Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment
Hendry, Katharine R.
Rickaby, Rosalind E. M.
Meredith, Michael P.
MetadataShow full item record
The polar foraminifera Neogloboquadrina pachyderma (sinistral) dominates assemblages from the high latitude Southern Ocean, which is a key region for paleoclimate studies. Here, we use N. pachyderma (s.) harvested from sediment traps off the West Antarctic Peninsula to construct a seasonal time series for the calibration of calcite proxies in a high latitude seasonal sea-ice environment where temperature is decoupled from other environmental parameters. We have used a combination of δ18OCaCO3 and δ13CCaCO3 to decipher the calcification temperature and salinity, which reflect that N. pachyderma (s.) live in surface waters throughout the year, and at the ice-water interface in austral winter. Further, our results demonstrate that, during winter, the uptake of trace metals into N. pachyderma (s.) calcite is influenced by secondary environmental conditions in addition to temperature during periods of sea-ice. We suggest an elevated carbonate ion concentration at the ice-water interface resulting from biological utilisation CO2 could influence calcification in foraminifera. We demonstrate that for N. pachyderma (s.) Mg/Ca and Sr/Ca ratios are linear functions of calcification temperature and [CO32-]. N. pachyderma (s.) Mg/Ca ratios exhibit temperature sensitivity similar to previous studies (~ 10 % per °C) and a sensitivity to [CO32-] of ~ 1 % per μmol kg-1). Sr/Ca ratios are less sensitive to environmental parameters, exhibiting < 1% increase per °C and per 10 μmol kg-1. We show how a multi-proxy approach could be used to constrain past high latitude surface water temperature and [CO32-].
Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 278 (2009): 67-77, doi:10.1016/j.epsl.2008.11.026.
Suggested CitationPreprint: Hendry, Katharine R., Rickaby, Rosalind E. M., Meredith, Michael P., Elderfield, Henry, "Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment", 2008-11, https://doi.org/10.1016/j.epsl.2008.11.026, https://hdl.handle.net/1912/4821
Showing items related by title, author, creator and subject.
Bioactive trace metals and their isotopes as paleoproductivity proxies: an assessment using GEOTRACES-era data Horner, Tristan J.; Little, Susan; Conway, Tim M.; Farmer, Jesse R.; Hertzberg, Jennifer; Janssen, David J.; Lough, Alastair; McKay, Jennifer L.; Tessin, Allyson C.; Galer, Stephen J. G.; Jaccard, Samuel L.; Lacan, Francois; Paytan, Adina; Wuttig, Kathrin (American Geophysical Union, 2021-05-24)Phytoplankton productivity and export sequester climatically significant quantities of atmospheric carbon dioxide as particulate organic carbon through a suite of processes termed the biological pump. Constraining how the ...
Profiles of dissolved trace elements collected using a trace-metal clean rosette from surface to 1000m depth from two CLIVAR P16 cruises in 2005 and 2006 Landing, William M.; Measures, Christopher I.; Resing, Joseph A. (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: firstname.lastname@example.org, 2019-10-02)Profiles of dissolved trace elements collected using a trace-metal clean rosette from surface to 1000m depth from two CLIVAR P16 cruises in 2005 and 2006. For a complete list of measurements, refer to the full dataset ...
Amundsen Sea sea-ice variability, atmospheric circulation, and spatial variations in snow isotopic composition from new West Antarctic firn cores Criscitiello, Alison S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2014-02)Recent work has documented dramatic changes in the West Antarctic Ice Sheet (WAIS) over the past 30 years (e.g., mass loss, glacier acceleration, surface warming) due largely to the influence of the marine environment. ...