Influence of water availability in the distributions of branched glycerol dialkyl glycerol tetraether in soils of the Iberian Peninsula

Simple item page
dc.contributor.authorMenges, J.en_ZA
dc.contributor.authorHuguet, C.en_ZA
dc.contributor.authorAlcaniz, J. M.en_ZA
dc.contributor.authorFietz, S.en_ZA
dc.contributor.authorSachse, D.en_ZA
dc.contributor.authorRosell-Mele, A.en_ZA
dc.date.accessioned2016-04-26T13:39:15Z
dc.date.available2016-04-26T13:39:15Z
dc.date.issued2014
dc.descriptionCITATION: Menges, J. et al. 2014. Influence of water availability in the distributions of branched glycerol dialkyl glycerol tetraether in soils of the Iberian Peninsula. Biogeosciences, 11:2571-2581, doi:10.5194/bg-11-2571-2014.en_ZA
dc.descriptionThe original publication is available at http://www.biogeosciences.neten_ZA
dc.description.abstractThe combined application of the MBT (degree of methylation) and CBT (degree of cyclization) indices, based on the distribution of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in soils, has been proposed as a paleoproxy to estimate mean annual temperature (MAT). CBT quantifies the degree of cyclization of brGDGTs and relates to soil pH. MBT and the simplified version MBT' quantify the degree of methylation of brGDGTs and relate to MAT and soil pH. However, other factors such as soil water availability have also been suggested to influence MBT' and possibly restrict the combined application of the MBT' and CBT indices as a paleotemperature proxy. To assess the effect of hydrological conditions on MBT' and CBT, a set of 23 Iberian Peninsula soil samples, covering a MAT range from 10 to 18 °C and a mean annual precipitation (MAP) range of 405 mm to 1455 mm, was analyzed. We found that the CBT was indeed significantly correlated with soil pH in our sample set. In contrast, MBT' was not correlated with MAT but had a significant correlation with the aridity index (AI), a parameter related to water availability in soils. The AI can explain 50% of the variation of the MBT', and 70% of the residuals of MAT estimated with the MBT/CBT proxy as compared to instrumentally measured MAT. We propose that, in arid settings, where water may be an ecologically limiting factor, MBT' is influenced by hydrological conditions rather than temperature. Thus, our results suggest that the combination of MBT' and CBT indices should be applied with caution in paleotemperature reconstructions in soils from dry subhumid to hyperarid environments.en_ZA
dc.description.urihttp://www.biogeosciences.net/11/2571/2014/bg-11-2571-2014.html
dc.description.versionPublisher's versionen_ZA
dc.format.extent11 pages : illustrationsen_ZA
dc.identifier.citationMenges, J. et al. 2014. Influence of water availability in the distributions of branched glycerol dialkyl glycerol tetraether in soils of the Iberian Peninsula. Biogeosciences, 11:2571-2581, doi:10.5194/bg-11-2571-2014.en_ZA
dc.identifier.issn1726-4189 (online)
dc.identifier.otherdoi:10.5194/bg-11-2571-2014
dc.identifier.urihttp://hdl.handle.net/10019.1/98948
dc.language.isoen_ZAen_ZA
dc.publisherEuropean Geosciences Unionen_ZA
dc.rights.holderAuthors retain copyrighten_ZA
dc.subjectWater availability -- Iberian Peninsulaen_ZA
dc.subjectSoils -- Iberian Peninsulaen_ZA
dc.subjectIberian Peninsula -- Climatizationen_ZA
dc.titleInfluence of water availability in the distributions of branched glycerol dialkyl glycerol tetraether in soils of the Iberian Peninsulaen_ZA
dc.typeArticleen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
menges_influence_2014.pdf
Size:
1010.76 KB
Format:
Adobe Portable Document Format
Description:
Download article
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.95 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Research Articles (Earth Sciences)