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• W4200260863 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Individual foraminifera analysis (IFA) holds promise to reconstruct seasonal to interannual oceanographic variability. Even though planktonic foraminifera are reliable recorders of environmental conditions on a population level, whether they also are on the level of individuals is unknown. Yet, one of the main assumptions underlying IFA is that each specimen records ocean conditions with negligible noise. Here we test this assumption using stable isotope data measured on groups of four shells of <i>Neogloboquadrina pachyderma</i> from a 16–19 <span class=inline-formula>d</span> resolution sediment trap time series from the subpolar North Atlantic. We find a within-sample variability of 0.11 <span class=inline-formula>‰</span> and 0.10 <span class=inline-formula>‰</span> for <span class=inline-formula><i>δ</i>¹⁸O</span> and <span class=inline-formula><i>δ</i>¹³C</span> respectively that shows no seasonal pattern and exceeds water column variability in spring when conditions are homogeneous down to hundreds of metres. We assess the possible effect of life cycle characteristics and delay due to settling on foraminifera <span class=inline-formula><i>δ</i>¹⁸O</span> variability with simulations using temperature and <span class=inline-formula><i>δ</i>¹⁸O</span><span class=inline-formula>_seawater</span> as input. These simulations indicate that the observed <span class=inline-formula><i>δ</i>¹⁸O</span> variability can only partially be explained by environmental variability. Individual <i>N. pachyderma</i> are thus imperfect recorders of temperature and <span class=inline-formula><i>δ</i>¹⁸O</span><span class=inline-formula>_seawater</span>. Based on these simulations, we estimate the excess noise on <span class=inline-formula><i>δ</i>¹⁸O</span> to be <span class=inline-formula>0.11±0.06</span> <span class=inline-formula>‰</span>. The origin and nature of the recording imprecision require further work, but our analyses highlight the need to take such excess noise into account when interpreting the geochemical variability among individual foraminifera." @default.
• W4200260863 created "2021-12-31" @default.
• W4200260863 creator A5033371043 @default.
• W4200260863 date "2021-11-29" @default.
• W4200260863 modified "2023-10-03" @default.
• W4200260863 title "Reply on RC2" @default.
• W4200260863 doi "https://doi.org/10.5194/cp-2021-87-ac3" @default.
• W4200260863 hasPublicationYear "2021" @default.
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