Deep Sea Research Part II: Topical Studies in Oceanography
South Atlantic and benthic foraminifer δ13C deviations: implications for reconstructing the Late Quaternary deep-water circulation
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Palaeoceanographic and palaeoenvironmental controls on late Quaternary benthic foraminifera of the western continental slope of South Africa
2022, Marine MicropaleontologyCitation Excerpt :Species abundances and faunal assemblages allow for the deciphering of past marine environmental conditions (e.g., Kaiho, 1994; Jorissen et al., 1995; Gooday, 2003; Armstrong and Brasier, 2005; Kender et al., 2008; Bergh et al., 2018; Bergh and Compton, 2020). The oxygen isotopic composition (δ18O) of their calcareous tests relates to global ice volume changes (Lisiecki and Raymo, 2005), while their carbon isotopic composition (δ13C) provides insight into palaeoproductivity (e.g., Schmiedl and Mackensen, 1997; Bergh et al., 2021) and past ocean circulation (e.g., Bickert and Wefer, 1999; Bergh et al., 2021). Past studies on benthic foraminifera along the western margin of southern Africa were primarily based on surface grab samples from the continental shelf (Martin, 1981; Lowry, 1987; Schmidt-Sinns, 2008).
Variations in deep water masses along the western margin of South Africa, spanning the last two glacial terminations
2021, Palaeogeography, Palaeoclimatology, PalaeoecologyCitation Excerpt :Future studies on Nd-inputs and concentrations in source areas, and their evolution along flow paths can greatly contribute to resolving these questions and to quantify the mixing of these two water masses along glacial-interglacial cycles. The δ13C record of C. wuellerstorfi is useful as this species secretes calcite with near ambient bottom water carbon isotopic values (Woodruff et al., 1980; Zahn et al., 1986; Bickert and Wefer, 1999). Nutrient-depleted NADW has high δ13C values (>1‰) in the North Atlantic (Kroopnick, 1985) that decrease as NADW flows southwards and organic material oxidises, whereas SCW has consistently lower δ13C values than NADW (Krueger et al., 2012; and references therein).
Tolerance of benthic foraminifera to anthropogenic stressors from three sites of the Egyptian coasts
2016, Egyptian Journal of Aquatic ResearchCitation Excerpt :Benthic foraminifera represent a group of bottom-dwelling single-celled marine organisms, which either prefers to live at the sediment/water interface (epifaunal) or in the sediment (infaunal). Several studies used benthic foraminifera, as environmental variation factors that clearly impacted benthic foraminiferal distribution and frequencies, particularly productivity, bottom water oxygenation, thermo-haline structure of the water body and its bottom-water circulation (e.g. Duplessy et al., 1988; Mackensen et al., 1994; Hemleben et al., 1996; Schmiedl et al., 1998; Bickert and Wefer 1999; Badawi et al., 2005; Hamouda and Awad, 2012; Hamouda et al., 2014 and Badawi, 2015). The increasing destruction of natural habitats causes huge impacts to ecosystems across the globe (Roberts and Hawkins, 1999).
Influence of continental shelf processes in the water mass balance and productivity from stable isotope data on the Southeastern Brazilian coast
2014, Journal of Marine SystemsCitation Excerpt :This result allows one to make possible paleoproductivity reconstructions on the shelf, or to reconstruct the potential fertility of the SACW using δ13C from benthic foraminifers. We also expect that future interpretations based on the δ13C of the carbonate of these organisms should take into account the differences between the shelf and open ocean systems relative to δ13CDIC signal in the water column, which is extremely important as shown by previous studies (Bickert and Wefer, 1999; Pierre et al, 1994). Coupling our understanding of the regional physical oceanography and interpretations of stable isotope variations, a conceptual model of functioning of the continental shelf is proposed (Fig. 4).
Nor ater variability during the last 200ka recorded in an abyssal sediment core off South Africa
2012, Global and Planetary Change