant, WeThaw, grant agreement no: 714617) to S. Opfergelt, and S. Opfergelt acknowledges funding from the Fonds National de la Recherche Scientifique (FNRS, Belgium, FC69480). Data sets for this research are available in Opfergelt et al. ( 2021a , 2021b , 2021c ). The Bonanza Creek LTER website is acknowledged for the EML data access, with support from the National Science Foundation Long Term Research in Environmental Biology (LTREB Award number: 1754839), the Department of Energy NICCR Program; Department of Energy Terrestrial Ecosystem Processes; the National Science Foundation CAREER Program; the National Parks Inventory and Monitoring Program; the National Science Foundation Bonanza Creek LTER program; the National Science Foundation Office of Polar Programs and the Arctic Natural Sciences Program. Funding Information: The authors would like to thank Anne Iserentant, Claudine Givron, Elodie Devos, and H{\'e}l{\`e}ne Dailly from the analytical platform MOCA at UCLouvain. Meghan Taylor is thanked for her valuable contribution to field logistics and sampling, and Simon Malvaux is thanked for his contribution to field sampling in 2019. Magnus M{\"o}rth is thanked for the oxygen and deuterium isotope analysis at Stockholm University. The authors acknowledge funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Starting Grant, WeThaw, grant agreement no: 714617) to S. Opfergelt, and S. Opfergelt acknowledges funding from the Fonds National de la Recherche Scientifique (FNRS, Belgium, FC69480). Data sets for this research are available in Opfergelt et al. (2021a, 2021b, 2021c). The Bonanza Creek LTER website is acknowledged for the EML data access, with support from the National Science Foundation Long Term Research in Environmental Biology (LTREB Award number: 1754839), the Department of Energy NICCR Program; Department of Energy Terrestrial Ecosystem Processes; the National Science Foundation CAREER Program; the National Parks Inventory and Monitoring Program; the National Science Foundation Bonanza Creek LTER program; the National Science Foundation Office of Polar Programs and the Arctic Natural Sciences Program. Publisher Copyright: {\textcopyright} 2022. American Geophysical Union. All Rights Reserved.",
year = "2022",
month = feb,
doi = "10.1029/2021GB007105",
language = "English (US)",
volume = "36",
journal = "Global Biogeochemical Cycles",
issn = "0886-6236",
publisher = "American Geophysical Union",
number = "2",
}