Abstract ID: 3.11660 | Accepted as Talk | Talk/Oral | TBA | TBA

Stable carbon isotope (δ¹³C) chronologies from tree rings are valuable proxies for reconstructing past climatic and environmental conditions. This study compares two site-specific δ¹³C chronologies of Abies spectabilis from the eastern and central Nepal Himalayas. We examine their coherence, variability, and climatic sensitivity to assess regional differences in the physiological responses of trees to environmental factors. We examined the influence of temperature, precipitation, and atmospheric CO₂ concentration on carbon assimilation processes by analysing isotopic trends over multiple decades. Our results reveal site-specific differences in δ¹³C signatures, likely influenced by local climatic regimes, elevation, and micro-environmental conditions. This study helps to better understand the spatial variability of δ¹³C chronologies in the Himalayas, with implications for climate reconstructions and assessing tree physiological responses to ongoing climatic changes.