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Lipids as biomarkers for carbon cycling on the Northwest Shelf of Australia: results from a sediment trap study

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dc.contributor Australian Institute Of Marine Science
dc.contributor Commonwealth Scientific & Industrial Research Organisation (csiro)
dc.contributor Australian Inst Marine Sci
dc.contributor Csiro
dc.contributor Marine Res
dc.contributor Australian Institute Of Marine Science (aims) en BRINKMAN, D BURNS, KA VOLKMAN, JK CAVANAGH, JA 2013-02-28T06:41:32Z 2017-03-21T00:47:52Z 2017-03-21T00:47:52Z 2020-07-20T00:19:12Z 2013-02-28T06:41:32Z 2013-02-28T06:41:32Z 2017-03-21T00:47:52Z 2020-07-20T00:19:12Z 2003-01-01
dc.identifier 6007 en
dc.identifier.citation Burns KA, Volkman JK, Cavanagh JE and Brinkman DL (2003) Lipids as biomarkers for carbon cycling on the Northwest Shelf of Australia: Results from a sediment trap study. Marine Chemistry. 80: 103-128. en
dc.identifier.issn 0304-4203
dc.description.abstract Sediment traps were deployed on the Northwest Shelf (NWS) of Australia in November 1996, to determine fluxes of organic matter and inorganic elements from the photic zone to deeper waters in a transect extending from Exmouth Shelf to Exmouth Plateau. Infiltrex II water samplers collected particulate and dissolved organics from the water column near the trap sites. Surface sediments and sediment cores were also collected over the study region. Lipid biomarkers were used to determine the sources of organic carbon and its cycling processes on the NWS. Dry weight fluxes from the traps ranged from 124 to 616 mg m(-2) day(-1) land particulate organic carbon (POC) fluxes ranged from 22 to 42 mg m(-2) day(-1). The biogenic lipids consisted of biomarkers indicative of marine zooplankton, phytoplankton and bacteria, plus traces of land plant markers. A large contribution of unresolved complex material (UCM), which is indicative of petroleum, was detected at four times the biogenic hydrocarbon flux at shallow stations, and up to seven times the biogenic hydrocarbon flux at the most offshore station. There is essentially no river input, and only trace aeolian-derived material to contribute to primary production on the NWS of Australia. Most of the organic matter produced are rapidly recycled in the water column and the small fraction of lipids that settle to the sediments is already partially degraded and undergoes further rapid degradation in the surface sediments. Natural oil seeps also provide utilisable organic carbon to the system. The production and vertical flux rates of organics determined in this study are comparable to those reported in studies of shallow traps in oceanic areas from long-term studies in the Arabian Sea, and other coastal margins such as the Bay of Biscay (France) and California (USA). In offshore areas, most "living" lipid materials passed through the GFF filters thus invalidating POC estimates based on high volume sampling. To adequately assess living (particulate) carbon, gentle filtration of low volume seawater samples is more accurate, as shown by this solid phase absorption study of individual lipid biomarkers. (C) 2002 Elsevier Science B.V. All rights reserved.
dc.language English
dc.language en en
dc.relation.ispartof Null
dc.relation.ispartof Marine Chemistry - pages: 80: 103-128 en
dc.subject Lipid Biomarkers
dc.subject Coastal Waters
dc.subject Marine-sediments
dc.subject Carbon Cycling
dc.subject Vertical Transport
dc.subject Chemistry
dc.subject Northwest Shelf
dc.subject Australia
dc.subject Hydrocarbons
dc.subject Particulate Organic-matter
dc.subject Western-australia
dc.subject Mediterranean-sea
dc.subject Vertical Flux
dc.subject Pacific-ocean
dc.subject Atlantic-ocean
dc.subject Oceanography
dc.subject Chemistry, Multidisciplinary
dc.subject Sediment Traps
dc.subject Arabian-sea
dc.title Lipids as biomarkers for carbon cycling on the Northwest Shelf of Australia: results from a sediment trap study
dc.type journal article en
dc.identifier.wos WOS:000181010400002

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