A5019679896- Tree-ring climate responses
- Geology and Paleoclimatology Research
- Plant Water Relations and Carbon Dynamics
- Archaeology and ancient environmental studies
- Climate variability and models
- Lichen and fungal ecology
- Astro and Planetary Science
- Landslides and related hazards
- Groundwater and Isotope Geochemistry
- Ecology and Vegetation Dynamics Studies
- Cultural Heritage Materials Analysis
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- Mediterranean and Iberian flora and fauna
- Healthcare Systems and Challenges
- Clinical Nutrition and Gastroenterology
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies Worldwide
- Climate change and permafrost
- Aeolian processes and effects
University of Cambridge
2022-2025
Oeschger Centre for Climate Change Research
2020-2025
University of Bern
2020-2025
University of Milano-Bicocca
2021
The high temperature sensitivity of pine trees in northern Fennoscandia has led to some the most reliable tree-ring climate reconstructions world for past millennia. However, wood anatomical anomalies that likely reflect temperature-induced reductions cell wall lignification, so-called Blue Rings (BRs), have not yet been systematically investigated and shrubs Europe. Here, we present frontier research on occurrence BRs Pinus sylvestris Juniperus communis (L) s.l. from upper treeline Norway...
Abstract Heatwaves and summer droughts across Europe are likely to intensify under anthropogenic global warming thereby affecting ecological societal systems. To place modern trends extremes in the context of past natural variability, annually resolved absolutely dated climate reconstructions needed. Here, we present a network 153 yew ( Taxus baccata L.) tree-ring width (TRW) series from 22 sites southern England that cover 310 years. Significant positive correlations were found between TRW...
Contextualising anthropogenic warming and investigating linkages between past climate variability human history require high-resolution temperature reconstructions that extend before the period of instrumental measurements. Here, we present maximum latewood density (MXD) measurements 534 living relict Pinus uncinata trees from undisturbed upper treeline ecotones in Spanish central Pyrenees. Spanning 1119–2020 CE continuously, our new MXD composite chronology correlates significantly with...
Perennially frozen soil, also known as permafrost, is important for the functioning and productivity of most boreal forest, world's largest terrestrial biome. A better understanding complex vegetation-permafrost interrelationships needed to predict changes in local- large-scale carbon, nutrient, water cycle dynamics under future global warming. Here, we analyze tree-ring width stable isotope (C O) measurements Gmelin larch (Larix gmelinii (Rupr.) Rupr.) from six permafrost sites northern...
Radial tree growth at high-elevation and high-latitude sites is predominantly controlled by changes in summer temperature. This relationship is, however, expected to weaken under projected global warming, which questions the reliability of tree-ring chronologies for climate reconstructions. Here, we examined growth–climate response patterns five width (TRW) maximum latewood density (MXD) larch (Larix sibirica) from upper-treeline ecotones Altai Mountains, a key region developing...
Placing current climate trends and extremes in the long-term context of pre-industrial variability requires annually resolved absolutely dated proxy archives.Here, we benefit from hundreds exceptionally well-preserved subfossil yew (Taxus baccata) trees that were excavated over decades near sea-level peat-rich sediments Fenland region eastern England. We combined dendrochronological radiocarbon dating to develop a millennium-long tree-ring width (TRW) chronology for mid-Holocene. further...
The dual nature of tree-ring cellulose hydrogen isotope composition (δ²H) as a hydroclimatic and physiological proxy offers unique opportunities for palaeoclimatic research (Vitali et al. 2022, 2023), yet its application in long-term studies remains limited. Building on recent advances stable research, we analyse the Alpine Holocene Tree-Ring Triple Isotope Record (AHTTRIR, Arosio 2022), comprehensive dataset spanning 9,000 years δ²H,...
Abstract Tree ring‐based climate reconstructions are fundamental for high‐resolution paleoclimatology, but only a few of them extend back into the mid‐Holocene (8,200–4,200 years BP). Here, we present annually‐resolved tree‐ring stable carbon and oxygen isotopes (δ 13 C δ 18 O) from subfossil yew ( Taxus baccata ) wood excavated in Fenland region eastern England. We develop an eco‐physiological model to reconstruct hydroclimate variability 5,224 4,813 ± 4 4,612–4,195 6 cal. BP. Our findings...
Here, we use 7437 stable oxygen (δ 18 O) isotope ratios extracted from 192 living and relict Alpine trees to reconstruct trends extremes in European summer hydroclimate 8980 before the present 2014 Common Era. Our continuous tree-ring δ O record reveals a significant long-term drying trend over much of Holocene ( P < 0.001), which is line with orbital forcing independent evidence proxy reconstructions model simulations. Wetter conditions early-to-mid coincide African Humid Period, whereas...
