Stable Oxygen Isotope Composition Is Biased by Shell Calcification Intensity in Planktonic Foraminifera

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F20%3A10422875" target="_blank" >RIV/00216208:11310/20:10422875 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=dQ_AOdChqF" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=dQ_AOdChqF</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2020PA003941" target="_blank" >10.1029/2020PA003941</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stable Oxygen Isotope Composition Is Biased by Shell Calcification Intensity in Planktonic Foraminifera

Popis výsledku v původním jazyce

Planktonic Foraminifera are widely used for environmental reconstructions through measurements of their shell&apos;s geochemical characteristics, including its stable oxygen and carbon isotope composition. Using these parameters as unbiased proxies requires a firm knowledge of all potential confounding factors influencing foraminiferal shell geochemistry. One such parameter is the shell calcification intensity (shell weight normalized for shell size) that may influence the shell delta O-18 value either bioenergetically (by reducing energy available and required for equilibrium isotope fractionation during faster calcification) or kinetically (by influencing calcification depth through the shell&apos;s density contrast with seawater). Specimens from the Globigerinoides ruber/elongatus complex from a sediment trap in the North Atlantic have been used to quantify the influence of shell calcification intensity on shell delta O-18 values. Shell calcification intensity was found to have a significant effect on the shell stable oxygen isotope composition in all species. Through model fitting, it is suggested that the effect size may be in a range of 1 parts per thousand to 2 parts per thousand (depending on species, depth migration, and local oceanographic conditions). We show that the confounding effect of shell calcification intensity on stable oxygen isotope composition can be of importance, depending on the anticipated precision of the derived reconstructions. A framework is provided to quantify this effect in future studies.

Název v anglickém jazyce

Stable Oxygen Isotope Composition Is Biased by Shell Calcification Intensity in Planktonic Foraminifera

Popis výsledku anglicky

Planktonic Foraminifera are widely used for environmental reconstructions through measurements of their shell&apos;s geochemical characteristics, including its stable oxygen and carbon isotope composition. Using these parameters as unbiased proxies requires a firm knowledge of all potential confounding factors influencing foraminiferal shell geochemistry. One such parameter is the shell calcification intensity (shell weight normalized for shell size) that may influence the shell delta O-18 value either bioenergetically (by reducing energy available and required for equilibrium isotope fractionation during faster calcification) or kinetically (by influencing calcification depth through the shell&apos;s density contrast with seawater). Specimens from the Globigerinoides ruber/elongatus complex from a sediment trap in the North Atlantic have been used to quantify the influence of shell calcification intensity on shell delta O-18 values. Shell calcification intensity was found to have a significant effect on the shell stable oxygen isotope composition in all species. Through model fitting, it is suggested that the effect size may be in a range of 1 parts per thousand to 2 parts per thousand (depending on species, depth migration, and local oceanographic conditions). We show that the confounding effect of shell calcification intensity on stable oxygen isotope composition can be of importance, depending on the anticipated precision of the derived reconstructions. A framework is provided to quantify this effect in future studies.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Paleoceanography and Paleoclimatology

ISSN

2572-4517

e-ISSN

—

Svazek periodika

35

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

20

Strana od-do

e2020PA003941

Kód UT WoS článku

000595926100007

EID výsledku v databázi Scopus

2-s2.0-85096453641