Examining 239+240Pu, 210Pb and historical events to determine carbon, nitrogen and phosphorus burial in mangrove sediments of Moreton Bay, Australia

Christian J. Sanders, Isaac R. Santos, Damien T. Maher, Joshua L. Breithaupt, Joseph M. Smoak, Michael E Ketterer, Mitchell Call, Luciana Sanders, Bradley D. Eyre

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Two sediment cores were collected in a mangrove forest to construct geochronologies for the previous century using natural and anthropogenic radionuclide tracers. Both sediment cores were dated using 239+240Pu global fallout signatures as well as 210Pb, applying both the Constant Initial Concentration (CIC) and the Constant Rate of Supply (CRS) models. The 239+240Pu and CIC model are interpreted as having comparable sediment accretion rates (SAR) below an apparent mixed region in the upper ~5 to 10 cm. In contrast, the CRS dating method shows high sediment accretion rates in the uppermost intervals, which is substantially reduced over the lower intervals of the 100-year record. A local anthropogenic nutrient signal is reflected in the high total phosphorus (TP) concentration in younger sediments. The carbon/nitrogen molar ratios and δ15N values further support a local anthropogenic nutrient enrichment signal. The origin of these signals is likely the treated sewage discharge to Moreton Bay which began in the early 1970s. While the 239+240Pu and CIC models can only produce rates averaged over the intervals of interest within the profile, the 210Pb CRS model identifies elevated rates of sediment accretion, organic carbon (OC), nitrogen (N), and TP burial from 2000 to 2013. From 1920 to 2000, the three dating methods provide similar OC, N and TP burial rates, ~150, 10 and 2 g m-2 year-1, respectively, which are comparable to global averages.

Original languageEnglish (US)
Pages (from-to)623-629
Number of pages7
JournalJournal of Environmental Radioactivity
Volume151
DOIs
StatePublished - Jan 1 2016
Externally publishedYes

Fingerprint

Burial
Phosphorus
mangrove
Sediments
Nitrogen
Carbon
phosphorus
nitrogen
carbon
sediment
Food
Wetlands
Sewage
Organic carbon
Radioisotopes
Nutrients
dating method
accretion
Geochronology
sediment core

Keywords

  • Carbon accumulation
  • Geochronology
  • Impacted mangroves
  • Lead-210
  • Plutonium-239+240

ASJC Scopus subject areas

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis
  • Waste Management and Disposal
  • Pollution

Cite this

Examining 239+240Pu, 210Pb and historical events to determine carbon, nitrogen and phosphorus burial in mangrove sediments of Moreton Bay, Australia. / Sanders, Christian J.; Santos, Isaac R.; Maher, Damien T.; Breithaupt, Joshua L.; Smoak, Joseph M.; Ketterer, Michael E; Call, Mitchell; Sanders, Luciana; Eyre, Bradley D.

In: Journal of Environmental Radioactivity, Vol. 151, 01.01.2016, p. 623-629.

Research output: Contribution to journalArticle

Sanders, Christian J. ; Santos, Isaac R. ; Maher, Damien T. ; Breithaupt, Joshua L. ; Smoak, Joseph M. ; Ketterer, Michael E ; Call, Mitchell ; Sanders, Luciana ; Eyre, Bradley D. / Examining 239+240Pu, 210Pb and historical events to determine carbon, nitrogen and phosphorus burial in mangrove sediments of Moreton Bay, Australia. In: Journal of Environmental Radioactivity. 2016 ; Vol. 151. pp. 623-629.
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