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How are melting ice sheets causing sea level rise and what can we do about it? The ice sheets in Greenland and Antarctica, along with glaciers and ice caps around the world, are melting faster than anticipated as a result of climate change caused by greenhouse gases from human activities. This rapid evolution–resulting from complex interactions between the atmosphere, the ocean gas 78 facebook, and ice–has been captured in great detail by a growing body of observational platforms that include satellites, aircraft, underwater floats, and autonomous gliders. In this talk, Dr. Eric Rignot will cover how and why the ice sheets are melting and what we can do about it. Practical solutions exist that are economically viable and ethically desirable, including transforming our energy production system and developing scalable carbon sequestration strategies. At stake is whether the world will be irreversibly committed to a multiple meter rise in sea level with potentially catastrophic consequences.

Eric Rignot is the Donald Bren Professor of Earth System Science, Chair of the c gastronomie vitam Department of Earth System Science, School of Physical Sciences at the University of California, Irvine, and a Senior Research Scientist at Caltech’s Jet Propulsion Laboratory. Dr. Rignot’s research interests include glaciology, ice dynamics, ice-ocean interaction, climate change, ice/ocean numerical modeling, remote sensing, and field work. One goal of his research group is to better understand the interaction of ice and climate to yield realistic projections of the contribution of ice sheets to sea level rise. He is a member of the National Academy of Sciences and has received NASA Exceptional Scientific Achievement Medals, the NASA Outstanding Leadership Medal, the Louis Agassiz Division Medal of the European Geophysical Union, and the Nobel Peace Prize with co-authors of IPCC AR4 in 2007. His research has been covered by the Los Angeles Times, Washington Post, BBC, Arte, CNN, PBS/NOVA electricity electricity lyrics, National Geographic, Rolling Stones, and the New York Times. He has been featured in “An Inconvenient Sequel” (2018), HBO VICE News (2015), “Chasing Ice” (2012) and “Naked Science” (2004 gas works park fireworks).

Magma chambers in Earth’s crust can grow to be hundreds to thousands of cubic kilometers, potentially feeding catastrophic caldera‐forming eruptions. Smaller‐volume chambers are expected to erupt frequently and freeze quickly; a major outstanding question is how magma chambers ever grow to the sizes required to sustain the largest eruptions on Earth. I will present recent results from Townsend et al. 2019 G-cubed, which uses a thermo‐mechanical model to investigate the primary factors that govern the extrusive:intrusive ratio in a chamber, and how this relates to eruption frequency, eruption size, and long‐term chamber growth. The model consists of three fundamental timescales: the magma injection timescale τin, the cooling timescale τcool, and the timescale for viscous gas house edwards co relaxation of the crust τrelax. We estimate these timescales using geologic and geophysical data from four volcanoes (Laguna del Maule, Cam! pi Flegrei, Santorini, Aso) to compare them with the model. In each of these systems, τin is much shorter than τcool and slightly shorter than τrelax, conditions that in the model are associated with efficient chamber growth and simultaneous eruption. In addition, the model suggests that the magma chambers underlying these volcanoes are growing at rates between ~10‐4‐10‐2 km3/yr, speeding up over time as the chamber volume gas and water company increases. We find scaling relationships for eruption frequency and size that suggest that as chambers grow and volatiles exsolve, eruption frequency decreases but eruption size increases. These scaling relationships provide a good match to the eruptive history from the natural systems, suggesting the relationships can be used to constrain chamber growth rates and volatile saturation state from the eruptive history alone.

On behalf of the officers of the DMV Chapter of the Association for Women Geoscientists, we would like to invite you to our February event, “Pathways: Women in Earth Science Career Panel.” This event is intended to provide a forum for earth science professionals to share their expertise in applied science, business development, knowledge of career opportunities, and insights about career paths with earth science students and early career professionals. Our panel includes a dynamic range of professionals working in academia, policy, government research, and industry. Please join us to learn more about pathways available to you!

The panel will be held at 6:30pm on Thursday, February 28th at the Cleveland Park Public Library in Washington, DC. Light refreshments will be served, and our gas pains or contractions panelists are ready to contribute to lively discussions! Note that this event is open to all genders interested in learning about multiple career paths. Please RSVP through the link below, we hope to see you there!