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<meta content="Molecular diffusive fluxes of oxygen in sediments of Port Phillip Bay in south-eastern Australia
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<meta content="Port Phillip Bay is a large, shallow, semi-enclosed bay in south-eastern Australia. Micro- electrodes were used to measure profiles of oxygen concentration in sediment cores taken from nine sites in the bay in January and February 1994. The effects of sediment surface topography, flow rate of the overlying water and irradiance on the distribution of oxygen in the sediments, and on the molecular diffusive fluxes of oxygen, were determined. Oxygen typically penetrated <3 mm into the sediment. Deeper penetration occurred when oxygen was photosynthetically produced in situ. In most cores the sediments consumed oxygen. Molecular diffusive fluxes of oxygen, determined from the gradient of oxygen in the DBL, were compared with fluxes modelled from the sediment gradient of oxygen. The modelled diffusive fluxes are considered to give better estimates of the diffusive fluxes in situ. Modelled fluxes ranged from 1.5 to 28.5 mmol O2 /m2/day, which was 43% (s.d. = 36%, n = 16) of the total flux at each site. Cores from two sites demonstrated efflux of oxygen, up to 71 mmol O2 /m2/day, as a result of photosynthesis in situ. The high degree of variability in oxygen fluxes within cores demonstrates the dynamism of oxygen cycling in these sediments.
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<meta content="Marine and Freshwater Research" name="eprints.publication" />
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<meta content="Berelson, W.M., Kilgore, T.E. and Heggie, D.T. (1994). Benthic Chambers, Nutrient Fluxes and the Biogeochemistry of the Seafloor from Port Phillip Bay, Australia. Record 1994/16 of the Australian Geological Survey Organisation.
Bird, F.L. (1994). The Effects of Bioturbation in Port Phillip Bay. CSIRO Institute of Natural Resources and the Environment. Technical Report 14, 22pp.
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Capone D.G. and Kiene, R.P. (1988). Comparison of microbial dynamics in marine and freshwater sediments: contrasts in anaerobic carbon catabolism. Limnology and Oceanography 33, 725-49.
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Glud, R. N., Gundersen, J. K., Revsbech, N. P., and Jorgensen, B. B. (1994). Effects on the benthic diffusive boundary layer imposed by microelectrodes. Limnology and Oceanography 39, 462-7.
Gundersen, J.K. and Jorgensen, B.B. (1990). Microstructure of diffusive boundary layers and the oxygen uptake of the sea floor. Nature 345, 604-607.
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Harris, G., Batley, G., Fox, D., Hall, D., Jernakoff, P., Molloy, R., Murray, A., Newell, B., Parslow, J., Skyring, G. and Walker, S. (1996). Port Phillip Bay Environmental Study Final Report. CSIRO, Canberra, Australia.
Heggie, D.T., Skyring, G.W., OBrien, G.W., Reimers, C., Herczeg, A., Moriarty, D.J.W., Burnett, W.C. and Milnes, A.R. (1990). Organic carbon cycling and modern phosphorite formation on the East Australian continental margin: an overview. In: Phosphorite Research and Development (Eds A.J.G. Notholt and I. Jarvis) pp. 87-117. Geological Society Special Publication No. 52.
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Rasmussen, H. and Jorgensen, B.B. (1992). Microelectrode studies of seasonal oxygen uptake in a coastal sediment: role of molecular diffusion. Marine Ecology Progress Series 81, 289-303.
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Tahey, T.M., Duineveld, G.C.A., Berghuis, E.M. and Helder, W. (1994). Relation between sediment-water fluxes of oxygen and silicate and faunal abundance at continental shelf, slope and deep-water stations in the northwest Mediterranean. Marine Ecology Progress Series 104, 119-130.
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Ziebis, W., Forster, S., Huettel, M. and Jorgensen, B.B. (1996). Complex burrows of the mud shrimp Callianassa truncata and the geochemical impact in the sea bed. Nature 382, 619-22.
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<meta content="Port Phillip Bay is a large, shallow, semi-enclosed bay in south-eastern Australia. Micro- electrodes were used to measure profiles of oxygen concentration in sediment cores taken from nine sites in the bay in January and February 1994. The effects of sediment surface topography, flow rate of the overlying water and irradiance on the distribution of oxygen in the sediments, and on the molecular diffusive fluxes of oxygen, were determined. Oxygen typically penetrated <3 mm into the sediment. Deeper penetration occurred when oxygen was photosynthetically produced in situ. In most cores the sediments consumed oxygen. Molecular diffusive fluxes of oxygen, determined from the gradient of oxygen in the DBL, were compared with fluxes modelled from the sediment gradient of oxygen. The modelled diffusive fluxes are considered to give better estimates of the diffusive fluxes in situ. Modelled fluxes ranged from 1.5 to 28.5 mmol O2 /m2/day, which was 43% (s.d. = 36%, n = 16) of the total flux at each site. Cores from two sites demonstrated efflux of oxygen, up to 71 mmol O2 /m2/day, as a result of photosynthesis in situ. The high degree of variability in oxygen fluxes within cores demonstrates the dynamism of oxygen cycling in these sediments.
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<h1 class="ep_tm_pagetitle">Molecular diffusive fluxes of oxygen in sediments of Port Phillip Bay in south-eastern Australia</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Burke, Chris</span> (1999) <xhtml:em>Molecular diffusive fluxes of oxygen in sediments of Port Phillip Bay in south-eastern Australia.</xhtml:em> Marine and Freshwater Research, 50 (6). pp. 557-566. ISSN 1323-1650</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/1912/1/Burke_1999.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1912/1/Burke_1999.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />172Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="2406" name="docid" accept-charset="utf-8" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1071/MF98056">http://dx.doi.org/10.1071/MF98056</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Port Phillip Bay is a large, shallow, semi-enclosed bay in south-eastern Australia. Micro- electrodes were used to measure profiles of oxygen concentration in sediment cores taken from nine sites in the bay in January and February 1994. The effects of sediment surface topography, flow rate of the overlying water and irradiance on the distribution of oxygen in the sediments, and on the molecular diffusive fluxes of oxygen, were determined. Oxygen typically penetrated <3 mm into the sediment. Deeper penetration occurred when oxygen was photosynthetically produced in situ. In most cores the sediments consumed oxygen. Molecular diffusive fluxes of oxygen, determined from the gradient of oxygen in the DBL, were compared with fluxes modelled from the sediment gradient of oxygen. The modelled diffusive fluxes are considered to give better estimates of the diffusive fluxes in situ. Modelled fluxes ranged from 1.5 to 28.5 mmol O2 /m2/day, which was 43% (s.d. = 36%, n = 16) of the total flux at each site. Cores from two sites demonstrated efflux of oxygen, up to 71 mmol O2 /m2/day, as a result of photosynthesis in situ. The high degree of variability in oxygen fluxes within cores demonstrates the dynamism of oxygen cycling in these sediments.
</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">microelectrodes, diffusive fluxes, oxygen, sediments</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270702.html">270000 Biological Sciences > 270700 Ecology and Evolution > 270702 Marine and Estuarine Ecology (incl. Marine Ichthyology)</a><br /><a href="http://eprints.utas.edu.au/view/subjects/260402.html">260000 Earth Sciences > 260400 Oceanography > 260402 Chemical Oceanography</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1912</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Chris Burke</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">13 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">08 Feb 2008 11:47</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1912;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=1912">item control page</a></p>
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