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新世纪的“海底革命”

所属:听力板块 来源:voa 阅读:3115 次 评论:0 条 [我要评论]  [+我要收藏]

小编摘要:今年四月份,在美国西北部太平洋发生了一次大型的火山爆发。当然,如果你不幸错过了这一奇景,这也不足为奇,许许多多的人都是如此。

 Undersea Cable Could Revolutionize Oceanography

This past April, there was a big volcanic eruption in America’s Pacific Northwest. If you missed it, you're not alone.
It happened under the ocean off the northern Oregon coast. Since then, several research ships have sent unmanned submersibles down into the undersea crater to videotape lava flows and spewing vents.

In a few years, you should be able to watch such events live on the Internet 24/7. Thanks to a new underwater fiber optic cable, a potentially revolutionary new worldwide ocean observatory is now under construction.

Bringing the ocean to you

"This is a big deal. This is suddenly the ocean is going to be accessible to people. We can't take them all out there deep in the ocean, but we can bring the ocean to them," that's University of Washington oceanography professor John Delaney describing his baby of very expensive and ambitious high-tech baby.

Delaney is one of the driving force behind an effort to wire the Pacific Ocean off the Oregon and Washington coasts for science. Delaney says the vision for this cable and instrument array dates back 20 years.


Delaney recalls bemoaning the expense and difficulty of gathering data in the deep ocean. Then the conversation turned to new undersea fiber optic cables.

"Bingo! We said, 'Let's do something about this, and that was a long time ago."

Undersea network

Now the vision is becoming a reality. A commercial cable-laying ship has just finished spooling out 900 kilometers of fiber optic cable. One strand starts from Pacific City, Oregon, goes out to the edge of the continental shelf and then loops down toward Newport, Oregon.

Another line heads far out to sea to an underwater volcano. Separately, scientists on the U.S. East Coast are anchoring test buoys for another advanced instrument network. This array off New England, will be connected to shore by satellite and wireless links.

Scientists plan to attach dozens of instruments to the cables and buoys. Seismometers could give us a better idea about the offshore earthquake threat. Other sensors will track fish migration, ocean acidification, weather trends, and dissolved oxygen, just to name a few. Underwater microphones could capture whale calls, like these hard-to-find blue whales recorded earlier.

Real-time Internet data

John Delaney says the undersea network is designed to funnel a fire hose of open source, real-time data to the Internet, 24/7.

"So people that are interested - and I'm hoping it will be a growing number of people be innocent - will have the ability to tap into what we're doing. They'll be able to watch over our shoulders electronically as we discover things, as we make mistakes."

One of the cool things to eavesdrop on might be an undersea volcano called the Axial Seamount. It is 480 kilometers out in the ocean due west of Astoria, Oregon. In August, Delaney steamed out there with co-chief scientist Debbie Kelley. They scouted hydrothermal vents to wire up.

"Many people now think the volcanoes on the seafloor are where life originated on the planet. So one of the things we're going to see later on the dive are these vents called snowblower vents, which is where there is warm water issuing out of the seafloor at about 30 degrees Centigrade. With it, it is entraining novel microorganisms."

Monitoring ocean trends

This summer, Oregon State University scientists and engineers are also on the water. They’re testing instrument packages and buoys that will connect in part to the fiber optic network. OSU's Bob Collier says it's fair to say the data array will revolutionize oceanography.

"We really with this cable are able to provide a whole new way of looking at the ocean, which we honestly have never had before."

The West Coast instrument network falls under the umbrella of a larger project with locations in other oceans. It's called the Ocean Observatories Initiative. In addition to the buoy network under development along the U.S. East Coast, four additional sensor packages will be set up on moorings in the far northern and southern oceans.

Those remote, high-latitude instruments are designed to monitor ocean trends on a planetary scale.

U.S. taxpayers are footing the entire $400 million construction bill on the project through the National Science Foundation. The global network is supposed to be in full service in 2014.

标签:voa special
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2011-09-21 17:53 编辑:pliny
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