Climate signals in stable carbon and hydrogen isotopes of lignin methoxy groups from southern German beech trees

0560346 - ÚVGZ 2023 RIV DE eng J - Článek v odborném periodiku
Wieland, A. - Greule, M. - Roemer, P. - Esper, Jan - Keppler, F.
Climate signals in stable carbon and hydrogen isotopes of lignin methoxy groups from southern German beech trees.
Climate of the Past. Roč. 18, č. 8 (2022), s. 1849-1866. ISSN 1814-9324. E-ISSN 1814-9332
Grant CEP: GA MŠMT(CZ) EF16_019/0000797
Výzkumná infrastruktura: CzeCOS III - 90123
Institucionální podpora: RVO:86652079
Klíčová slova: WATER-USE EFFICIENCY * PINUS-SYLVESTRIS * WHOLE WOODRING * RINGDATA * RATIOS * DELTA-C-13 * DISCRIMINATION * CO2 * DENDROCLIMATOLOGY * TEMPERATURES
Obor OECD: Meteorology and atmospheric sciences
Impakt faktor: 4.3, rok: 2022
Způsob publikování: Open access
https://cp.copernicus.org/articles/18/1849/2022/

Stable hydrogen and carbon isotope ratios of wood lignin methoxy groups (delta C-13(LM) and delta H-2(LM) values) have been shown to be reliable proxies of past temperature variations. Previous studies showed that delta H-2(LM) values even work in temperate environments where classical tree-ring width and maximum latewood density measurements are less successful for climate reconstructions. Here, we analyse the annually resolved delta C-13(LM) values from 1916-2015 of four beech trees (Fagus sylvatica) from a temperate site near HohenpeiBenberg in southern Germany and compare these data with regional-to continental-scale climate observations. Initial delta(13)C(LM )values were corrected for the Suess effect (a decrease of delta C-13 in atmospheric CO2) and physiological tree responses to increasing atmospheric CO2 concentrations considering a range of published discrimination factors. The calibration of delta C-13(LM) chronologies against instrumental data reveals the highest correlations with regional summer (r = 0.68) and mean annual temperatures (r = 0.66), as well as previous-year September to current-year August temperatures (r = 0.61), all calculated from 1916-2015 and reaching p < 0.001. Additional calibration trials using detrended delta C-13(LM) values and climate data (to constrain effects of autocorrelation on significance levels) returned r(summer) = 0.46 (p < 0.001), r(annual) = 0.25 (p < 0.05) and r(prev.September-August) = 0.18 (p > 0.05). The new delta C-13(LM) chronologies were finally compared with the previously produced delta H-2(LM) values of the same trees in order to evaluate the additional gain of assessing past climate variability using a dual-isotope approach. Compared to delta C-13(LM), delta H-2(LM) values correlate substantially more strongly with large-scale temperatures averaged over western Europe (r(prev.September-August) = 0.69), whereas only weak and mainly insignificant correlations are obtained between precipitation and both isotope chronologies (delta C-13(LM) and delta H-2(LM) values). Our results indicate the great potential of using delta C-13(LM) values from temperate environments as a proxy for local temperatures and, in combination with delta H-2(LM) values, to assess regional- to sub-continental scale temperature patterns.
Trvalý link: https://hdl.handle.net/11104/0333295