Processes controlling carbon cycling in Antarctic glacier surface ecosystems

Bagshaw, E. A. ORCID: https://orcid.org/0000-0001-8392-1750, Tranter, M., Wadham, J. L., Fountain, A. G., Dubnick, A. and Fitzsimons, S. 2016. Processes controlling carbon cycling in Antarctic glacier surface ecosystems. Geochemical Perspectives Letters 2 (1) , pp. 44-54. 10.7185/geochemlet.1605

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Abstract

Glacier surface ecosystems, including cryoconite holes and cryolakes, are significant contributors to regional carbon cycles. Incubation experiments to determine the net production (NEP) of organic matter in cryoconite typically have durations of 6-24 hours, and produce a wide range of results, many of which indicate that the system is net heterotrophic. We employ longer term incubations to examine the temporal variation of NEP in cryoconite from the McMurdo Dry Valleys, Antarctica to examine the effect of sediment disturbance on system production, and to understand processes controlling production over the lifetimes of glacier surface ecosystems. The shorter-term incubations have durations of one week and show net heterotrophy. The longer term incubations of approximately one year show net autotrophy, but only after a period of about 40 days (~1000 hours). The control on net organic carbon production is a combination of the rate of diffusion of dissolved inorganic carbon from heterotrophic activity within cryoconite into the water, the rate of carbonate dissolution, and the saturation of carbonate in the water (which is a result of photosynthesis in a closed system). We demonstrate that sediment on glacier surfaces has the potential to accumulate carbon over timescales of months to years.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	Q Science > QE Geology
Additional Information:	Creative Commons Attribution 4.0 License
ISSN:	2410-339X
Date of First Compliant Deposit:	30 March 2016
Date of Acceptance:	7 December 2015
Last Modified:	04 May 2023 19:58
URI:	https://orca.cardiff.ac.uk/id/eprint/86188

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