An Active Subglacial Water System in West Antarctica Mapped from Space
Helen Amanda Fricker, Ted Scambos, Robert Bindschadler, Laurie Padman
Supporting Online Material
This supplement contains:
Materials and Methods
SOM Text
Figs. S1 to S4
References
Movies S1 and S2
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Movie S1
This animation helps to explain the dynamics of subglacial water exchange and how it can be observed from space. It begins with a nadir camera view looking down onto the Antarctic continent, then the camera moves down to a cross section of the ice sheet with lakes hidden deep beneath the ice. As pressure is exerted on one lake, the water in it is forced to an adjacent lake. This water movement results in an elevation change at the surface, detectable by ICESat. The camera then moves to a "top-down" view of a larger system of these hidden lakes and streams before dissolving into actual observed ICESat data (cropped from Fig. 3 of the main text). Movie credit: NASA/GSFC/Susan Twardy.
Movie S2
MODIS images reveals hidden Lake Engelhardt deep beneath the Antarctic ice sheet. This lake drained throughout a three-year period from 2003 through 2006, gradually revealing its form. This animated sequence shows MODIS images from each year 2000 through 2005. Notice how a depression representing the location of subglacial Lake Engelhardt appears in the last three years of the sequence. In addition, notice how the grounding line on the right side of the frame retreats throughout the sequence. Movie credit: NASA/GSFC/Andrew Freeburg.
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