February 8, 2019
3:00pm in PLS 1140
Nicholas Schmerr from University of Maryland, College Park
Sounding Ice: Exploring For Liquid Water in the Frozen Subsurfaces of Greenland and Europa

Abstract: The polar ice caps of Earth are rapidly melting under the influence of global warming. On the Greenland ice sheet, the resulting melt water is creating many new types of glacial features, including lakes deep beneath the overlying ice, liquid water stored in aquifers in the near surface ice and snow, and stunning aquamarine ponds of melt at the surface. My team and I are investigating the properties and size of these melt pockets using advanced geophysical tools to look through the ice and determine where and how much liquid water is present. We are using this unique Greenland environment to plan for exploring the interior of Europa, Jupiter's icy moon. Our techniques for studying liquid water within the Greenland ice sheet provide crucial inputs for future NASA missions that plan to investigate the properties of the subsurface Europa ocean (and other icy ocean worlds like it) and determine if Europa could potentially harbor life.

February 15, 2019
3:00pm in PLS 1140
Ciaran Harman from Johns Hopkins University
Co-evolution, bedrock weathering, and lateral flow in hillslopes

Abstract: Catchment hydrology has struggled to develop a unified approach to understanding and predicting the internal organization of hillslopes, and the process dynamics that apparently control the delivery of water and solutes to streams. This arguably limits our ability to deliver the kind of predictions needed for water resource planning and regulation the over the long term, and across spatial scales. To address this challenge, perhaps we need to reframe the question entirely: in addition to asking “what is the hydrologic structure of the landscape?” we should also be asking “why is it so?”. How do landscapes develop the hydrologic properties they have? The potential and promise of ‘co-evolution’ or ‘Darwinian hydrology’ has been widely discussed, but there have been limited attempts to address the question directly. Here I will present an attempt to understand how the internal structure of chemically-weathered hillslopes could both control and be controlled by the lateral flow of meteoric water towards adjacent streams. I will present a model that couples hillslope hydraulics and solute transport with a parsimonious model of geochemical weathering and its effect on porosity and permeability. The resulting approximate analytical solutions yield realistic hillslope internal architectures when supplied with realistic geomorphic, geochemical and hydrologic parameter values derived from literature.

February 22, 2019
3:00pm in PLS 1140
David Kring from USRA - Lunar and Planetary Institute
The Discovery of the Chicxulub Crater and Recent Insights from IODP-ICDP Expedition 364

Abstract: The discovery of the Chicxulub impact crater added tremendous credibility to the impact-mass extinction hypothesis.  That discovery led, in turn, to detailed studies of the impact’s environmental effects.  More recently, deep subsurface drilling by IODP and ICDP provided an opportunity to study the formation of the extraordinary ~180 km diameter basin, which shattered the Yucatan Peninsula, causing once immobile granite to flow in excess of a hundred kilometers an hour.  The heat of the impact spawned a vast hydrothermal system that persisted for about a million years.  That hydrothermal system is currently being used as a proxy for Hadean Earth systems that may have hosted Earth’s earliest life.

Sign up to meet with David Kring Password Protected

March 1, 2019
3:00pm in PLS 1140
Linda Gundersen from USGS
Scientific Integrity, Ethics, Diversity, and Sexual Harassment: Why Should You Care?

Abstract: Understanding the values each person brings to the table is key to understanding how ethics, integrity, diversity, and  harassment are connected. Values are critical, they determine decisions we make such as falsifying data or consciously discriminating to out-compete someone. Values also determine our implicit and explicit biases, both scientific and personal. Through these biases we may systematically exclude ideas, people, and practices; weakening the very framework of science. This presentation explores these concepts interactively with the audience through learning, scenarios, and discussion.

March 15, 2019
3:00pm in PLS 1140
Megan Holycross from Smithsonian
March 29, 2019
3:00pm in PLS 1140
Meredith Townsend from Brown University
Stow or blow? Insights on magma transport and storage from mechanical modeling and field observations
April 5, 2019
3:00pm in PLS 1140
Mark Kurz from Woods Hole Oceanographic Institution
April 19, 2019
3:00pm in PLS 1140
Jessica Warren from University of Delaware
April 26, 2019
3:00pm in PLS 1140
Rob Holder from John Hopkins University

The coordinator for the Colloquium Series is Dr. Mong-Han Huang. You can contact him at mhhuang@umd.edu.
If you would like to suggest a speaker for a future seminar, click here. Password Protected