Environmental Controls on Mg/Ca in Neogloboquadrina incompta: A Core‐Top Study From the Subpolar North Atlantic
Magnesium/calcium paleothermometry is an established tool for reconstructing past surface and deep‐sea temperatures. However, our understanding of nonthermal environmental controls on the uptake of Mg into the calcitic lattice of foraminiferal tests remains limited. Here we present a combined analys...
Gespeichert in:
| Veröffentlicht in: | Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2017-12, Vol.18 (12), p.4276-4298 |
|---|---|
| Hauptverfasser: | , , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext bestellen |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 4298 |
|---|---|
| container_issue | 12 |
| container_start_page | 4276 |
| container_title | Geochemistry, geophysics, geosystems : G3 |
| container_volume | 18 |
| creator | Morley, Audrey Babila, Tali L. Wright, James Ninnemann, Ulysses Kleiven, Kikki Irvali, Nil Rosenthal, Yair |
| description | Magnesium/calcium paleothermometry is an established tool for reconstructing past surface and deep‐sea temperatures. However, our understanding of nonthermal environmental controls on the uptake of Mg into the calcitic lattice of foraminiferal tests remains limited. Here we present a combined analysis of multiple trace element/calcium ratios and stable isotope (δ18O and δ13C) geochemistry on the subpolar planktonic foraminifera Neogloboquadrina incompta to assess the validity of Mg/Ca as a proxy for surface ocean temperature. We identify small size‐specific offsets in Mg/Ca and δ18Oc values for N. incompta that are consistent with depth habitat migration patterns throughout the life cycle of this species. Additionally, an assessment of nonthermal controls on Mg/Ca values reveals that (1) the presence of volcanic ash, (2) the addition of high‐Mg abiotic overgrowths, and (3) ambient seawater carbonate chemistry can have a significant impact on the Mg/Ca‐to‐temperature relationship. For carbonate‐ion concentrations of values > 200 μmol kg−1, we find that temperature exerts the dominant control on Mg/Ca values, while at values |
| doi_str_mv | 10.1002/2017GC007111 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_24P</sourceid><recordid>TN_cdi_proquest_journals_1988052063</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>1988052063</sourcerecordid><originalsourceid>FETCH-LOGICAL-a4349-6aef9e1a01b781356438436639756397cd9b5876e52be171131a0f28b23dcbfb3</originalsourceid><addsrcrecordid>eNp9kM9OwzAMxiMEEmNw4wEicaUsTpr-4TZVW0EacNg4V0mbbp3apEtT0G48As_Ik9BpHHbiYlvWz_7sD6FbIA9ACJ1QAmGaEBICwBkaAafco4SG5yf1Jbrqui0h4HMejdBupj8qa3SjtBM1Tox21tQdNhq_rCeJwJXGr8qsayPNrheFrfShl5umdeIRT4cJq36-vlemxUvXF3s8t6bBbqPwspetqYXFr8a6DZ66WmhX5dfoohR1p27-8hi9z2er5MlbvKXPyXThCZ_5sRcIVcYKBAEZRsB44LPIZ0HA4pAfQl7EkkdhoDiVCoaP2cCWNJKUFbksJRuju-Pe1g6Xq85lW9NbPUhmEEcR4ZQEbKDuj1RuTddZVWatrRph9xmQ7GBqdmrqgLMj_lnVav8vm6VpOqPgs5j9AkZud-0</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1988052063</pqid></control><display><type>article</type><title>Environmental Controls on Mg/Ca in Neogloboquadrina incompta: A Core‐Top Study From the Subpolar North Atlantic</title><source>Wiley Online Library Open Access</source><creator>Morley, Audrey ; Babila, Tali L. ; Wright, James ; Ninnemann, Ulysses ; Kleiven, Kikki ; Irvali, Nil ; Rosenthal, Yair</creator><creatorcontrib>Morley, Audrey ; Babila, Tali L. ; Wright, James ; Ninnemann, Ulysses ; Kleiven, Kikki ; Irvali, Nil ; Rosenthal, Yair</creatorcontrib><description>Magnesium/calcium paleothermometry is an established tool for reconstructing past surface and deep‐sea temperatures. However, our understanding of nonthermal environmental controls on the uptake of Mg into the calcitic lattice of foraminiferal tests remains limited. Here we present a combined analysis of multiple trace element/calcium ratios and stable isotope (δ18O and δ13C) geochemistry on the subpolar planktonic foraminifera Neogloboquadrina incompta to assess the validity of Mg/Ca as a proxy for surface ocean temperature. We identify small size‐specific offsets in Mg/Ca and δ18Oc values for N. incompta that are consistent with depth habitat migration patterns throughout the life cycle of this species. Additionally, an assessment of nonthermal controls on Mg/Ca values reveals that (1) the presence of volcanic ash, (2) the addition of high‐Mg abiotic overgrowths, and (3) ambient seawater carbonate chemistry can have a significant impact on the Mg/Ca‐to‐temperature relationship. For carbonate‐ion concentrations of values > 200 μmol kg−1, we find that temperature exerts the dominant control on Mg/Ca values, while at values < 200 μmol kg−1 the carbonate‐ion concentration of seawater increases the uptake of Mg, thereby resulting in higher‐than‐expected Mg/Ca values at low temperatures. We propose two independent correction schemes to remove the effects of volcanic ash and carbonate‐ion concentration on Mg/Ca values in N. incompta within the calibration data set. Applying the corrections improves the fidelity of past ocean temperature reconstructions.
