The Cryosphere
The Cryosphere
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Articles | Volume 19, issue 8
Articles | Volume 19, issue 8
https://doi.org/10.5194/tc-19-2769-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-19-2769-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 8
Brief communication
 | 
04 Aug 2025
Brief communication |  | 04 Aug 2025

Brief communication: Stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon pool

Amy D. Holt, Jason B. Fellman, Anne M. Kellerman, Eran Hood, Samantha H. Bosman, Amy M. McKenna, Jeffery P. Chanton, and Robert G. M. Spencer

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Short summary
Glacier runoff is a source of old bioavailable dissolved organic carbon (DOC) to downstream ecosystems. The DOC pool is composed of material of various origins, chemical compositions, ages, and levels of bioavailability. Using bioincubation experiments, we show that glacier DOC respiration is driven by a young source, rather than by ancient material which comprises the majority of the glacier carbon pool. This young bioavailable fraction could currently be a critical carbon subsidy for recipient food webs. 
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