Effect of seawater carbonate concentration on foraminiferal carbon and oxygen isotopes

Abstract

essentially induced by local modifications of the electronic properties of a surface near chemisorbed particles and hence, we believe, are of general importance for chemical processes at surfaces whenever the diffusion lengths of adsorbing species reach critical values compared with their lateral distribution.

Ocean acidification and temperature rise: effects on calcification during early development of the cuttlefish Sepia officinalis

“…Our current knowledge supports the hypothesis that a broad range of them indeed undergo reduced calcification or increased dissolution rates in response to predicted atmospheric pCO 2 increases (see review by Kroeker et al 2010): corals (see review by Hoegh-Guldberg et al 2007), planktonic foraminifera (e.g. Spero et al 1997;Bijma et al 2002), coccolithophores (e.g. Riebesell et al 2000;Zondervan et al 2001), bivalves (e.g.…”

Isotope offsets in marine diatom δ18O over the last 200 ka

“…While vital effects have been widely documented in biogenic carbonates such as foraminifera and ostracods (Duplessy et al, 1970;Wefer and Berger, 1991;Lea, 1993, 1996;Spero et al, 1997;Xia et al, 1997;Bemis et al, 1998;von Grafenstein et al, 1999;Chivas et al, 2002;Holmes and Chivas, 2002), almost all culture (Binz, 1987;Brandriss et al, 1998;Schmidt et al, 2001), down-core (Juillet-Leclerc and Labeyrie, 1987;Shemesh et al, 1995) and water column studies have found no clear evidence of a vital effect in δ 18 Odiatom. Recent work, however, has shown the potential for δ 18 Odiatom vital effects to exist with offsets of up to 3.51‰ (mean offset = 1.23‰, n = 25) observed between two size fractions of diatoms at Ocean Drilling …”

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

“…A possible limitation of this method is the observation that initial test weights of several species of planktonic foraminifera vary both regionally and temporally (Barker and Elderfield, 2002). Shell weights are thought to be sensitive to changes in the [CO 3 = ] of seawater in which they grow and hence may vary in parallel with changes in atmospheric CO 2 through time (Spero et al, 1997;Bijma et al, 1999;Barker and Elderfield, 2002). Obviously the initial test weight must be known in order to calculate weight loss due to dissolution.…”