Academic Report on 2014-8-22: Oxygen isotope dendrochronology-its background, development and applications
Subject: Oxygen isotope dendrochronology-its background, development and applications
Speaker: Prof. Takeshi Nakatsuka (Research Institute for Humanity and Nature, Kyoto 603-8047, Japan)
Brief introduction to the speaker:
Prof. Nakatsuka’s specialties are palaeoclimatology and isotope biogeochemistry. Since his early career as a graduate student, he has been using nitrogen isotopes to study long-term variations of climate and its impacts on oceanic biogeochemical cycles. Recently, he changed his main research area from oceans to land and focused on using tree-ring oxygen isotopes to examine the relationship between climate change and human history. Investigating periodicity of climate during last two millennia in Japan and the world, he now hypothesizes that past human societies were often damaged by multi-decadal climate variations as they were caught in a cycle of over-adaptation and subsequent collapse.