Bannister 110

Signs of climatic variation in the width and density of P. hartwegii tree-rings at the ends of its elevational gradient in the mountains of central Mexico

Trees in alpine forests, being sessile and long-lived organisms, are exposed to intra- and inter-annual climatic variation, which is recorded in their growth rings. Specifically, trees growing at the ends of their natural distribution are the most affected due to in those sites the conditions are marginal and adverse for their development and growth. The objective was to evaluate how interannual climatic variation affects the width (RW) and density (RD) of tree-ring formation of P.

Eastern North Pacific tropical cyclone influences on southwestern North America

The eastern North Pacific (ENP) basin boasts a high density of tropical cyclone (TC) formation compared with other ocean basins in which TCs occur. Since ENP TCs can form near or otherwise impact land, they serve as an important yet variable source of summer and fall precipitation in southwestern North America. Higher sea surface temperatures (SSTs) and reduced vertical wind shear associated with El Niño events tend to support increased TC activity, exemplified by the very active 2015 ENP hurricane season.

Dendro Down Under: Expanding Tree-Ring Research in Australia

In this seminar Heather will discuss her adventures in undertaking dendrochronology in Australia with a focus on three area of dendrochronological studies.

Studying solar variability with radiocarbon in tree rings

The Sun provides virtually all the principal energy input to the Earth’s climate system and solar variability is a significant external climate forcing. For instance, the sun irregularly expels large amounts of energetic particles into the interplanetary space and towards Earth which can be observed as so-called solar proton events (SPE), which can potentially cause major damages to satellites and can even disrupt sensitive electronic systems at ground level.

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