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Seasonality of U[superscript K’]₃₇ temperature estimates as inferred from sediment trap data

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Abstract
  • The seasonality of sea surface temperatures (SST) estimated from the alkenone-U[superscript K’]₃₇ index has been a debated issue since the development of the sediment trap time series data from 34 sampling locations, we show that the maximum alkenone flux in sediment traps varies markedly across the oceans, only on latitude and light availability but also on local oceanographic conditions. The seasonality of the alkenone flux to sediments may also be shaped by the complexity sedimentation processes and a consistent, globally applicable, seasonal pattern is apparent. Nevertheless, U[superscript K’]₃₇ values display a world ocean scale annual SSTs (0 m) that closely resembles the standard calibration equation now for modern surface sediment records. Thus, with a few notable exceptions at locations proximate to major hydrographic fronts, it can be concluded that the sedimentation patterns for U[superscript K’]₃₇ measured in sediment trap time series provide a measure of annual mean SST.
  • KEYWORDS: Sea surface temperature, Seasonality, U[superscript K’]₃₇, Sediment trap, Alkenone
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  • Rosell-Mele, A., & Prahl, F. G. (2013). Seasonality of U-37(K)' temperature estimates as inferred from sediment trap data. Quaternary Science Reviews, 72, 128-136. doi:10.1016/j.quascirev.2013.04.017
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  • 72
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  • Support for this work was provided with funding to A.R.M. by the European Commission (Marie Curie-IOF, 235626; and P4F project 243908) and to F.G.P. by the U.S. National Science Foundation (OCE-1103434 and 1204204).
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