dc.contributor.author
Gaviria-Lugo, Nestor
dc.contributor.author
Läuchli, Charlotte
dc.contributor.author
Wittmann, Hella
dc.contributor.author
Bernhard, Anne
dc.contributor.author
Frings, Patrick
dc.contributor.author
Mohtadi, Mahyar
dc.contributor.author
Rach, Oliver
dc.contributor.author
Sachse, Dirk
dc.date.accessioned
2023-11-14T07:46:01Z
dc.date.available
2023-11-14T07:46:01Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/41499
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-41221
dc.description.abstract
The hydrogen isotope composition of leaf wax biomarkers (δ2Hwax) is a valuable tool for reconstructing continental paleohydrology, since it serves as a proxy for the hydrogen isotope composition of precipitation (δ2Hpre). To yield robust palaeohydrological reconstructions using δ2Hwax in marine archives, it is necessary to examine the impacts of regional climate on δ2Hwax and assess the similarity between marine sedimentary δ2Hwax and the source of continental δ2Hwax. Here, we examined an aridity gradient from hyperarid to humid along the Chilean coast. We sampled sediments at the outlets of rivers draining into the Pacific as well as soils within catchments and marine surface sediments adjacent to the outlets of the studied rivers and analyzed the relationship between climatic variables and δ2Hwax values. We found that apparent fractionation between leaf waxes and source water is relatively constant in humid and semiarid regions (average: −121 ‰). However, it becomes less negative in hyperarid regions (average: −86 ‰) as a result of evapotranspirative processes affecting soil and leaf water 2H enrichment.
We also observed that along strong aridity gradients, the 2H enrichment of δ2Hwax follows a non-linear relationship with water content and water flux variables, driven by strong soil evaporation and plant transpiration. Furthermore, our results indicate that δ2Hwax values in marine surface sediments largely reflect δ2Hwax values from the continent, confirming the robustness of marine δ2Hwax records for paleohydrological reconstructions along the Chilean margin. These findings also highlight the importance of considering the effects of hyperaridity in the interpretation of δ2Hwax values and pave the way for more quantitative paleohydrological reconstructions using δ2Hwax.
en
dc.format.extent
21 Seiten
dc.rights
This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
climatic controls
en
dc.subject
leaf wax hydrogen isotope ratios
en
dc.subject
terrestrial and marine sediments
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften
dc.title
Climatic controls on leaf wax hydrogen isotope ratios in terrestrial and marine sediments along a hyperarid-to-humid gradient
dc.type
Wissenschaftlicher Artikel
dc.date.updated
2023-11-08T15:24:13Z
dcterms.bibliographicCitation.doi
10.5194/bg-20-4433-2023
dcterms.bibliographicCitation.journaltitle
Biogeosciences
dcterms.bibliographicCitation.number
21
dcterms.bibliographicCitation.pagestart
4433
dcterms.bibliographicCitation.pageend
4453
dcterms.bibliographicCitation.volume
20
dcterms.bibliographicCitation.url
https://doi.org/10.5194/bg-20-4433-2023
refubium.affiliation
Geowissenschaften
refubium.affiliation.other
Institut für Geologische Wissenschaften / Fachrichtung Tektonik und Sedimentäre Systeme
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
1726-4189
refubium.resourceType.provider
DeepGreen