Figure 8:  The Crary Ice Rise is the result of an ice-capped island that causes the ice to rise nearly 50 m above the surrounding 400- m-thick Ross Ice Shelf in Antarctica. The rise rests in the downstream ice flow from two of the ice streams that create the Ross Ice Shelf, which floats on the Ross Sea in the region of West Antarctica generally south of New Zealand. Recent research suggests that the area just downstream of the ice rise is thinning by about 1 m/yr, while other areas are thickening. Comparison of formerly classified photographs taken by DOD's Corona satellite in 1963 with images from France's SPOT satellite taken in 1995, along with recent studies, suggest that natural variations or cycles in the two converging ice streams feeding this region may be contributing to the current cracking that is observed in the ice shelf, rather than human influences acting alone or even being a dominant factor (see Appendix D for further information). Source: Byrd Polar Research Center at Ohio State University, Columbus, OH, and the MEDEA initiative to declassify previously classified photographs and other intelligence-derived information about the environment.


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