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dc.contributor.authorFry, Brian
dc.contributor.authorJustic, Dubravko
dc.contributor.authorRiekenberg, Philip
dc.contributor.authorSwenson, Erick M
dc.contributor.authorTurner, R Eugene
dc.contributor.authorWang, Lixia
dc.contributor.authorPride, Lora
dc.contributor.authorRabalais, Nancy N
dc.contributor.authorKurtz, Janis C
dc.contributor.authorLehrter, John C
dc.contributor.authorMurrell, Michael C
dc.contributor.authorShadwick, Elizabeth H
dc.contributor.authorBoyd, Brandon
dc.date.accessioned2018-07-16T05:55:46Z
dc.date.available2018-07-16T05:55:46Z
dc.date.issued2015
dc.identifier.issn1559-2723
dc.identifier.doi10.1007/s12237-014-9863-9
dc.identifier.urihttp://hdl.handle.net/10072/100989
dc.description.abstractLarge-scale hypoxia regularly develops during the summer on the Louisiana continental shelf. Traditionally, hypoxia has been linked to the vast winter and spring nutrient inputs from the Mississippi River and its distributary, the Atchafalaya River. However, recent studies indicate that much of the shelf ecosystem is heterotrophic. We used data from five late July shelfwide cruises from 2006 to 2010 to examine carbon and oxygen production and identify net autotrophic areas of phytoplankton growth on the Louisiana shelf. During these summer times of moderate river flows, shelfwide pH and particulate organic carbon (POC) consistently showed strong signals for net autotrophy in low salinity (<25) waters near the river mouths. There was substantial POC removal via grazing and sedimentation in near-river regions, with 66–85 % of POC lost from surface waters in the low and mid-salinity ranges without producing strong respiration signals in surface waters. This POC removal in nearshore environments indicates highly efficient algal retention by the shelf ecosystem. Updated carbon export calculations for local estuaries and a preliminary shelfwide carbon budget agree with older concepts that offshore hypoxia is linked strongly to nutrient loading from the Mississippi River, but a new emphasis on cross-shelf dynamics emerged in this research. Cross-shelf transects indicated that river-influenced nearshore waters <15 m deep are strong sources of net carbon production, with currents and wave-induced resuspension likely transporting this POC offshore to fuel hypoxia in adjacent mid-shelf bottom waters.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofpagefrom703
dc.relation.ispartofpageto721
dc.relation.ispartofissue3
dc.relation.ispartofjournalEstuaries and Coasts
dc.relation.ispartofvolume38
dc.subject.fieldofresearchEarth sciences
dc.subject.fieldofresearchOther earth sciences not elsewhere classified
dc.subject.fieldofresearchEnvironmental sciences
dc.subject.fieldofresearchBiological sciences
dc.subject.fieldofresearchcode37
dc.subject.fieldofresearchcode379999
dc.subject.fieldofresearchcode41
dc.subject.fieldofresearchcode31
dc.titleCarbon Dynamics on the Louisiana Continental Shelf and Cross-Shelf Feeding of Hypoxia
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Environment
gro.hasfulltextNo Full Text
gro.griffith.authorFry, Brian D.


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