High‐resolution Mg/Ca and δ 18 O patterns in modern Neogloboquadrina pachyderma from the Fram Strait and Irminger Sea

Livsey, Caitlin M., Kozdon, Reinhard, Bauch, Dorothea, Brummer, Geert‐Jan A., Jonkers, Lukas, Orland, Ian, Hill, Tessa M. and Spero, Howard J. (2020) High‐resolution Mg/Ca and δ 18 O patterns in modern Neogloboquadrina pachyderma from the Fram Strait and Irminger Sea Paleoceanography and Paleoclimatology, 35 (9). e2020PA003969. DOI 10.1029/2020PA003969.

[img] Text
Livsey.pdf - Accepted Version
Restricted to Registered users only until 8 February 2021.

Download (5Mb) | Contact
[img] Text
palo20919-sup-0001-2020pa003969-ts01.pdf - Supplemental Material
Restricted to Registered users only

Download (612Kb) | Contact
[img] Other (Excel file)
palo20919-sup-0002-2020pa003969-ts02.xlsx - Supplemental Material
Restricted to Registered users only

Download (37Kb) | Contact
[img] Archive
palo20919-sup-0003-2020pa003969-ds01.zip - Supplemental Material
Restricted to Registered users only

Download (383Kb) | Contact
[img] Archive
palo20919-sup-0004-2020pa003969-ds02.zip - Supplemental Material
Restricted to Registered users only

Download (891Kb) | Contact
[img] Archive
palo20919-sup-0005-2020pa003969-ds03.zip - Supplemental Material
Restricted to Registered users only

Download (730Kb) | Contact
[img] Archive
palo20919-sup-0006-2020pa003969-ds04.zip - Supplemental Material
Restricted to Registered users only

Download (466Kb) | Contact
[img] Archive
palo20919-sup-0007-2020pa003969-ds05.zip - Supplemental Material
Restricted to Registered users only

Download (3110Kb) | Contact
[img] Archive
palo20919-sup-0008-2020pa003969-ds06.zip - Supplemental Material
Restricted to Registered users only

Download (70Mb) | Contact
[img] Archive
palo20919-sup-0009-2020pa003969-ds07.zip - Supplemental Material
Restricted to Registered users only

Download (9Mb) | Contact
[img] Text
2020PA003969.pdf - Published Version
Restricted to Registered users only until 18 February 2021.

Download (5Mb) | Contact

Supplementary data:

Abstract

Neogloboquadrina pachyderma is the dominant species of planktonic foraminifera found in polar waters and is therefore invaluable for paleoceanographic studies of the high latitudes. However, the geochemistry of this species is complicated due to the development of a thick calcite crust in its final growth stage and at greater depths within the water column. We analyzed the in situ Mg/Ca and δ18O in discrete calcite zones using LA‐ICP‐MS, EPMA and SIMS within modern N. pachyderma shells from the highly dynamic Fram Strait and the seasonally isothermal/isohaline Irminger Sea. Here we compare shell geochemistry to the measured temperature, salinity and δ18Osw in which the shells calcified to better understand the controls on N. pachyderma geochemical heterogeneity. We present a relationship between Mg/Ca and temperature in N. pachyderma lamellar calcite that is significantly different than published equations for shells that contained both crust and lamellar calcite. We also document highly variable SIMS δ18O results (up to a 3.3‰ range in single shells) on plankton tow samples which we hypothesize is due to the granular texture of shell walls. Finally, we document that the δ18O of the crust and lamellar calcite of N. pachyderma from an isothermal/isohaline environment are indistinguishable from each other, indicating that shifts in N. pachyderma δ18O are primarily controlled by changes in environmental temperature and/or salinity rather than differences in the sensitivities of the two calcite types to environmental conditions.

Document Type: Article
Keywords: foraminiferal geochemistry, SST proxy, stable isotopes, planktonic foraminifera, Mg/Ca
Research affiliation: MARUM
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
NIOZ
Kiel University
Refereed: Yes
DOI etc.: 10.1029/2020PA003969
ISSN: 2572-4517
Date Deposited: 11 Sep 2020 12:30
Last Modified: 11 Sep 2020 12:30
URI: http://eprints.uni-kiel.de/id/eprint/50459

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...