Eddy Covariance Data Reveal That a Small Freshwater Reservoir Emits a Substantial Amount of Carbon Dioxide and Methane

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dc.contributor.authorHounshell, Alexandria G.en
dc.contributor.authorD'Acunha, Brenda M.en
dc.contributor.authorBreef-Pilz, Adrienneen
dc.contributor.authorJohnson, Mark S.en
dc.contributor.authorThomas, R. Quinnen
dc.contributor.authorCarey, Cayelan C.en
dc.date.accessioned2024-01-17T14:28:47Zen
dc.date.available2024-01-17T14:28:47Zen
dc.date.issued2023-03-14en
dc.description.abstractSmall freshwater reservoirs are ubiquitous and likely play an important role in global greenhouse gas (GHG) budgets relative to their limited water surface area. However, constraining annual GHG fluxes in small freshwater reservoirs is challenging given their footprint area and spatially and temporally variable emissions. To quantify the GHG budget of a small (0.1 km2) reservoir, we deployed an Eddy covariance (EC) system in a small reservoir located in southwestern Virginia, USA over 2 years to measure carbon dioxide (CO2) and methane (CH4) fluxes near-continuously. Fluxes were coupled with in situ sensors measuring multiple environmental parameters. Over both years, we found the reservoir to be a large source of CO2 (633–731 g CO2-C m−2 yr−1) and CH4 (1.02–1.29 g CH4-C m−2 yr−1) to the atmosphere, with substantial sub-daily, daily, weekly, and seasonal timescales of variability. For example, fluxes were substantially greater during the summer thermally stratified season as compared to the winter. In addition, we observed significantly greater GHG fluxes during winter intermittent ice-on conditions as compared to continuous ice-on conditions, suggesting GHG emissions from lakes and reservoirs may increase with predicted decreases in winter ice-cover. Finally, we identified several key environmental variables that may be driving reservoir GHG fluxes at multiple timescales, including, surface water temperature and thermocline depth followed by fluorescent dissolved organic matter. Overall, our novel year-round EC data from a small reservoir indicate that these freshwater ecosystems likely contribute a substantial amount of CO2 and CH4 to global GHG budgets, relative to their surface area.en
dc.description.versionPublished versionen
dc.format.extent22 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN e2022JG007091 (Article number)en
dc.identifier.doihttps://doi.org/10.1029/2022JG007091en
dc.identifier.eissn2169-8961en
dc.identifier.issn2169-8953en
dc.identifier.issue3en
dc.identifier.orcidThomas, Robert [0000-0003-1282-7825]en
dc.identifier.orcidCarey, Cayelan [0000-0001-8835-4476]en
dc.identifier.urihttps://hdl.handle.net/10919/117377en
dc.identifier.volume128en
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectgreenhouse gasesen
dc.subjectfluxesen
dc.subjectcarbon dioxideen
dc.subjectmethaneen
dc.subjectFalling Creek Reservoiren
dc.subjecttemporal scalesen
dc.titleEddy Covariance Data Reveal That a Small Freshwater Reservoir Emits a Substantial Amount of Carbon Dioxide and Methaneen
dc.title.serialJournal of Geophysical Research Research-Biogeosciencesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/Science/Biological Sciencesen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen

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