Vital effects in foraminifera do not compromise the use of D11B as a paleo-pH indicator: Evidence from modeling
[1] The stable boron isotope composition (d11B) of fossil foraminiferal shells is used as a paleo-pH recorder and is therefore one of the most promising paleocarbonate chemistry proxies (‘‘paleoacidimetry’’). One crucial question regarding this proxy is whether foraminifera record the pH of the bulk...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.491.8364 2023-05-15T18:00:53+02:00 Vital effects in foraminifera do not compromise the use of D11B as a paleo-pH indicator: Evidence from modeling Richard E. Zeebe Dieter A. Wolf-gladrow Jelle Bijma The Pennsylvania State University CiteSeerX Archives 2003 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.491.8364 http://www.soest.hawaii.edu/oceanography/faculty/zeebe_files/Publications/ZeebePA03.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.491.8364 http://www.soest.hawaii.edu/oceanography/faculty/zeebe_files/Publications/ZeebePA03.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.soest.hawaii.edu/oceanography/faculty/zeebe_files/Publications/ZeebePA03.pdf text 2003 ftciteseerx 2016-08-14T00:03:49Z [1] The stable boron isotope composition (d11B) of fossil foraminiferal shells is used as a paleo-pH recorder and is therefore one of the most promising paleocarbonate chemistry proxies (‘‘paleoacidimetry’’). One crucial question regarding this proxy is whether foraminifera record the pH of the bulk seawater or the pH of the microenvironment (diffusive boundary layer, 500 mm), which is strongly influenced by life processes. Here we present a novel theoretical approach to address this question by using a diffusion-reaction model. Model results indicate that the d11B in planktonic foraminifera is primarily controlled by the pH of the microenvironment. We therefore predict that the d11B of different species (e.g., symbiont-bearing versus symbiont-barren) or of foraminifera grown in the dark and in the light should be offset from the d11B of inorganic calcite. This theoretical prediction was experimentally confirmed while this paper was written [Hönisch et al., 2003]. Most importantly, the model predicts that this offset is constant over a wide pH range. Thus the use of d11B as a paleo-pH indicator is not compromised through vital effects as modeled here. INDEX TERMS: 1050 Geochemistry: Marine Text Planktonic foraminifera Unknown |
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English |
description |
[1] The stable boron isotope composition (d11B) of fossil foraminiferal shells is used as a paleo-pH recorder and is therefore one of the most promising paleocarbonate chemistry proxies (‘‘paleoacidimetry’’). One crucial question regarding this proxy is whether foraminifera record the pH of the bulk seawater or the pH of the microenvironment (diffusive boundary layer, 500 mm), which is strongly influenced by life processes. Here we present a novel theoretical approach to address this question by using a diffusion-reaction model. Model results indicate that the d11B in planktonic foraminifera is primarily controlled by the pH of the microenvironment. We therefore predict that the d11B of different species (e.g., symbiont-bearing versus symbiont-barren) or of foraminifera grown in the dark and in the light should be offset from the d11B of inorganic calcite. This theoretical prediction was experimentally confirmed while this paper was written [Hönisch et al., 2003]. Most importantly, the model predicts that this offset is constant over a wide pH range. Thus the use of d11B as a paleo-pH indicator is not compromised through vital effects as modeled here. INDEX TERMS: 1050 Geochemistry: Marine |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Richard E. Zeebe Dieter A. Wolf-gladrow Jelle Bijma |
spellingShingle |
Richard E. Zeebe Dieter A. Wolf-gladrow Jelle Bijma Vital effects in foraminifera do not compromise the use of D11B as a paleo-pH indicator: Evidence from modeling |
author_facet |
Richard E. Zeebe Dieter A. Wolf-gladrow Jelle Bijma |
author_sort |
Richard E. Zeebe |
title |
Vital effects in foraminifera do not compromise the use of D11B as a paleo-pH indicator: Evidence from modeling |
title_short |
Vital effects in foraminifera do not compromise the use of D11B as a paleo-pH indicator: Evidence from modeling |
title_full |
Vital effects in foraminifera do not compromise the use of D11B as a paleo-pH indicator: Evidence from modeling |
title_fullStr |
Vital effects in foraminifera do not compromise the use of D11B as a paleo-pH indicator: Evidence from modeling |
title_full_unstemmed |
Vital effects in foraminifera do not compromise the use of D11B as a paleo-pH indicator: Evidence from modeling |
title_sort |
vital effects in foraminifera do not compromise the use of d11b as a paleo-ph indicator: evidence from modeling |
publishDate |
2003 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.491.8364 http://www.soest.hawaii.edu/oceanography/faculty/zeebe_files/Publications/ZeebePA03.pdf |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
http://www.soest.hawaii.edu/oceanography/faculty/zeebe_files/Publications/ZeebePA03.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.491.8364 http://www.soest.hawaii.edu/oceanography/faculty/zeebe_files/Publications/ZeebePA03.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766170154523164672 |