Key Points
At values below 200 μmol kg−1, the carbonate‐ion concentration of seawater results in higher‐than‐expected Mg/Ca values for N. incompta
The carbonate‐ion concentration effect on Mg/Ca in N. incompta can be quantified and removed using a new correction scheme
The effect of volcanic ash contamination on foraminiferal Mg/Ca values can be effectively removed by subtraction</description><identifier>ISSN: 1525-2027</identifier><identifier>EISSN: 1525-2027</identifier><identifier>DOI: 10.1002/2017GC007111</identifier><language>eng</language><publisher>Washington: John Wiley & Sons, Inc</publisher><subject>Calcium ; Carbonates ; carbonate‐ion concentration effect ; Chemical analysis ; Corrections ; Deep sea ; Deep water ; Environmental control ; Foraminifera ; Geochemistry ; Ion concentration ; Isotopes ; Life cycle ; Low temperature ; Magnesium ; Mg/Ca‐paleothermometry ; Neogloboquadrina incompta ; Ocean temperature ; Oceans ; planktonic foraminifera ; Ratios ; Seawater ; Stable isotopes ; Temperature ; Trace elements ; Uptake ; Volcanic ash ; Water analysis</subject><ispartof>Geochemistry, geophysics, geosystems : G3, 2017-12, Vol.18 (12), p.4276-4298</ispartof><rights>2017. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a4349-6aef9e1a01b781356438436639756397cd9b5876e52be171131a0f28b23dcbfb3</citedby><cites>FETCH-LOGICAL-a4349-6aef9e1a01b781356438436639756397cd9b5876e52be171131a0f28b23dcbfb3</cites><orcidid>0000-0001-5212-9146 ; 0000-0001-9948-9341 ; 0000-0002-1410-9571 ; 0000-0002-8971-0222</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2017GC007111$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2017GC007111$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,11541,27901,27902,45550,45551,46027,46451</link.rule.ids><linktorsrc>$$Uhttps://onlinelibrary.wiley.com/doi/abs/10.1002%2F2017GC007111$$EView_record_in_Wiley-Blackwell$$FView_record_in_$$GWiley-Blackwell</linktorsrc></links><search><creatorcontrib>Morley, Audrey</creatorcontrib><creatorcontrib>Babila, Tali L.</creatorcontrib><creatorcontrib>Wright, James</creatorcontrib><creatorcontrib>Ninnemann, Ulysses</creatorcontrib><creatorcontrib>Kleiven, Kikki</creatorcontrib><creatorcontrib>Irvali, Nil</creatorcontrib><creatorcontrib>Rosenthal, Yair</creatorcontrib><title>Environmental Controls on Mg/Ca in Neogloboquadrina incompta: A Core‐Top Study From the Subpolar North Atlantic</title><title>Geochemistry, geophysics, geosystems : G3</title><description>Magnesium/calcium paleothermometry is an established tool for reconstructing past surface and deep‐sea temperatures. However, our understanding of nonthermal environmental controls on the uptake of Mg into the calcitic lattice of foraminiferal tests remains limited. Here we present a combined analysis of multiple trace element/calcium ratios and stable isotope (δ18O and δ13C) geochemistry on the subpolar planktonic foraminifera Neogloboquadrina incompta to assess the validity of Mg/Ca as a proxy for surface ocean temperature. We identify small size‐specific offsets in Mg/Ca and δ18Oc values for N. incompta that are consistent with depth habitat migration patterns throughout the life cycle of this species. Additionally, an assessment of nonthermal controls on Mg/Ca values reveals that (1) the presence of volcanic ash, (2) the addition of high‐Mg abiotic overgrowths, and (3) ambient seawater carbonate chemistry can have a significant impact on the Mg/Ca‐to‐temperature relationship. For carbonate‐ion concentrations of values > 200 μmol kg−1, we find that temperature exerts the dominant control on Mg/Ca values, while at values < 200 μmol kg−1 the carbonate‐ion concentration of seawater increases the uptake of Mg, thereby resulting in higher‐than‐expected Mg/Ca values at low temperatures. We propose two independent correction schemes to remove the effects of volcanic ash and carbonate‐ion concentration on Mg/Ca values in N. incompta within the calibration data set. Applying the corrections improves the fidelity of past ocean temperature reconstructions.
