The Role of Oceans in Earth and Exoplanet Climates
Earth has had an ocean for more than 4 billion years. It likely formed sometime after the beginning of the Hadean Eon (4.6-4 billion years ago) via mantle degassing as the planet cooled. Although we know significantly more about the modern ocean than we do about its deepest past, an ever-growing body of research suggests that the key to understanding the origin and evolution of life on our planet, and perhaps planets elsewhere, may well be hidden in the ocean’s physical and chemical complexities. In this talk, I will give a broad overview of the fundamental role the ocean plays—and has played—in Earth’s history, from the evolution of early life to the climate we know today. In doing so, I will provide a crash course in physical oceanography, and I will draw from this body of knowledge, as well as recent research in my lab, to help us understand how oceans could behave on exoplanets, including their role in modulating climate and habitability.
Dr. Hannah Zanowski is an assistant professor in the Department of Atmospheric and Oceanic Sciences (AOS) at UW-Madison. She earned her B.S. in physics and mathematics from the University of Arizona in 2011 and her Ph.D. in Atmospheric and Oceanic Sciences from Princeton University in late 2016. Zanowski uses climate models to do her research, which has three major focuses: present and future Arctic Ocean change, the physical oceanography of the Archean (4-2.5 billion years ago), and ocean circulation and heat transport on exoplanets. She is also the director of the STORM REU, a National Science Foundation (NSF)-funded undergraduate summer research program spearheaded by the AOS department in conjunction with the Center for Climatic Research (CCR), the Space Science and Engineering Center (SSEC) and the Cooperative Institute for Meteorological Satellite Studies (CIMSS). In her free time, Zanowski enjoys doing Muay Thai, spending time in the sun, and grossly overestimating how many native plants she really needs for her yard.
This meeting will take place in person at our usual Space Place classroom location. It will also be streamed live to our Youtube channel at https://www.youtube.com/@madisonastronomicalsociety.