Sounds of the Southern Ocean
by Bill Hanshumaker
Hatfield Marine Science Center
The Southern Ocean surrounds Antarctica and serves as a conduit between the Atlantic, Pacific and Indian oceans. Yet because of severe climatic conditions, much of this ocean basin remains unexplored. Polar regions play key roles in the global environment and one goal of our project is to document linkages between changes to the Antarctic ice sheet and the volcano-tectonic seafloor processes in the region. To meet the challenge for continuous monitoring in this extreme environment, researchers from the Hatfield Marine Science Center utilized the Russian icebreaker Yuzhmorgeologiya to deploy an array of Autonomous Underwater Hydrophones (AUH). This new ocean-sensor technology uses cold-water capable, deep-ocean hydrophones to record sounds generated by moving ice sheets, undersea earthquakes and volcanoes; even vocalizations from large baleen whales. When the AUH array is recovered in 2006, sounds that it has captured will enable accurate monitoring of global climate change, as well as identifying previously unknown volcanically active regions on the polar seafloor. (more…)