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| Titel |
Exploring tree age-related trends in δ13C and δ18O data from North Scandinavia over the last millennium |
| VerfasserIn |
Claudia Hartl-Meier, Kerstin Treydte, Bernd Schöne, Michael Maus, Jan Esper |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250146334
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| Publikation (Nr.) |
 EGU/EGU2017-10356.pdf |
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| Zusammenfassung |
| Stable isotope chronologies from tree-rings are increasingly used as estimators
for past environmental changes. It is, however, still not fully understood whether
trend biases in dendroisotope data are restricted to “juvenile effects” or additional
long-term trends associated with tree age are inherent to long carbon (δ13C) and
oxygen (δ18O) chronologies. We here develop a new millennium-long chronology
from decadally resolved δ13C and δ18O measurements from 70 living and subfossil
pine (Pinus sylvestris L.) trees from northern Scandinavia. Our dataset benefits
from a consistently high replication of more than five series since 941 AD until
present for both δ13C and δ18O. Preliminary results reveal a positive trend in δ13C
over the first 150 years of cambial tree age, while a comparable trend is absent in
δ18O. Further analyses will focus on time dependent trends, i.e. environmentally
induced changes, over the last millennium. The additional availability of tree-ring
width and maximum latewood density measurements from the same trees allows a
comprehensive evaluation of parameter specific trends, biases and environmental signals. |
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