A5030206505- Tree-ring climate responses
- Plant Water Relations and Carbon Dynamics
- Geology and Paleoclimatology Research
- Ecology and Vegetation Dynamics Studies
- Forest ecology and management
- Climate variability and models
- Cryospheric studies and observations
- Tree Root and Stability Studies
- Hydrology and Drought Analysis
- Climate change and permafrost
- Botany and Plant Ecology Studies
- Horticultural and Viticultural Research
- Conservation, Biodiversity, and Resource Management
- Species Distribution and Climate Change
- Land Use and Ecosystem Services
- Plant responses to elevated CO2
- Meteorological Phenomena and Simulations
- Fire effects on ecosystems
- Landslides and related hazards
- Rangeland Management and Livestock Ecology
- Archaeology and ancient environmental studies
- Remote Sensing in Agriculture
- Agroforestry and silvopastoral systems
- Land Rights and Reforms
- Environmental and Cultural Studies in Latin America and Beyond
Friedrich-Alexander-Universität Erlangen-Nürnberg
2016-2025
V. B. Sochava Institute of Geography
2006-2025
Bayer (Germany)
2023
Schiller International University
2012
University of Stuttgart
1999-2006
Abstract The Modjo watershed has experienced significant land use/land cover (LULC) change and soil erosion. This study examines changes in surface runoff generation erosion response to the LULC dynamics. To simulate sediment yield, geographic information system‐interfaced Soil Water Assessment Tool (SWAT) model was used. Model sensitivity, calibration validation analyses were carried out, efficiency of evaluated using simulated measured discharge data. two scenario simulation...
Phenological responses of vegetation to climate, in particular the ongoing warming trend, have received much attention. However, divergent results from analyses remote sensing data been obtained for Tibetan Plateau (TP), world's largest high-elevation region. This study provides a perspective on phenology shifts during 1960-2014, gained using an innovative approach based well-validated, process-based, tree-ring growth model that is independent temporal changes technical properties and image...
Asian summer monsoon (ASM) variability and its long-term ecological societal impacts extending back to Neolithic times are poorly understood due a lack of high-resolution climate proxy data. Here, we present precisely dated well-calibrated tree-ring stable isotope chronology from the Tibetan Plateau with 1- 5-y resolution that reflects high- low-frequency ASM 4680 BCE 2011 CE. Superimposed on persistent drying trend since mid-Holocene, rapid decrease in moisture availability between ∼2000...
Abstract Tree-ring chronologies underpin the majority of annually-resolved reconstructions Common Era climate. However, they are derived using different datasets and techniques, ramifications which have hitherto been little explored. Here, we report results a double-blind experiment that yielded 15 Northern Hemisphere summer temperature from common network regional tree-ring width datasets. Taken together as an ensemble, reconstruction mean correlates with instrumental temperatures 1794–2016...
Global circulation models predict an increase of summer monsoon precipitation in High Asia as a consequence global warming. The shortness available meteorological records requires the reconstruction past climate variability. However, high‐resolution proxy from Tibetan plateau are scarce and limited spatial representativeness. Here we present first evidence increased intensity based on reconstructions late (August September) temperature rainfall network 22 maximum latewood density (MLD)...
Though tree-ring chronologies are annually resolved, their dating has never been independently validated at the global scale. Moreover, it is unknown if atmospheric radiocarbon enrichment events of cosmogenic origin leave spatiotemporally consistent fingerprints. Here we measure 14C content in 484 individual tree rings formed periods 770-780 and 990-1000 CE. Distinct excursions starting boreal summer 774 spring 993 ensure precise 44 records from five continents. We also identify a meridional...
Intra-annual density fluctuations (IADFs) in tree rings are generally considered structural anomalies caused by deviations from the “normal course” of xylogenesis during growing season. This definition is based on bias that, under conditions”, cambial activity stops once a year. Each ring can thus be dated to one calendar year, which principles dendrochronology. The formation IADFs triggered directly environmental changes, especially precipitation and temperature, that affect cell...
