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- W2011418907 abstract "The Late Quaternary benthic foraminifera of four deep-sea cores off Western Australia (ODP 122–760A, ODP122–762B, BMR96GC21 and RC9–150) have been examined for evidence of increased surface productivity to explain the anomalously low sea-surface paleotemperatures inferred by planktic foraminifera for the last and penultimate glaciations. The δ13C trends ofCibicidoides wuellerstorfi, and differences between the δ13C trends of planktics (Globigerinoides sacculifer) and benthicsC. wuellerstorfi) in the four cores indicate that during stage 6 bottom waters were significantly depleted in δ13C, and strong δ13C gradients were established in the water column, while during stage 2 and the Last Glacial Maximum, δ13C trends did not differ greatly from that of the Holocene. Two main assemblages of benthic foraminifera were identified by principal component analyses: one dominated byUvigerina peregrina, another dominated byU. proboscidea. Abundance of these Uvigerinids, and of taxa preferring an infaunal microhabitat, and ofEpistominella exigua andBulimina aculeata indicate that episodes of high influx of particulate organic matter were established in most sites during glacial episodes, and particularly so during stage 6, while evidence for upwelling during the Last Glacial Maximum is less strong. The Penultimate Glaciation upwellings were established within the areas of low sea-surface paleotemperature indicated by planktic foraminifera. During the Last Interglacial Climax, upwelling appears to have been established in an isolated region offshore from a strengthened Leeuwin Current off North West Cape. Last Glacial Maximum δ13C values ofC. wuellerstorfi at waterdepths of less than 2000 m show smaller than global mean glacial-interglacial changes suggesting the development of a deep hydrological front. A similar vertical stratification/bathyal front was also established during the Penultimate Glaciation." @default.
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- W2011418907 date "1994-04-01" @default.
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- W2011418907 title "Response of deep-sea benthic foraminifera to Late Quaternary climate changes, southeast Indian Ocean, offshore Western Australia" @default.
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