A radiolarian-based modern analogue dataset for palaeoenviro
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TitleA radiolarian-based modern analogue dataset for palaeoenvironmental reconstructions in the southwest PacificAbstractRadiolarian species relative abundances have been estimated for a suite of 88 surface sediment samples obtained from a broad area of the southwest Pacific/Southern Ocean bounded by 10^circS to 65^circS in latitude, and 145^circE to 170^circW in longitude. This allowed the documentation of a long environmental gradient (28.8 to -. 1.4. ^circC for mean annual sea-surface temperature, SST), and covered the most important surface oceanographic features in the area, including the Subtropical (STF), Subantarctic (SAF) and Antarctic Polar (APF) Fronts.The most abundant species in the dataset show strong relationships to surface hydrography, examples are: Antarctissa spp. (5% abundance isoline is a good indicator for the average position of the SAF), Colonials (5% isoline approximates the average location of the Tasman Front, between New Zealand and Australia), Dictyocoryne profunda and Tetrapyle octacantha (essentially absent in subantarctic/antarctic waters, and documenting warm-water connections to higher latitudes, being present in the Tasmanian retroflection region and/or on the Campbell Plateau).The Factor Analysis model, with a calibration error of ±. 1.3. ^circC, was based on 93 taxa (of the 243 taxa recognised in this study) and 7 factors/assemblages, which explained 87.4% of the total information contained in the dataset. The first five assemblages are readily interpreted in terms of water masses, oceanographic fronts and regions: Subtropical Water/Tasman Front (Factor 1), Circumpolar Surface Water (Factor 2), Equatorial Pacific (Factor 3), Subantarctic Water/Campbell Plateau (Factor 4), and as a subfactor for Subtropical Water (Factor 5). A canonical correspondence analysis identified sea surface temperature as the main environmental explanatory variable for samples with SST 7. ^circC-28. ^circC. Due to the elevated nitrate concentrations in high southern latitude surface waters, nitrate concentration is the main explanatory variable when all samples are considered.In a companion paper, this modern analogue dataset has been applied to relative abundance data from sediment core Y9, in order to reconstruct the SST changes over the last 160. ka at the easternmost boundary of the Campbell Plateau, east of New Zealand. â"' 2015 Elsevier B.V.AcknowledgementsA series of national and international core repositories provided the surface sample material used in this study. These include the core repository at the National Institute of Water and Atmospheric Research (NIWA, New Zealand); three of IODPÅ› (Integrated Ocean Drilling Program) core repository centres: Kochi Core Center (jointly managed by Kochi University and JAMSTEC, the Japan Agency for Marine-Earth Science and Technology), the IODP West Coast repository at Scripps Institution of Oceanography, and the IODP Gulf Coast Repository at Texas A&M University; the Oregon State University Marine Geology Repository located at the College of Earth, Ocean, and Atmospheric Sciences; the Wood Hole Oceanographic Institution core repository; and the IfM/GEOMAR core repository in Kiel. The help of these repositories, and the funding agencies providing support to them, is hereby greatly appreciated. Chlorophyll-a data used in this paper were produced with the Giovanni online data system, developed and maintained by the NASA GES DISC. The study was supported by the New Zealand Government through the GNS Science Global Change through Time Program (Grant number: 540GCT51-00). Thanks are also due to two anonymous reviewers for their comments that helped to improve this paper, Sonja Fry (GNS) for sample preparation, Helen Bostock and Helen Neil (NIWA) for access to the NIWA core repository and sediment description database.
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1st AuthorCortese, G.AuthorCortese, G.Prebble, J.Year2015JournalMarine MicropaleontologyVolume118Pages34-49DOI10.1016/j.marmicro.2015.05.002URLhttps://www.scopus.com/inward/recor.....1b3c330c1f70a40469bf04bdaKeywordsdata setenvironmental gradientoceanic frontpaleoenvironmentradiolariareconstructionrelative abundancesea surface temperaturewarm frontwarm water, Campbell PlateauPacific OceanPacific Ocean (Southwest), BerisDictyocoryne profunda, rank4Author KeywordsPacific OceanPalaeotemperatureRadiolaria
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TypeArticleCitationCortese, G. and Prebble, J. (2015). A radiolarian-based modern analogue dataset for palaeoenvironmental reconstructions in the southwest Pacific. Marine Micropaleontology, 118: 34-49 IdentifierCortese2015Relevancerank4
Prebble, J., A radiolarian-based modern analogue dataset for palaeoenviro , [Cortese2015]. Antarctica NZ, accessed 26/10/2026, https://adam.antarcticanz.govt.nz/nodes/view/63444, 10.1016/j.marmicro.2015.05.002