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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/39550

Title: Constraints on the applicability of the organic temperature proxies UK'37, TEX86 and LDI in the subpolar region around Iceland
Authors: Rodrigo-Gámiz, Marta
Rampen, W.
Haas, H. de
Baas, M.
Schouten, S.
Sinninghe Damsté, J. S.
Issue Date: 2015
Abstract: Subpolar regions are key areas for studying natural climate variability due to their high sensitivity to rapid environmental changes, particularly through sea surface temperature (SST) variations. Here, we have tested three independent organic temperature proxies (UK'37; TEX86; and the long-chain diol index, LDI) regarding their potential applicability for SST reconstruction in the subpolar region around Iceland. UK'37, TEX86 and TEXL86 temperature estimates from suspended particulate matter showed a substantial discrepancy with instrumental data, while long-chain alkyl diols were below the detection limit at most of the stations. In the northern Iceland Basin, sedimenting particles revealed a seasonality in lipid fluxes, i.e., high fluxes of alkenones and glycerol dialkyl glycerol tetraethers (GDGTs) were measured during late spring and during summer and high fluxes of long-chain alkyl diols during late summer. The flux-weighted average temperature estimates had a significant negative (ca. 2.3 °C for UK'37) and positive (up to 5 °C for TEX86) offset with satellite-derived SSTs and temperature estimates derived from the underlying surface sediment. UK'37 temperature estimates from surface sediments around Iceland correlate well with summer mean sea surface temperatures, while TEX86-derived temperatures correspond with both annual and winter mean 0–200 m temperatures, suggesting a subsurface temperature signal. Anomalous LDI-SST values in surface sediments and low mass flux of 1,13- and 1,15-diols compared to 1,14-diols suggest that Proboscia diatoms are the major sources of long-chain alkyl diols in this area rather than eustigmatophyte algae, and therefore the LDI cannot be applied in this region.
Sponsorship: This work was supported by the Earth and Life Sciences Division of the Netherlands Organization for Scientific Research (NWO-ALW) by a grant (ALW 820.01.013) to J. S. Sinninghe Damsté. The research leading to these results has received funding from the European Research Council (ERC) under the European Union’s Seventh Framework Program (FP7/2007-2013) ERC grant agreement 226600.
Publisher: Copernicus Publications; European Geosciences Union (EGU)
Description: The Supplement related to this article is available online at doi:10.5194/bg-12-6573-2015-supplement.
Keywords: Climate
Sea surface temperature (SST)
Continental margin sediments
Sinking particles
URI: http://hdl.handle.net/10481/39550
ISSN: 1726-4170
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Rodrigo-Gámiz, M.; et al. Constraints on the applicability of the organic temperature proxies UK'37, TEX86 and LDI in the subpolar region around Iceland. Biogeosciences, 12: 6573-6590 (2015). [http://hdl.handle.net/10481/39550]
Appears in Collections:OpenAIRE (Open Access Infrastructure for Research in Europe)
DMP - Artículos

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