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Alkenone distribution impacts the hydrogen isotopic composition of the C37:2 and C37:3 alkan-2-ones in Emiliania huxleyi
van der Meer, M.T.J.; Benthien, A.; Bijma, J.; Schouten, S.; Sinninghe Damsté, J.S. (2013). Alkenone distribution impacts the hydrogen isotopic composition of the C37:2 and C37:3 alkan-2-ones in Emiliania huxleyi. Geochim. Cosmochim. Acta 111: 162-166. dx.doi.org/10.1016/j.gca.2012.10.041
In: Geochimica et Cosmochimica Acta. Elsevier: Oxford,New York etc.. ISSN 0016-7037; e-ISSN 1872-9533, meer
Peer reviewed article  
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  • van der Meer, M.T.J., meer
  • Benthien, A.
  • Bijma, J., meer
  • Schouten, S., meer
  • Sinninghe Damsté, J.S., meer
Abstract
    The hydrogen isotopic composition (delta D) of long-chain alkenones derived from haptophyte algae has recently been applied as paleo sea surface salinity proxy, but this application has been complicated by reported differences in delta D of individual C-37 alkenones of up to 45 parts per thousand. Here we show that this difference in D/H ratios is the result of the desaturation of the C-37:2 alkenone to form the C-37:3 alkenone and related to the relative abundance of the individual alkenones, and, therefore, the U-37(K)'. For the purpose of reconstructing paleo sea surface salinities it is recommended to determine the delta D of combined rather than individual C-37 alkenones.
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