Evidence for sea spray effect on oxygen stable isotopes in bone phosphate — Approximation and correction using Gaussian Mixture Model clustering

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Göhring A, Mauder M, Kröger P, Mayr C, von Carnap-Bornheim C, Hilberg V, Grupe G
Zeitschrift: Science of the Total Environment
Jahr der Veröffentlichung: 2019
Band: 673
Seitenbereich: 668-684
ISSN: 0048-9697


Abstract

Palaeobiodiversity research based on stable isotope analysis in coastal environments can be severely hampered by the so-called “sea spray” effect. This effect shifts the isotopic signal of terrestrial individuals towards too marine values. It is commonly agreed upon that sea spray influences sulphur stable isotopes. However, we were able to approximate a remarkable sea spray effect also in carbon and oxygen stable isotopes of bone carbonate previously. In the present study we could approximate a minimum sea spray effect of about 13.9% even present in oxygen isotope values of bone phosphate, which was validated by Gaussian Mixture Model (GMM) clustering. This approximated value is by some magnitudes smaller than the minimum sea spray effect approximated for both δ
13
C
carb
and δ
18
O
carb
, and quite close to the sea spray detected for δ
34
S
coll
in a previous study. It may therefore be interpreted as purer minimum sea spray signal compared to the approximation in bone carbonate. Furthermore, detection of sea spray in δ
18
O
phos
can serve as additional validation of the effect present in bone carbonate, which is more prone to diagenetic alteration compared to bone phosphate. Moreover, the presence of the sea spray effect in both δ
18
O
carb
and δ
18
O
phos
demonstrates that sea spray can be taken up by terrestrial mammals not only via food (δ
18
O
carb
) but also via drinking water (δ
18
O
phos
). Finally, this study once more confirmed that calculation of δ
18
O
phos
from δ
18
O
carb
values using a fixed oxygen isotope spacing (Δδ
18
O) can be highly misleading, especially in coastal environments affected by sea spray.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Mayr, Christoph PD Dr.
Institut für Geographie


Einrichtungen weiterer Autorinnen und Autoren

Ludwig-Maximilians-Universität (LMU)
Stiftung Schleswig-Holsteinische Landesmuseen Schloss Gottorf
Zentrum für Baltische und Skandinavische Archäologie (ZBSA)


Zitierweisen

APA:
Göhring, A., Mauder, M., Kröger, P., Mayr, C., von Carnap-Bornheim, C., Hilberg, V., & Grupe, G. (2019). Evidence for sea spray effect on oxygen stable isotopes in bone phosphate — Approximation and correction using Gaussian Mixture Model clustering. Science of the Total Environment, 673, 668-684. https://dx.doi.org/10.1016/j.scitotenv.2019.04.072

MLA:
Göhring, Andrea, et al. "Evidence for sea spray effect on oxygen stable isotopes in bone phosphate — Approximation and correction using Gaussian Mixture Model clustering." Science of the Total Environment 673 (2019): 668-684.

BibTeX: 

Zuletzt aktualisiert 2019-16-05 um 17:23