Diatoms in Lake Sediments as Proxies of Climatic Variation Throughout the Latest Holocene

Abstract

This thesis is composed of manuscripts investigating the impact of climate events throughout the past ~2800 years on conditions within the lacustrine environment of Pocket Lake as reflected in changes of diatom assemblage. The first manuscript presented in chapter 2 is composed of a broad, paleoclimatic reconstruction at a resolution of ~20-30 years per sample based on changes in diatom assemblage integrated with geochemical and particle size datasets from the same core. In the second chapter a high-resolution investigation into the impact of the deposition of airfall tephra into Pocket Lake is presented. Together, these studies provide insight into the impact of broader decadal scale climate cycles and instantaneous, episodic events allowing for a more comprehensive understanding of their impact on lakes in sensitive, northern locations. These reconstructions will help inform predications regarding the potential impact of 21 st century climate change.

Crustal earthquake triggering by pre-historic great earthquakes on subduction zone thrusts

“…Uplifted site (reference near symbol) 3 Paleoseismic studies: 1 -Sherrod et al, 20042 -Nelson et al, 20083 -Johnson et al, 2004…”