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

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dc.contributor Australian Institute Of Marine Science
dc.contributor Australian National University
dc.contributor Australian Natl Univ
dc.contributor Great Barrier Reef Marine Pk Author
dc.contributor Australian Inst Marine Sci
dc.contributor Res Sch Earth Sci
dc.contributor Australian Institute Of Marine Science (aims) en MCALLISTER, F ALIBERT, C KINSLEY, L FALLON, SJ MCCULLOCH, MT BERKELMANS, R 2013-02-28T06:42:58Z 2013-02-28T06:42:58Z 2017-03-21T00:58:39Z 2019-07-08T02:26:54Z 2013-02-28T06:42:58Z 2013-02-28T06:42:58Z 2017-03-21T00:58:39Z 2019-07-08T02:26:54Z 2003-01-01
dc.identifier 6746 en
dc.identifier.citation Alibert CA, Kinsley L, Fallon S, McCulloch MT, Berkelmans R and McAllister FA (2003) Source of trace element variability in Great Barrier Reef corals affected by the Burdekin flood plumes. Geochimica et Cosmochimica Acta. 67: 231-246. en
dc.identifier.issn 0016-7037
dc.description Link to abstract/full text - en
dc.description.abstract 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 mumol/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 similar to5 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. Copyright (C) 2003 Elsevier Science Ltd.
dc.description.uri en
dc.language English
dc.language en en
dc.relation.ispartof Null
dc.relation.ispartof Geochimica et Cosmochimica Acta - pages: 67: 231-246 en
dc.subject Southern Oscillation
dc.subject Australian Rainfall
dc.subject Porites Corals
dc.subject Equatorial Pacific
dc.subject Geochemistry & Geophysics
dc.subject Mississippi River
dc.subject Galapagos-islands
dc.subject Manganese Oxides
dc.subject Sediment-transport
dc.subject Sea-surface Temperature
dc.subject Coastal Waters
dc.title Source of trace element variability in Great Barrier Reef corals affected by the Burdekin flood plumes
dc.type journal article en
dc.identifier.doi 10.1016/S0016-7037(02)01055-4 en
dc.identifier.wos WOS:000180367500006

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