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Eolian transport of glycerol dialkyl glycerol tetraethers (GDGTs) off northwest Africa

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https://ir.library.oregonstate.edu/concern/articles/9z9034927

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  • Branched glycerol dialkyl glycerol tetraethers (brGDGTs) of purportedly terrestrial origin are frequently detected in marine sediments, even in remote ocean sites where no direct impact from land erosion via rivers takes place. At these places, the most likely explanation for the presence of brGDGTs is in situ production or eolian transport, but neither possibility has been demonstrated for the open ocean. Here, we report the presence of isoprenoid (iso) and brGDGTs in eight dust samples collected off Northwest Africa. Based on previous studies, prevailing wind patterns, bulk chemistry, n-alkane composition and isotopic signatures, we show that Northwest Africa is the likely principal origin of the GDGTs in the dust. The concentrations of plant wax n-alkanes in the dust are several orders of magnitude higher than those of GDGTs and, based on the distributions of these two compound classes, we infer that they tag different carbon pools and sources of organic matter. Our finding demonstrates that brGDGTs and isoGDGTs in marine sediments and wind-derived deposits can have an eolian source. Consequently, climate reconstruction may be attempted from wind-derived deposits of brGDGTs, even in remote oceanic areas.
  • Keywords: n-alkanes, mean annual air temperature (MAAT), eolian dust, soil organic material, isotopic signature, GDGTs, allochthonous input
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  • Fietz, S., Prahl, F. G., Moraleda, N., & Rosell-Melé, A. (2013). Eolian transport of glycerol dialkyl glycerol tetraethers (GDGTs) off Northwest Africa. Organic Geochemistry, 64, 112-118. doi:10.1016/j.orggeochem.2013.09.009
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  • 64
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  • The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for provision of the HYSPLIT transport and dispersion model and/or READY website (http://ready.arl.noaa.gov). S.F.thanks the Spanish Ministerio de Ciencia e Innovación for a Juan de la Cierva fellowship. A.R.M.acknowledges funding support from the European Commission (Marie Curie-IOF, 235626; andPast4Future projects 243908) and Spanish Ministerio de Economía y Competitividad (CTM2009-12214).F.P. thanks the U.S. National Science Foundation (OCE-961685) for prior support that ultimately benefited the work.
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