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Tidal controls on trace gas dynamics in a seagrass meadow of the Ria Formosa lagoon (southern Portugal)

2015Journal article Open access
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dc.contributor.authorBahlmann, E.
dc.contributor.authorWeinberg, I.
dc.contributor.authorLavric, J. V.
dc.contributor.authorEckhardt, T.
dc.contributor.authorMichaelis, W.
dc.contributor.authorSantos, Rui
dc.contributor.authorSeifert, R.
dc.date.accessioned2018-12-07T14:58:27Z
dc.date.available2018-12-07T14:58:27Z
dc.date.issued2015
dc.description.abstractCoastal zones are important source regions for a variety of trace gases, including halocarbons and sulfur-bearing species. While salt marshes, macroalgae and phyto-plankton communities have been intensively studied, little is known about trace gas fluxes in seagrass meadows. Here we report results of a newly developed dynamic flux chamber system that can be deployed in intertidal areas over full tidal cycles allowing for highly time-resolved measurements. The fluxes of CO2, methane (CH4) and a range of volatile organic compounds (VOCs) showed a complex dynamic mediated by tide and light. In contrast to most previous studies, our data indicate significantly enhanced fluxes during tidal immersion relative to periods of air exposure. Short emission peaks occurred with onset of the feeder current at the sampling site. We suggest an overall strong effect of advective transport processes to explain the elevated fluxes during tidal immersion. Many emission estimates from tidally influenced coastal areas still rely on measurements carried out during low tide only. Hence, our results may have significant implications for budgeting trace gases in coastal areas. This dynamic flux chamber system provides intensive time series data of community respiration (at night) and net community production (during the day) of shallow coastal systems.
dc.description.sponsorshipGerman Federal Ministry of Education and Research (BMBF) [03F0611E, 03F0662E]; EU FP7 ASSEMBLE research infrastructure initiative;
dc.identifier.doi10.5194/bg-12-1683-2015
dc.identifier.issn1726-4170
dc.identifier.issn1726-4189
dc.identifier.urihttp://hdl.handle.net/10400.1/12027
dc.language.isoeng
dc.peerreviewedyes
dc.publisherCopernicus Gesellschaft Mbh
dc.subjectIntertidal sand flat
dc.subjectPore-water exchange
dc.subjectHalogenated organic-compounds
dc.subjectBiogenic sulfur-compounds
dc.subjectEastern english-channel
dc.subjectCoastal salt marshes
dc.subjectMethane production
dc.subjectMarine-sediments
dc.subjectZostera-noltii
dc.subjectMethyl-bromide
dc.titleTidal controls on trace gas dynamics in a seagrass meadow of the Ria Formosa lagoon (southern Portugal)
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FAAC-CLI%2F103348%2F2008/PT
oaire.citation.endPage1696
oaire.citation.issue6
oaire.citation.startPage1683
oaire.citation.titleBiogeosciences
oaire.citation.volume12
oaire.fundingStream3599-PPCDT
person.familyNameSantos
person.givenNameRui
person.identifier42560
person.identifier.ciencia-id9B18-444D-2244
person.identifier.orcid0000-0002-7861-4366
person.identifier.ridB-4168-2008
person.identifier.scopus-author-id7201375018
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscovery84487ca8-404a-4584-81f0-3662c340d712
relation.isProjectOfPublicationaa2aaed7-789c-43dd-9a93-f46a81dd9675
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