期刊
GEOCHIMICA ET COSMOCHIMICA ACTA
卷 84, 期 -, 页码 204-216出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.gca.2012.01.024
关键词
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资金
- VICI from the Earth and Life Sciences Division of the Netherlands Organization for Scientific Research (NWO-ALW)
- European Research Council under the European Union [226600]
- Spinoza prize
Although commonly reported in marine and freshwater environments, little is known about the biological sources of long chain alkyl 1,13- and 1,15-diols, and factors controlling their distributions. Here we analyzed the occurrence and distribution of these lipids in a comprehensive set of marine surface sediments and compare their distributions with environmental conditions like sea surface temperature (SST), salinity and nutrient concentrations. Fractional abundances of the C-28 1,13-, C-30 1,13- and C-30 1,15-diols show a strong correlation with SST and based on these results, we propose the Long chain Diol Index (LDI), which expresses the C-30 1,15-diol abundance relative to those of C-28 1,13-, C-30 1,13- and C-30 1,15-diols. The LDI shows a strong linear correlation with SST (LDI = 0.033 x SST + 0.095; R-2 = 0.969, n = 162) over a temperature range of -3 to 27 degrees C. Long chain diol distributions in sediments from the South Atlantic close to the Congo River outflow (West Africa) provided a 43 kyr LDI SST record. This record reflects several known climatic events and shows similarities with an alke-none-derived SST record obtained using the same suite of sediments, both in trend and in terms of absolute SST. This confirms the potential of the LDI as a proxy for palaeo-SST reconstruction. (c) 2012 Elsevier Ltd. All rights reserved.
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