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U.S. - Canada Arctic Expedition Surveying the Extended Continental Shelf
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Jessica Robertson: Hello and welcome to USGS CoreCast. My name is Jessica Robertson and I will be your host today. This August, American and Canadian scientists will put on their cold weather gear and head north on a collaborative expedition to map the Arctic seafloor. The data they gather will help define the outer limits of the continental shelf in the Arctic Ocean and ultimately define both countriesí sovereign rights over minerals, petroleum, clams, coral and more.

Today we are joined by USGS scientists Debbie Hutchinson, Brian Edwards and Jonathan Childs to discuss this upcoming mission, past expeditions and the overall project. Thank you all for joining us today.

Jonathan Childs: Well, itís my pleasure to be here!

Debbie Hutchinson: Thanks for having us!

Brian Edwards: My great pleasure to be part of this conversation!

Jessica: So Jon, can you first tell us, why are you traveling to the Arctic to map the seafloor?

Jonathan: Well, Jessica we have been collaborating with Canada for the past 3 years to map and define the outer limits of our continental shelf in the Arctic Ocean. This will ultimately define our sovereign rights over the natural resources of the seabed and the sub-sea floor. As you have previously mentioned, these rights include control over the development and preservation of minerals, petroleum, and the sedentary organisms such as clams and crabs and coral that may inhabit the sea floor.

Jessica: And Brian, can you tell us a little bit more about the expedition plans and when you will set sail?

Brian: Our team will be leaving from Dutch Harbor, Alaska, which is out on the Aleutian chain, on August the 2nd aboard the United States Coast Guard Cutter Healy. We will be transiting north, it will take about 5 days to get through the Bering Strait, and then to meet up with the Canadian Coast Guard Cutter, the Louis S. St. Laurent somewhere off shore of Prudhoe Bay in Alaska. The Louis is sailing from Kugluktuk in the First Nation State of Nunavut, Canada. And after we meet, in the offshore we will transfer some personnel, and then we will begin collecting data which will take approximately 4 weeks to complete the mission.

Jessica: So Debbie, donít we already know the limits of our continental shelf? Why are you conducting this research?

Debbie: Well, according to the United Nations Convention on the Law of the Sea, every coastal nation automatically receives a continental shelf out to 200 nautical miles or to a maritime boundary. The Convention also states that a nation is entitled to additional continental shelf if it meets certain criteria. That portion of the continental shelf beyond 200 nautical miles is commonly known as the "extended continental shelf."

In this upcoming expedition, we are collecting data that will help us determine if we meet those criteria and can define an extended continental shelf beyond 200 nautical miles. We donít know that now.

Jessica: And why are we working with Canada on this expedition? What is the benefit of the joint effort?

Debbie: Well, we are working with Canada because the extended continental shelf of each of our countries overlaps. Imagine going north from Alaska and west from the Canadian Arctic Islands. And there is a big overlap in the Canada Basin portion of the Arctic Ocean. It makes sense for us to work together in these remote and challenging environments, and it makes sense to work with the same data sets.


So Jon, how long has the U.S. been conducting research in the Arctic so far?

Jonathan: This is the 3rd year of our two ice breaker work with Canada. We started in 2008. Before that, the U.S. was independently collecting data with the U.S. ice breaker Healy in the Arctic starting back in 2003 to address extended continental shelf requirements.

Jessica: And Jon, how much longer will it take to collect the data necessary to determine if we are entitled to an extended continental shelf? What plans do you have for future research?

Jon: 2010 is our last year working in the Canada Basin North of Alaska. In 2011 we will move further north to collect data together with Canada in the area far north of the Canada basin around a sea floor feature called the Alpha Ridge. The entire United States extended continental shelf program will probably last another 8 or more years, and will cover most of the U.S. continental and island margins.

Jessica: Jon, is the Arctic the only area where the U.S. may have an extended continental shelf? If there are other places, have we started mapping those areas yet?

Jonathan: The U.S. has an extended continental shelf on most of its coastal margins. A federal interagency task force has identified areas in the Bering Sea, the Gulf of Mexico, the Atlantic Coast, and the Western Pacific, where an extended continental shelf can almost certainly be identified as it is in the Arctic. There are several other areas in the Pacific that are less certain, and we have much more work, yet, there to do.

Jessica: Debbie, So whatís it like working in such a cold environment? Do you ever run into difficulties or challenges while working in these ice conditions?

Debbie: Well, I spent the last two summers in the ice, and modern ice breakers like Healy and Louis have all the modern conveniences and creature comforts one might want, maybe, except good internet. But the cold is extremely hard on parts of our gear that are exposed on deck of the ship or that are operating in the very cold, almost freezing water. In 2008 we had several instances where one ice breaker had to help free the other from being stuck in the ice. In another instance, Louis had to shut down all power for electrical repairs. I think it was after about 2 hours, everybody was putting on more layers of clothes to stay warm inside. It cools down pretty quickly. Working in these remote, cold environments requires constant vigilance and care.

Jessica: Brian, what types of data are you collecting on Healy, and can you give us an overview of some of the research instruments and techniques you are using?

Brian: Sure, I would be happy to do that. We will be collecting two primary types of data, one will be making detailed measurements of the depth of the sea floor. We refer to that as high resolution bathymetry. The Healy has a very sophisticated echo sounder system which emits a sound pulse, or ping, into the water that transmits through the water column and then bounces off of the sea floor, and that energy is returned back to the ship as an acoustic wave. The time it takes for that echo to move from the ship to the seafloor and back to the ship is recorded very accurately and is used to calculate the seafloor depth. The second set of samples, or data we are collecting is recovering physical samples underneath the ship that will be providing insight into the geology, or makeup of the sea floor.

Jessica: And Jon, what about research on the Canadian ship? Can you tell us about that?

Jonathan: The Canadian ship, the Louis S. St. Laurent provides a multichannel seismic reflection system. This sound system helps image the sediments and geologic structure of the sub sea floor.

Jessica: Debbie, who else is involved in this research and what exactly, is the USGS role?

Debbie: The U.S. effort in this expedition is being coordinated by the U.S. Extended Continental Shelf Task Force. This is an interagency group chaired by the U.S. Department of State. The USGS is the lead science agency for the U.S. in this yearís expedition and has held either the lead or assistant roles in the past years.

NOAA sometimes also leads and assists in the US data collection efforts. Our Canadian colleagues come from Natural Resources Canada, the Department of Fisheries and Oceans, the Department of Foreign Affairs and International Trade, and of course, the Canadian Coast Guard.

Jessica: Thank you all for joining us today, and thank you to all of our listeners.

You can learn more about this mission and get a glimpse of life in the Arctic by visiting There you can find background materials, follow a near real-time blog authored by those onboard the upcoming mission, view photographs and video, and more!

CoreCast is a product of the U.S. Geological Survey, Department of the Interior.


Title: U.S. - Canada Arctic Expedition Surveying the Extended Continental Shelf


American and Canadian scientists head north on a collaborative expedition 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.

Location: Arctic Ocean

Date Taken: 7/26/2010

Length: 8:32

Note: This video has been released into the public domain by the U.S. Geological Survey for use in its entirety. Some videos may contain pieces of copyrighted material. If you wish to use a portion of the video for any purpose, other than for resharing/reposting the video in its entirety, please contact the Video Producer/Videographer listed with this video. Please refer to the USGS Copyright section for how to credit this video.

Additional Video Credits:
Jessica Robertson, Don Becker, Deborah Hutchinson, PK Cascio, Larry Mayer (University of New Hampshire)


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