Modeling the contribution of carbon sources using cellulose 14C concentrations in subannual tree ring increments over the 1963 bomb spike

Datos Bibliográficos

ID6447964
AutoresHelene Løvstrand Svarva (0000-0001-8501-4767, Norwegian University of Science and Technology, autor de correspondencia), Pieter M Grootes (0000-0003-4265-3168, Norwegian University of Science and Technology), Martin Seiler (0000-0003-4267-0478, Norwegian University of Science and Technology), Marie‐josée Nadeau (0000-0001-9616-5632, Norwegian University of Science and Technology)
Año2025
Volumen67
Número4
Páginas831-841
Fecha de publicación2025-07-04
Peer ReviewedSí
Open AccessSí
TipoARTICLE
RevistaRadiocarbon (JOURNAL)
Identificadores de la revistaISSN: 0033-8222 • E-ISSN: 1945-5755
EditorialCambridge University Press (CUP) (PUBLISHER)
DOI10.1017/rdc.2025.10102
OpenAlexW4412016551
IdiomaEN
Referencias citadas25

Measurements of the radiocarbon ( 14 C) content of subannual wood cellulose samples over the 1963 bomb spike have revealed an apparent delay between the increase in atmospheric radiocarbon content and that of wood cellulose. This delay is apparent in both coniferous and deciduous tree species and is of a magnitude of approximately 4 weeks. The delay in wood cellulose 14 C change as measured in a Sitka spruce from Washington state, USA, was previously used to estimate the relative influence of tree physiological effects contra environmental effects. We repeated the measurements with the increased measurement precision of today’s AMS systems and compare the new results to the ones of a Scots pine tree from Trondheim, central Norway and a white oak from Oregon state, USA. The results challenge the assumption that the 14 C tree ring records directly show the atmospheric 14 C concentration of a homogeneous, zonally well-mixed atmosphere. Instead, the apparent 1963 delay reflects local influences of the ecosystem and tree physiology. The 1963/1964 data allows for exploratory modeling of the effects of biospheric decay CO 2 and local environmental influences assuming the absence of stored photosynthates from the previous year. Compared to the 10–30% contribution from biospheric CO 2 , the effects of delayed incorporation of carbon into the wood cellulose and the effect of stored photosynthate are small in the conifers. Highly detailed 14 C records of stem cellulose can, in combination with stable isotope studies, contribute to our understanding of variability of the local carbon cycle, climate, and the environment

Carbon fibers · Carbon-14 · Cellulose · Dendrochronology · Nuclear physics · Physics · Radiocarbon dating · Radiochemistry · Ring (chemistry · Spike (software development · Chemistry · Engineering · Geology and Paleoclimatology Research · Materials Science · Plant Water Relations and Carbon Dynamics · Tree-ring climate responses · Geology · Organic Chemistry · Paleontology