A5001444164- Tree-ring climate responses
- Plant Water Relations and Carbon Dynamics
- Geology and Paleoclimatology Research
- Climate variability and models
- Climate change and permafrost
- Forest ecology and management
- Cryospheric studies and observations
- Ecology and Vegetation Dynamics Studies
- Environmental and Cultural Studies in Latin America and Beyond
- Fire effects on ecosystems
- Plant responses to elevated CO2
- Tree Root and Stability Studies
- Hydrology and Drought Analysis
- Atmospheric and Environmental Gas Dynamics
- Oceanographic and Atmospheric Processes
- GNSS positioning and interference
- Isotope Analysis in Ecology
- Smart Materials for Construction
- Geochemistry and Geologic Mapping
- Landslides and related hazards
- Remote Sensing and LiDAR Applications
- Hydrology and Watershed Management Studies
- Arctic and Antarctic ice dynamics
- Peatlands and Wetlands Ecology
- Forest Ecology and Biodiversity Studies
Centre for Research on Ecology and Forestry Applications
2021-2025
Institució Catalana de Recerca i Estudis Avançats
2021-2025
Lamont-Doherty Earth Observatory
2016-2025
Universitat Autònoma de Barcelona
2024
Columbia University
2015-2024
Institut Català de Ciències del Clima
2011-2017
Universitat de Barcelona
2004-2012
Forschungszentrum Jülich
2008
Hokkaido University of Science
2004
Abstract Recent research using repeat photography, long-term ecological monitoring and dendrochronology has documented shrub expansion in arctic, high-latitude alpine tundra ecosystems. Here, we (1) synthesize these findings, (2) present a conceptual framework that identifies mechanisms constraints on increase, (3) explore causes, feedbacks implications of the increased cover ecosystems, (4) address potential lines investigation for future research. Satellite observations from around...
Climate model projections suggest widespread drying in the Mediterranean Basin and wetting Fennoscandia coming decades largely as a consequence of greenhouse gas forcing climate. To place these other "Old World" climate into historical perspective based on more complete estimates natural hydroclimatic variability, we have developed World Drought Atlas" (OWDA), set year-to-year maps tree-ring reconstructed summer wetness dryness over Europe during Common Era. The OWDA matches accounts severe...
Arctic warming can influence tundra ecosystem function with consequences for climate feedbacks, wildlife and human communities. Yet ecological change across the biome remains poorly quantified due to field measurement limitations reliance on coarse-resolution satellite data. Here, we assess decadal changes in greenness using time series from 30 m resolution Landsat satellites. From 1985 2016 increased (greening) at ~37.3% of sampling sites decreased (browning) ~4.7% sites. Greening occurred...
Abstract Tree populations located at the geographical distribution limit of species may provide valuable information about tree‐growth response to changes on climatic conditions. We established nine Pinus nigra , 12 P. sylvestris and 17 uncinata tree‐ring width chronologies along eastern northern Iberian Peninsula, where these are found edge their natural range. Tree‐growth variability was analyzed using principal component analysis (PCA) for period 1885–1992. Despite diversity species,...
Abstract The increasing carbon dioxide (CO 2 ) concentration in the atmosphere combination with climatic changes throughout last century are likely to have had a profound effect on physiology of trees: altering and water fluxes passing through stomatal pores. However, magnitude spatial patterns such natural forests remain highly uncertain. Here, stable isotope ratios from network 35 tree‐ring sites located across Europe investigated determine intrinsic water‐use efficiency ( iWUE ), ratio...
We present the first European network of tree ring δ 13 C and 18 O, containing 23 sites from Finland to Morocco. Common climate signals are found over broad climatic‐ecological ranges. In temperate regions we find positive correlations with summer maximum temperatures negative precipitation Palmer Drought Severity Indices (PDSI) no obvious species‐specific differences. Regional O chronologies share high common variance in year‐to‐year variations. Long‐term variations, however, exhibit...
We investigated the tree growth and physiological response of five pine forest stands in relation to changes atmospheric CO2 concentration (ca) climate Iberian Peninsula using annually resolved width δ13C tree-ring chronologies since ad 1600. 13C discrimination (Δ≈ci/ca), leaf intercellular (ci) intrinsic water-use efficiency (iWUE) were inferred from values. The most pronounced observed during second half 20th century, differed between stands. Three sites kept a constant ci/ca ratio,...