Key Points
At values below 200 μmol kg−1, the carbonate‐ion concentration of seawater results in higher‐than‐expected Mg/Ca values for N. incompta
The carbonate‐ion concentration effect on Mg/Ca in N. incompta can be quantified and removed using a new correction scheme
The effect of volcanic ash contamination on foraminiferal Mg/Ca values can be effectively removed by subtraction</description><subject>Calcium</subject><subject>Carbonates</subject><subject>carbonate‐ion concentration effect</subject><subject>Chemical analysis</subject><subject>Corrections</subject><subject>Deep sea</subject><subject>Deep water</subject><subject>Environmental control</subject><subject>Foraminifera</subject><subject>Geochemistry</subject><subject>Ion concentration</subject><subject>Isotopes</subject><subject>Life cycle</subject><subject>Low temperature</subject><subject>Magnesium</subject><subject>Mg/Ca‐paleothermometry</subject><subject>Neogloboquadrina incompta</subject><subject>Ocean temperature</subject><subject>Oceans</subject><subject>planktonic foraminifera</subject><subject>Ratios</subject><subject>Seawater</subject><subject>Stable isotopes</subject><subject>Temperature</subject><subject>Trace elements</subject><subject>Uptake</subject><subject>Volcanic ash</subject><subject>Water analysis</subject><issn>1525-2027</issn><issn>1525-2027</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp9kM9OwzAMxiMEEmNw4wEicaUsTpr-4TZVW0EacNg4V0mbbp3apEtT0G48As_Ik9BpHHbiYlvWz_7sD6FbIA9ACJ1QAmGaEBICwBkaAafco4SG5yf1Jbrqui0h4HMejdBupj8qa3SjtBM1Tox21tQdNhq_rCeJwJXGr8qsayPNrheFrfShl5umdeIRT4cJq36-vlemxUvXF3s8t6bBbqPwspetqYXFr8a6DZ66WmhX5dfoohR1p27-8hi9z2er5MlbvKXPyXThCZ_5sRcIVcYKBAEZRsB44LPIZ0HA4pAfQl7EkkdhoDiVCoaP2cCWNJKUFbksJRuju-Pe1g6Xq85lW9NbPUhmEEcR4ZQEbKDuj1RuTddZVWatrRph9xmQ7GBqdmrqgLMj_lnVav8vm6VpOqPgs5j9AkZud-0</recordid><startdate>201712</startdate><enddate>201712</enddate><creator>Morley, Audrey</creator><creator>Babila, Tali L.</creator><creator>Wright, James</creator><creator>Ninnemann, Ulysses</creator><creator>Kleiven, Kikki</creator><creator>Irvali, Nil</creator><creator>Rosenthal, Yair</creator><general>John Wiley & Sons, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><orcidid>https://orcid.org/0000-0001-5212-9146</orcidid><orcidid>https://orcid.org/0000-0001-9948-9341</orcidid><orcidid>https://orcid.org/0000-0002-1410-9571</orcidid><orcidid>https://orcid.org/0000-0002-8971-0222</orcidid></search><sort><creationdate>201712</creationdate><title>Environmental Controls on Mg/Ca in Neogloboquadrina incompta: A Core‐Top Study From the Subpolar North Atlantic</title><author>Morley, Audrey ; Babila, Tali L. ; Wright, James ; Ninnemann, Ulysses ; Kleiven, Kikki ; Irvali, Nil ; Rosenthal, Yair</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4349-6aef9e1a01b781356438436639756397cd9b5876e52be171131a0f28b23dcbfb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Calcium</topic><topic>Carbonates</topic><topic>carbonate‐ion concentration effect</topic><topic>Chemical analysis</topic><topic>Corrections</topic><topic>Deep sea</topic><topic>Deep water</topic><topic>Environmental control</topic><topic>Foraminifera</topic><topic>Geochemistry</topic><topic>Ion concentration</topic><topic>Isotopes</topic><topic>Life cycle</topic><topic>Low temperature</topic><topic>Magnesium</topic><topic>Mg/Ca‐paleothermometry</topic><topic>Neogloboquadrina incompta</topic><topic>Ocean temperature</topic><topic>Oceans</topic><topic>planktonic foraminifera</topic><topic>Ratios</topic><topic>Seawater</topic><topic>Stable isotopes</topic><topic>Temperature</topic><topic>Trace elements</topic><topic>Uptake</topic><topic>Volcanic ash</topic><topic>Water analysis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Morley, Audrey</creatorcontrib><creatorcontrib>Babila, Tali L.</creatorcontrib><creatorcontrib>Wright, James</creatorcontrib><creatorcontrib>Ninnemann, Ulysses</creatorcontrib><creatorcontrib>Kleiven, Kikki</creatorcontrib><creatorcontrib>Irvali, Nil</creatorcontrib><creatorcontrib>Rosenthal, Yair</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Morley, Audrey</au><au>Babila, Tali L.