![]() # Thursday 27th February 2020, 1.00pm - Christine Batchelor, Norwegian University of Science and Technology (NTNU), Trondheim, Norway This talk is by the Climate and Environmental Dynamics - Department of Geography Seminar Series - NOTE THE DIFFERENT TIME, DATE & VENUE The use of marine geophysical data to investigate the climate and environment of the Quaternary Venue: Rm 101, William Hardy Building, Department of Geography, Downing SiteĪn understanding of the configuration and dynamics of ice sheets during the Quaternary Period (last c.2.6 million years) is essential to constrain numerical models of past environmental conditions and to predict the likely future responses of ice sheets to climatic change. This understanding is crucial for being able to predict Greenland’s contribution to sea level rise over the coming decades and century. With sensors deployed at the bed and within the ice, the project has gained a better understanding of the basal hydrology and physical conditions that drive the fast flow of Greenland’s marine-terminating glaciers. The team also used a hot-water borehole drilling system to gain access to the bed at specific targets, which included the shore of a rapidly draining lake, and the drained lake floor where a hydrological connection continued to supply a significant, but variable amount of surface water directly to the basal drainage system. In a multi-disciplinary effect, the team combined geophysical techniques with high accuracy drone surveys in order to track the pathway of surface meltwater, including its rapid descent to the bed when fractures open and supraglacial lakes drain rapidly. In this talk I report outcomes from the interdisciplinary RESPONDER project (which is investigating hydrological networks and flow of the Greenland ice sheet. In Greenland, glaciers are flowing faster, posing a global risk of accelerated sea level rise. Glaciers drain ice sheets by transporting ice from the interior to the coast where ice is discharged into the sea as icebergs. ![]() Talk CANCELLED due to Covid-19 outbreak # Thursday 5th March 2020, 4.00pm - Poul Christoffersen (University of Cambridge) THIS TALK IS CANCELLED DUE TO INDUSTRIAL ACTION Hydrological networks and flow of the Greenland Ice Sheet: Overview of the RESPONDER project Venue: Scott Polar Research Institute, main lecture theatre Hester Jiskoot, Associate Professor of Physical Geography & Glaciology, University of Lethbridge, Alberta, Canada THIS TALK IS CANCELLED The influence of Arctic Fog on Glaciers Venue: Scott Polar Research Institute, main lecture theatre The observation of lakes that can form more easily, further inland and at higher elevations have significant implications for future surface mass balance, and potentially the dynamics of inland regions of the Greenland ice sheet. Output from the regional climate model MAR suggests that in the most recent decade higher numbers of lakes are being formed for a given volume of runoff. Lakes are observed to be occurring at higher elevations in all sectors of the ice sheet for 2010-2019 compared to 2000-2009. Through generating annual composites of where lakes are observed, we identify that the frequency of lakes has on average increased by 27% from 2000-2019. Here we use the entire MODIS Terra archive within Google Earth Engine to derive maps of supraglacial lake cover every day of every melt season for the last 20 years for the entire Greenland ice sheet. However, previous studies of supraglacial lakes have been limited in spatial and/or temporal scale relative to the entire ice sheet. Understanding the relationship of these lakes with ice sheet surface mass balance, geometry, location, and how this has changed through time also informs how their drainage can impact ice sheet subglacial hydrology and seasonal flow dynamics. Supraglacial lakes represent a fundamental component of the surface hydrology of the Greenland ice sheet. SEMINAR CANCELLED DUE TO COVID-19 OUTBREAK James Lea, University of Liverpool CANCELLED DUE TO COVID-19 Insights from mapping Greenland’s supraglacial lakes at unprecedented temporal and spatial scales Venue: Scott Polar Research Institute, main lecture theatre Return to the list of forthcoming seminars. Scott Polar Research Institute - Physical Sciences Seminar: archive Dissertations & Theses by SPRI students.
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