Investigating Masking Effects of Age Trends on the Correlations among Tree Ring Proxies

Abstract

Age-related trends are present in tree-ring widths (TRW), but their presence in tree rings isotope is debated. It is unclear how cambial age influences the relationships between TRW and isotopes. Tree-ring isotopes of alpine larch and cembran-pine trees showed only trends in the juvenile period (>100 years), which might mask the inter-relations between tree-ring proxies during cambial age. This work tries to unmask the age-trend influences by examining the correlations in TRW—stable isotopes with and without age-trend correction. The non-detrended and linear-detrended values of TRW, of δD and δ18O showed significant correlations for ages up to 100 years, but not afterward. However, the correlation values, after spline or first-difference time-series detrending, were not age-related. Thus, detrending methods affect the correlations in the juvenile phase and may affect climate-related interpretations. The correlations between TRW and δ13C were not age-related, while those among the isotopes were significant throughout the ages. The correlation between δ13C and δD was the exception, as it became significant only after age > 100 years, suggesting a different use of reserves in the juvenile phase. In conclusion, the relationships among the tree-ring parameters are stable in all the different detrend scenarios after the juvenile phase, and they can be used together in multi-proxy paleoclimatic studies. The data of the juvenile phase can be used after spline-detrending or first-difference time-series calculation, depending on the purpose of the analysis to remove age-related trends. The work also provides clues on the possible causes of juvenile age trends.

Variable Response in Alpine Tree-Ring Stable Isotopes Following Volcanic Eruptions in the Tropics and Iceland

“…This difference may be attributed to the strong post-eruption cooling that caused lower δD values of precipitation, which was more represented in the cembran pine than in the larch. In a previous work, we found that larch showed a higher correlation between oxygen and hydrogen isotope data than cembran pine [82]. We attributed the strongest signal in the cellulose δ 18 O to the impact of both temperature and precipitation, since the tropical eruptions not only have a cooling effect but also produce circulation feedbacks at a continental scale that cause distinct effects on regional precipitation patterns [9].…”

Anthropogenic Impact on the Components of the Forest Ecosystem: On the Example of the Bayanaul State National Natural Park

“…The selection of core samples for calculating the annual growth of wood was carried out according to the standard method adopted in dendrochronology. Cameral processing of the obtained material and core counting were carried out on a semi-automatic LinTab 6 installation with TsapWin software [11,12]. The content of chemical elements of these soils was determined using an atomic emission spectrometer with inductively coupled plasma SPECTRO ARCOS (Germany).…”

Climate impacts on tree-ring stable isotopes across the Northern Hemispheric boreal zone

“…The use of hydrogen isotopes (δ 2 H) in precipitation samples have been studied at a global scale and broadly correlate with mean global temperature (Dansgaard, 1964;Konecky et al, 2020). However, only few studies have examined the potential use δ 2 H in tree rings as a paleoenvironmental proxy (Roden et al, 2000;Hilasvuori, 2011;Voelker et al, 2014;Kimak and Leuenberger, 2015;Arosio et al, 2021;Lehmann et al, 2021;Schuler et al, 2022;Churakova Sidorova et al, 2022a). Recent studies showed that δ 2 H in tree-ring cellulose (δ 2 H trc ) is more than a temperature proxy and can contain information about biochemical processes related to photosynthesis and ecohydrological changes (Lehmann et al, 2021;Schuler et al, 2022).…”