Data

Baseline biogeochemical data from Australia’s continental margin links seabed sediments to water column characteristics

Australian Ocean Data Network
Radke, L. ; Nicholas, T. ; Thompson, P.A. ; Li, J. ; Raes, E. ; Carey, M. ; Atkinson, I. ; Huang, Z. ; Trafford, J. ; Nichol, S.
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/100112&rft.title=Baseline biogeochemical data from Australia’s continental margin links seabed sediments to water column characteristics&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/100112&rft.publisher=CSIRO Publishing&rft.description=Surficial marine sediments are an important source of nutrients for productivity and biodiversity yet the biogeochemistry of these sediments is poorly known in Australia. Seabed samples were collected at >350 locations in Australia’s western, northern and eastern continental margins during federal government surveys (2007-2014). Parameters analysed included measures of organic matter (OM) source (δ13C, δ15N and C:N-ratios), concentration (total organic carbon (%TOC) and surface area normalised TOC (OC:SA)) and bioavailability (chlorin indices, total reactive chlorins, total oxygen uptake, total sediment metabolism (TSM), sediment oxygen demand (SOD) and SOD and TSM normalised to TOC). The aim of this study is to summarise these biogeochemical ‘baseline’ data, and make contextualised inferences about processes that govern the observed concentrations. The OM was mainly from marine sources and OC:SA broadly reflected water column productivity (MODIS). Approximately 40% of sediments were organic-poor by global standards reflecting seawater oligotrophy; ~12% were organic-rich due to benthic production, high water column productivity and pockmark formation. OM freshness varied due to pigment degradation in water columns and dilution with refractory OM in reworked sediments. δ15N values confirmed the importance of N2 fixation to Timor Sea productivity, and point to recycling of fixed nitrogen within food chains in Western Australia. Citation: Radke Lynda, Nicholas Tony, Thompson Peter A., Li Jin, Raes Eric, Carey Matthew, Atkinson Ian, Huang Zhi, Trafford Janice, Nichol Scott (2017) Baseline biogeochemical data from Australia’s continental margin links seabed sediments to water column characteristics. Marine and Freshwater Research 68, 1593-1617. https://doi.org/10.1071/MF16219Maintenance and Update Frequency: asNeededStatement: Manuscript to be submitted to Marine and Freshwater Research&rft.creator=Radke, L. &rft.creator=Nicholas, T. &rft.creator=Thompson, P.A. &rft.creator=Li, J. &rft.creator=Raes, E. &rft.creator=Carey, M. &rft.creator=Atkinson, I. &rft.creator=Huang, Z. &rft.creator=Trafford, J. &rft.creator=Nichol, S. &rft.date=2016&rft.coverage=westlimit=112.92; southlimit=-54.75; eastlimit=159.11; northlimit=-9.2402&rft.coverage=westlimit=112.92; southlimit=-54.75; eastlimit=159.11; northlimit=-9.2402&rft_rights= https://creativecommons.org/licenses/by-nc-nd/4.0/deed.en&rft_rights=Creative Commons NonCommercial NoDerivs International Licence&rft_rights=CC-BY-NC-ND&rft_rights=4.0&rft_rights=Journal compilation CSIRO 2017&rft_rights=Creative Commons NonCommercial NoDerivs International Licence&rft_rights= https://creativecommons.org/licenses/by-nc-nd/4.0/deed.en&rft_subject=oceans&rft_subject=EARTH SCIENCES&rft_subject=diazotroph&rft_subject=particulate&rft_subject=organic carbon&rft_subject=totol nitrogen&rft_subject=Trichodesmium&rft_subject=marine, geochemistry, seabed, sediments&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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Journal compilation CSIRO 2017

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Brief description

Surficial marine sediments are an important source of nutrients for productivity and biodiversity yet the biogeochemistry of these sediments is poorly known in Australia. Seabed samples were collected at >350 locations in Australia’s western, northern and eastern continental margins during federal government surveys (2007-2014). Parameters analysed included measures of organic matter (OM) source (δ13C, δ15N and C:N-ratios), concentration (total organic carbon (%TOC) and surface area normalised TOC (OC:SA)) and bioavailability (chlorin indices, total reactive chlorins, total oxygen uptake, total sediment metabolism (TSM), sediment oxygen demand (SOD) and SOD and TSM normalised to TOC). The aim of this study is to summarise these biogeochemical ‘baseline’ data, and make contextualised inferences about processes that govern the observed concentrations. The OM was mainly from marine sources and OC:SA broadly reflected water column productivity (MODIS). Approximately 40% of sediments were organic-poor by global standards reflecting seawater oligotrophy; ~12% were organic-rich due to benthic production, high water column productivity and pockmark formation. OM freshness varied due to pigment degradation in water columns and dilution with refractory OM in reworked sediments. δ15N values confirmed the importance of N2 fixation to Timor Sea productivity, and point to recycling of fixed nitrogen within food chains in Western Australia. Citation: Radke Lynda, Nicholas Tony, Thompson Peter A., Li Jin, Raes Eric, Carey Matthew, Atkinson Ian, Huang Zhi, Trafford Janice, Nichol Scott (2017) Baseline biogeochemical data from Australia’s continental margin links seabed sediments to water column characteristics. Marine and Freshwater Research 68, 1593-1617. https://doi.org/10.1071/MF16219

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Maintenance and Update Frequency: asNeeded
Statement: Manuscript to be submitted to Marine and Freshwater Research

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Manuscript to be submitted to Marine and Freshwater Research

Issued: 22 05 2024

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159.11,-9.2402 159.11,-54.75 112.92,-54.75 112.92,-9.2402 159.11,-9.2402

136.015,-31.9951

text: westlimit=112.92; southlimit=-54.75; eastlimit=159.11; northlimit=-9.2402

Subjects
EARTH SCIENCES | Published_External | Trichodesmium | diazotroph | marine, geochemistry, seabed, sediments | oceans | organic carbon | particulate | totol nitrogen |

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doi : https://doi.org/10.1071/MF16219

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