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

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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 in 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 magnitudes 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.
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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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  • description.provenance : Made available in DSpace on 2014-01-29T19:39:22Z (GMT). No. of bitstreams: 1 PrahlFredrickCEOASEolianTransportGlycerol.pdf: 1567946 bytes, checksum: a50dc57fda4fb224099327ca29ee0d3b (MD5) Previous issue date: 2013-11
  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2014-01-29T19:39:22Z No. of bitstreams: 1 PrahlFredrickCEOASEolianTransportGlycerol.pdf: 1567946 bytes, checksum: a50dc57fda4fb224099327ca29ee0d3b (MD5)
  • Vol. 64 (2013)
  • Organic Geochemistry

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