Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.536
IF3.536
IF 5-year value: 3.967
IF 5-year
3.967
CiteScore value: 6.6
CiteScore
6.6
SNIP value: 1.262
SNIP1.262
IPP value: 3.90
IPP3.90
SJR value: 2.185
SJR2.185
Scimago H <br class='widget-line-break'>index value: 71
Scimago H
index
71
h5-index value: 40
h5-index40
Preprints
https://doi.org/10.5194/cp-2020-26
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2020-26
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  10 Mar 2020

10 Mar 2020

Review status
This preprint is currently under review for the journal CP.

Evaluation of isotopes and elements in planktonic foraminifera from the Mediterranean Sea as recorders of seawater oxygen isotopes and salinity

Linda K. Dämmer1, Lennart de Nooijer1, Erik van Sebille2, Jan Haak1, and Gert-Jan Reichart1,3 Linda K. Dämmer et al.
  • 1Department of Ocean Systems, NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University, Texel, The Netherlands
  • 2Department of Physics, Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University, Utrecht, The Netherlands
  • 3Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, The Netherlands

Abstract. The Mediterranean Sea is characterized by a relatively strong west to east salinity gradient, which makes it an area suitable to test the effect of salinity on foraminiferal shell geochemistry. We collected living specimens of the planktonic foraminifer Globigerinoides ruber (white) to analyse the relation between element/Ca ratios, stable oxygen isotopes of their shells and surface seawater salinity, isotopic composition and temperature. The oxygen isotopes of sea surface water correlate with salinity in the Mediterranean also during winter, when sampled for this study. Sea water oxygen and hydrogen isotopes are positively correlated in both the eastern and western Mediterranean Sea, though especially in the eastern part the relationship differs from values reported previously for that area. The slope between salinity and seawater oxygen isotopes is lower than previously published. Still, despite the rather modest slope, seawater and foraminiferal carbonate oxygen isotopes are correlated in our dataset although with large residuals and high residual variability. This scatter can be due to either biological variability in vital effects or environmental variability. Numerical models backtracking particles show ocean current driven mixing of particles of different origin might dampen sensitivity and could result in an offset caused by horizontal transport. Results show that Na/Ca is positively correlated to salinity and independent of temperature. Foraminiferal Mg/Ca increases with temperature, as expected, and in line with earlier calibrations, also in the high salinity environment. By using living foraminifera during winter, the previously established Mg/Ca-temperature calibration is extended to temperatures below 18 °C, which is a fundamental prerequisite of using single foraminifera for reconstructing past seasonality.

Linda K. Dämmer et al.

Interactive discussion

Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Login for Authors/Editors] [Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Linda K. Dämmer et al.

Linda K. Dämmer et al.

Viewed

Total article views: 472 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
337 97 38 472 31 36
  • HTML: 337
  • PDF: 97
  • XML: 38
  • Total: 472
  • BibTeX: 31
  • EndNote: 36
Views and downloads (calculated since 10 Mar 2020)
Cumulative views and downloads (calculated since 10 Mar 2020)

Viewed (geographical distribution)

Total article views: 380 (including HTML, PDF, and XML) Thereof 377 with geography defined and 3 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 20 Sep 2020
Publications Copernicus
Download
Short summary
The composition of foraminifera shells often varies with environmental parameters such as temperature or salinity, and can thus be used as proxies. Often a single proxy is being influenced by more than one parameter. Here we show that while salinity impacts shell Na/Ca, temperature has no effect. We also show that the combination of different proxies (Mg/Ca and d18O) to reconstruct salinity does not seem to work as previously thought.
The composition of foraminifera shells often varies with environmental parameters such as...
Citation