Introduction The Global Meteoric Water Line (GMWL) describes the linear relationship between stable hydrogen ( δ 2 H) and oxygen 18 O) isotopes in precipitation over large spatial scales therefore represents a unique reference for water isotopic values. Although trees have potential to capture composition of precipitation, it remains unclear if GMWL can be reconstructed from tree-ring isotopes, since O H undergo vivo physiological fractionation. Methods We analyze tree rings values six...
The analysis of the stable isotope tree-ring cellulose is an important tool for paleo climatic investigations. Long chronologies consist predominantly oaks and conifers in Europe, including larch trees ( Larix decidua ) cembran pines Pinus cembra that form very long tree ring Alps grow at treeline, where growth mainly determined by temperature variations. We analyzed δ 13 C, 18 O 2 H isotopes extracted from tree-rings wood samples collected high altitude Swiss Tyrol Alps, covering whole...
Abstract. Stable isotopes in tree-ring cellulose are important tools for climatic reconstructions even though their interpretation could be challenging due to nonclimate signals, primarily those related tree aging. Previous studies on the presence of tree-age-related trends during juvenile as well adult growth phases δD, δ18O, and δ13C time series yielded variable results that not coherent among different plant species. We analyzed possible extracted rings 85 larch trees 119 cembran pine...
Tree-ring chronologies form the backbone of high-resolution palaeoclimatology. However, their number declines drastically prior to medieval times, and only a few such records worldwide extend back mid-Holocene. Here, we present collection more than 400 subfossil yew (Taxus baccata L.) trees excavated from near sea-level peat-rich sediments in Fenland region eastern England. The well-preserved trunks are between two eight metres long, often exhibit adventitious root layers, contain up rings...
Subject to a long research tradition, the tree line is considered an important biogeographic indicator of climate changes and associated range shifts. Realized positions potential isotherm are, however, rarely in equilibrium because trees are unable track rapid temperature variations. Often ignored research, this dilemma constrains suitability for understanding alpine vegetation responses anthropogenic warming. Here, we present combined dendrochronological wood anatomical assessments 1,351...
Tree-ring stable isotopes are typically measured in latewood cellulose to mitigate potential carry-over effects from previous year storage pools. The isotopic composition of individual tree-ring segments is thought include considerable intra-annual variability. This sampling strategy may be complicated by steep isotope gradients that can rival the inter-annual variability, however. Consistent material not always possible due low sample availability or high prevalence narrow rings amounts...
Age-related trends are present in tree-ring widths (TRW), but their presence tree rings isotope is debated. It unclear how cambial age influences the relationships between TRW and isotopes. Tree-ring isotopes of alpine larch cembran-pine trees showed only juvenile period (>100 years), which might mask inter-relations proxies during age. This work tries to unmask age-trend by examining correlations TRW—stable with without correction. The non-detrended linear-detrended values TRW, δD δ18O...
It has recently been argued that tree-ring stable isotopes (TRSI) can reveal persistent long-term hydroclimate trends are usually not captured by more traditional dendroclimatic studies using width or density (B&#252;ntgen 2022). Since the putative discrepancy between &#8216;growth-dependent&#8217; ring and versus &#8216;growth-independent&#8217; TRSI proxies is likely unrelated to biases from age-trend removal et al. 2021; Yang 2021), we propose a re-evaluation of...
The importance of the stable isotopes in tree rings for study climate variations caused by volcanic eruptions is still unclear. We studied δ18O, δD, δ13C larch and cembran pine cellulose around four major with annual resolution, along a superposed epoch analysis 34 5-year resolution. Initial tropical Tambora (1815 CE) Samalas (1257 showed post-eruption decrease δ18O values attributed to post-volcanic cooling increased summer precipitation Southern Europe, as documented observations...
Abstract. A recent analysis of stable isotopes the Alpine Holocene Tree-Ring Dataset, consisting samples from 192 larch and cembran pine trees, revealed that δD δ18O exhibit no trends in adult but evidence juvenile period first 100 years cambial age. In this work we applied Spearman statistical on different age classes to verify if these changes were correlated with tree-ring width values, are known show trends. The results prove a significant correlation between tree-ring-width (TRW) both...
Abstract Understanding the recent events marking late Quaternary history of Po Plain (N-Italy) is overriding importance to decipher record depositional versus erosional phases, and their interplay with climatic, tectonic, human forcing. We reconstructed structural setting chronostratigraphy a Holocene succession crosscut by thrust fault located south Montodine (Cremona, Italy) within Plain. The shows maximum displacement up one meter. Radiocarbon dating fixes minimum age 11.9 cal ka BP for...
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