Show simple item record

dc.contributor.authorFry, Brian
dc.date.accessioned2019-05-29T13:05:46Z
dc.date.available2019-05-29T13:05:46Z
dc.date.issued2018
dc.identifier.issn1559-2731
dc.identifier.doi10.1007/s12237-018-0365-z
dc.identifier.urihttp://hdl.handle.net/10072/380081
dc.description.abstractBottom waters of the Louisiana mid-continental shelf regularly become hypoxic with < 64 mmol m−3 (< 2 mg/l) dissolved oxygen (DO) during spring and summer months. This hypoxia is ultimately due to freshwater and nutrient inputs from the Mississippi River system. Two local controls of hypoxia were investigated, rates of respiration (R) in bottom waters versus the metabolic age of bottom water oxygen pools, estimated as time since oxygen saturation (TSOS). Fast R could lead to hypoxia even in recently formed bottom waters, while conversely, extended periods of bottom water isolation and TSOS could lead to hypoxia formation even when R is slow. Shipboard 24 h dark R measurements that were carried out during July shelfwide cruises in 2007 and 2008 indicated relatively slow R and long TSOS for hypoxic waters. To check these shipboard incubation results, oxygen isotopes were measured and modelled as field indicators of past R (RP), a time-averaged measure of in situ R that occurred prior to sampling during the days-to-weeks of oxygen drawdown in bottom waters. The isotope measurements showed that shipboard incubation R (RI) experiments underestimated RP that was 18–34% higher for hypoxic bottom waters than normoxic (DO > 64 mmol m−3) bottom waters. The field isotope measurements also showed that RP was above average and more important when and where river influences were larger, especially in the flood year 2008 and on the eastern shelf. In contrast, bottom water metabolic ages estimated as TSOS were above average and more important for hypoxia formation when and where river influences were smaller, especially in the average-flow year 2007 and on the western shelf.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherSpringer
dc.publisher.placeUnited States
dc.relation.ispartofpagefrom1297
dc.relation.ispartofpageto1313
dc.relation.ispartofissue5
dc.relation.ispartofjournalEstuaries and Coasts
dc.relation.ispartofvolume41
dc.subject.fieldofresearchEnvironmental Sciences not elsewhere classified
dc.subject.fieldofresearchEarth Sciences
dc.subject.fieldofresearchEnvironmental Sciences
dc.subject.fieldofresearchBiological Sciences
dc.subject.fieldofresearchcode059999
dc.subject.fieldofresearchcode04
dc.subject.fieldofresearchcode05
dc.subject.fieldofresearchcode06
dc.titleRespiration and Metabolic Age as Controls of Bottom Water Hypoxia on the Louisiana Continental Shelf; 18&#916; as the Ghost of Respiration Past
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, School of Environment and Science
gro.hasfulltextNo Full Text
gro.griffith.authorFry, Brian D.


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

  • Journal articles
    Contains articles published by Griffith authors in scholarly journals.

Show simple item record