</au><au>Wright, James</au><au>Ninnemann, Ulysses</au><au>Kleiven, Kikki</au><au>Irvali, Nil</au><au>Rosenthal, Yair</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Environmental Controls on Mg/Ca in Neogloboquadrina incompta: A Core‐Top Study From the Subpolar North Atlantic</atitle><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle><date>2017-12</date><risdate>2017</risdate><volume>18</volume><issue>12</issue><spage>4276</spage><epage>4298</epage><pages>4276-4298</pages><issn>1525-2027</issn><eissn>1525-2027</eissn><abstract>Magnesium/calcium paleothermometry is an established tool for reconstructing past surface and deep‐sea temperatures. However, our understanding of nonthermal environmental controls on the uptake of Mg into the calcitic lattice of foraminiferal tests remains limited. Here we present a combined analysis of multiple trace element/calcium ratios and stable isotope (δ18O and δ13C) geochemistry on the subpolar planktonic foraminifera Neogloboquadrina incompta to assess the validity of Mg/Ca as a proxy for surface ocean temperature. We identify small size‐specific offsets in Mg/Ca and δ18Oc values for N. incompta that are consistent with depth habitat migration patterns throughout the life cycle of this species. Additionally, an assessment of nonthermal controls on Mg/Ca values reveals that (1) the presence of volcanic ash, (2) the addition of high‐Mg abiotic overgrowths, and (3) ambient seawater carbonate chemistry can have a significant impact on the Mg/Ca‐to‐temperature relationship. For carbonate‐ion concentrations of values > 200 μmol kg−1, we find that temperature exerts the dominant control on Mg/Ca values, while at values < 200 μmol kg−1 the carbonate‐ion concentration of seawater increases the uptake of Mg, thereby resulting in higher‐than‐expected Mg/Ca values at low temperatures. We propose two independent correction schemes to remove the effects of volcanic ash and carbonate‐ion concentration on Mg/Ca values in N. incompta within the calibration data set. Applying the corrections improves the fidelity of past ocean temperature reconstructions.
Key Points
At values below 200 μmol kg−1, the carbonate‐ion concentration of seawater results in higher‐than‐expected Mg/Ca values for N. incompta
The carbonate‐ion concentration effect on Mg/Ca in N. incompta can be quantified and removed using a new correction scheme
The effect of volcanic ash contamination on foraminiferal Mg/Ca values can be effectively removed by subtraction</abstract><cop>Washington</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/2017GC007111</doi><tpages>23</tpages><orcidid>https://orcid.org/0000-0001-5212-9146</orcidid><orcidid>https://orcid.org/0000-0001-9948-9341</orcidid><orcidid>https://orcid.org/0000-0002-1410-9571</orcidid><orcidid>https://orcid.org/0000-0002-8971-0222</orcidid><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext_linktorsrc |
| identifier | ISSN: 1525-2027 |
| ispartof | Geochemistry, geophysics, geosystems : G3, 2017-12, Vol.18 (12), p.4276-4298 |
| issn | 1525-2027 1525-2027 |
| language | eng |
| recordid | cdi_proquest_journals_1988052063 |
| source | Wiley Online Library Open Access |
| subjects | Calcium Carbonates carbonate‐ion concentration effect Chemical analysis Corrections Deep sea Deep water Environmental control Foraminifera Geochemistry Ion concentration Isotopes Life cycle Low temperature Magnesium Mg/Ca‐paleothermometry Neogloboquadrina incompta Ocean temperature Oceans planktonic foraminifera Ratios Seawater Stable isotopes Temperature Trace elements Uptake Volcanic ash Water analysis |
| title | Environmental Controls on Mg/Ca in Neogloboquadrina incompta: A Core‐Top Study From the Subpolar North Atlantic |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-07T16%3A49%3A47IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_24P&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Environmental%20Controls%20on%20Mg/Ca%20in%20Neogloboquadrina%20incompta:%20A%20Core%E2%80%90Top%20Study%20From%20the%20Subpolar%20North%20Atlantic&rft.jtitle=Geochemistry,%20geophysics,%20geosystems%20:%20G3&rft.au=Morley,%20Audrey&rft.date=2017-12&rft.volume=18&rft.issue=12&rft.spage=4276&rft.epage=4298&rft.pages=4276-4298&rft.issn=1525-2027&rft.eissn=1525-2027&rft_id=info:doi/10.1002/2017GC007111&rft_dat=%3Cproquest_24P%3E1988052063%3C/proquest_24P%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1988052063&rft_id=info:pmid/&rfr_iscdi=true |