Tree-Ring Talk

Archaeology of Central Kazakhstan: Recent Improvement of Chronology Empowers Studies of Eurasian Steppe Prehistory

Kazakh archaeologist Emma Usmanova has been studying Bronze Age prehistory of the Eurasian Steppe and making significant contributions to comprehensive understanding of population dynamics and cultural evolution of the Steppe for the last 30 years. The first part of this talk is focused on the impact of absolute dating on the development of multidisciplinary research at the Lisakovsky archaeological complex, the key site of the Andronovo community in Kazakh grasslands.

UA-Vitae Revelations for those needing to submit annual report

This year, Tree-Ring Lab. faculty who submit annual reports must now use the University of Arizona reporting system called UA Vitae.  Because this is the first time LTRR faculty will use this system, and it has a steep learning curve and is probably not as intuitive as the designers imagine, this session will help introduce the Vitae platform, provide tips for how to navigate it, answer questions, and provide some personal guidance for attendees.  Attendees are welcome to bring their laptops and follow along with the tour of the site and its features.

Australian Artist Nicholas Mangan Presents His Works

Visiting artisit Nicholas Mangan will be giving a presentation about his past and current projects and talk about what has brought him from Australia to work with Laboratory of Tree-Ring Research. Please join us for this exciting event. To see more work by Nicholas Mangan please visit http://www.nicholasmangan.com/ 

Preparing your sample collections for archiving: Q&A discussion about what you should be doing

Primarily an opportunity for question and answer, this forum will include a very brief refresher on the primary reasons for archiving specimens followed by review of procedures.

Late winter post-volcanic temperature response in western North America: relationships with ENSO phases — AND – Recent California and western Nevada precipitation deficits in the context of the last half-millennium

Dr. Wahl will discuss his most recent published work in western North America paleoclimatology, done in conjunction with Drs. Henry Diaz, Jason Smerdon, and Caspar Ammann

Low-frequency streamflow signal from cottonwood tree rings

Tree-ring reconstructions from ring widths of upland trees are a longstanding source of information on variability of streamflow.  Such trees sense variations in net precipitation in runoff-producing parts of a watershed.  While riparian trees are much less commonly applied in streamflow reconstruction, large multi-aged populations of riparian trees offer the opportunity to improve reconstructions of streamflow through alternative standardization methods and a direct pathway of response of growth to changes in stream level.

Megafires, climate, and future forests

Wildfires of uncharacteristic severity interact with climate change and other disturbances to alter dry pine forests in western North America and the Mediterranean Basin. These fires present challenges for society and for the sustainability of ecosystems. While there are many differences between regions and nations, there are opportunities for comparative studies to assess current megafires and forecast future ecosystem change. 

Drought-Associated Tree Mortality: Global patterns and insights from tree-ring studies in the Southwestern U.S.A.

Forests play an important role in the earth system, regulating climate, maintaining biodiversity, and provisioning human communities with water, food and fuel. Interactions between climate and forest dynamics are not well constrained, and high uncertainty characterizes projections of global warming impacts on forests and associated ecosystem services. Recently observed tree mortality and forest die-off forewarn an acceleration of forest change with rising temperature and increased drought.

What can we learn from the arctic shrub (-rings)? Dendrochronological records of shrubs' annual growth in High and Low Arctic sites (Spitsbergen, Greenland, Alaska)

Recent changes in the thermal regime of the Arctic and related tundra expansion in higher latitudes resulted in an intense development of dendrochronological and dendroecological studies in the polar regions. In last decade we observed a significant increase in the use of tree-ring growth analysis in high latitudes where radial growth of woody plants, from shrubs to perennial herbs, is studied. Thermal limitations of cambial growth in the Arctic enable mainly dendroclimatological studies, which application requires a construction of reliable tree-ring chronologies.

Science at 9157': how the UA Sky School can help with your research and outreach needs

We provide year-round residential science programs (1-5 days) to Arizona K-12 students at our 25-acre Mt. Lemmon campus. Our philosophy is to provide place-based, inquiry-based, and outdoor science education. Programs include:

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