Distribution and composition of redox-active species and dissolved organic carbon in Arctic lacustrine porewaters ...
The interaction between redox-active species and dissolved organic carbon (DOC) is crucial in driving lacustrine benthic microbial processes. In lacustrine porewaters, many redox-active species exist in their reduced form, while DOC acts as a substrate and an electron acceptor. Understanding the typ...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | unknown |
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Taylor & Francis
2024
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.6084/m9.figshare.26349299.v1 https://tandf.figshare.com/articles/journal_contribution/Distribution_and_composition_of_redox-active_species_and_dissolved_organic_carbon_in_Arctic_lacustrine_porewaters/26349299/1 |
| Summary: | The interaction between redox-active species and dissolved organic carbon (DOC) is crucial in driving lacustrine benthic microbial processes. In lacustrine porewaters, many redox-active species exist in their reduced form, while DOC acts as a substrate and an electron acceptor. Understanding the types and abundance of redox-active species in porewaters along with their complementary DOC substrate is pivotal for gaining insights into benthic processes, particularly in regions susceptible to climate change. We report the in-situ measurement of redox-active species in sediment porewaters, alongside the ex-situ measurement of DOC extracted from cores collected from two Arctic lakes (Toolik and Fog 1). Fe 2+ was abundantly detected below 4 cm of the sediment-water interface in all cores and was inversely related to dissolved O 2 . Additionally, two distinct Fe(III)-complexes were identified. DOC ranged in the order of 10s of mg/L and either remained stable or increased with depth. A comparison between Toolik and ... |
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