Events and News


THURSDAY, FEBRUARY 20 @ 6:30 PM – 8:00 PM

Bess G. Koffman, Assistant Professor of Geology at Colby College will present — Climate Change: How Do We Know?

How do we know that Earth’s climate is changing? How do current trends fit into longer-term, natural cycles of climate change? How will changes in global climate impact us here in Maine?

This talk will focus on establishing the evidence for present-day climate change, and placing it in the context of past climate changes. We will use data from a range of natural climate archives, such as lake sediment cores, ice cores, and tree rings, to learn how climate has changed through time, both globally and here in Maine.  Dr. Bess Koffman, a geology professor at Colby College, is a paleoclimate scientist with twelve years’ experience working in the field of ice core paleoclimatology. She will speak about her research using ice cores from Antarctica and Alaska to study Earth’s climate. Dr. Koffman’s research is focused on learning about past changes in Earth’s atmospheric circulation, or winds. She uses mineral dust as a tracer of past wind patterns by measuring the dust particle size distribution (a proxy for distance to source and wind strength) and its geochemical composition (to determine provenance and transport pathway). She also studies the impacts of dust and volcanic deposition on marine ecosystems, where these particles can serve as an important fertilizer. She teaches the following courses at Colby: Earth Systems Chemistry; Earth’s Climate: Past, Present, and Future; Topics in Geochemistry; and Paleoceanography.