Tree-Ring Talk

Single-year dating of Siberian Scythian kurgans with 14C spike

Abstract

Photosynthetic carbon isotope discrimination in trees: observations, predictions, and drivers

Abstract: Under elevated CO2, photosynthetic carbon isotope discrimination is expected to increase in response to photosynthesis stimulation driven by the growth of atmospheric CO2. While this response is widely documented in laboratory, field experiments and short-term observations, long-term proxies indicate that such response is not universally observed in forested ecosystems.

Impact of persistent droughts on forests in Mediterranean Chile

Global warming is concurrently associated with a rise in occurrences of drought episodes in numerous regions worldwide, with central Chile a sad example. This region is the only Mediterranean bioregion of South America, which is considered a biodiversity hotspot due to high endemism levels and high anthropic pressure. These ecosystems since 2010 have been impacted by a period of below-average rainfall, a so-called Mega Drought (MD), so their contribution to the regional carbon sink is at risk.

State-of-the-art radiocarbon measurements to study Earth's carbon cycle

The development of high-precision, rapid through-put radiocarbon dating for small samples via a compact accelerator mass spectrometer — the MIni CArbon DAting System (MICADAS) — has opened a wide variety of new possibilities for next generation radiocarbon studies. This talk will explain the basics of the instrumentation (which will be installed in the Laboratory of Tree-Ring Research in 2024) and explore a variety of examples of the ways in which it can be used to explore the carbon cycle and beyond.

Using the Vaganov-Shaskin growth model to infer climate limitations of tree growth

A four-century extension of the long BC conifer chronology in the eastern Mediterranean and other additions

Some 29 newly-reanalyzed data sets from Turkey, Greece, and Cyprus have allowed the extension of the long BC conifer chronology, which begins in the early 30th century BC and which has been stalled for years in the middle of the 8th century BC, down three and a half centuries to 307 BC. Our so-called “Roman Gap” is getting shorter.

Modelling explosive volcanic eruptions from proximal hazards to global climate disruption

Note that this talk was rescheduled from Wednesday April 19 at noon.

Snapshots of a warmer North from ancient buried wood deposits in subarctic Canada and Alaska

Buried wood in arctic and subarctic North America, preserved in diverse depositional settings, provide glimpses of past landscapes and environmental change. In the Yukon and Alaska, ancient forest remains exposed in mining cuts and river bluffs help us understand how permafrost behaved during persistent warming of the last interglaciation ~125,000 years ago.

Ceci n’est pas un arbre: How to draw a functional tree.

Tree-ring growth is a daily scaled process, where endogenous and environmental components orchestrate wood formation through a series of developmental events that can be monitored studying plant phenology. Recent studies demonstrate that the temporal dynamics of wood formation inferred from phenology monitoring are excellent markers of tree sensitivity to weather and climate fluctuations. Encompassing for acclimation and adaptation components, wood developmental dynamics provide indeed for excellent metrics to predict tree-ring growth and productivity.

Tree growth and hydrology in Southeastern South America: how tree rings reveal the history of climate and streamflow in Uruguay

Tree-ring research is expanding into savanna and grassland biomes, where trees are a relatively scarce yet valuable source of historical data on climate history.

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