Abstract. The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these account for more assimilation and storage than any other terrestrial ecosystem. Based on a unique combination pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements 35 litter measurements), their associated canopy photosynthetic capacity (enhanced vegetation index, EVI) climate, we ask how allocation are related to seasonality...
Abstract Monthly mean (TEM), maximum ( T max ) and minimum min surface air temperatures at 119 meteorological stations on the Yunnan Plateau (YP, Southwest China) were analysed for temporal trends spatial variation patterns during period 1961–2004. Linear trend analyses revealed that annual temperature over YP increased a rate of 0.3 °C/decade 1961–2004, while warming 0.33 0.26 was observed winter summer temperatures, respectively. Warming nighttime are more pronounced than those daytime...
[1] Recent warming in High Asia might have a strong impact on Asian summer monsoon variability with consequences for the hydrological cycle. Based correlations between climate data, tree-ring δ18O of high-elevation junipers is an indicator August precipitation. Thus, our 800-year long annually resolved oxygen isotope series reflects long-term variations activity southern Tibetan plateau. Summer precipitation was reduced during 13th–15th centuries and since 19th century, whereas Little Ice...
Wood anatomical features may be visible on the microscopic as well macroscopic scale. While former can often quantified by detailed wood analyses, latter are treated qualitative or binary variables (present/absent). Macroscopic tree-ring in terms of frequency, intensity, classified according to their position within a tree ring, like intra-annual density variations (IADFs) conifers frost rings earlywood latewood. Although some these features, e.g. missing IADFs seen anomalies, hampering...
Abstract We developed four tree ring‐width chronologies of three species ( Picea likiangensis Pritz, Tsuga dumosa (D. Don) Eichler and Abies ernestii Rehd.) in the central Hengduan Mountains, north‐western Yunnan, China. Although come from different species, significant correlations exist among (mean r = 0.47), first principal component accounts for 60.5% total variance over their common period 1655–2005. Correlation response function analyses showed that pre‐monsoon (March, April)...
The history of late Holocene glacier fluctuations in eastern Tibet was studied by determining the ages trees growing on deposits. Maximum tree yield minimum AD 1760 and 1780 for moraine formation at maximum extent ‘Little Ice Age’ advances two forefields. Subsequent moraines could be dated to beginning nineteenth twentieth century. Larch from a third forefield southeastern show evidence activity 1580 1590, end eighteenth century 1860 1880. One Mt Gyalaperi recently advanced both 1951 1987....
Abstract Aim Our main aim is to determine if ring‐width variations in Empetrum hermaphroditum reflect regional or local topoclimate signals an alpine environment. In the case that provides dominant signal, a secondary link these spatial distribution patterns of different vegetation types. Location The study area situated middle belt Vågåmo region, Central Norwegian Scandes. Sampling sites cover topoclimates: ridges, north‐facing slopes and south‐facing slopes. Methods We constructed...
Recent studies have linked climatic and social instabilities in ancient China; the underlying causal mechanisms have, however, often not been quantitatively assessed. Here, using historical records palaeoclimatic reconstructions during AD 10–1900, we demonstrate that war frequency, price of rice, locust plague, drought flood frequency temperature China show two predominant periodic bands around 160 320 years where they interact significantly with each other. Temperature cooling shows direct...
Abstract We present a 620‐year long ring width record from the middle Qilian Mountains, where it is presently controlled by Westerlies. The chronology was developed juniper ( Sabina przewalskii ) growing at sites near western distribution limit of species in northern Gansu Province, China. A linear regression model between and annual (July to June) precipitation accounts for 34.9% observed instrumental variance during period 1952 2007. Spatial correlation analyses reconstruction gridded data...
Tree rings are natural archives of climate and environmental information with a yearly resolution. Indeed, wood anatomical, chemical other properties tree synthesis several intrinsic, factors, interconnected processes acting during growth. In particular, Intra-Annual Density Fluctuations (IADFs) can be considered as tree-ring anomalies that used to better understand growth reconstruct past conditions intra-annual However, the ecophysiological behind IADF formation, well their functional...