Carbon cycling in sub-Antarctic and Antarctic lakes

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dc.contributor.authorMcDonough, LKen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorSaunders, KMen_AU
dc.contributor.authorBaker, AAen_AU
dc.date.accessioned2023-02-01T23:41:30Zen_AU
dc.date.available2023-02-01T23:41:30Zen_AU
dc.date.issued2021-12-17en_AU
dc.date.statistics2022-11-16en_AU
dc.description.abstractBetween 2000 and 2010, anthropogenic carbon emissions rose at rates of 2.2% year-1, a 70% increase above the annual rates observed between 1970 and 2000. This has accelerated global temperature increases. As a result, carbon fluxes to and from aquatic environments have changed, affecting microbial community compositions, and impacting the ability of some environments to act as carbon stores. Whilst the factors influencing nutrient cycling in many aquatic environments, including major rivers and oceans, have been well studied, little is known about the biogeochemical processes driving aquatic carbon cycling in sub-Antarctic and Antarctic lakes, and how this may be impacted by climate change. This is in part because sampling programs designed for such isolated environments take years to plan and require international collaboration. The isolation of these lakes however mean that many are relatively undisturbed by human activities, making them ideal locations to study the interactions between hydrological and biogeochemical processes, and the impact of climate change on natural carbon sources, transformation and storage. We aim to analyse Antarctic and sub-Antarctic lake water using organic carbon characterisation techniques such as fluorescence, liquid chromatography organic carbon detection and synchrotron characterisation, as well as radiocarbon and stable carbon isotopes of dissolved organic carbon (14CDOC and 13CDOC) and dissolved inorganic carbon (14CDIC and 13CDIC). This will allow us to identify key carbon sources such as terrestrial vegetation, groundwater and permafrost thaw, carbon age, and cycling via biodegradation or other processing mechanisms. The data collected for this project will form the first comprehensive spatial and temporal survey of dissolved carbon in both organic and inorganic phases in lakes across the region, aimed at understanding present-day environmental processes and their drivers. These data also have the potential to calibrate palaeo-records such as peat and lake archives which will assist in the understanding of the impacts of large-scale climate variability and environmental changes that may occur in the future.en_AU
dc.identifier.articlenumberB45J-1756en_AU
dc.identifier.booktitleAGU Fall Meeting Abstractsen_AU
dc.identifier.citationMcDonough, L., Meredith, K., Saunders, K., & Baker, A. (2021). Carbon cycling in sub-Antarctic and Antarctic lakes. Poster presented at the AGU Fall Meeting 2021, New Orleans, Los Angeles and Online, 13-17 December 2021. In AGU Fall Meeting Abstracts, Vol. 2021, B45J-1756. Retrieved from: https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/879073en_AU
dc.identifier.conferenceenddate17 December 2021en_AU
dc.identifier.conferencenameAGU Fall Meeting 2021en_AU
dc.identifier.conferenceplaceNew Orleans, Louisiana and Onlineen_AU
dc.identifier.conferencestartdate13 December 2021en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/879073en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14594en_AU
dc.identifier.volume2021en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.subjectCarbon cycleen_AU
dc.subjectLakesen_AU
dc.subjectAntarctic regionsen_AU
dc.subjectClimatic changeen_AU
dc.subjectCarbon 14en_AU
dc.subjectGround wateren_AU
dc.subjectPaleoclimatologyen_AU
dc.titleCarbon cycling in sub-Antarctic and Antarctic lakesen_AU
dc.typeConference Posteren_AU
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