Abstract Climate reconstructions using stable isotopes from tree‐rings are steadily increasing. The investigations concentrate mostly on cellulose due to its high stability. In recent years the available amount of has decreased, mainly because micro‐structures plant material have had be analyzed. Today, amounts being studied frequently in milligram and often microgram range. Consequently, homogeneity problems with regard carbon oxygen occurred these called for new methods preparation...
Abstract Aim Climate change is expected to modify growth trends of forests around the world. However, this modification may vary in strength and intensity across a species' biogeographical range. Here, we study European populations silver fir ( Abies alba ) its southern distribution limits Spain, Italy Romania. We hypothesized that will differ range, with marked decline drought‐prone regions near southernmost limits. Location Europe (Spain, Italy, Romania). Methods collected tree‐ring data...
Growth models can be used to assess forest vulnerability climate warming. If global warming amplifies water deficit in drought-prone areas, tree populations located at the driest and southernmost distribution limits (rear-edges) should particularly threatened. Here, we address these statements by analyzing projecting growth responses of three major species (silver fir, Abies alba; Scots pine, Pinus sylvestris; mountain uncinata) mountainous areas NE Spain. This region is subjected...
Abstract X‐ray microdensitometry on annually resolved tree‐ring samples has gained an exceptional position in last‐millennium paleoclimatology through the maximum latewood density (MXD) parameter, but also increasingly other parameters. For 50 years, based measurement techniques have been de facto standard. However, studies report offsets mean levels for MXD measurements derived from different laboratories, indicating challenges of accuracy and precision. Moreover, reflected visible...
Mongolian tree rings indicate that recent moisture extremes, although unusual, are not unprecedented in the last 2060 years.
Significance Climate extremes are major drivers of long-term forest growth trends, but we still lack appropriate knowledge to anticipate their effects. Here, apply a conceptual framework assess the vulnerability Circum-Mediterranean Abies refugia in response climate warming, droughts, and heat waves. Using tree-ring network process-based model, future Mediterranean forests. Models abrupt reductions for late 21st century when climatic conditions will be analogous most severe dry/heat spells...
In north-western North America, the so-called divergence problem (DP) is expressed in tree ring width (RW) as an unstable temperature signal recent decades. Maximum latewood density (MXD), from same region, shows minimal evidence of DP. While MXD a superior proxy for summer temperatures, there are very few long records America. Latewood blue intensity (LWB) measures similar wood properties MXD, expresses climate response, much cheaper to generate and thereby could provide means profoundly...
Abstract Northwestern North America has one of the highest rates recent temperature increase in world, but putative “divergence problem” dendroclimatology potentially limits ability tree-ring proxy data at high latitudes to provide long-term context for current anthropogenic change. Here, summer temperatures are reconstructed from a Picea glauca maximum latewood density (MXD) chronology that shows stable relationship regional and spans most last millennium Firth River northeastern Alaska....
The response of boreal forests to anthropogenic climate change remains uncertain, with potentially significant impacts for the global carbon cycle, albedo, canopy evapotranspiration and feedbacks into further change. Here, we focus on tree-ring data from Firth River site at treeline in northeastern Alaska, a tundra–forest transition region where pronounced warming has already occurred. Both width (TRW) maximum latewood density (MXD) chronologies were developed identify nature tree growth...
Abstract Historical and future trends in net primary productivity (NPP) its sensitivity to global change are largely unknown because of the lack long-term, high-resolution data. Here we test whether annually resolved tree-ring stable carbon (δ 13 C) oxygen 18 O) isotopes can be used as proxies for reconstructing past NPP. Stable isotope chronologies from four sites within three distinct hydroclimatic environments eastern United States (US) were compared time space against satellite-derived...
Abstract Climate change is increasing the intensity and frequency of extreme heat events. Ecological responses to will depend on vegetation physiology thermal tolerance. Here we report that Larix sibirica , a foundation species across boreal Eurasia, vulnerable at its southern range margin due low tolerance (T crit photosynthesis: ~ 37–48 °C). Projections from CMIP6 Earth System Models (ESMs) suggest leaf temperatures might exceed 25 th percentile ’s T by two three days per year within next...
In this study, we present a comprehensive atmospheric radiocarbon (