Historical August Sea-Surface Temperature Estimates Utilising a Diatom Transfer Function with Core MD88-787

• Other Authors: Armand, Leanne (hasPrincipalInvestigator), De Deckker, Patrick (collaborator), De Deckker, Patrick, Prof (collaborator), Department of Geology, The Australian National University (ANU) (hasAssociationWith), Pichon, Jean-Jacques (collaborator), The Australian National University (ANU) (hasAssociationWith), Université of Bordeaux I (hasAssociationWith)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: biota; environment; DIATOMS; EARTH SCIENCE; BIOLOGICAL CLASSIFICATION; PLANTS; MICROALGAE; SEA SURFACE TEMPERATURE; OCEANS; OCEAN TEMPERATURE; Transfer function; core_depth; taxonomic_name; taxonomic_group_count; latitude; longitude; extrapolated_age_scale; diatom_transfer_function_communality; diatom_transfer_function_sea_surface_temperature; Antarc*; Antarctic
• Online Access: https://researchdata.edu.au/historical-august-sea-md88-787/679671

Maintenance and Update Frequency: notPlanned Statement: Three sources of data are procured to perform the Diatom Transfer Function (DTF). The first set taken is the ranked diatom species data from core tops (i.e. Antarctic Diatom Database). The second data set is taken from the modern environmental variable to be related. In this study, the present-day reference for sea-surface temperature, the World Ocean Atlas (WOA, 1994) is used. The third dataset comprises the down-core data which contains the ranked data derived from the same diatom species used in the modern database. The transfer function, DTF 109/24/6, under-estimates in the 4-8oC range and over-estimates in the 0-4oC range, but in each case the residuals are confined to within ±2oC. The model does not take into account dissolution of the diatoms in the samples, but does increase the number of factors to account for the wider distributional patterns. The DTF have been shown in the reference 109 database to be possibly over-estimated by up to 1.5oC. The answer may simply lie in the fact that the 109 database is too small and restrictive. Parameters for Antarctic Diatom Database: Diatom species, Leanne K. Armand code, core code, core coordinates (degrees, decimal minutes), total number of specimens recorded in each core, % of old species, % of data used in 24 major species Parameters for historical sea-surface temperature estimates: Core depth (cm), analyseries extrapolated age scale (ka) at 10cm intervals, DTF commonality and sea-surface temperature August (oC). Parameters for the raw diatom counts: Core depth (cm), diatom species, diatom subtotal and silica subtotal. Statement: Use of Alfred-Wegner-Institut computer programs PalaeoToolBox and MacTransfer (Sieger, Nov 1996) which incorporates the Imbrie and Kipp (1971) subroutines (Cabfac, Regress and Thread) have been used in the work produced here. These programs modernise and simplify the original Factor Analysis Package for PC's (Schrader 1989). Credit Centre des Faibles Radioactivities mixte ...