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dc.contributor.authorLong, Matthew H.  Concept link
dc.contributor.authorBerg, Peter  Concept link
dc.contributor.authorFalter, James L.  Concept link
dc.date.accessioned2015-07-31T16:31:26Z
dc.date.available2015-11-22T09:41:49Z
dc.date.issued2015-05-22
dc.identifier.citationJournal of Geophysical Research: Oceans 120 (2015): 3624–3639en_US
dc.identifier.urihttps://hdl.handle.net/1912/7434
dc.descriptionAuthor Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 120 (2015): 3624–3639, doi:10.1002/2014JC010352.en_US
dc.description.abstractThe net ecosystem metabolism of the seagrass Thalassia testudinum was studied across a nutrient and productivity gradient in Florida Bay, Florida, using the Eulerian control volume, eddy covariance, and biomass addition techniques. In situ oxygen fluxes were determined by a triangular Eulerian control volume with sides 250 m long and by eddy covariance instrumentation at its center. The biomass addition technique evaluated the aboveground seagrass productivity through the net biomass added. The spatial and temporal resolutions, accuracies, and applicability of each method were compared. The eddy covariance technique better resolved the short-term flux rates and the productivity gradient across the bay, which was consistent with the long-term measurements from the biomass addition technique. The net primary production rates from the biomass addition technique, which were expected to show greater autotrophy due to the exclusion of sediment metabolism and belowground production, were 71, 53, and 30 mmol carbon m−2 d−1 at 3 sites across the bay. The net ecosystem metabolism was 35, 25, and 11 mmol oxygen m−2 d−1 from the eddy covariance technique and 10, −103, and 14 mmol oxygen m−2 d−1 from the Eulerian control volume across the same sites, respectively. The low-flow conditions in the shallow bays allowed for periodic stratification and long residence times within the Eulerian control volume that likely reduced its precision. Overall, the eddy covariance technique had the highest temporal resolution while producing accurate long-term flux rates that surpassed the capabilities of the biomass addition and Eulerian control volume techniques in these shallow coastal bays.en_US
dc.description.sponsorshipThis research was conducted under Everglades National Park permit # EVER-2011-SCI-0057. This study received financial support from the Jones Environmental and Barley Scholars Program at the University of Virginia and the National Science Foundation (Chemical Oceanography grant OCE-0536431).en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2014JC010352
dc.subjectEddy covarianceen_US
dc.subjectEulerianen_US
dc.subjectMetabolismen_US
dc.subjectSeagrassen_US
dc.subjectEddy correlationen_US
dc.titleSeagrass metabolism across a productivity gradient using the eddy covariance, Eulerian control volume, and biomass addition techniquesen_US
dc.typeArticleen_US
dc.description.embargo2015-11-22en_US
dc.identifier.doi10.1002/2014JC010352


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