Evaluation of long chain 1,14-alkyl diols in marine sediments as indicators for upwelling and temperature

•Long chain alkyl diols occur ubiquitously in marine environments.•Chain length distributions of long chain alkyl 1,14-diols do not correlate with SST.•The degree of saturation of long chain 1,14-alkyl diols do not correlate with SST.•Long chain diol indices do not correlate with upwelling strength....

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Veröffentlicht in:Organic geochemistry 2014-11, Vol.76, p.39-47
Hauptverfasser: Rampen, Sebastiaan W., Willmott, Verónica, Kim, Jung-Hyun, Rodrigo-Gámiz, Marta, Uliana, Eleonora, Mollenhauer, Gesine, Schefuß, Enno, Sinninghe Damsté, Jaap S., Schouten, Stefan
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container_start_page 39
container_title Organic geochemistry
container_volume 76
creator Rampen, Sebastiaan W.
Willmott, Verónica
Kim, Jung-Hyun
Rodrigo-Gámiz, Marta
Uliana, Eleonora
Mollenhauer, Gesine
Schefuß, Enno
Sinninghe Damsté, Jaap S.
Schouten, Stefan
description •Long chain alkyl diols occur ubiquitously in marine environments.•Chain length distributions of long chain alkyl 1,14-diols do not correlate with SST.•The degree of saturation of long chain 1,14-alkyl diols do not correlate with SST.•Long chain diol indices do not correlate with upwelling strength. Long chain alkyl diols form a group of lipids occurring widely in marine environments. Recent studies have suggested several palaeoclimatological applications for proxies based on their distributions, but have also revealed uncertainty about their applicability. Here we evaluate the use of long chain 1,14-alkyl diol indices for reconstruction of temperature and upwelling conditions by comparing index values, obtained from a comprehensive set of marine surface sediments, with environmental factors such as sea surface temperature (SST), salinity and nutrient concentration. Previous studies of cultures indicated a strong effect of temperature on the degree of saturation and the chain length distribution of long chain 1,14-alkyl diols in Proboscia spp., quantified as the diol saturation index (DSI) and diol chain length index (DCI), respectively. However, values of these indices for surface sediments showed no relationship with annual mean SST of the overlying water. It remains unknown as to what determines the DSI, although our data suggest that it may be affected by diagenesis, while the relationship between temperature and DCI may be different for different Proboscia species. In addition, contributions from algae other than Proboscia diatoms may affect both indices, although our data provide no direct evidence for additional long chain 1,14-alkyl diol sources. Two other indices using the abundance of 1,14-diols vs. 1,13-diols and C30 1,15-diols have been applied previously as indicators for upwelling intensity at different locations. The geographical distribution of their values supports the use of 1,14 diols vs. 1,13 diols [C28+C30 1,14-diols]/[(C28+C30 1,13-diols)+(C28+C30 1,14-diols)] as a general indicator for high nutrient or upwelling conditions.
doi_str_mv 10.1016/j.orggeochem.2014.07.012
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subjects Animal and plant ecology
Animal, plant and microbial ecology
Bacillariophyceae
Biological and medical sciences
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Long chain alkyl diols
Marine and continental quaternary
Proboscia
Sea surface temperature index
Sea water ecosystems
Surficial geology
Synecology
Upwelling index
title Evaluation of long chain 1,14-alkyl diols in marine sediments as indicators for upwelling and temperature
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