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    The influence of salinity on Mg/Ca in planktic foraminifers - evidence from cultures, core-top sediments and complementary δ18O

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    Author's manuscript (882.9Kb)
    Supplemental information (2.019Mb)
    Date
    2013-06
    Author
    Honisch, Barbel  Concept link
    Allen, Katherine A.  Concept link
    Lea, David W.  Concept link
    Spero, Howard J.  Concept link
    Eggins, Stephen M.  Concept link
    Arbuszewski, Jennifer  Concept link
    deMenocal, Peter B.  Concept link
    Rosenthal, Yair  Concept link
    Russell, Ann D.  Concept link
    Elderfield, Henry  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6150
    As published
    https://doi.org/10.1016/j.gca.2013.07.028
    Keyword
     Sea surface temperatures; Mg/Ca; δ18O; Planktic foraminifers; Salinity 
    Abstract
    The Mg/Ca ratio in foraminiferal calcite is one of the principal proxies used for paleoceanographic temperature reconstructions, but recent core-top sediment observations suggest that salinity may exert a significant secondary control on planktic foraminifers. This study compiles new and published laboratory culture experiment data from the planktic foraminifers Orbulina universa, Globigerinoides sacculifer and Globigerinoides ruber, in which salinity was varied but temperature, pH and light were held constant. Combining new data with results from previous culture studies yields a Mg/Ca-sensitivity to salinity of 4.4±2.3%, 4.7±1.2%, and 3.3±1.7% per salinity unit (95% confidence), respectively, for the three foraminifer species studied here. Comparison of these sensitivities with core-top data suggests that the much larger sensitivity (27±4% per salinity unit) derived from Atlantic core-top sediments in previous studies is not a direct effect of salinity. Rather, we suggest that the dissolution correction often applied to Mg/Ca data can lead to significant overestimation of temperatures. We are able to reconcile culture calibrations with core-top observations by combining evidence for seasonal occurrence and latitude-specific habitat depth preferences with corresponding variations in physico-chemical environmental parameters. Although both Mg/Ca and δ18O yield temperature estimates that fall within the bounds of hydrographic observations, discrepancies between the two proxies highlight unresolved challenges with the use of paired Mg/Ca and δ18O analyses to reconstruct paleo-salinity patterns across ocean basins. The first step towards resolving these challenges requires a better spatially and seasonally resolved δ18Osw archive than is currently available. Nonetheless, site-specific reconstructions of salinity change through time may be valid.
    Description
    Author Posting. © The Author(s), 2013. 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 Geochimica et Cosmochimica Acta 121 (2013):196-213, doi:10.1016/j.gca.2013.07.028.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Honisch, Barbel, Allen, Katherine A., Lea, David W., Spero, Howard J., Eggins, Stephen M., Arbuszewski, Jennifer, deMenocal, Peter B., Rosenthal, Yair, Russell, Ann D., Elderfield, Henry, "The influence of salinity on Mg/Ca in planktic foraminifers - evidence from cultures, core-top sediments and complementary δ18O", 2013-06, https://doi.org/10.1016/j.gca.2013.07.028, https://hdl.handle.net/1912/6150
     

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