Bannister 110

VS-Growth Evolution Neural Network (VS-GENN)

The tree-ring response to climate change is one of the most interesting problems in modern forest ecology. Despite the large number of papers on tree-ring response to environmental change (temperature increase, irrigation, drought, etc.) there is no reliable answer to how woody plants will respond to such change in different forest stands and biogeographic zones. The process-based tree-ring model developed by Vaganov & Shashkin ( VS-model) can be a key to answering this question.Two new principal approaches are described:

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Tree-ring Dating the Llaves Valley Gallina

The 1970s were a period of intense activity in the Gallina heartland of north-central New Mexico. Excavations by James Mackey and Sally Holbrook and by Herb Dick documented dozens of Gallina sites and structures in the Llaves Valley alone. Unfortunately, analysis and publication did not always follow excavations, particularly in Herb Dick’s case. His untimely death in 1993 left much of his excavated material in disarray.

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Tree-Ring Talk, topic to be decided

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Dendrochronology and middle Miocene petrified oak: Modern counterparts and interpretation

This study reports the first successful statistical ‘crossdating’ among ring width time series from many specimens of petrified wood, based samples of the genus Quercus from the Stinking Water (SW) site in Oregon, a Miocene-aged exposure associated with the Columbia River Basalts. Ring width time series from 26 radii, 17 different trees, show significant intercorrelation.

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Tree-Ring Talk, topic to be decided

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Probing (into) the memory of trees with dendrochronology

Communicating with trees through dendrochronology involve developing observational skills that goes beyond the usual year-to-year changes in ring width. Developing excellent observational skills is at the core of crossdating and dendrochronology. Understanding how tree-rings are affected by environmental factors also allows their use in reconstructing conditions prior to the onset of instrumental records. In this talk, I will briefly cover a few research projects being pursued at the University of Winnipeg DendroEcology Laboratory (UWDEL).

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Asian Monsoon Variability over the Past Millennium Reconstructed from Long Tree-Ring Records: the Monsoon Asia Drought Atlas, version 2 (MADAv2)

The Monsoon Asia Drought Atlas, version 2 (MADAv2), is a substantially updated and improved year-to-year reconstruction of summer drought and wetness on a 1.0° grid over Monsoon Asia. It has been developed using the same basic methodology as that used in producing the previous version (MADAv1) published in 2010 and is now based on an improved target field of self-calibrating Palmer Drought Severity Indices (scPDSI) and a significantly larger network of 453 tree-ring chronologies compared to the previous effort.