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Fieldwork

Scientists Set Sail to Map the Arctic Seafloor



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Planned tracklines for the 2010 U.S.-Canada Extended Continental Shelf survey
Above: Planned tracklines for the 2010 U.S.-Canada Extended Continental Shelf survey. "EEZ" stands for Exclusive Economic Zone, which extends from a nation's coastline out 200 nautical miles (or to a maritime boundary with another nation). nm, nautical miles; km, kilometers. [larger version]

Coast Guard Cutter Healy
Above: The Coast Guard Cutter Healy. Photo credit: U.S. Coast Guard. [larger version]

Expedition Logo

American and Canadian scientists set sail this summer to map the Arctic seafloor and gather data to help define the outer limits of the continental shelf.

Each coastal nation may exercise sovereign rights over the natural resources of their continental shelf, which includes the seabed and subsoil. These rights include control over minerals, hydrocarbons, and sedentary organisms such as clams and coral.

Under international law, specifically the United Nations Convention on the Law of the Sea, every coastal nation automatically has rights over a continental shelf out to 200 nautical miles or to a maritime boundary. The Convention also states that a nation is entitled to continental shelf beyond 200 nautical miles if certain criteria are met—an area that is referred to as the "extended continental shelf."

The U.S. Geological Survey is the lead science agency for the United States in the 2010 U.S.-Canada Extended Continental Shelf survey. "In this expedition, Canada and the U.S. are working together to delineate the extended continental shelf in the Arctic to better determine where the Convention's criteria can be met," said USGS scientist Brian Edwards, chief scientist on the U.S. Coast Guard Cutter Healy.

The Healy will sail the Arctic from August 2 to September 6, 2010, meeting up with the Canadian Coast Guard Ship Louis S. St-Laurent at sea.

The ships will alternately break through the Arctic sea ice for each other. The Healy will map the shape of the seafloor using a multibeam echo sounder, and the Louis S. St-Laurent will collect multichannel seismic reflection and refraction data to determine sediment thickness.

This is the third year the United States and Canada have collaborated in extended continental shelf data collection in the Arctic. The United States has independently been collecting single ice-breaker data in the Arctic since 2003 in furtherance of the U.S. Extended Continental Shelf Project.

"The Arctic Ocean is an area of great interest for science, resource conservation, and possible economic development," said USGS scientist Deborah Hutchinson. "Because there is an area with considerable overlap between the U.S. and Canadian extended continental shelves, it makes sense to share data sets and work together in the remote and challenging environments of the Arctic Ocean."

"This is the last year working in the Canada Basin north of Alaska, and in 2011, we'll collect data together with Canada in the area north of the Canada Basin around the Alpha Ridge," said USGS scientist Jonathan Childs, who is leading the U.S. Interagency Task Force Seismic Data Operations Team.

Research is coordinated by the U.S. Extended Continental Shelf Task Force, a government-wide group headed by the U.S. Department of State. Participants in this Task Force include the U.S. Department of the Interior; U.S. Geological Survey; National Oceanic and Atmospheric Administration; U.S. Coast Guard; National Science Foundation; Joint Chiefs of Staff; U.S. Navy; U.S. Department of Energy; U.S. Environmental Protection Agency; Executive Office of the President; Bureau of Ocean Energy Management, Regulation, and Enforcement; and the Arctic Research Commission.

Watch a video podcast about this expedition: U.S. - Canada Arctic Expedition Surveying the Extended Continental Shelf.

For additional information on this expedition as well as photographs and video from past cruises, visit the Extended Continental Shelf Project.


Related Sound Waves Stories
Joint U.S.-Canadian Icebreaker Surveys in the Arctic Ocean
April 2009
Scientists Map Unexplored Arctic Sea Floor
September 2008

Related Web Sites
USGS Podacast: U.S.-Canada Arctic Expedition Surveying the Extended Continental Shelf
USGS
2010 Extended Continental Shelf Project
U.S. Extended Continental Shelf Task Force

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Fieldwork
cover story:
Scientists Map the Arctic Seafloor

Ocean Acidification: Research on Top of the World

Tracking Coral Larvae

Comparisons Between Northern and Southern Hemisphere Wetlands

ResearchMarine Research in Dry Tortugas National Park

Sediment Input to the Fringing Reef of Moloka‘i, Hawai‘i

Outreach Scientists Raise Awareness at Hurricane Expo

Meetings Coastal Zone 2011

Publications Aug. / Sept. 2010 Publications


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