Long chain 1,13-and 1,15-diols as a potential proxy for palaeotemperature reconstruction
Rampen, S.W.; Willmott, V.; Kim, J.H.; Uliana, E.; Mollenhauer, G.; Schefuss, E.; Sinninghe Damsté, J.S.; Schouten, S. (2012). Long chain 1,13-and 1,15-diols as a potential proxy for palaeotemperature reconstruction. Geochim. Cosmochim. Acta 84: 204-216. dx.doi.org/10.1016/j.gca.2012.01.024
In: Geochimica et Cosmochimica Acta. Elsevier: Oxford,New York etc.. ISSN 0016-7037; e-ISSN 1872-9533, meer
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| Auteurs | | Top |
- Rampen, S.W., meer
- Willmott, V.
- Kim, J.H., meer
- Uliana, E.
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- Mollenhauer, G.
- Schefuss, E.
- Sinninghe Damsté, J.S., meer
- Schouten, S., meer
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| Abstract |
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. |
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