Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.)
The accurate reconstruction of sea surface temperature (SST) history in climate-sensitive regions (e.g. tropical and polar oceans) became a challenging task in palaeoceanographic research. Biogenic shell carbonate SST proxies successfully developed for tropical regions often fail in cool water envir...
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ftunivbern:oai:boris.unibe.ch:38566 2023-08-20T04:08:01+02:00 Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.) Hippler, Dorothee Kozdon, Reinhard Darling, Kate F. Eisenhauer, Anton Nägler, Thomas F. 2009 application/pdf https://boris.unibe.ch/38566/1/bg-6-1-2009.pdf https://boris.unibe.ch/38566/ eng eng Copernicus Publications https://boris.unibe.ch/38566/ info:eu-repo/semantics/openAccess Hippler, Dorothee; Kozdon, Reinhard; Darling, Kate F.; Eisenhauer, Anton; Nägler, Thomas F. (2009). Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.). Biogeosciences, 6(1), pp. 1-14. Göttingen: Copernicus Publications 10.5194/bg-6-1-2009 <http://dx.doi.org/10.5194/bg-6-1-2009> info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2009 ftunivbern https://doi.org/10.5194/bg-6-1-2009 2023-07-31T21:00:31Z The accurate reconstruction of sea surface temperature (SST) history in climate-sensitive regions (e.g. tropical and polar oceans) became a challenging task in palaeoceanographic research. Biogenic shell carbonate SST proxies successfully developed for tropical regions often fail in cool water environments. Their major regional shortcomings and the cryptic diversity now found within the major high latitude proxy carrier Neogloboquadrina pachyderma (sin.) highlight an urgent need to explore complementary SST proxies for these cool-water regions. Here we incorporate the genetic component into a calibration study of a new SST proxy for the high latitudes. We found that the calcium isotopic composition (δ44/40Ca) of calcite from genotyped net catches and core-top samples of the planktonic foraminifera Neogloboquadrina pachyderma (sin.) is related to temperature and unaffected by genetic variations. The temperature sensitivity has been found to be 0.17 (±0.02)‰ per 1°C, highlighting its potential for downcore applications in open marine cool-water environments. Our results further indicate that in extreme polar environments, below a critical threshold temperature of 2.0 (±0.5)°C associated with salinities below 33.0 (±0.5)‰, a prominent shift in biomineralization affects the δ44/40Ca of genotyped and core-top N. pachyderma (sin.), becoming insensitive to temperature. These findings highlight the need of more systematic calibration studies on single planktonic foraminiferal species in order to unravel species-specific factors influencing the temperature sensitivity of Ca isotope fractionation and to validate the proxies' applicability. Article in Journal/Newspaper Neogloboquadrina pachyderma Planktonic foraminifera BORIS (Bern Open Repository and Information System, University of Bern) Biogeosciences 6 1 1 14 |
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Open Polar |
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BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
description |
The accurate reconstruction of sea surface temperature (SST) history in climate-sensitive regions (e.g. tropical and polar oceans) became a challenging task in palaeoceanographic research. Biogenic shell carbonate SST proxies successfully developed for tropical regions often fail in cool water environments. Their major regional shortcomings and the cryptic diversity now found within the major high latitude proxy carrier Neogloboquadrina pachyderma (sin.) highlight an urgent need to explore complementary SST proxies for these cool-water regions. Here we incorporate the genetic component into a calibration study of a new SST proxy for the high latitudes. We found that the calcium isotopic composition (δ44/40Ca) of calcite from genotyped net catches and core-top samples of the planktonic foraminifera Neogloboquadrina pachyderma (sin.) is related to temperature and unaffected by genetic variations. The temperature sensitivity has been found to be 0.17 (±0.02)‰ per 1°C, highlighting its potential for downcore applications in open marine cool-water environments. Our results further indicate that in extreme polar environments, below a critical threshold temperature of 2.0 (±0.5)°C associated with salinities below 33.0 (±0.5)‰, a prominent shift in biomineralization affects the δ44/40Ca of genotyped and core-top N. pachyderma (sin.), becoming insensitive to temperature. These findings highlight the need of more systematic calibration studies on single planktonic foraminiferal species in order to unravel species-specific factors influencing the temperature sensitivity of Ca isotope fractionation and to validate the proxies' applicability. |
format |
Article in Journal/Newspaper |
author |
Hippler, Dorothee Kozdon, Reinhard Darling, Kate F. Eisenhauer, Anton Nägler, Thomas F. |
spellingShingle |
Hippler, Dorothee Kozdon, Reinhard Darling, Kate F. Eisenhauer, Anton Nägler, Thomas F. Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.) |
author_facet |
Hippler, Dorothee Kozdon, Reinhard Darling, Kate F. Eisenhauer, Anton Nägler, Thomas F. |
author_sort |
Hippler, Dorothee |
title |
Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.) |
title_short |
Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.) |
title_full |
Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.) |
title_fullStr |
Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.) |
title_full_unstemmed |
Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.) |
title_sort |
calcium isotopic composition of high-latitude proxy carrier neogloboquadrina pachyderma (sin.) |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://boris.unibe.ch/38566/1/bg-6-1-2009.pdf https://boris.unibe.ch/38566/ |
genre |
Neogloboquadrina pachyderma Planktonic foraminifera |
genre_facet |
Neogloboquadrina pachyderma Planktonic foraminifera |
op_source |
Hippler, Dorothee; Kozdon, Reinhard; Darling, Kate F.; Eisenhauer, Anton; Nägler, Thomas F. (2009). Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.). Biogeosciences, 6(1), pp. 1-14. Göttingen: Copernicus Publications 10.5194/bg-6-1-2009 <http://dx.doi.org/10.5194/bg-6-1-2009> |
op_relation |
https://boris.unibe.ch/38566/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-6-1-2009 |
container_title |
Biogeosciences |
container_volume |
6 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
14 |
_version_ |
1774720056034328576 |