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Source of trace element variability in Great Barrier Reef corals affected by the Burdekin flood plumes

Alibert, C; Kinsley, Leslie; Fallon, Stewart; McCulloch, Malcolm; Berkelmans, Ray; McAllister, Felicity

Description

Massive corals in the Great Barrier Reef, analyzed at high-resolution for Sr/Ca (thermal ionization mass spectrometry) and trace elements such as Ba and Mn (laser ablation inductively coupled plasma mass spectrometry), can provide continuous proxy records of dissolved seawater concentrations, as well as sea surface temperature (SST). A 10-yr record (1989 to 1998) from Pandora Reef, an inshore reef regularly impacted by the freshwater plumes of the Burdekin River, is compared with an overlapping...[Show more]

dc.contributor.authorAlibert, C
dc.contributor.authorKinsley, Leslie
dc.contributor.authorFallon, Stewart
dc.contributor.authorMcCulloch, Malcolm
dc.contributor.authorBerkelmans, Ray
dc.contributor.authorMcAllister, Felicity
dc.date.accessioned2015-12-13T22:34:56Z
dc.date.available2015-12-13T22:34:56Z
dc.identifier.issn1872-9533
dc.identifier.urihttp://hdl.handle.net/1885/76351
dc.description.abstractMassive corals in the Great Barrier Reef, analyzed at high-resolution for Sr/Ca (thermal ionization mass spectrometry) and trace elements such as Ba and Mn (laser ablation inductively coupled plasma mass spectrometry), can provide continuous proxy records of dissolved seawater concentrations, as well as sea surface temperature (SST). A 10-yr record (1989 to 1998) from Pandora Reef, an inshore reef regularly impacted by the freshwater plumes of the Burdekin River, is compared with an overlapping record from a midshelf reef, away from runoff influences. Surface seawater samples, taken away from river plumes, show little variability for Sr/Ca (8484 ± 10 μmol/mol) and Ba (33.7 ± 0.7 nmol/kg). Discrete Ba/Ca peaks in the inshore coral coincide with flood events. The magnitude of this Ba/Ca enrichment is most likely controlled by the amount of suspended sediments delivered to the estuary, which remains difficult to monitor. The maximum flow rate at peak river discharge is used here as a proxy for the sediment load and is shown to be strongly correlated with coral Ba/Ca (r = 0.97). After the wet summer of 1991, the coral Ba/Ca flood peak is followed by a plateau that lingers for several months after dissipation of plume waters, signifying an additional flux of Ba that may originate from submarine groundwater seeps and/or mangrove reservoirs. Both Mn and Y are enriched by a factor of ∼ 5 in inshore relative to midshelf corals. Mn/Ca ratios show a seasonal cycle that follows SST (r = 0.7), not river discharge, with an additional high variability in summer suggesting a link with biological activity. P and Cd show no significant seasonal variation and are at a low level at both inshore and midreef locations. However, leaching experiments suggest that part of the coral P is not lattice bound.
dc.publisherPergamon-Elsevier Ltd
dc.sourceGeochimica et Cosmochimica Acta
dc.subjectKeywords: coral; flood; plume; river discharge; trace element; Australia
dc.titleSource of trace element variability in Great Barrier Reef corals affected by the Burdekin flood plumes
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume67
dc.date.issued2003
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.absfor050204 - Environmental Impact Assessment
local.identifier.ariespublicationMigratedxPub5169
local.type.statusPublished Version
local.contributor.affiliationAlibert, C, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKinsley, Leslie, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFallon, Stewart, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationMcCulloch, Malcolm, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBerkelmans, Ray, Great Barrier Reef Marine Park Authority
local.contributor.affiliationMcAllister, Felicity, Australian Institute of Marine Science
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage231
local.bibliographicCitation.lastpage246
local.identifier.doi10.1016/S0016-7037(02)01055-4
dc.date.updated2015-12-11T09:24:50Z
local.identifier.scopusID2-s2.0-0037438902
CollectionsANU Research Publications

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