Bannister 110

ATMO 451A/451A Physical Meteorology I

ATMO 451A/451A Physical Meteorology I

Stable isotopes in tree rings of Pinus heldreichii can indicate climate variability over the eastern Mediterranean region

A long-term context is important for understanding past climatic variability. Although tree-ring widths (TRWs) are widely used as a proxy for reconstructing past climate, the use of annually-resolved values of δ ¹³C and δ ¹⁸O tree-ring stable isotopes (TRSIs) is increasing and may provide further valuable information. Here, we present a 487-year-long TRW chronology and 240-year-long TRSI chronology for Bosnian pine (Pinus heldreichii H. Christ) and compare them to each other.

Widths and stable isotopes of Larix tree rings in a glacier-fed river basin in the Swiss Alps respond to a changing climate

Tree-rings are a valuable proxy for reconstructing past environmental conditions such as climate at annual or intra-annual resolutions. Tree-ring dating combined with stable isotope analysis (e.g. δ ¹⁸O and δ ²H) has an enormous potential for better understanding climate dynamics and for tracing freshwater resource availability under a changing climate.

AV setup for Edge defense

Reconstructing northeastern Pacific climate variability from the annual growth increments of Pacific geoduck (David Edge PhD Defense)

Abstract: The long-term character and range of northeast Pacific climate variability is largely unknown due to the short period of instrumental record and poor agreement among existing reconstructions. To address this issue, a multi-centennial record of northeast Pacific climate is developed from a new archive, the Pacific geoduck, a long-lived marine bivalve known to form annual growth increments within its shell.

Tour for Environmental Journalism

Direct effects of tephra fallout on Nothofagus pumilio ring widths in northern Patagonia

We evaluated the radial growth response of adult Nothofagus pumilio (Poepp. et Endl) Krasser trees affected by tephra deposition following historical volcanic eruptions of the Puyehue–Cordón Caulle Volcanic Complex (PCCVC) in northern Patagonia. Standard tree–ring width chronologies were developed for trees from two sites that were affected by up to 55 cm of tephra during the 2011 eruption, which allowed us to detect the general tree–growth response to eruptions VEI ≥ 3 and VEI ≤ 2.

Teaching dendroclimatology to our educators and youth

Bryan Yockers and Lee Borzick were invited to participate in the Research Experience for Teachers collaborative research project by the Laboratory of Tree-Ring Research, funded by the National Science Foundation, and led by Irina Panyushkina and Dave Meko.

Upside down and the game of C allocation

Soluble sugars (e.g. glucose, fructose and sucrose) and starch are the most abundant components of the non-structural carbohydrates (NSCs) stored in woody tissues of the stem and roots. These compounds represent the most abundant C reserves in trees, contributing to plants survival and their resilience to adverse conditions. These compounds are involved in controlling and regulating photosynthate allocation between C supply and demand.

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